Turn MP4 files into WebP
Pick the moments you want out of your MP4 and save them as WebP stills. MP4 is the video file that plays everywhere: phones, TVs, browsers, editors and every social platform. Your file never leaves your computer.
Need the other direction? Convert WebP to MP4
How to convert MP4 to WebP
- 1 Drop your MP4 .mp4 file onto the page, or click to browse for it.
- 2 Pick a single moment, or take a picture every few seconds.
- 3 Convert. The work happens on your own machine, so how long it takes depends on your computer and the file.
- 4 Download the WebP, or add more files and do the whole set in one go.
Why convert MP4 to WebP
- Substantially smaller than JPEG and PNG at matching quality.
- One format covers photos, flat graphics, transparency and animation.
- Web images where page weight is a ranking and conversion factor.
- MP4: playing and distributing it carries patent licensing obligations.
MP4 compared with WebP
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | MP4 | WebP |
|---|---|---|
| File extension | .mp4 | .webp |
| Compression | Lossy | Lossy or lossless |
| Transparency | No | Yes |
| Animation | No | Yes |
| Typical file size | Smaller | Depends on mode |
| Introduced | 2001 | 2010 |
| Developed by | ISO/IEC MPEG |
Quality and what changes
WebP stores the same content under a different set of rules, so what matters here is compatibility rather than picture quality. Convert once from the best source you have rather than through a chain of intermediate files.
- One WebP limitation to keep in mind: very large images have to be scaled down before they will save.
Questions about MP4 to WebP
Is there a maximum size for WebP?
Yes, WebP is limited to 16383 x 16383 pixels. Images beyond that have to be scaled down or split before they can be written, which is a property of the format rather than of this tool.
Is my MP4 file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your MP4 is read straight from your own disk, converted on your machine and handed back as a WebP. Nothing is sent anywhere, nothing is stored and there is no account.
Is there a file size limit?
There is no server-side limit because no server sees the file. The real ceiling is your device memory, since the input and the output both have to fit in the tab. A few hundred megabytes is usually fine on a desktop machine and considerably less on a phone.
Can I convert several MP4 files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate WebP downloads or as a single ZIP. Speed depends on your own processor rather than on a queue.
Does the converter work offline?
Yes, after the page has loaded once. The engine is cached by the browser, so you can disconnect, reload and keep converting. That falls out of doing the work locally rather than being a separate mode you switch on.