How to convert audio & video files (free, in your browser)

Need to change a file's format before you transcribe, share, or store it? Our free converters switch audio and video between common formats — WAV ↔ MP3, MOV → MP4, MKV → MP4, and M4A → MP3. Everything runs right in your browser, so your file never leaves your device — nothing is uploaded.

Steps

1. Open the converter you need. For example WAV to MP3, MOV to MP4, or M4A to MP3. Each one is a single-purpose page.
2. Choose your file. Click the Choose a … file button and select it. Each page accepts the format it converts from, and handles files up to 200 MB.
3. Click Convert. The conversion happens entirely on your device. The very first conversion takes a few extra seconds to get ready; after that it's quick — you'll see the progress as it runs.
4. Download the result. Click Download to save your converted file, then use Convert another file if you have more to do.

Private by design. Because the conversion runs in your browser, your file is never sent to a server — it stays on your device the whole time.

Want the words instead? To turn a recording into text — or into subtitles (.srt) or a Word/PDF document — that's transcription, not a format conversion. See how to transcribe a file for free.