MP3

Writable

audio · also known as MP3

MP3 is a digital audio format, formally known as MPEG-1 Audio Layer III or MPEG-2 Audio Layer III. A third variant, known as MPEG 2.5, which supports lower bit rates implemented by the LAME MP3 encoder among others, but is not a recognised standard.

Identify it

Extensions	`.mp3`
MIME types	`audio/mpeg`
Signatures	`494433` at byte 0 (MPEG-1 Audio Layer 3 with ID3v2 Tag)
PRONOM	`fmt/134`
Wikidata	`Q42591`
Library of Congress	`fdd000012fdd000105`
Apple UTI	`public.mp3`

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

Open it

A Better CD EncoderOpen sourcewrites · Artistic License 1.0 / GNU General Public License, version 2.0 or later
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
KinoOpen sourcewrites · GNU General Public License, version 2.0 or later
LAMEOpen sourcewrites · GNU General Public License, version 2.0 / GNU Library General Public License, version 2.0
Q191782Open sourcereads and writes · GNU General Public License, version 3.0
Q240192Open sourcewrites · GNU General Public License, version 3.0
Q6928182Open sourcereads and writes · GNU General Public License
SoXOpen sourcereads and writes · GNU General Public License
CuttermaranOpen sourcewrites · GNU General Public License
TooLAMEOpen sourcewrites · GNU Lesser General Public License
AmarokOpen sourcereads · GNU General Public License, version 2.0 or later
AndroidOpen sourcereads · Apache Software License 2.0 / GNU General Public License, version 2.0
Apache TikaOpen sourcereads · Apache Software License 2.0
AquadOpen sourcereads · GNU General Public License
ClementineOpen sourcereads · GNU General Public License, version 3.0
DevILOpen sourcereads · GNU Lesser General Public License, version 2.1
DokielOpen sourcereads · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
EasyTAGOpen sourcereads · GNU General Public License, version 2.0 or later
Ex FalsoOpen sourcereads · GNU General Public License
ExifToolOpen sourcereads · Artistic License / GNU General Public License, version 1.0 or later
FlowplayerOpen sourcereads · GNU General Public License
GravemanOpen sourcereads · GNU General Public License
jPlayerOpen sourcereads · MIT License
Kid3Open sourcereads · GNU General Public License / GNU General Public License, version 2.0 or later
LiquidsoapOpen sourcereads · GNU General Public License, version 2.0
Mozilla FirefoxOpen sourcereads · Mozilla Public License, version 2.0
Music on ConsoleOpen sourcereads · GNU General Public License
NulloyOpen sourcereads · GNU General Public License, version 3.0
OpaleOpen sourcereads · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
OpenFLOpen sourcereads · MIT License
PhotoRecOpen sourcereads · GNU General Public License
Q117725Open sourcereads · GNU General Public License, version 2.0
Q141674392Open sourcereads · Apache Software License 2.0 / MIT License
Q1576579Open sourcereads · GNU General Public License, version 2.0 or later
Q3898244Open sourcereads · BSD licenses / GNU General Public License / GNU Lesser General Public License
SongRecOpen sourcereads · GNU General Public License, version 3.0
SweepOpen sourcereads · GNU General Public License
The Freesound ProjectOpen sourcereads · Creative Commons Attribution-NonCommercial 3.0 Unported / Creative Commons Attribution-ShareAlike 3.0 Unported / Creative Commons CC0 License
TopazeOpen sourcereads · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0

And 81 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.mp3 out.flac` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
FLAC 1.2.1	FFmpeg (WebAssembly)	Lossless	in browser Lossless for decoded audio; a lossy source stays as degraded as it was.
WAV	FFmpeg	Lossless	`ffmpeg -i in.mp3 out.wav` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
WAV	FFmpeg (WebAssembly)	Lossless	in browser Lossless for decoded audio; a lossy source stays as degraded as it was.
Advanced Audio Coding	FFmpeg (WebAssembly)	Lossy	in browser Lossy re-encoding.
Matroska	FFmpeg	Lossy	`ffmpeg -i in.mp3 out.mkv` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
MP4	FFmpeg	Lossy	`ffmpeg -i in.mp3 out.mp4` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
Ogg	FFmpeg	Lossy	`ffmpeg -i in.mp3 out.ogg` Lossy re-encoding.
Ogg	FFmpeg (WebAssembly)	Lossy	in browser Lossy re-encoding.
Ogg Opus Codec Compressed Multimedia File	FFmpeg (WebAssembly)	Lossy	in browser Lossy re-encoding.
WebM	FFmpeg	Lossy	`ffmpeg -i in.mp3 out.webm` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.

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), PRONOM, Wikidata. Updated 2026-10-26.

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