MP3 Converter: Convert Any File to MP3
This MP3 converter turns audio and video files into MP3 right in your browser: WAV, M4A, FLAC, OGG, Opus, WMA, AIFF and AMR, plus the soundtrack of MP4, MOV, MKV and WebM videos. Drop a whole folder, pick a bitrate from 64 to 320 kbps and download. Nothing is uploaded and there is no size cap, because the conversion runs on your device.
- Runs on your device
- WebCodecs · GPU
- FFmpeg
- Works offline
Updated
Drop your videos or audio files here
How to convert a file to MP3
Step 1: Drop your files on the box above, or tap it to choose them. Audio and video files can go in the same batch.
Step 2: Pick a Bitrate: 192 kbps suits most music, 128 kbps is plenty for speech and 320 kbps is the MP3 maximum.
Step 3: Leave Sample rate and Channels on Original (under Advanced settings) unless a device asks for something specific.
Step 4: Press Convert, then download each MP3 or grab them all as one ZIP.
Good to know
Settings explained
- Bitrate
- 128 kbps is fine for speech, 192 kbps for music, 320 kbps is the MP3 maximum.
- OGG codec
- Godot, Unity and older players need Vorbis. Vorbis uses the FFmpeg engine (≈31 MB, downloaded once).
- Opus: Smaller
- Vorbis: Games, older players
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
- FFmpeg (when needed)
- Older formats and a few filters use FFmpeg compiled to WebAssembly. It downloads once (about 31 MB) the first time it is needed and is cached for offline use.
What bitrate should an MP3 be?
For music, 192 kbps is the sensible default: most people cannot tell it from the original on phones, earbuds or car speakers. Choose 320 kbps for a lossless source you want to keep, 128 kbps for podcasts and voice, and 64 kbps only for speech where size matters most. Higher numbers never add detail the source did not have.
| Bitrate | Size per minute | 4-minute song | Good for |
|---|---|---|---|
| 64 kbps | 0.48 MB | 1.9 MB | Voice notes, lectures, phone recordings |
| 128 kbps | 0.96 MB | 3.8 MB | Podcasts, audiobooks, background music |
| 192 kbps (default) | 1.44 MB | 5.8 MB | Everyday music listening |
| 256 kbps | 1.92 MB | 7.7 MB | Music you play on good headphones |
| 320 kbps | 2.4 MB | 9.6 MB | Copies of CDs, FLAC or WAV masters |
Which files can you convert to MP3?
Almost any audio file, and any video with a soundtrack. Common formats are decoded by your browser’s own WebCodecs decoder and streamed, so long files never sit in memory. Older formats such as WMA, AMR and AC-3 are decoded by a WebAssembly build of FFmpeg that downloads once (about 31 MB) and is then cached.
Each format also has its own page with settings and answers for that pair, linked below. They run the same engine; the pair pages simply start with the right defaults.
| From | Typical source | Dedicated page |
|---|---|---|
| WAV | Recorders, DAW exports, CD rips | WAV to MP3 |
| M4A / AAC | iPhone voice memos, iTunes downloads | M4A to MP3 |
| FLAC | Lossless album downloads | FLAC to MP3 |
| OGG | Games, Linux apps, browsers | OGG to MP3 |
| Opus | WhatsApp and Telegram voice notes | Opus to MP3 |
| WMA | Old Windows Media Player libraries | WMA to MP3 |
| AIFF / AIF | Logic, GarageBand and other Mac exports | AIFF to MP3 |
| AMR | Older Android call and voice recordings | AMR to MP3 |
| MP4 video | Phone videos, downloads, screen recordings | MP4 to MP3 |
| MOV video | iPhone and Mac recordings | MOV to MP3 |
| MKV video | OBS recordings, films | MKV to MP3 |
What is an MP3 file?
An MP3 file is audio compressed with MPEG-1 or MPEG-2 Audio Layer III, a lossy codec standardised in the early 1990s. It throws away sound the ear is unlikely to notice, which makes a song between about a quarter and a tenth of its CD size, and it plays on practically every phone, car stereo, smart speaker, browser and editing app made since.
That compatibility is the whole reason to convert to MP3. Newer codecs such as AAC and Opus sound slightly better at the same size, but some players, upload forms and older devices still accept only MP3.
Is a 320 kbps MP3 good quality?
Yes. 320 kbps is the highest bitrate the MP3 format allows, and most listeners cannot reliably tell it apart from the CD or lossless original. It is the right choice when you convert from a lossless source such as WAV, FLAC or AIFF and want one copy that will last.
It does nothing for files that were already compressed. A 128 kbps MP3, a YouTube-quality M4A or a voice note converted at 320 kbps keeps the quality of its source and simply takes more space. Match the source instead: 128–192 kbps for compressed audio, 320 kbps for lossless.
Why use this MP3 converter
- No upload. Files are converted by your own browser. Voice memos, client recordings and unreleased tracks never reach a server.
- No size cap or queue. Long recordings and multi-gigabyte videos are read in chunks straight from disk, and there are no daily limits.
- Batch. Mix formats in one drop, then download every MP3 as a single ZIP. If one file is damaged, the rest still finish.
- Tags carried over. Title, artist and album tags from MP3, M4A (AAC) and FLAC sources are copied into the new MP3, so music libraries stay sorted.
- Works offline. After the first visit the page keeps working without a connection; the FFmpeg engine for rare formats is cached after its first use.
Convert to MP3 on iPhone, Android, Windows or Mac
The converter runs in any current browser, so there is nothing to install. Only the way you pick and save files changes.
iPhone and iPad
Open this page in Safari, tap the drop zone and choose Choose Files to pick audio from the Files app, or Photo Library for a video. The MP3 is saved to Downloads in Files. Voice Memos can be shared to Files first with Save to Files.
Android
In Chrome, tap the drop zone and pick files from your downloads, recorder folder or gallery. Finished MP3s land in Downloads, where music players and messaging apps can find them.
Windows 10 and 11
Drag files from File Explorer onto the drop zone in Chrome, Edge or Firefox. Windows Media Player can rip an audio CD to MP3, but Windows has no simple built-in way to convert a folder of audio files you already have.
Mac
Drag files from Finder into Safari or Chrome. The Music app can create MP3 versions too (set the import encoder to MP3 first), but only for tracks already in your library.
Tips & troubleshooting
Only need the soundtrack of videos, maybe in another format? Extract audio from video also saves M4A, WAV, FLAC or Opus.
Need a smaller file rather than a different format? The audio compressor lowers the bitrate and can switch speech to mono.
Some older car stereos and MP3 players only read 44.1 kHz files. If one refuses your MP3, set Sample rate to 44.1 kHz and convert again.
Quiet recording? Convert it, then run it through normalize audio so every file plays at the same level.
A file shows “Couldn’t read the audio”? It is usually DRM-protected (for example an old iTunes .m4p purchase) or damaged. Protected files cannot be converted by any honest tool.
MP3 Converter FAQ
How do I convert a file to MP3?
Drop the file on the box at the top of this page, keep 192 kbps (or pick another bitrate) and press Convert. Your browser saves the MP3 straight to your device. It works the same for audio files and for videos, whose soundtrack becomes the MP3.
Can I convert a YouTube link to MP3 here?
No. This page converts files that are already on your device; it does not download anything from YouTube, Spotify or other sites. Downloading from those services usually breaks their terms. If you made the video yourself, convert your own copy of the file.
Is this MP3 converter free?
Yes. There is no sign-up, no watermark, no daily limit and no paid tier for bigger files. The page runs on your own device, so it costs nothing to host each conversion.
How do I convert audio to MP3 on iPhone?
Open this page in Safari, tap the drop zone, choose the recording from the Files app and press Convert. The MP3 is saved to the Downloads folder in Files. You do not need an app or an account.
Does converting to MP3 lose quality?
From a lossless source (WAV, FLAC, AIFF) MP3 removes some detail, though at 192–320 kbps few people can hear it. From another lossy format (M4A, OGG, WMA) quality cannot improve, and a second lossy encode costs a little more, so pick a bitrate at or above the source’s.
Which bitrate should I choose?
Use 192 kbps for music in general, 320 kbps when the source is lossless, 128 kbps for podcasts and spoken word, and 64 kbps for voice notes when size matters. The compare table above shows the size per minute for each.
Are my files uploaded anywhere?
No. The conversion happens inside your browser on your own device. There is no server that receives files, so nothing is stored or shared, and you can switch to airplane mode once the page has loaded.