Audio & Video
11 tools
Convert audio and video without uploading a single byte. Audio decodes with your browser's own engine; video runs on ffmpeg compiled to WebAssembly, downloaded once and cached. Slower than a server farm — and completely private.
- Nothing is uploaded, ever
- MP3, WAV, MP4, MOV and more
- No length watermarks or fees
Audio
Video
- MP4 to MP3Extract the audio track of a video as MP3.
- MOV to MP4Convert iPhone MOV videos to universal MP4.
- WEBM to MP4Convert WEBM screen recordings to MP4.
- Video to GIFTurn short video clips into animated GIFs.
- GIF to MP4Turn heavy animated GIFs into light MP4s.
- Subtitle ConverterConvert subtitle files between SRT and VTT.
Frequently Asked Questions
How can video convert without uploading?
The tools ship ffmpeg — the same engine desktop converters use — compiled to WebAssembly. Your browser downloads it once (about 30 MB), caches it, and every conversion after that runs on your own device.
Is browser conversion slower than an online service?
Encoding runs at roughly the speed of your own computer — about real-time for video. What you save is the upload and download of the file itself, plus every privacy question.
Which formats are supported?
Audio: MP3, WAV, M4A/AAC, OGG/Opus and FLAC in; MP3 and WAV out. Video: MP4, MOV, WEBM and GIF in; MP4, MP3 and GIF out.