Why does encoding take so long?

VP8 encoding is computationally heavy, and the browser engine runs on a single thread. A 30-second clip typically takes a couple of minutes. The progress bar is accurate — and you can cancel any time.

Are my files uploaded?

No. The first time you use an audio/video tool, your browser downloads the open-source FFmpeg engine — a 32 MB file, roughly 10 MB once your connection compresses it — as a static file, and that is the only network traffic. Your media files are then processed entirely on your device and never reach a Filesvo server.

Does this work on phones?

Yes on recent devices, with limits: the engine is a 32 MB file (roughly 10 MB compressed in transit), and phones have less memory available to the browser, so large videos can fail on mobile. If a file fails on your phone, try a smaller file or a desktop browser. The 100 MB per-file limit applies everywhere.

Convert MP4 to WebM Online

WebM is the open, royalty-free video format of the web. This tool re-encodes your MP4 into VP8 video with Vorbis audio — the WebM profile that every browser which supports WebM can play, including older ones.

or drag and drop a .mp4 / .m4v file here — up to 100 MB

This tool runs the open-source FFmpeg engine in your browser. First use downloads it once (a 32 MB file, roughly 10 MB compressed in transit); after that it loads from your browser cache. Your files are never uploaded. The engine is ffmpeg.wasm, distributed unmodified under the GPL-2.0-or-later.

Processed on your device — files are never uploaded to Filesvo.

How to use Filesvo

Select or drop an MP4 video (up to 100 MB).
Click Convert to WebM — VP8 encoding is slow in the browser, so short clips are best.
Download the .webm file for your website or app.

About MP4-to-WebM conversion

WebM was created so the web could have a video format free of patent licensing. It's the conventional choice for HTML video where you control the player, and some platforms (like certain wikis and open-source projects) accept only WebM.

This tool encodes VP8 rather than the newer VP9 deliberately: single-threaded VP9 encoding in WebAssembly is impractically slow, and VP8 enjoys the widest playback support. The honest cost is that VP8 files are somewhat larger than VP9 at the same quality.

The FFmpeg command this runs

This tool is FFmpeg itself, compiled to WebAssembly and running in your browser. Below is the command it builds with the options set as they arrive — generated from the same code that performs the conversion, not written out by hand, so it cannot drift out of date. Paste it into a terminal with FFmpeg installed and it does the same job there.

ffmpeg -y -i input.mp4 -c:v libvpx -deadline good -cpu-used 4 -crf 10 -b:v 1M -c:a libvorbis -q:a 4 output.webm

The input and output names are placeholders. Your own filenames are used inside the browser, and neither file leaves your device.

Private by design

Your files are processed directly in your browser using the open-source FFmpeg engine compiled to WebAssembly and are not uploaded to Filesvo. Nothing is stored on our servers, because nothing ever reaches them.

The engine is a static file your browser downloads once and then caches — the only network request this tool makes. It is used exactly as its authors published it; see the engines and their licences.

Frequently asked questions

Why does encoding take so long?: VP8 encoding is computationally heavy, and the browser engine runs on a single thread. A 30-second clip typically takes a couple of minutes. The progress bar is accurate — and you can cancel any time.
Are my files uploaded?: No. The first time you use an audio/video tool, your browser downloads the open-source FFmpeg engine — a 32 MB file, roughly 10 MB once your connection compresses it — as a static file, and that is the only network traffic. Your media files are then processed entirely on your device and never reach a Filesvo server.
Does this work on phones?: Yes on recent devices, with limits: the engine is a 32 MB file (roughly 10 MB compressed in transit), and phones have less memory available to the browser, so large videos can fail on mobile. If a file fails on your phone, try a smaller file or a desktop browser. The 100 MB per-file limit applies everywhere.

WebM to MP4

Convert WebM videos (VP8/VP9) into H.264 MP4 files that play on Apple devices and everywhere else.

Compress Video

Shrink MP4, MOV and WebM videos with a quality you choose, plus an optional 720p cap — with honest before/after sizes.

MP4 to GIF

Turn a video clip into an animated GIF with adjustable frame rate and width, using a two-pass palette for the best colors.