Loading…
About Thumbnails Sheet
Thumbnails Sheet — free, private, browser-based video tool
Build a sprite sheet — every key moment of your video on one image. It takes video and gives you JPEG. It runs in your browser, so the file is processed on your own device.
Why use Thumbnails Sheet
- ·Files stay on your device — nothing is uploaded
- ·No signup needed
- ·Works in any modern browser, on any OS
- ·Free daily use; Pro removes limits and watermarks
How to use it
- 1Drop a video file on the page, or click to choose one.
- 2Pick the options you want.
- 3Download the JPEG file.
What Thumbnails Sheet does
Build a sprite sheet — every key moment of your video on one image. The result is a JPEG file you download directly.
How it works
Hybrid renderer: WebGL2 for color grading and effects, WebCodecs for decode/encode, ffmpeg.wasm for muxing and exotic codecs. Multi-threaded via SharedArrayBuffer where COOP/COEP is available. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.
Frequently asked questions
Does Thumbnails Sheet upload my files?+
No. Thumbnails Sheet runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is Thumbnails Sheet free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.
Related video tools
Video Info
See dimensions, duration, aspect ratio, and audio status — at a glance.
Video Poster
Save the first frame as a perfect cover image — PNG or JPG.
Video Thumbnail
Grab a frame at any moment — scrub the timeline and save it.
Extract Frames
Pull frames from any video and download them as a ZIP.
Video → GIF
Turn a clip into an animated GIF — pick the range, frame rate, and size.
Mute Video
Strip the audio track — keep the video, lose the sound.