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File Compressors

M4A Compressor

Compress iPhone voice memos and M4A audio.

  • Free
  • No sign-up
  • Files stay on your device

or drop a file here

paste with Ctrl/⌘+V · Accepted: .m4a

Files stay on your device — nothing is uploaded

More compressors

What does M4A Compressor do?

M4A Compressor makes M4A files smaller without uploading them anywhere. Audio is re-encoded at a lower bitrate. Higher quality keeps more of the original sound.

A WAV recording often becomes 80–90% smaller; MP3s that are already compressed shrink less.

What you can use

One or more M4A files — drag them onto the box or tap to choose.

How to use M4A Compressor

  1. Step 1

    Drop your file(s) on the upload box or tap to choose.

  2. Step 2

    Pick Light, Medium or Heavy — or drag the quality slider for exact control. The label under it shows exactly what each setting does.

  3. Step 3

    Compare the before and after sizes, then download the result (or all files at once).

Good to know

  • The quality slider: Light (about 20% smaller, best quality), Medium (about 35%, balanced) and Heavy (about 50% or more, visibly softer). Higher numbers mean better quality and bigger files.
  • For speech (podcasts, voice notes) lower settings sound fine. For music, stay on Light or Medium.
  • If a file can’t be made smaller, the tool tells you and keeps the original instead of making it worse.

Your privacy

Your file is opened and processed by your own browser — it is never uploaded. That also means big files use your device’s memory, so very large files can be slow on older phones.

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Frequently asked questions

Is M4A Compressor free?

Yes. M4A Compressor is completely free, with no sign-up, no watermark and no daily limit.

Are my files uploaded to compress them?

No. Compression runs inside your browser, on your device. Nothing is uploaded, which is why it is safe for private photos and documents — and why big videos depend on your device’s speed.

How much smaller will my file get?

It depends on the file. Phone photos often shrink 50–80%, WAV audio 80–90% and image-heavy PDFs about half. Light aims for about 20% smaller, Medium about 35% and Heavy about 50%. Files that are already compressed (MP3s, ZIPs of JPGs) change little — if the result isn’t smaller, you get your original back.

Does it work on my phone?

Yes. It works in Chrome, Safari and other modern browsers on Android and iPhone — pick files from your gallery or Files app. Large videos and long PDFs are faster on a computer.