Start here
Convert your file to MP3
The file stays in this browser.
- Choose your audio or video
- Pick the MP3 quality
- Download your MP3
Audio conversion uses FFmpeg through the single-threaded @ffmpeg/core 0.12.10 build, licensed under GPL-2.0-or-later. FFmpeg. ffmpeg.wasm.
Convertola is a free online MP3 converter that runs inside your browser: a file to MP3 converter for the videos and recordings already on your phone or computer. Pick a file, choose the quality, and download an MP3 that plays in any car stereo, phone, music app or editor. The conversion uses FFmpeg compiled to WebAssembly, so the file you choose stays on your device the whole time.
How it works
How do I convert a file to MP3?
Click Browse files or drag a video or audio file onto the converter.
Under Audio quality, pick 128, 192, 256 or 320 kbps. 192 kbps is selected by default.
Click Convert to MP3 and wait for the progress bar. You can cancel at any time.
Change the Download name if you like, then click Download MP3.
That is the whole process on Windows, macOS, Linux, ChromeOS, Android and iPhone. There is nothing to install and no account to create.
Good to know
Which files can this MP3 converter open?
This MP3 file converter accepts 12 formats, one file at a time, up to 150 MB. It works as a file converter to MP3 for both families: from a video, it keeps the first audio track and drops the picture. From an audio file, it re-encodes the sound as MP3.
| Your file | Type | Where it usually comes from | Dedicated page |
|---|---|---|---|
| MP4 | Video | Android phones, cameras, video editors | MP4 to MP3 |
| MOV | Video | iPhone, iPad, QuickTime on Mac | MOV to MP3 |
| WEBM | Video or audio | Browser and screen recorders | WEBM to MP3 |
| MKV | Video | Matroska files with several tracks | MKV to MP3 |
| MPEG / MPG | Video | DVD-era camcorders and older software | MPEG to MP3 |
| WAV | Audio, uncompressed | Recorders, DAWs, CD rips | WAV to MP3 |
| FLAC | Audio, lossless | Music downloads and archives | FLAC to MP3 |
| M4A | Audio | iPhone Voice Memos, iTunes Store purchases | M4A to MP3 |
| AAC | Audio | Raw AAC streams and recorders | AAC to MP3 |
| OGG | Audio | Games, Linux apps, Vorbis music | OGG to MP3 |
| OPUS | Audio | WhatsApp voice notes, VoIP recordings | OPUS to MP3 |
| MP3 | Audio | Any MP3 you want at a different bitrate | This page |
Not sure what you have? The video to MP3 converter takes every video format above, and the audio to MP3 converter takes every audio format.
Good to know
Is this free MP3 converter safe to use?
Yes. The file never leaves your device. When you open the page, your browser downloads the conversion engine (ffmpeg.wasm, a WebAssembly build of FFmpeg). After that, the MP3 is created on your own computer or phone. Nothing is uploaded to Convertola, so there is no copy on a server to delete later.
Most sites that offer a converter to MP3 upload your file to their servers and delete it on their own schedule, for example after an hour. That is fine for a song, but less fine for an interview, a voice note or a recording of a meeting. A browser-based converter avoids the question entirely. Read our privacy policy for the details.
The page also has no extra download buttons, no installer and no browser extension. The only file you get is the .mp3 you asked for.
Formats
Which MP3 bitrate should I choose?
Start with 192 kbps. It suits music and speech, and it is the default. Use 128 kbps for podcasts, lectures and voice notes. Use 256 or 320 kbps for music from a lossless source such as WAV or FLAC.
| Bitrate | Best for | One minute of MP3 (measured) |
|---|---|---|
| 128 kbps | Speech, audiobooks, voice notes | 960,931 bytes (0.96 MB) |
| 192 kbps | Everyday music and video audio | 1,441,375 bytes (1.44 MB) |
| 256 kbps | Music on good headphones | 1,921,819 bytes (1.92 MB) |
| 320 kbps | Music from WAV or FLAC | 2,402,263 bytes (2.40 MB) |
We encoded the same 60-second stereo clip at 44.1 kHz with FFmpeg 7.1 and the LAME encoder at a constant bitrate (CBR). With CBR, the size depends almost only on duration and bitrate: roughly kbps × seconds ÷ 8 = kilobytes.
How it works
How big will my MP3 file be?
About 1.44 MB per minute at the default 192 kbps, no matter what you start with. We converted the same minute of audio from ten different source formats. Every MP3 came out between 1,441,196 and 1,442,105 bytes.
| Example | 128 kbps | 192 kbps | 320 kbps |
|---|---|---|---|
| 3-minute song | 2.9 MB | 4.3 MB | 7.2 MB |
| 30-minute lecture | 28.8 MB | 43.2 MB | 72.0 MB |
| 1-hour podcast | 57.6 MB | 86.4 MB | 144.0 MB |
The 150 MB limit applies to the file you choose, not to the MP3. A 150 MB video usually becomes an MP3 of a few megabytes.
Formats
Does converting to MP3 lose quality?
A little. MP3 is a lossy format: it removes sounds the ear barely notices to make the file smaller. From a WAV or FLAC at 256 or 320 kbps, most people cannot hear the difference. From a file that is already compressed, such as AAC, OGG or OPUS, you are compressing a second time, so stay at 192 kbps or higher for music.
One rule no converter can break: a higher bitrate cannot add detail that the original never had. Turning a 128 kbps MP3 into a 320 kbps MP3 makes the file bigger, not better.
Devices
Can I use this MP3 converter on my phone or PC?
Yes. It works in current versions of Chrome, Edge, Firefox and Safari, on any device that supports WebAssembly.
On iPhone and iPad
Open the page in Safari, tap Browse files, and choose a video from your Photo Library or a recording from the Files app. After the conversion, the MP3 is saved in Files > Downloads.
On Android
Open the page in Chrome, tap Browse files, and pick a video from your gallery or an audio file from your file manager. The MP3 is saved to your Downloads folder.
On Windows, Mac and Linux
Drag a file from File Explorer or Finder onto the converter. Long or large files convert faster on a computer than on a phone, because the browser has more memory to work with.
Good to know
What does this MP3 converter not do?
It does not download from links
It cannot fetch audio from YouTube, TikTok or any other website. It converts files that are already on your device.
It converts one file at a time
There is no batch mode. For a whole music library, a desktop tool such as FFmpeg or Audacity is a better fit.
It has a 150 MB limit per file
Trim long videos first, or use a desktop tool.
It does not edit audio
There is no trimming, volume adjustment or tag editor.
Only convert files you have the right to use. See our copyright page.
More detail in our guides: Best MP4 to MP3 Converter: What Actually Matters and Convert to MP3 on Windows 10 and 11: Free Options Compared.
FAQ
Frequently asked questions about the MP3 converter
Is this MP3 converter free to use?
Yes. Converting a file costs nothing, and you do not need to create an account or sign in.
Are my files uploaded to a server?
No. The MP3 is created in your browser with FFmpeg compiled to WebAssembly. Your file stays on your device.
What is the best bitrate for MP3?
192 kbps is a good default for music and speech. Use 128 kbps for voice recordings and 320 kbps for music from WAV or FLAC.
Can I convert a video to MP3?
Yes. Choose an MP4, MOV, WEBM, MKV or MPEG file and the converter keeps the first audio track as an MP3.
Can I convert YouTube videos with this converter?
No. Convertola only converts files that are already on your device. It does not download anything from YouTube or other websites.
Why does my file fail to convert?
The file may be larger than 150 MB, in a format that is not on the list, damaged, or a video without any audio track. On phones, very long files can also run out of browser memory; try a computer instead.
How long does a conversion take?
Usually a few seconds to a minute. It depends on the length of the file and the speed of your device, because the work happens on your own processor.
Can I convert several files at once?
No. The converter handles one file at a time. Convert the next file once the first download is done.
Get started
Convert your file to MP3
Choose a video or audio file, set the quality, and download your MP3 without leaving the browser.
Formats
