Audio Compressor
Shrink audio files to fit WhatsApp 16 MB or Gmail 25 MB limits — target size solver, mono downmixing, dual audio player comparison & 100% private in your browser
What is Audio Compressor?
Audio Compressor is a free online audio tool from Farvixo that lets you shrink audio files to fit WhatsApp 16 MB or Gmail 25 MB limits — target size solver, mono downmixing, dual audio player comparison & 100% private in your browser. Decoding and encoding both happen in your browser through WebAssembly, so recordings, interviews and voice notes never reach a server. Free and unlimited, with no watermark or audible tag added to the output.
How to use Audio Compressor
Select or drag & drop MP3, WAV, M4A, AAC, FLAC, OGG, or Opus files. Nothing is uploaded to a server.
Select a preset (WhatsApp 16MB, Gmail 25MB, Email 10MB) or set custom bitrate and mono downmixing.
Listen to original vs compressed audio side by side, then download single files or a ZIP package.
Frequently Asked Questions
Is the Audio Compressor free?
Yes — 100% free with unlimited compressions, no signup, and no watermark.
Are my audio files uploaded to a server?
No. All audio decoding and compression happens locally inside your browser using WebAssembly. Your files never touch a server.
How does the WhatsApp 16 MB preset work?
The target-size solver calculates the exact maximum bitrate required for your clip duration to guarantee the compressed output remains under 16 MB.
Will mono downmixing reduce file size?
Yes. For speech, podcasts, and interviews, converting stereo to mono reduces file size by up to 50% without noticeable voice quality loss.
What audio formats are supported?
You can input MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WMA, and AIFF, and export to MP3, M4A (AAC), Opus, OGG, or WAV.
Can I compress multiple audio files at once?
Yes. Drop a batch of audio files to compress them in queue and download all results in a single ZIP archive.
What you can use Audio Compressor for
- Fitting a podcast episode or voice note under a messaging or email size limit
- Converting a recording to the format a player, DAW or upload form requires
- Journalists and researchers handling interview audio that must stay private
- Preparing audio for a video edit at a consistent bitrate and sample rate
Audio Compressor at a glance
- Tool
- Audio Compressor — Audio Tools
- Purpose
- Shrink audio files to fit WhatsApp 16 MB or Gmail 25 MB limits — target size solver, mono downmixing, dual audio player comparison & 100% private in your browser
- Input
- One or more files (MP3, WAV, M4A, AAC, FLAC, OGG, Opus, MP3, WAV, AAC, M4A, FLAC, OGG, OPUS, WMA, AIFF)
- Output
- Audio file in the selected format and bitrate
- Processing
- In your browser — files are never uploaded to a server
- Price
- Free, unlimited, no account required
- Limitations
- Bounded by your device's memory and CPU rather than a server quota; very large files may be slow on older hardware
Tips for better results
- Speech is fine in mono — downmixing halves the file size with no perceptible loss on voice content.
- For spoken word, 64–96 kbps is transparent; music generally needs 128 kbps or more.
- Every lossy re-encode loses information. Always start from the highest-quality original you have, not from a file you already compressed.
Common problems and how to fix them
The file will not load
The container is fine but the codec is unusual, or the file is partially downloaded. Re-download the original and try again.
The output sounds thin or watery
The bitrate is too low for the material. Raise it a step, and keep stereo if the source is music rather than speech.
Volume is inconsistent across the file
Enable loudness normalisation, which levels the track to a single EBU R128 target instead of leaving the peaks and quiet passages as they were.
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