Audio format guide: when to use each
| Format | Type | Best for |
|---|---|---|
| MP3 | Lossy | Universal compatibility — podcasts, music distribution, any platform |
| WAV | Lossless | Recording, editing, professional audio — large files, full quality |
| M4A / AAC | Lossy | Apple ecosystem — iTunes, iPhone, smaller than MP3 at same quality |
| OGG / Vorbis | Lossy | Web audio, games, open-source platforms |
| FLAC | Lossless | Audiophile quality, archiving — large files, no quality loss |
| WebM audio | Lossy | Web browsers, YouTube audio streams |
How to convert audio free in your browser
- Open the free audio converter
- Upload your audio file
- Select the output format
- Download the converted file
No account. No upload to external servers. Conversion happens locally using the Web Audio API and FFmpeg compiled to WebAssembly.
The most common conversion scenarios
WAV to MP3
WAV files from recording software are typically huge — a 3-minute WAV at CD quality is about 30MB. The same audio as MP3 at 192kbps is about 4MB. Convert before uploading to a podcast host, sending via email, or sharing.
Quality note: converting WAV to MP3 is lossy — you permanently discard audio data. Keep the original WAV file as your archive; distribute from the MP3.
M4A to MP3
Apple devices export voice memos and recordings as M4A. Most non-Apple platforms prefer MP3. Convert M4A to MP3 for maximum compatibility.
MP3 to WAV
Some professional audio software or video editors require WAV input. Converting MP3 to WAV does not restore quality lost in the original MP3 compression — it just changes the container to an uncompressed format. The audio data is still MP3-quality.
Video to audio (extracting audio)
To extract audio from a video file (MP4, MOV, WebM), use the free video to audio extractor instead. It strips the audio track directly without re-encoding, preserving full quality.
Bitrate guide for MP3 conversion
When converting to MP3, you control the bitrate (quality):
- 128 kbps: acceptable for speech, podcasts, voice recordings
- 192 kbps: good for music — hard to distinguish from 320kbps for most listeners
- 256 kbps: high quality — use when audio quality is important
- 320 kbps: maximum MP3 quality — use for music distribution masters
Summary
Convert between audio formats free with the free audio converter. Use MP3 for universal compatibility, WAV for editing, M4A for Apple. Converting from lossless (WAV) to lossy (MP3) permanently reduces quality — keep your WAV original. To extract audio from video, use the video-to-audio extractor instead.
Frequently asked questions
Does converting audio quality improve the file?
No. Converting between lossy formats (MP3, M4A, OGG) cannot restore quality that was discarded during the original encoding. If you convert MP3 to WAV, you get an uncompressed file with MP3-quality audio — not original studio quality. The only lossless formats (WAV, FLAC, AIFF) preserve full quality, but only if the source recording was never compressed. Always archive the highest-quality source you have and convert down from there, never re-encode from a lossy file to another lossy format more than once.
Is it safe to convert audio files in the browser?
Yes. The audio converter uses FFmpeg compiled to WebAssembly, which runs entirely inside your browser tab. Your audio file is never uploaded to any server — conversion happens locally on your device. This matters for recordings that contain private conversations, music under license, or any other content you would not want to send to a third party.
What is the maximum file size for browser-based audio conversion?
Browser-based conversion is limited by your device's available RAM rather than a server-side quota. In practice, files up to 200–500 MB convert reliably on modern hardware. Very large files (raw WAV recordings over 1 GB) may be slow or cause the browser tab to run out of memory — in those cases, splitting the file first or using desktop software like Audacity (free) is more reliable.