Design
Audio Converter
Convert audio files right in your browser – from MP3, WAV, AIFF, FLAC, OGG or M4A to WAV, AIFF, FLAC, MP3 or OGG Opus. With sample rate, mono/stereo, trimming and volume normalization. The file is not uploaded.
- Runs entirely in your browser
- No data upload
- No sign-up
- Free
Audio file
Convert to
Result
Nothing converted yet.
Guide
How it works
- Choose a file
Drag an audio file onto the field or select it – MP3, WAV, AIFF, FLAC, OGG, Opus or M4A (AAC and Apple Lossless, e.g. iPhone voice memos). The tool shows duration, sample rate, channels and a waveform.
- Trim if needed
Drag across the waveform with the mouse or enter the start and end in seconds. Clicking the waveform plays from that point.
- Choose a format
WAV and AIFF are uncompressed, FLAC is lossless and about half the size, MP3 is small and plays on every device, OGG Opus is even more efficient and ideal for the web. Sample rate, mono/stereo and volume can be adjusted.
- Convert and save
After converting, you can preview and download the result. Everything happens on your device – nothing is uploaded, even for large files.
FAQ
Frequently asked questions
Can I open iPhone voice memos and Apple Lossless files?
Yes. M4A files contain either AAC (lossy) or Apple Lossless (ALAC, e.g. voice memos with the “Lossless” setting or music in Apple Lossless quality). Your browser decodes AAC itself; Chrome, Edge and Firefox cannot decode ALAC – for that, the tool has its own decoder that reads the file bit-exactly. Nothing is uploaded here either.
Is my file uploaded?
No. Reading, converting and encoding run entirely in your browser. You can even use the tool without an internet connection once the page has loaded.
How is the MP3 file created?
Browsers do not include an MP3 encoder – so the tool has its own encoder of about 25 KB (MPEG Layer III with constant bitrate), without any third-party library. It is deliberately simple and has no psychoacoustic model: for music, 192 kbit/s or more is recommended; for speech, 64–128 kbit/s is enough. If you want the best results at a low bitrate, use OGG Opus.
MP3 or OGG Opus – which is better?
MP3 really plays on every device, from old car radios to phones. Opus sounds better at the same size and is ideal for websites and voice recordings, but is not supported by some older devices.
Does the sound improve if I convert MP3 to WAV or FLAC?
No. What was lost during MP3 encoding does not come back – the file just gets bigger. It still makes sense if a program cannot read MP3 or you want to edit the file further.
What is the difference between WAV, AIFF and FLAC?
WAV (Windows) and AIFF (Apple) store the sound uncompressed and are correspondingly large. FLAC packs the same data losslessly – usually to half or two thirds of the size – and restores it exactly during playback.
Which bit depth and sample rate should I choose?
For music, 16-bit and 44,100 Hz (CD quality) are enough; for video, 48,000 Hz is common; for speech, 16,000 Hz in mono is sufficient. 24-bit is only worthwhile if the source itself has more than 16 bits and you edit it further.
Why is OGG Opus grayed out?
The tool creates Opus with the encoder built into the browser (WebCodecs). Current versions of Chrome, Edge and Firefox have it; some browsers, e.g. older Safari versions, lack it. WAV, AIFF and FLAC work everywhere.
How large can the file be?
That depends on your device’s memory. Songs and podcasts are no problem; very long recordings in high quality may reach limits on older phones.