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Audio Compressor

Shrink WAV and other audio files right in your browser — reduce the sample rate and convert to mono to cut file size, with nothing uploaded.

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Audio Compressor

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Result

🔒 Decoded and re-encoded in your browser with the Web Audio API — nothing is uploaded.

Size per minute
    Audio facts
    • 10.1 MB/minUncompressed WAV size = sample rate × bytes per sample × channels. CD-quality stereo (44.1 kHz, 16-bit) is about 10.1 MB per minute.
    • 16 kHz monoPlenty for speech: it keeps everything up to 8 kHz, and speech-recognition models such as Whisper resample to 16 kHz mono anyway.
    • −14 / −16 LUFSSpotify, YouTube and Amazon normalise to about −14 LUFS; Apple Music and Apple Podcasts to −16 LUFS; EU broadcast (EBU R128) to −23 LUFS, all with a −1 dBTP peak ceiling.
    • Lossy in, WAV outConverting MP3, M4A or OGG to WAV keeps today's quality but can't restore detail the lossy codec already removed — it just makes editing lossless from here on.

    Loudness measured per ITU-R BS.1770-4 (K-weighted, gated); platform targets checked October 2026.

    Runs in your browser — nothing you enter is uploaded or stored.

    ToolFeather · Downsample + mono
    Scratchpad auto-saved
    Stored in this browser (localStorage)
    Step-by-step~40s read

    How it works — in four simple steps

    No signup and nothing to install — it all runs in your browser.

    1

    Select an audio file

    Choose a WAV, MP3, M4A or OGG file from your device.

    2

    Pick a sample rate

    Lower sample rates make smaller files; 22,050 Hz is plenty for speech, higher suits music.

    3

    Choose channels

    Switch to mono to roughly halve the size when stereo isn't needed, such as for voice.

    4

    Compress and download

    Press Compress audio, preview the result, and download the smaller WAV.

    Pro tip

    Speech stays clear at 16 kHz mono — about a sixth the size of CD-quality stereo WAV. Opus/AAC output (where your browser supports it) is ~10× smaller again.

    Features

    Shrink WAV and other audio

    Cut audio file size by lowering the sample rate and converting stereo to mono — the two things that drive WAV size.

    Load common formats

    Open WAV, MP3, M4A or OGG files; the tool decodes them and exports a smaller 16-bit WAV.

    See the size saved

    Compare the original and compressed size so you know the result before you download.

    Nothing uploaded

    Decoding and re-encoding happen with the Web Audio API in your browser — your recordings never leave your device.

    Preview before saving

    Play the compressed audio to check it still sounds right for your purpose.

    About the Audio Compressor

    Audio files — especially uncompressed WAV — can be huge, which makes them slow to email, upload or store. This compressor shrinks them by reducing the two things that drive WAV size: the sample rate (how many samples per second) and the channel count (stereo vs mono). Both are lossy in the sense that they discard detail, but for voice recordings, podcasts, notes and game audio the difference is often inaudible while the file gets dramatically smaller.

    Drop in a WAV (or an MP3, M4A or OGG — the browser decodes them all), choose a target sample rate and mono or stereo, and the tool re-renders the audio and gives you a compressed 16-bit WAV to download, with a before-and-after size comparison and a preview player. Converting a 44.1 kHz stereo clip to 16 kHz mono, for example, cuts the data to roughly a sixth.

    Everything happens in your browser using the Web Audio API — your audio is never uploaded, which matters for private recordings, and it works offline once loaded.

    Examples

    A 20 MB stereo WAV → 16 kHz mono → around 3–4 MB, ideal for voice.
    Podcast or voice note → mono at 22,050 Hz keeps speech crisp and small.
    Game/UI sound effects → 22,050 Hz shrinks them with no audible loss.

    Frequently asked questions

    5 answers
    How does this compress a WAV file?
    It reduces the sample rate and (optionally) mixes stereo down to mono, then re-encodes a 16-bit WAV. Fewer samples and fewer channels mean a much smaller file. For speech, 16 kHz mono is usually indistinguishable from the original while being far smaller.
    Is my audio uploaded to a server?
    No. The file is decoded and re-encoded entirely in your browser with the Web Audio API, so your audio never leaves your device.
    What audio formats can I compress?
    You can load WAV, MP3, M4A/AAC and OGG — anything your browser can decode. The output is always a compressed 16-bit WAV.
    Why is the output a WAV and not an MP3?
    WAV encoding is built into the browser and needs no external library, keeping the tool fast, private and dependency-free. Reducing the sample rate and channels still shrinks WAVs dramatically. For maximum compression at a given quality, a dedicated MP3 encoder would go further.
    Will compressing reduce the audio quality?
    Lowering the sample rate discards the highest frequencies and mono merges the channels, so there is some quality loss — but for voice, podcasts and effects it's usually inaudible. Keep the original sample rate and stereo if you need full fidelity.