Does the audio quality drop?

The video’s audio (usually AAC at 128–256 kbps) is decoded and re-encoded to MP3. At 192 kbps or above the difference is inaudible for speech and most music.

Can I extract only a part of the video?

Yes. Enter a start and end time in seconds in the Trim field.

Why is my 1 GB video taking a while?

Decoding runs at many times real speed but still has to read the whole file. A one-hour video takes roughly 20–60 seconds on a laptop.

Is anything uploaded?

Not for standard MP4/MOV/WebM files. Videos with codecs the browser cannot decode (rare) are sent to our server and deleted within an hour.

Audio Converters

MP4 to MP3

Keep the sound, drop the picture: a lecture recording, a concert clip or a voice memo saved as video becomes a compact MP3 you can play anywhere.

Runs in your browser when it can; large or unusual files use our EU server and are deleted within 1 hour.

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 MP4 to MP3

Video files are 10–50× larger than their audio. If all you need is the speech or music — a podcast recorded on video, a meeting, a song — an MP3 fits on a phone, in an email and in any player.

The video is demuxed in your browser, the audio decoded with the browser’s own codecs and encoded to MP3 with a WebAssembly encoder. No upload for files up to 2 GB; only unusual audio codecs fall back to the server.

How it works

Drop your files onto the box above, click it to browse, or paste from the clipboard.
Adjust the options if you need to — the defaults suit most cases.
Press Convert. Small files are handled on your device; larger ones are sent to our server with a progress bar.
Download the MP3 — individually or all at once.

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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