Which video formats work?

MP4, MOV, MKV, WebM and AVI with common audio codecs (AAC, MP3, Opus, Vorbis, PCM). Videos whose audio is DTS or AC-3 may fail in some browsers; the error message tells you.

Can I convert many videos at once?

Yes — drop as many as you like. They are processed one after another and packed into a ZIP when there is more than one result.

Is the quality the same as the original?

MP3 is lossy, so the result is a re-encode of the video’s audio track. At 192 kbps or higher the difference is inaudible for speech and nearly all music; choose 320 kbps for archiving.

Is anything uploaded?

No. The whole process runs in your browser, which is why there is no file-size limit beyond your device’s memory (about 2 GB).

Audio Converters

Video to MP3

Whatever the camera or app saved — MP4, MOV, MKV, WebM, even old AVI — drop it here and keep only the sound as an MP3. Ten files at once is fine.

Runs in your browser — files never leave your device.

Drop supported files here

or click to browse · paste from clipboard · up to 2000 MB each

Select files

Options

Bitrate

Trim (start–end, seconds, optional)

About Video to MP3

Lectures, interviews, podcasts recorded on video, concert clips: the useful part is often the audio, and a video file is 10–50 times larger than it needs to be. An MP3 plays on any phone, in any app and attaches to an email.

The container is opened in your browser, the audio track decoded with the browser’s own codecs and encoded with the LAME MP3 encoder compiled to WebAssembly. Video frames are never decoded, so a 1 GB file finishes in a minute or two and never leaves your device.

How to convert files to MP3

Drop one or more video files (MP4, MOV, MKV, WebM, AVI) onto the page.
Choose the MP3 bitrate — 192 kbps for music, 128 kbps for speech — and optionally a start and end time.
Click Convert and download each MP3, or all of them as a ZIP.

About the formats

MP4 · MPEG-4 Part 14 video · .mp4

The video format that works everywhere: phones, TVs, browsers, social networks. Normally H.264 video with AAC audio.

MP4 is a container; the codec inside (H.264, HEVC/H.265, AV1) decides what can play it.
H.264 MP4 is the safe choice for uploads and sharing; HEVC MP4 from newer iPhones needs extra codecs on Windows.
The “moov atom” placement decides whether a browser can start playing before the whole file downloads.

MOV · QuickTime movie · .mov

Apple’s QuickTime container, the default for iPhone videos and Mac screen recordings; very close to MP4 but not accepted everywhere.

MOV and MP4 share the same underlying structure, so MOV to MP4 usually only needs repackaging, not re-encoding.
iPhone MOV files are often HEVC (H.265) with HDR, which Windows and many web apps cannot play without conversion.
Screen recordings on Mac are MOV with H.264 and can be very large.

MKV · Matroska video · .mkv

An open container that can hold any codec plus multiple audio tracks, subtitles and chapters; popular for rips and downloads, unsupported by iPhone and many TVs.

MKV to MP4 keeps the video quality when the codec is H.264 or HEVC — only the container changes.
MP4 cannot carry every MKV feature: soft subtitles and some audio codecs (e.g. DTS) must be converted or dropped.
Most desktop players (VLC, MPV) play MKV; Safari, iOS and PowerPoint do not.

WebM · WebM video · .webm

The royalty-free web video format (VP8/VP9/AV1 video, Vorbis/Opus audio) produced by browser screen recorders, Discord and many online tools.

WebM is based on Matroska and plays in every browser, but not in iMovie, Premiere or on most phones without conversion.
Browser recording APIs output WebM, which is why screen recordings from web apps come as .webm.
WebM to MP4 requires re-encoding the video, because MP4 does not carry VP9 widely.

Related conversions

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