Convert Audio & Video to MP3
Fast, free, and secure. All conversions happen locally in your browser. No file uploads, no limits.
Click to upload or drag and drop
MP4, WAV, FLAC, M4A, OGG, WebM, Opus... (multiple supported)
Use Cases
Explore what you can do with our free online MP3 converter
Extract audio from music and videos
Save songs from music videos, concert footage, or downloaded clips as MP3. Listen offline on your phone, car stereo, or any standard player.
Try NowHow to Convert to MP3
Convert your audio or video files in 3 simple steps
Upload Your File
Drag and drop or click to select any supported audio or video file. You can upload multiple files at once.
Automatic Conversion
Our browser-based FFmpeg engine automatically converts your file to MP3 locally on your device. Nothing is uploaded to our servers.
Download MP3
Download your converted MP3 instantly. No sign-up, no watermarks, and your files never leave your browser.
Why Choose Our Converter?
100% Private
Files are converted locally in your browser. Nothing is uploaded to our servers.
Lightning Fast
Powered by WebAssembly technology for native-like performance.
Universal Support
Supports over 30+ audio and video formats including MP4, WAV, OGG, FLAC.
Free Forever
No daily limits, no file size restrictions, and no registration required.
Supported Formats
We support 30+ audio and video formats. Click any format below to convert it to MP3 free in your browser.
Supported Audio Formats
Supported Video Formats
Can't find your format?
Tell us which format you need and we'll consider adding it.
Frequently Asked Questions
Is To MP3 Converter free to use?
Yes, To MP3 Converter is completely free to use. There are no hidden fees, subscriptions, or limits on the number of files you can convert.
Is it safe to convert my files here?
Absolutely. We use advanced WebAssembly technology to convert your files locally within your browser. Your files are never uploaded to our servers, ensuring 100% privacy and security.
What formats do you support?
We support a wide range of audio and video formats including MP4, WAV, FLAC, M4A, OGG, Opus, WebM, AVI, MKV, and many more. All can be converted to high-quality MP3 format.
Do I need to install any software?
No software installation is required. Our converter works directly in your web browser (Chrome, Firefox, Edge, Safari) on both desktop and mobile devices.
How long does the conversion take?
Conversion speed depends on your file size and device performance. Since the conversion happens locally, it is usually very fast, often taking just a few seconds for average-sized files.
Can I use this on my mobile phone?
Yes, our website is fully responsive and works on modern smartphones and tablets, allowing you to convert files on the go.
Should I choose MP3, WAV, or FLAC?
For everyday listening and sharing, MP3 is the safest choice — it plays on virtually every device. WAV is uncompressed and best when you need to edit audio in a DAW. FLAC keeps lossless quality at smaller file sizes, ideal for archiving music you ripped from CD. This tool outputs MP3 so your files stay portable; use the comparison below to decide whether converting makes sense for your source.
| Format | File size | Quality | Best for |
|---|---|---|---|
| MP3 | Small | Good to very good (depends on bitrate) | Phones, cars, streaming, sharing |
| WAV | Very large | Uncompressed / lossless | Editing, mastering, recording |
| FLAC | Large (smaller than WAV) | Lossless | Music archiving, audiophile libraries |
| OGG | Small | Good at low bitrates | Games, web, open-source workflows |
Will converting my files reduce audio quality?
MP3 is a lossy format, so some data is discarded to shrink file size. Converting from a lossless source (WAV, FLAC) to MP3 will reduce theoretical quality, though at 192–320 kbps the difference is often hard to hear. Converting between two lossy formats (for example OGG to MP3) can add a small amount of generation loss. We use the LAME encoder with your chosen bitrate so exports stay as faithful as possible to the source.
Is there a file size limit?
No — we do not impose a server-side limit because your files never leave your device. Practical limits depend on your browser and hardware: very large videos (multi-gigabyte) may run slowly or run out of memory on phones or older laptops. For best results with video, we recommend files under about 2 GB on desktop. You can convert as many files as you want, one batch at a time.
What is WebAssembly, and why is local conversion safer?
WebAssembly (Wasm) lets your browser run a full FFmpeg audio engine at near-native speed without installing software. The conversion engine downloads once per session (~30 MB), then runs entirely on your CPU. Because files are read from your disk into browser memory — not sent over the internet — no one on our team (or on the network) can access your media. That is fundamentally different from upload-based converters that temporarily store files on a remote server.
Which MP3 bitrate should I use?
Choose 128 kbps for speech, podcasts, and voice memos where file size matters most. Use 192 kbps for everyday music listening. Pick 256 kbps when you want a higher-quality archive without going to the maximum. Select 320 kbps (our default) for music you care about — it is the highest standard MP3 quality and a good balance before file sizes grow noticeably. Higher bitrate cannot restore detail that was never in the original file.
Can I convert multiple files at once?
Yes. Add several audio or video files in one session, review the list, then convert them together. Files without an audio track are flagged and skipped automatically. When everything finishes, download each MP3 individually or grab them all in one ZIP. Batch conversion runs locally in your browser — no queue, no account, and no per-file fees.