Add the numbers for your scenario.
01Video & Streaming toolVideo or media file
Stream Asset Sizer
Correct sizes for Twitch and YouTube banners, avatars and panels.
100% FreeRuns instantlyNo watermark
- 1Enter detailsAdd the numbers for your scenario.
- 2CalculateVootkit updates the result instantly.
- 3ReviewCheck totals, notes and breakdowns.
Private by designProcessed on your device where possible.
Works on any deviceDesktop, tablet and mobile browsers.
No installationOpen the page and start working.
Always free coreUse the free plan for everyday tasks.
How to use Stream Asset Sizer
Vootkit updates the result instantly.
02Check totals, notes and breakdowns.
03Copy the answer into your workflow.
04Your files stay private
Your work is processed locally in your browser where possible and is never added to a Vootkit upload library.
Learn more about privacyEvery platform wants different dimensions for the same six pieces of channel art, and each publishes them in a different corner of a help centre. Getting one wrong means a banner cropped through your own face.
What Stream Asset Sizer does
Resizes an image to the exact dimensions a specific platform slot requires — YouTube thumbnails, channel banners and avatars, Twitch banners, avatars, info panels, offline screens and emotes.
Pick the destination rather than typing numbers, so there is nothing to look up and nothing to mistype.
Supported slots
| YouTube | Thumbnail, channel banner, profile picture |
|---|---|
| Twitch | Profile banner, profile picture, info panel |
| Twitch | Offline banner, emote |
| Method | Resize to the platform’s exact specification |
| Banners | Have a safe area — see the tip |
| Privacy | Processed in your browser — never uploaded |
| Next step | Compress before uploading if the file is large |
Detailed steps
- Choose what you are making.
- Add your image.
- Resize, download, and preview on both mobile and desktop before committing.
Worth knowing
Channel banners are the one to be careful with. The full image only ever appears on a desktop TV layout; phones crop hard to the centre, and that is where most people will see it. Keep your name and anything essential in the middle third, and treat the outer edges as decoration that may never be seen.
Frequently Asked Questions
Why does my banner look cropped on mobile?
Because it is. Channel banners are displayed at very different aspect ratios across TV, desktop and mobile, and the platform crops to the centre on small screens. Design for the centre and let the edges be scenery.
Does resizing hurt quality?
Scaling down is safe and often sharpens the result. Scaling up is not — always start from an image at least as large as the target.
Should I compress after resizing?
If the file is large, yes. Platforms enforce file size limits as well as dimensions, and a correctly sized banner can still be rejected for weight. Run it through Compress Image afterwards.
Are these dimensions current?
They match the platforms’ published specifications, but platforms do change them occasionally. If an upload is rejected on size, check the current help page — and the tool will be updated.
Is Stream Asset Sizer free?
Yes. The Vootkit free plan includes 5 tool runs a day. Upgrade to Vootkit Pro for unlimited daily use, an ad-free workspace and saved workflows.
Are my files uploaded?
No. Stream Asset Sizer runs entirely in your browser — your file is processed on your own device and never sent to a server. There is nothing for us to store or delete.
Do I need to install anything?
No. Stream Asset Sizer works in any modern browser on desktop, tablet or phone. Open the page and start.
How often can I use it? Is there a daily limit?
On the free plan you get 5 tool runs a day. When you reach the limit you'll see a prompt to upgrade, and it resets the next day. Vootkit Pro removes the cap entirely for unlimited daily use.
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This tool processes everything locally in your browser. You can disconnect from the internet after the page loads and it will still work.