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How to Reduce PDF File Size Without Ruining It
Learn why scanned PDFs shrink more than text PDFs, what compression changes, and how to reduce file size without making text unreadable.
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Practical answers, careful calculations and step-by-step help for the work you need to finish.
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Images
Which Image Format Should I Use? A Decision Guide
You have a specific file and a specific place it needs to go. This is the format to convert it to, and why — with the converter for each case.
Finance
The Interest Rate Trap: Why 3.3% Costs €1,845 on One Loan and €152,086 on Another
See how the same interest-rate difference changes total cost across a car loan, personal loan and mortgage of different sizes and terms.
Video
How to Compress a Video for Discord (Without It Looking Terrible)
Discord's upload limits, the maths behind hitting them, and which settings to cut first so your clip still looks sharp. Runs in your browser — nothing uploaded.
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All guides
212 guides written to help you get a dependable result.
Accessibility
Six Accessibility Checks to Run Before Publishing a Web Page
Check contrast, colour, headings, alt text and captions, then test the interactions that automated accessibility tools cannot judge.
Audio
Record, Trim and Convert Audio Without Format Surprises
Prepare a voice clip with Vootkit, understand WAV and MP3 exports, and check browser recording and speech-recognition limits.
Business
From Proposal to Paid Receipt: Organise a Small Client Project
Keep scope, estimates, invoices and payment records consistent with a practical Vootkit document workflow for freelancers.
Tools
How to Choose the Right Vootkit Tool for Your Task
Find the right starting tool across Vootkit's categories, understand processing limits and follow a practical guide through to a checked result.
Design
Build a Consistent Colour Palette, Gradient and Shadow in CSS
Choose colours by interface role, convert values, create gradients and shadows, and check the finished design in context.
Data
Inspect a CSV, Convert It to JSON and Create a Reliable Chart
Check headers, quoting and numeric values before converting CSV or JSON and exporting a chart from Vootkit.
Developer
A Browser Debugging Workflow for JSON, Tokens, Encodings and Code
Choose the right developer utility, protect sample data and distinguish formatting, decoding and syntax checks from real validation.
Text
Edit, Count and Compare Writing Without Losing Meaning
A practical editing workflow for word limits, case conversion, line cleanup, readability checks and Markdown exports.
Health
How to Read Health and Fitness Calculators Without Overinterpreting Them
Understand inputs, units and assumptions behind BMI, energy, macro, body-measurement, hydration, pace and heart-rate estimates.
Images
Prepare Website and Social Images Without Repeated Quality Loss
Crop, resize, choose a format and compress images in a deliberate sequence, then verify the exported dimensions and appearance.
PDF
Prepare a PDF Document Pack From Mixed Files, Step by Step
Convert, organise, merge and check a PDF pack while preserving originals, readable pages and the receiving portal's requirements.
Privacy
Prepare Files, Screenshots and Links for Safer Sharing
Remove unnecessary personal details, clean tracking links and check encrypted text without confusing privacy tools with guarantees.
Education
Build a Study Workflow With Flashcards, Quizzes and a Realistic Plan
Turn course notes into focused practice, track study sessions, check citations and back up browser-saved learning material.
Video
Prepare a Video for Upload: Trim, Reframe, Compress and Check
Build a deliberate video-export workflow around the destination's size, shape and format requirements, with checks for sound and readability.
Business
How to Estimate Amazon FBA Profit Before Ordering Stock
A practical guide to using Vootkit's Amazon FBA Profit Calculator with worked examples, checks, limitations and related tools.
Images
How to Compress Many Images Without Checking Every File Manually
Use Vootkit's Batch Image Compressor with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Calculate Break-Even Units and Revenue
A practical guide to using Vootkit's Break-Even Point with worked examples, checks, limitations and related tools.
Images
How to Resize a Batch of Images Consistently
Use Vootkit's Bulk Image Resizer with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Design a Business Card People Can Actually Use
A practical guide to using Vootkit's Business Card Maker with worked examples, checks, limitations and related tools.
Business
How to Generate and Screen a Business Name
A practical guide to using Vootkit's Business Name Generator with worked examples, checks, limitations and related tools.
Business
How to Compare Customer Acquisition Cost With Lifetime Value
A practical guide to using Vootkit's CAC & LTV Calculator with worked examples, checks, limitations and related tools.
Images
How to Make a Round Profile Picture That Does Not Cut Off Your Face
Use Vootkit's Round Profile Picture with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Build a Balanced Photo Collage Without Random Cropping
Use Vootkit's Collage Maker with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Extract a Practical Colour Palette From an Image
Use Vootkit's Image Palette Extractor with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Compare Two PDF Versions Without Missing Important Changes
Use Vootkit's Compare PDFs with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Draft a Simple Service Contract Without Missing the Basics
A practical guide to using Vootkit's Contract Generator with worked examples, checks, limitations and related tools.
Images
How to Crop an Image to the Right Composition and Aspect Ratio
Use Vootkit's Crop Image with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Crop PDF Page Margins Without Cutting Off Content
Use Vootkit's Crop PDF with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Delete Unwanted Pages From a PDF Safely
Use Vootkit's Delete PDF Pages with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Duplicate PDF Pages for Forms, Labels or Repeated Inserts
Use Vootkit's Duplicate PDF Pages with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Calculate Etsy Fees and Your Real Item Profit
A practical guide to using Vootkit's Etsy Fee & Profit Calculator with worked examples, checks, limitations and related tools.
PDF
How to Convert an Excel Sheet to a Readable PDF
Use Vootkit's Excel to PDF with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Extract Selected Pages Into a New PDF
Use Vootkit's Extract PDF Pages with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Create a Favicon That Remains Recognisable at 16 Pixels
Use Vootkit's Favicon Generator with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Apply Photo Filters Without Destroying Natural Colour
Use Vootkit's Photo Filter Studio with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Flip an Image Horizontally or Vertically
Use Vootkit's Flip Image with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Convert a Colour Photo to Black and White or Sepia
Use Vootkit's Black & White / Sepia with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Convert HEIC Photos for Wider Compatibility
Use Vootkit's HEIC Converter with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Calculate a Sustainable Freelance Hourly Rate
A practical guide to using Vootkit's Hourly Rate Calculator with worked examples, checks, limitations and related tools.
PDF
How to Convert HTML to PDF Without Broken Layouts
Use Vootkit's HTML to PDF with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Blur Part or All of an Image for a Clear Purpose
Use Vootkit's Image Blur Tool with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Adjust Image Brightness and Contrast Without Clipping Detail
Use Vootkit's Brightness & Contrast with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Sharpen an Image Without Creating Halos
Use Vootkit's Image Sharpener with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Extract Text From an Image With OCR and Verify It
Use Vootkit's Image to Text (OCR) with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Watermark Photos Without Making Them Unusable
Use Vootkit's Image Watermark with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Set Up a Simple Inventory Tracker That Prevents Stock Surprises
A practical guide to using Vootkit's Inventory Tracker with worked examples, checks, limitations and related tools.
Images
How to Convert JPG to PNG and Know What Will Not Improve
Use Vootkit's JPG to PNG with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Convert JPG to WebP for Smaller Web Images
Use Vootkit's JPG to WebP with a worked example, quality checks, privacy guidance and the right related tools.
SEO
How to Use Keyword Density Without Writing for a Percentage
A practical guide to using Vootkit's Keyword Density with worked examples, checks, limitations and related tools.
Business
How to Plan a Focused Landing Page Before You Publish
A practical guide to using Vootkit's Landing Page Generator with worked examples, checks, limitations and related tools.
Business
How to Calculate a Fair Late Fee and State It Clearly
A practical guide to using Vootkit's Late Fee Calculator with worked examples, checks, limitations and related tools.
PDF
How to Convert Markdown to a Well-Structured PDF
Use Vootkit's Markdown to PDF with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Make a Readable Meme Without Hiding the Image
Use Vootkit's Meme Generator with a worked example, quality checks, privacy guidance and the right related tools.
SEO
How to Write Better Title Tags and Meta Descriptions
A practical guide to using Vootkit's Meta Tag Generator with worked examples, checks, limitations and related tools.
SEO
How to Control How a Page Looks When Shared on Social Media
A practical guide to using Vootkit's Social Share Preview with worked examples, checks, limitations and related tools.
Images
How to Prepare a Passport Photo Without Assuming It Will Be Accepted
Use Vootkit's Passport Photo Maker with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Estimate PayPal Fees and Gross Up an Invoice
A practical guide to using Vootkit's PayPal Fee Calculator with worked examples, checks, limitations and related tools.
PDF
How to Create a PDF From Text and Images in the Browser
Use Vootkit's PDF Creator with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Fill a PDF Form Without Missing Required Fields
Use Vootkit's PDF Form Filler with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Extract Text From a Scanned PDF With OCR
Extract and check text from scanned PDFs or images, choose a supported language and understand the 20-page limit and plain-text output.
PDF
How to Add Page Numbers to a PDF in the Right Position
Use Vootkit's Add Page Numbers with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Redact Sensitive Information From a PDF Properly
Use Vootkit's Redact PDF with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Repair a Damaged PDF and Check What Survived
Use Vootkit's Repair PDF with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Add a Visible Signature to a PDF Responsibly
Use Vootkit's Sign PDF with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Convert PDF Pages to JPG Images at Useful Quality
Use Vootkit's PDF to JPG with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Convert PDF Pages to PNG for Crisp Screenshots
Use Vootkit's PDF to PNG with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Extract Selectable Text From a PDF
Use Vootkit's PDF Text Extractor with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Convert PDF Pages to WebP for Faster Web Previews
Use Vootkit's PDF to WebP with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Add a Readable Watermark to PDF Pages
Use Vootkit's PDF Watermark with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Convert PNG to JPG Without an Unexpected Background
Use Vootkit's PNG to JPG with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Combine PNG Images Into a PDF Without Losing Sharp Edges
Use Vootkit's PNG to PDF with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Convert PNG to WebP While Preserving Transparency
Use Vootkit's PNG to WebP with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Calculate Profit Margin, Markup and Selling Price Correctly
A practical guide to using Vootkit's Profit Margin with worked examples, checks, limitations and related tools.
Business
How to Write a Project Proposal That Is Easy to Evaluate
A practical guide to using Vootkit's Proposal Generator with worked examples, checks, limitations and related tools.
Business
How to Create a QR Business Card That Saves Contact Details
A practical guide to using Vootkit's QR Business Card (vCard) with worked examples, checks, limitations and related tools.
Business
How to Create a Professional Quote That Clients Can Approve
A practical guide to using Vootkit's Quote & Estimate with worked examples, checks, limitations and related tools.
Business
How to Make a Clear Receipt for a Completed Payment
A practical guide to using Vootkit's Receipt Generator with worked examples, checks, limitations and related tools.
PDF
How to Remove a PDF Password From a File You Are Allowed to Edit
Use Vootkit's Remove PDF Password with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Reorder PDF Pages Without Losing Track of the Sequence
Use Vootkit's Organise PDF Pages with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Build a Resume That Recruiters Can Scan Quickly
A practical guide to using Vootkit's Resume / CV Builder with worked examples, checks, limitations and related tools.
Business
How to Calculate ROAS Without Confusing Revenue With Profit
A practical guide to using Vootkit's ROAS Calculator with worked examples, checks, limitations and related tools.
SEO
How to Create a robots.txt File Without Hiding Important Pages
A practical guide to using Vootkit's robots.txt Generator with worked examples, checks, limitations and related tools.
Images
How to Rotate a Photo Without Leaving It Sideways
Use Vootkit's Rotate Image with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Rotate PDF Pages and Save the Correct Orientation
Use Vootkit's Rotate PDF with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Add Rounded Corners to an Image Cleanly
Use Vootkit's Rounded Corners with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Scan Paper Documents Into a Clear, Searchable PDF Workflow
Use Vootkit's Scan to PDF with a worked example, quality checks, privacy guidance and the right related tools.
SEO
How to Generate JSON-LD Schema Without Creating False Claims
A practical guide to using Vootkit's Schema Markup Generator with worked examples, checks, limitations and related tools.
SEO
How to Preview a Google Search Snippet Before Publishing
A practical guide to using Vootkit's SERP Snippet Preview with worked examples, checks, limitations and related tools.
SEO
How to Build a Clean XML Sitemap Search Engines Can Trust
A practical guide to using Vootkit's Sitemap Generator with worked examples, checks, limitations and related tools.
SEO
How to Create Short, Stable and Search-Friendly URL Slugs
A practical guide to using Vootkit's URL Slug Generator with worked examples, checks, limitations and related tools.
Images
How to Resize Social Media Images Without Awkward Crops
Use Vootkit's Social Media Image Sizer with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Work Out Stripe Fees and the Amount You Receive
A practical guide to using Vootkit's Stripe Fee Calculator with worked examples, checks, limitations and related tools.
Images
How to Convert SVG to PNG at the Right Resolution
Use Vootkit's SVG to PNG with a worked example, quality checks, privacy guidance and the right related tools.
Business
How to Run a SWOT Analysis That Leads to Decisions
A practical guide to using Vootkit's SWOT Analysis Maker with worked examples, checks, limitations and related tools.
PDF
How to Turn Plain Text Into a Clean PDF Document
Use Vootkit's Text to PDF with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Design a Thumbnail That Still Works When It Is Small
Use Vootkit's Thumbnail Maker with a worked example, quality checks, privacy guidance and the right related tools.
SEO
How to Shorten and Share a Link Without Losing Trust
A practical guide to using Vootkit's URL Shortener with worked examples, checks, limitations and related tools.
SEO
How to Build UTM Links That Produce Clean Campaign Reports
A practical guide to using Vootkit's UTM Link Builder with worked examples, checks, limitations and related tools.
Business
How to Add or Remove VAT and GST From a Price
A practical guide to using Vootkit's VAT / GST Calculator with worked examples, checks, limitations and related tools.
Images
How to Convert WebP to JPG for Universal Photo Compatibility
Use Vootkit's WebP to JPG with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Convert WebP Images Into an Ordered PDF
Use Vootkit's WebP to PDF with a worked example, quality checks, privacy guidance and the right related tools.
Images
How to Convert WebP to PNG for Editing or Compatibility
Use Vootkit's WebP to PNG with a worked example, quality checks, privacy guidance and the right related tools.
PDF
How to Convert a Word Document to PDF and Check the Result
Use Vootkit's Word to PDF with a worked example, quality checks, privacy guidance and the right related tools.
Everyday
How to Calculate Exact Age and Date Difference
Gives the gap between two dates as years, months and days, and also as a total in days, weeks and hours.
Everyday
How to Convert Square Metres, Feet, Acres and Hectares
Converts between metric and imperial area units using exact squared factors. A square foot is 0.09290304 m² — which is 0.3048 squared, not 0.3048.
Insurance
How to Estimate Car Insurance Cover Before Comparing Quotes
Helps size liability cover against what you could actually lose in a claim, defaulting to 120,000 in assets and 65,000 income.
Everyday
How to Generate a Barcode That Works
Generates a scannable barcode in CODE128, EAN-13, UPC-A or CODE39 from whatever value you enter.
Real Estate
How to Calculate Capitalisation Rate on a Rental Property
Divides net operating income by property value. NOI is rental income minus operating expenses, and explicitly excludes mortgage payments — that exclusion…
Real Estate
How to Calculate Cash-on-Cash Return for Property
Divides annual pre-tax cash flow by the cash you actually put in — deposit, closing costs and any initial works — rather than by the property price.
Real Estate
How to Estimate Home-Buying Closing Costs
Estimates the one-off costs of completing a purchase from percentages you set, defaulting to 1.5% and 0.75% components against a 350,000 price.
Everyday
How to Create an Accurate Countdown for Any Event
Counts down to any date and time you pick, updating every second, in days, hours, minutes and seconds.
Everyday
How to Convert KB, MB, GB and Data Units
Converts storage and bandwidth units using binary multiples of 1024 — the convention operating systems use, where a kilobyte is 1024 bytes and a gigabyte…
Everyday
How to Add, Subtract and Compare Calendar Dates
Finds the number of days between two dates, and adds or subtracts a period from a date to give the resulting one.
Everyday
How to Calculate Discounts, Coupons and Final Prices
Works out what you actually pay after a discount, an optional stacked coupon and sales tax.
Travel
How to Estimate Travel Time from Distance and Speed
Calculates travel time from a distance and an average speed, in kilometres or miles.
Everyday
How to Estimate the Electricity Cost of Any Appliance
Multiplies watts by hours by days, converts to kilowatt-hours and multiplies by your tariff, giving the cost of running one appliance over a period.
Tax
How to Calculate the True Cost of an Employee
Adds employer-side costs on top of gross salary — payroll taxes, pension contributions and benefits — to give the real annual cost of employing someone.
Everyday
How to Solve Linear and Quadratic Equations
Solves ax² + bx + c = 0 for x, giving both roots along with the discriminant that determines what kind of roots they are.
Everyday
How to Add, Subtract, Multiply and Divide Fractions
Adds, subtracts, multiplies and divides two fractions, returning the result in lowest terms.
Travel
How to Calculate the Fuel Cost of a Journey
Multiplies distance by consumption by price. Handles both conventions — L/100km (lower is better) and MPG (higher is better) — which is the detail that…
Travel
How to Convert MPG and Litres per 100 Kilometres
Converts between MPG (US), MPG (UK), L/100km and km/L. US and UK MPG are not the same figure, because the gallons differ: 30 MPG US is about 36 MPG UK for…
Real Estate
How Much House Can You Actually Afford?
Estimates the property price your income supports, from your deposit, existing debt payments and a debt-to-income limit.
Tax
How to Calculate Your Real Hourly Wage
Multiplies an hourly rate by hours per week and weeks per year to give weekly, monthly and annual gross pay.
Insurance
How Much Income Protection Cover Do You Need?
Compares essential monthly outgoings against take-home pay and any employer sick pay, to show the shortfall a policy would need to cover. Defaults to…
Tax
How to Estimate Income Tax Without Confusing Tax Bands
Applies a tax-free allowance and then bands you define, so only the income inside each band is taxed at that band’s rate. Earning one pound into a 40%…
Everyday
How to Convert Length and Distance Units
Converts between metric, imperial and nautical units using the exact defined factors rather than the approximations. A mile is exactly 1609.344 m, a yard…
Insurance
How Much Life Insurance Cover Does Your Family Need?
Estimates a cover amount from income to replace, years to replace it for, and debts to clear. Defaults to 65,000 income over 10 years.
Everyday
How to Solve Everyday Arithmetic Step by Step
Evaluates a whole expression at once — brackets, powers, multiplication, division, addition and subtraction — with standard precedence.
Travel
How to Calculate Mileage Reimbursement Correctly
Multiplies distance by a per-unit rate. Defaults to 0.67, which reflects a recent published business rate.
Real Estate
How to Calculate a Mortgage Payment and Total Interest
Calculates the monthly payment on a mortgage, and adds property tax and home insurance so the figure resembles what actually leaves your account.
Real Estate
How Extra Payments Change Your Mortgage Payoff Date
Shows how extra payments shorten the term and reduce total interest, from a 240,000 balance at 6.5% by default.
Tax
How to Calculate Overtime Pay Correctly
Splits total hours into normal and overtime at the threshold you set, then pays the overtime portion at your multiplier — 1.5× (\"time and a half\") is the…
Travel
How to Build a Packing List You Will Actually Use
Builds a checklist you can work through and tick off, so the same forgotten item does not repeat trip after trip.
Tax
How to Estimate Your Take-Home Pay from Gross Salary
Estimates take-home pay from a gross salary after tax, social contributions, pension and any other deductions, broken down per pay period.
Tax
How to Estimate Payroll Cost for a Team
Subtracts income tax and pension contributions from gross salary to estimate take-home, with the rates you supply.
Everyday
How to Calculate Percentages Without Mixing Up the Formula
Handles the three percentage questions people actually ask: what is A% of B, A is what percent of B, and what is the percentage change from A to B.
Everyday
How to Use a Pomodoro Timer Without Breaking Your Focus
Runs alternating work and break intervals with the lengths you set, defaulting to the classic 25 and 5.
Tax
How to Calculate PTO and Holiday Accrual
Works out how much paid leave you have accrued so far this year, pro-rated by months worked, and subtracts what you have already taken.
Everyday
How to Create a QR Code That Scans Reliably
Turns any text or URL into a QR code PNG at one of three sizes and four error-correction levels.
Everyday
How to Scan a QR Code Safely in Your Browser
Decodes a QR code from an image file or your camera and shows you the raw contents as text.
Everyday
How to Generate Random Numbers for Draws and Tests
Generates numbers in a range you set, one or many, with an option to make every result unique.
Everyday
How to Pick a Random Name Fairly
Picks one or several options at random from a list you paste in, with an option to avoid repeats.
Real Estate
How to Calculate Whether Refinancing Will Save Money
Compares your current loan against a new one and works out how many months it takes for the savings to cover the refinancing costs.
Real Estate
Renting vs Buying: How to Compare the Real Long-Term Cost
Compares the cost of renting against buying over time, using a 350,000 property with a 70,000 deposit by default.
Real Estate
How to Calculate Gross and Net Rental Yield
Calculates both gross yield — annual rent divided by price — and net yield, which subtracts running costs and allows for vacancy.
Tax
How to Convert Annual Salary into Hourly, Weekly and Monthly Pay
Converts a wage between hourly, daily, weekly, monthly and annual, so two offers quoted differently can be compared directly.
Tax
How to Estimate Self-Employment Tax and Set Money Aside
Calculates self-employment tax at 15.3% — which is 12.4% social security plus 2.9% Medicare, both halves — and applies the standard 92.35% adjustment to…
Everyday
How to Convert Speed Units Correctly
Converts between m/s, km/h, mph, knots and ft/s using exact factors relative to metres per second.
Everyday
How to Time Tasks, Laps and Events Accurately
Times elapsed duration to a hundredth of a second, with lap splits recorded as you go.
Everyday
How to Convert Celsius, Fahrenheit and Kelvin
Converts between Celsius, Fahrenheit and Kelvin. Because the scales are offset, each conversion needs both a factor and an addition: °F = °C × 9/5 + 32…
Everyday
How to Add and Subtract Hours and Minutes
Adds and subtracts durations in hours, minutes and seconds, carrying correctly at sixty rather than a hundred.
Everyday
How to Convert Meeting Times Between Time Zones
Converts a specific date and time between timezones using the IANA timezone database built into your browser.
Travel
How Much Should You Tip in Different Countries?
Suggests a tip for a given bill in nine countries: the US, Canada, UK, Germany, France, Italy, Spain, Australia and Japan.
Everyday
How to Split a Restaurant Bill and Tip Fairly
Works out the tip, the total and what each person owes, with an option to round each share up so the collected amount actually covers the bill.
Travel
How to Split a Group Trip Cost Fairly
Divides a total across a group and shows the per-person share, defaulting to 1,200 split four ways.
Everyday
How to Test and Improve Your Typing Speed
Times you against a sample passage and reports words per minute alongside accuracy.
Everyday
How to Convert Measurement Units Accurately
Converts within Length, Mass, Area, Volume, Speed, Data and Time, plus Temperature, which is handled separately because it does not scale from zero.
Everyday
How to Convert Volume and Capacity Units
Converts between metric and US customary volumes, and includes the UK gallon separately at 4.54609 L against the US gallon’s 3.785411784 L.
Everyday
How to Convert Weight and Mass Units
Converts between metric and imperial mass units using exact factors. A pound is exactly 0.45359237 kg, defined by the same 1959 agreement that fixed the inch.
Video
How to Increase or Reduce Video Volume Safely
Multiplies the audio by the percentage you choose and copies the video through untouched (-c:v copy). Only the sound is re-encoded, so the picture is…
Video
How to Choose the Right Streaming Bitrate for OBS
Takes a target file size and a duration and returns the video bitrate that lands inside it, after subtracting the audio track and container overhead.
Video
How to Create a BRB Screen and Countdown Overlay
Creates a \"be right back\" card to switch to during a break — sized for a stream canvas and ready as an OBS source.
Video
How to Style a Stream Chat Overlay With CSS
Creates a styled chat overlay to add as a browser source in OBS, so messages appear on the stream itself.
Video
How to Convert Video Formats Without Guessing the Settings
Converts almost any video container to MP4 with H.264 video and AAC audio, at a frame rate you choose.
Video
How to Resize Emotes and Stickers Without Losing Clarity
Resizes a single image into the exact set of sizes a platform requires, in one pass — because you need all of them, not one.
Video
How to Extract Audio From a Video in Your Browser
Discards the video stream and writes the audio to its own file. MP3 uses LAME at quality level 2, a variable bitrate that averages roughly 190 kbps —…
Video
How to Extract a High-Quality Still Frame From a Video
Seeks to the second you specify, draws that frame to a canvas and saves it as a PNG. This is the only video tool here that does not use ffmpeg — it uses…
Video
How to Pick a Giveaway Winner Fairly and Transparently
Draws a random winner from a list of entrants, on screen, so the selection happens where everyone can see it.
Video
How to Create a Seamless Looping Video
Repeats the clip end to end for the number of plays you choose, using -streamloop with -c copy. The video is never decoded, so a three-times loop of a…
Video
How to Remove Audio From a Video Without Complicated Software
Strips the audio track and copies the video through untouched. The exact command is -c copy -an: no decoding, no re-encoding, no quality loss whatsoever.…
Video
How to Choose OBS Settings for Your Internet and Computer
Works out a safe bitrate from three things: what your resolution and frame rate ideally want, what your platform will accept, and — the one that usually…
Video
How to Resize a Video for Social Media and the Web
Scales the video to a target height and works the width out from the source aspect ratio, so nothing is stretched or cropped. Scaling uses lanczos, which…
Video
How to Make a Starting Soon Screen for Your Stream
Generates a full-screen holding card with your text, sized for a stream canvas, ready to add as a browser or image source in OBS.
Video
How to Create Stream Alerts That Stay Readable
Creates alert graphics for follows, subscriptions, donations and raids, ready to add to your alert system as an image.
Video
How to Prepare Correctly Sized Assets for Twitch and Streaming
Resizes an image to the exact dimensions a specific platform slot requires — YouTube thumbnails, channel banners and avatars, Twitch banners, avatars…
Video
How to Create a Clean Stream Overlay for OBS
Builds a stream overlay you can add as an OBS source — the frame around your content, including webcam borders and information panels.
Video
How to Estimate Streaming Revenue Without Overestimating It
Adds up subscriptions, bits, donations and ad revenue into a monthly total, so you can see which source is actually carrying you.
Video
How to Build a Streaming Schedule You Can Maintain
Lays out a weekly streaming schedule you can publish on your channel and social accounts, so viewers know when to show up.
Video
How Long Will a Video Upload Take? Calculate It Accurately
Converts a file size and an upload speed into a realistic transfer time, handling the unit conversion that trips everyone up: file sizes are in megabytes…
Video
How to Reframe a Landscape Video for TikTok, Reels and Shorts
Centre-crops the source to the target shape, then scales the result — the filter is crop followed by scale with lanczos. Nothing is stretched: the aspect…
Finance
How to Use the 50/30/20 Budget Without Forcing Every Expense Into It
Split take-home income into needs, wants and savings, classify difficult expenses and adapt the 50/30/20 budget to your real cost of living.
Finance
How to Calculate a Car Payment and Compare Auto Loan Offers
Calculate a realistic car payment by including price, deposit, trade-in and loan terms, then compare the total cost of competing auto finance offers.
Finance
How Compound Interest Grows Savings Over Time
Understand compounding, calculate future value with regular contributions and learn why rate, time, fees and contribution timing change the result.
PDF
How to Convert JPG Images to One PDF in the Right Order
Turn photos or scanned JPG and PNG images into one organized PDF, choose the correct page size and margins, and prevent rotated or blurry results.
Video
How to Convert a Video to GIF Without Creating a Huge File
Choose the right clip length, width and frame rate for a useful animated GIF, then balance motion quality against download size.
Business
How to Create a Professional Invoice Clients Can Understand
Build a clear invoice with accurate line items, discounts, tax, payment terms and numbering, then save a clean PDF for your records.
Finance
How Long Will It Take to Pay Off a Credit Card?
Estimate a credit-card payoff date, see how interest changes the result and test how a fixed extra payment can reduce payoff time and total cost.
Finance
How to Calculate Crypto Profit, Loss and Dollar-Cost Average Entry
Calculate cryptocurrency profit or loss across multiple purchases, find your average entry price and include trading fees before judging performance.
Finance
How Currency Conversion Works: Rates, Spreads and Real Transfer Costs
Use a live currency converter correctly and understand why bank, card and transfer-provider results differ after spreads, fees and rate timing.
Finance
How to Calculate Debt-to-Income Ratio Before Applying for a Loan
Calculate front-end and back-end debt-to-income ratios, identify which monthly payments count and understand how lenders may interpret the result.
Developer
How to Format and Validate JSON Without Exposing Private Data
Pretty-print, validate and minify JSON locally, understand common syntax errors and avoid pasting API keys, tokens or customer data into an online server.
Finance
How to Project Investment Growth Without Treating It as a Promise
Model investment growth with an initial balance and monthly contributions, then stress-test return assumptions, fees, inflation and market uncertainty.
Finance
How to Calculate Loan Payments, Interest and Borrowing Cost
Learn how loan payments are calculated, compare terms and interest rates, and understand total borrowing cost before accepting a personal or business loan.
PDF
How to Merge PDF Files Safely and Keep the Pages in Order
A practical way to combine PDF files in the correct order, check the result, protect sensitive documents and avoid uploading private files to an unknown server.
Security
How to Password-Protect a PDF Before You Share It
Learn what PDF passwords protect, what they cannot prevent, how to choose and transmit a password safely, and how to verify the protected document.
Security
How to Remove Photo Metadata and GPS Details Before Sharing
See what EXIF metadata can reveal, inspect a photo locally, create a clean copy without GPS or camera fields and verify it before posting.
Images
How to Resize Images Without Making Them Blurry or Distorted
Choose the right pixel dimensions, preserve aspect ratio, understand upscaling limits and export a sharp image for websites, documents or social posts.
Finance
How to Build a More Realistic Retirement Projection
Estimate a future retirement balance using age, savings, contributions and returns, then stress-test inflation, fees and uncertain investment performance.
Finance
How Much Should You Save Each Month to Reach a Goal?
Turn a target amount and deadline into a realistic monthly savings plan, account for current savings and test whether your goal needs more time.
Finance
How to Calculate Simple Interest From Principal, Rate and Time
Learn the simple-interest formula, convert time and annual rates correctly, and distinguish simple interest from compound growth and amortised loans.
PDF
How to Split a PDF and Extract Only the Pages You Need
Learn how PDF page ranges work, extract selected pages into a clean new document, avoid numbering mistakes and check the result before sharing it.
Video
How to Trim a Video in Your Browser Without Losing Quality
Cut a precise section from a video, understand keyframe-aware trimming, avoid unnecessary re-encoding and verify the exported MP4.
Tools
File Upload Size Limits (2026)
A practical 2026 reference for Gmail, Outlook, Discord, WhatsApp, Slack, YouTube, Google Drive, OneDrive and Dropbox upload limits.
Finance
APR vs Interest Rate: What Each One Actually Tells You
Learn how APR combines interest and fees, when it gives a fair loan comparison, and why the break-even month can matter more than the headline rate.
Finance
Debt-to-Income Ratio: The Number Your Lender Works Out Before They Look at Anything Else
Understand front-end and back-end debt-to-income ratios, lender thresholds, and which debt payment can most effectively improve affordability.
PDF
How to Reduce PDF File Size Without Ruining It
Learn why scanned PDFs shrink more than text PDFs, what compression changes, and how to reduce file size without making text unreadable.
Images
How to Compress Images Without Losing Quality
Learn why images become large, what compression removes, and which settings reduce file size without causing visible quality loss.
Video
How to Compress a Video for Discord (Without It Looking Terrible)
Discord's upload limits, the maths behind hitting them, and which settings to cut first so your clip still looks sharp. Runs in your browser — nothing uploaded.
Finance
Should You Raise Your Deductible? Do the Arithmetic First
Calculate when a higher insurance deductible pays for itself, then check whether the larger out-of-pocket risk is affordable in practice.
Finance
The Interest Rate Trap: Why 3.3% Costs €1,845 on One Loan and €152,086 on Another
See how the same interest-rate difference changes total cost across a car loan, personal loan and mortgage of different sizes and terms.
Images
Which Image Format Should I Use? A Decision Guide
You have a specific file and a specific place it needs to go. This is the format to convert it to, and why — with the converter for each case.
Updates
Welcome to the Vootkit blog
Guides, tips and product updates for getting the most out of Vootkit's fast, private, browser-based tools.
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Tools2 guidesHow to choose the right Vootkit tool and use it well.→Finance16 guidesPlain-English finance explainers with calculators and examples.→Tax & Pay9 guidesPractical salary, payroll and tax estimates with assumptions and limitations explained.→Real Estate9 guidesMortgage, affordability and property-return guides built around realistic costs and scenarios.→Insurance3 guidesEducational insurance estimates, trade-offs and questions to check before comparing policies.→Everyday28 guidesClear guidance for calculations, conversions, timers, codes and practical daily tasks.→PDF33 guidesCompress, convert, split, merge and clean PDF files without handing them to a server.→Images33 guidesResize, compress and convert images while keeping quality under control.→
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