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Audio converter - change any sound file to MP3, WAV, OGG, FLAC or M4A

Drop in a song, a podcast episode or a voice memo and save it in the format you need. The conversion runs on your own device, so the file never leaves your computer or phone.

  • Free
  • No sign-up
  • Private
  • Runs locally

Drag & drop files here

or click to choose from your device

MP3, WAV, M4A, OGG, FLAC, AAC, OPUS · also the audio track of a video

How to convert an audio file

  1. 1.

    Choose a file

    Drop an MP3, WAV, M4A, OGG, FLAC, AAC or OPUS file onto the area above, or click to pick one. A video file works too - only its soundtrack is used.

  2. 2.

    Pick the output format

    Select MP3, WAV, OGG, FLAC or M4A (AAC). Formats your browser cannot encode are hidden automatically.

  3. 3.

    Adjust quality

    For lossy formats choose a bitrate (192 kb/s is the default). Optionally change the sample rate or switch on Mono (single channel).

  4. 4.

    Convert and download

    Click the Convert button, listen to the result in the player and download it. The file keeps its original name with the new extension.

Which format should you pick?

  • MP3 - plays on practically everything: car stereos, old MP3 players, smart TVs, every app. About 1.4 MB per minute at 192 kb/s.
  • M4A (AAC) - the native format of iPhones, iTunes and many streaming services. Sounds slightly better than MP3 at the same bitrate.
  • OGG (Opus or Vorbis) - an open format used in games, web pages and Linux software. Very efficient for speech.
  • FLAC - lossless compression. A perfect copy of the source at roughly 50-60% of the WAV size, ideal for archiving CDs.
  • WAV - uncompressed PCM, about 10 MB per stereo minute. Best for editing in Audacity or a DAW.

Bitrate, sample rate and mono explained

Bitrate applies to MP3, M4A and OGG and sets how much data is used per second. The options run from 64 to 320 kb/s: 128 kb/s is fine for speech, 192-256 kb/s suits music and 320 kb/s is the MP3 maximum. A quick size check: 192 kb/s × 240 s ÷ 8 = 5,760 KB, so a 4-minute song becomes about 5.8 MB.

Sample rate can stay at "Keep original" or be set to 48, 44.1, 32, 22.05 or 16 kHz. Leave music alone; 22.05 or 16 kHz is enough for voice notes and transcription software. Mono mixes both channels into one, which halves a WAV or FLAC file and lets you use a lower bitrate for speech without audible loss.

What your browser can encode

MP3 and WAV always work: MP3 is encoded by a small WebAssembly module that loads only when needed, WAV is written directly. M4A, OGG and FLAC rely on encoders built into the browser, so availability varies - Chrome and Edge usually offer the most options. If a format is missing from the list, try another browser or use MP3.

The tool shows the source codec, sample rate and channels plus an estimated output size before you convert. Nothing is uploaded: decoding and encoding happen locally, which also means you can convert private recordings safely. Very long files are limited only by your device memory.

Mistakes that cost quality or space

  • Converting MP3 to FLAC or WAV to "improve" it - lossless formats keep exactly what is in the MP3, so the file only gets bigger.
  • Chaining lossy conversions (MP3 to OGG to MP3) - each lossy step adds artefacts. Always start from the best source you have.
  • Raising a 128 kb/s file to 320 kb/s - the result is 2.5 times larger and sounds the same.
  • Mono for music - fine for podcasts, but it flattens the stereo image of songs.

Need a single conversion? The dedicated WAV to MP3 and M4A to MP3 pages skip the format choice, and Video to MP3 is tuned for movie files.

Frequently asked questions

Is the audio converter free?

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Yes. There is no sign-up, no file limit and no watermark or jingle added to the result.

Are my files uploaded anywhere?

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No. The file is decoded and encoded in your browser, so it never leaves your device.

Will converting MP3 to FLAC improve the sound?

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No. FLAC stores exactly what the MP3 contains, so quality stays the same and the file grows several times. Use FLAC only with lossless sources such as WAV or CD rips.

Why can I not see M4A, OGG or FLAC?

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Your browser lacks an encoder for that format, so the option is hidden. MP3 and WAV always work; for the others try a recent Chrome or Edge.

Can I convert the sound from a video?

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Yes. Drop an MP4, MOV or WebM file and the tool converts only its audio track. Video to MP3 is a dedicated page for that job.

What bitrate should I choose for music?

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192-256 kb/s is a good balance and 320 kb/s is the MP3 maximum. For speech 64-128 kb/s is enough.

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