Are my files uploaded?

No. Conversion runs entirely in your browser via ffmpeg.wasm. Files never leave your device.

What formats are supported?

Anything ffmpeg supports: MP4, WebM, MOV, AVI, MKV, FLV, 3GP for video; MP3, AAC, M4A, OGG, WAV, FLAC, OPUS for audio.

No hard limit, but >2 GB files may run out of browser memory on weaker devices.

ffmpeg.wasm runs at 30–70% of native ffmpeg speed because it uses WebAssembly. For huge files, use desktop ffmpeg.

Lossy → lossy re-encoding always loses some quality. Pick high bitrate to minimize loss.

Yes on modern iPhones (iOS 16+) and Android with 4 GB+ RAM. Older devices may run out of memory.

Convert video and audio files between formats, entirely in your browser.

First load downloads ~31 MB WASM core

Your files never leave your browserPowered by FFmpeg.wasm

ALL TOOLS · THE CATALOG

34 single-purpose utilities · runs local

All tools process files entirely in your browser · Your data never leaves your device

Media Converter — Free Universal Video & Audio

Convert between any video or audio formats — MP4, WebM, MOV, AVI, MKV, MP3, AAC, OGG, WAV — directly in your browser. Powered by ffmpeg.wasm.

Drop your file. Drag and drop any video or audio file. First use loads ffmpeg.wasm (~25 MB, cached after).
Pick output format. Select MP4 (most compatible), WebM (smallest, modern web), MOV (Apple), or audio MP3/AAC/OGG/WAV.
Set quality / bitrate. Pick a video bitrate (1 Mbps low / 4 Mbps standard / 8 Mbps HD) or audio bitrate (128 / 192 / 320 kbps).
Convert and download. Click Convert. Processing time scales with file size — typically 0.5–2× real-time.

Are my files uploaded?: No. Conversion runs entirely in your browser via ffmpeg.wasm. Files never leave your device.
What formats are supported?: Anything ffmpeg supports: MP4, WebM, MOV, AVI, MKV, FLV, 3GP for video; MP3, AAC, M4A, OGG, WAV, FLAC, OPUS for audio.
How big a file can it handle?: No hard limit, but >2 GB files may run out of browser memory on weaker devices.
Why is conversion slow?: ffmpeg.wasm runs at 30–70% of native ffmpeg speed because it uses WebAssembly. For huge files, use desktop ffmpeg.
Will quality drop?: Lossy → lossy re-encoding always loses some quality. Pick high bitrate to minimize loss.
Does it work on mobile?: Yes on modern iPhones (iOS 16+) and Android with 4 GB+ RAM. Older devices may run out of memory.