MP4

Writable

audio

digital multimedia format most commonly used to store video and audio

Identify it

Extensions	`.mp4.m4a.m4p.m4b.m4r.m4v`
MIME types	`audio/mp4video/mp4`
Signatures	`00000020667479704d344120` at byte 0 `667479704d344120` at byte 4
PRONOM	`fmt/199`
Wikidata	`Q336316`
Library of Congress	`fdd000037fdd000155`

Not sure your file is this? Identify it from its first bytes, in your browser.

Open it

AndroidOpen sourcereads and writes · Apache Software License 2.0 / GNU General Public License, version 2.0
FFmpegOpen sourcereads and writes · LGPL-2.1-or-later / GPL-2.0-or-later
FFmpeg (WebAssembly)Open sourcereads and writes · GPL-2.0-or-later
Q108353872Open sourcewrites · GNU General Public License, version 3.0
Q141647658Open sourcereads and writes · Apache Software License 2.0 / MIT License
Q141647665Open sourcewrites · Apache Software License 2.0 / MIT License
Q50938515Open sourcereads and writes · GNU Affero General Public License, version 3.0 or later
OpenH264Open sourcereads and writes · 2-clause BSD License
Apache TikaOpen sourcereads · Apache Software License 2.0
DokielOpen sourcereads · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
ExifToolOpen sourcereads · Artistic License / GNU General Public License, version 1.0 or later
HandBrakeOpen sourcereads · GNU General Public License, version 2.0
Kid3Open sourcereads · GNU General Public License / GNU General Public License, version 2.0 or later
Mapbox GL NativeOpen sourcereads · 2-clause BSD License
MapLibre GL JSOpen sourcereads · 3-clause BSD License
Music on ConsoleOpen sourcereads · GNU General Public License
OpaleOpen sourcereads · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
OpenPuffOpen sourcereads · GNU Lesser General Public License
PixiEditorOpen sourcereads · GNU Lesser General Public License, version 3.0
PuddletagOpen sourcereads · GNU General Public License
Q2596578Open sourcereads · GNU General Public License, version 2.0
TopazeOpen sourcereads · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
xineOpen sourcereads · GNU General Public License
Canon EOS 5D Mark IVwrites
Canon EOS R50writes
Creator NXT 2reads and writes
EZ CD Audio Converterwrites
Movavi Video Editorreads and writes · proprietary license
NVivowrites · proprietary license
Pinnacle Studio 17 Ultimatereads and writes
Q138339198writes
Q141249415writes
Q207902reads and writes · proprietary license
Sony Cyber-shot DSC-RX10 IIIwrites
VideoStudio Pro X5writes
Ableton Livereads · proprietary license
ACDSeereads · proprietary license
Adobe After Effectsreads · proprietary license
Adobe Premiere Proreads · proprietary license
Awave Studioreads

And 33 more in the JSON record.

Convert it

Convert a file in your browser The steps marked “in browser” run on your machine; nothing is uploaded.

To	With	Fidelity	Command and losses
FLAC 1.2.1	FFmpeg	Lossless	`ffmpeg -i in.m4v out.flac` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
WAV	FFmpeg	Lossless	`ffmpeg -i in.m4v out.wav` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
Advanced Audio Coding	FFmpeg (WebAssembly)	Partial	in browser Lossy audio only: the video is dropped.
FLAC 1.2.1	FFmpeg (WebAssembly)	Partial	in browser Audio track only: the video is dropped.
MP3	FFmpeg (WebAssembly)	Partial	in browser Lossy audio only: the video is dropped.
Ogg	FFmpeg (WebAssembly)	Partial	in browser Lossy audio only: the video is dropped.
Ogg Opus Codec Compressed Multimedia File	FFmpeg (WebAssembly)	Partial	in browser Lossy audio only: the video is dropped.
WAV	FFmpeg (WebAssembly)	Partial	in browser Audio track only: the video is dropped.
AVI	FFmpeg (WebAssembly)	Lossy	in browser Re-encoded with lossy codecs (H.264/AAC, or VP8/Vorbis for WebM).
GIF 89a	FFmpeg (WebAssembly)	Lossy	in browser 10 frames per second, at most 480 pixels wide, 256 colours, no sound.
Matroska	FFmpeg	Lossy	`ffmpeg -i in.m4v out.mkv` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
Matroska	FFmpeg (WebAssembly)	Lossy	in browser Re-encoded with lossy codecs (H.264/AAC, or VP8/Vorbis for WebM).
MP3	FFmpeg	Lossy	`ffmpeg -i in.m4v out.mp3` Lossy re-encoding.
Ogg	FFmpeg	Lossy	`ffmpeg -i in.m4v out.ogg` Lossy re-encoding.
QuickTime	FFmpeg (WebAssembly)	Lossy	in browser Re-encoded with lossy codecs (H.264/AAC, or VP8/Vorbis for WebM).
WebM	FFmpeg	Lossy	`ffmpeg -i in.m4v out.webm` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
WebM	FFmpeg (WebAssembly)	Lossy	in browser Re-encoded with lossy codecs (H.264/AAC, or VP8/Vorbis for WebM).

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), WebAssembly engines (ImageMagick, FFmpeg, Pandoc, 7-Zip, GDAL, Assimp, resvg), Just Solve the File Format Problem (File Formats Wiki), Wikidata. Updated 2026-10-26.

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