Every 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 the 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.
Open the Stream Asset Sizer and follow the settings and checks below.
Supported slots
| Setting | What it means |
|---|---|
| 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 |
How to use it
- Choose what you are making.
- Add your image.
- Resize, download, and preview on both mobile and desktop before committing.
A practical quality check
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.
Common 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.
Useful next tools
- Emote Resizer — Resize to Discord and Twitch emote limits.
- Thumbnail Maker — Resize and crop to YouTube, blog and square thumbnail sizes.
- Social Media Image — Crop images to Instagram, Facebook, X and LinkedIn sizes.
- Resize Image — Resize to exact pixels or a percentage.
Vootkit provides a browser tool and educational guidance, not a guarantee that every browser, device or third-party platform will accept every file. Platform specifications can change, so verify important publishing requirements with the destination service.
Try the tools from this guide
Keep reading
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.
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.
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.