WEBM Compressor
VP9 compression tuned for the smallest web-friendly file.
Drop files, or click to browse
WEBM files only — processed one at a time
Frequently asked questions
What's the difference between quality and resolution here?+
Quality controls how aggressively each frame is compressed; resolution controls the pixel dimensions. Lowering either shrinks the file — combine both for the biggest savings.
Will the output still play everywhere?+
Yes — the WEBM container and codec choice are kept broadly compatible with players and editors.
Is my video uploaded anywhere?+
No, compression runs locally in your browser using its own built-in media codecs.
Is there a maximum file size?+
There's no fixed upload limit — since everything runs on your device, the practical limit is your browser's available memory, which handles typical clips and even fairly long recordings without issue.
How do I compress a WEBM?+
Drop your WEBM into the box above, pick a quality tier (and optionally a lower resolution), and download the smaller result once it finishes.
About WEBM
What is WEBM?
WEBM is an open, royalty-free video format built for the web, typically using the VP9 codec for strong compression at small sizes.
Full WEBM format guide →Full-size WEBM exports are often much larger than they need to be for how they're actually used. Compression finds a smaller file size that still looks (or sounds) right for the screen, feed, or inbox it's headed to.
How it works
- 1
Drop your file in
Drag your video onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Adjust the slider
Drag the quality slider and watch the estimated file size update in real time.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your video is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Embedding video on websites
- Keeping page load times low
- Uploading a clip to social media
- Sending a video over email or chat
Supported formats
This is one of many pairings the video toolkit handles. In total it covers:
Other compressors
Format details
About WEBM files+
WEBM is an open, royalty-free video format built for the web, typically using the VP9 codec for strong compression at small sizes.
Google introduced WebM alongside WebP as a royalty-free alternative built specifically for the browser, most commonly pairing the VP9 (or newer AV1) video codec with Opus audio in a lightweight container. That combination tends to compress noticeably better than the more universally-compatible H.264/MP4 pairing, which is why WebM shows up heavily in web video embeds and platforms like YouTube use it internally, even when they serve MP4 for broader device compatibility.
How to open a WEBM file
Opens readily in Chrome, Firefox, Edge (native), VLC Media Player. For real editing, use DaVinci Resolve, Adobe Premiere Pro (with an extension).
Good for
- excellent compression for web delivery
- royalty-free, no licensing overhead
Watch out for
- less commonly used than MP4 outside web contexts
Need another format? Try the full Video Compressor, or explore all video tools.