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Audio converter

Convert audio to MP3 or WAV — from M4A, OGG, FLAC, WAV, MP3 and more. Private — no upload

Click to choose or drag & drop audio files here

MP3, WAV, M4A/AAC, OGG, FLAC, WEBM · convert many at once

    Notes

    MP3 is compressed and plays everywhere; a higher bitrate means better quality and a bigger file (192–320 kbps is roughly CD quality). WAV is uncompressed and lossless — larger, but ideal for editing. Input can be almost any common format your browser can read: MP3, WAV, M4A/AAC, OGG, FLAC or WEBM.

    Everything runs on your device — nothing is uploaded. A long track takes a few seconds to encode.

    How to use the audio converter

    1. Choose your output at the top: MP3 (compressed, plays everywhere) or WAV (uncompressed 16-bit PCM, ideal when an editor or sampler wants raw audio).
    2. Converting to MP3? Pick a bitrate: 128 kbps suits speech and audiobooks, the default 192 kbps is solid general-purpose quality, and 256–320 kbps is for music you care about. Higher bitrate means better sound and a bigger file.
    3. Drop in one file or many — MP3, WAV, M4A/AAC, OGG, FLAC or WEBM. Batches convert one at a time so the page stays responsive while it works.
    4. Each finished track appears in the list with its duration and new size — click Download next to each one. A file that can't be decoded shows an error instead of stopping the batch.

    Common uses

    • Turn an iPhone voice memo (M4A) into an MP3 that plays anywhere and attaches to anything.
    • Convert an MP3 or FLAC to WAV for an audio editor, sampler or DAW that expects uncompressed input.
    • Shrink a big lossless file: a 4-minute song that's about 40 MB as WAV becomes roughly 6 MB as a 192 kbps MP3.
    • Standardize a mixed folder of OGG, FLAC and M4A clips into one format in a single batch — for a podcast edit, a course upload or an older car stereo.

    Tips & limitations

    • Converting a lossy file (MP3, M4A, OGG) to WAV doesn't restore quality — it just unpacks the already-compressed audio into a much larger container. Do it only when a program insists on WAV input.
    • Every MP3 re-encode loses a little quality (generation loss). When you have a lossless original — WAV or FLAC — convert from that rather than from another MP3.
    • MP3 output is mono or stereo: a surround (5.1) source keeps only its first two channels. WAV output keeps all the channels of the original.
    • Metadata isn't copied. The converter reads audio samples only, so ID3 tags — title, artist, album art — won't be in the new file.
    • The whole file is decoded into memory before re-encoding, so a multi-hour recording can be slow or fail outright on phones and low-RAM machines. Split very long recordings first.

    How it's built & why it's safe

    Audio is decoded with the browser's Web Audio API (decodeAudioData) into raw PCM samples, then re-encoded on your device: WAV files are written straight from those samples as 16-bit PCM, and MP3s are produced by lamejs, an open-source JavaScript port of the LAME encoder. There's no server, queue or account — your files are never uploaded, and the only things fetched over the network are the page itself and the small encoder script. Close the tab and nothing of your audio remains.

    Related tools: Video Converter · Vocal Remover · Image Converter

    Further reading: How to extract audio from a video (and which format to pick) · Why Toolkit runs entirely in your browser (and why that matters)

    Frequently asked questions

    Which formats can I convert?

    Input can be MP3, WAV, M4A/AAC, OGG, FLAC or WEBM — anything your browser can decode; output is MP3 or WAV. Decoding relies on the browser itself, so a rare codec that won't play in a browser tab won't convert either.

    Is my audio uploaded?

    No. Files are decoded and re-encoded entirely in your browser, so they never leave your device. That makes it fine for private voice memos, interviews, demos and unreleased music.

    What MP3 bitrate should I choose?

    128 kbps is fine for speech, 192 kbps (the default) is good general-purpose quality, and 256–320 kbps is best for music — 320 is the highest MP3 allows. Size scales with bitrate: a minute of 320 kbps audio is about 2.4 MB.

    Can it output M4A, AAC, FLAC or OGG?

    Not yet — browsers can't reliably encode those formats on their own, so this tool sticks to MP3 and WAV, which it can produce dependably offline. If you specifically need M4A, the video converter on this site can encode audio to M4A with its FFmpeg engine.

    Does converting to WAV improve sound quality?

    No. WAV is lossless, but converting an already-compressed MP3 or M4A to WAV only repackages the same audio in a bigger file. Quality can be preserved, never recovered.

    Why did one of my files fail to convert?

    It means the browser couldn't decode it — usually an unsupported codec (WMA, for example), a DRM-protected purchase, or a corrupted file. Quick test: if the file won't play when opened directly in a browser tab, it won't convert either.

    Is there a limit on how many files or how long they can be?

    You can queue as many files as you like; they convert one at a time so the page stays responsive. Length is bounded only by your device's memory — very long recordings are the main thing that hits limits.