Upload your .webm file and get a smaller, optimized MP4. Works with WebM files from any source. Free, no account required.
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Drag & drop your .webm video file. We support files up to 500MB. No account needed.
SquishVideo converts and compresses your WebM to optimized MP4 H.264, reducing file size while preserving quality.
Get your compressed MP4 instantly. It's compatible with every platform, device, and browser.
WebM is Google's open video format designed specifically for the web. It uses VP8, VP9, or AV1 codecs — all open and royalty-free alternatives to H.264. WebM files are commonly found on websites, in browser-based screen recorders, and as downloaded videos from platforms like YouTube (via third-party tools).
WebM files tend to be small to medium compared to optimized MP4. Converting from WebM to MP4 H.264 typically reduces file size by 40-80% while maintaining excellent visual quality. The resulting MP4 also plays on every device and platform without compatibility issues.
WebM was developed by Google in 2010. It uses the Matroska-based WebM container and typically contains VP8/VP9/AV1 encoded video. Browser support is chrome, firefox, edge, and mobile support is android native, ios limited. For streaming, WebM offers yes, web-optimized capabilities.
Keep WebM if you're doing professional editing and need the original codec quality. Convert to MP4 when: you need to share the video online, upload to social media, send via email, or reduce storage usage. For 99% of sharing and consumption purposes, MP4 is the better format.
| Feature | WebM | MP4 (H.264) |
|---|---|---|
| Container | Matroska-based WebM | MPEG-4 Part 14 |
| Typical Codec | VP8/VP9/AV1 | H.264 / H.265 |
| File Size | Small to Medium | Optimized (smallest) |
| Browser Support | Chrome, Firefox, Edge | Universal |
| Mobile Support | Android native, iOS limited | Universal |
| Streaming | Yes, web-optimized | Yes, natively |
When you upload a WebM file, SquishVideo first analyzes the video stream to understand its codec, resolution, framerate, and bitrate profile. We then transcode the video to H.264 MP4 using optimized encoding parameters. The entire process preserves audio quality (re-encoded to AAC) and maintains the original resolution unless a lower resolution would provide a better quality-to-size ratio.
WebM files typically come from: web downloads, browser screen recorders, Google Meet recordings, and YouTube downloads.
SquishVideo supports 20+ video formats. Choose your input format:
Need your WebM video to fit a file size limit? Pick a target: