Audio Compressorby Aramin

Compress Audio for WhatsApp

Shrink M4A voice notes & recordings to under 16 MB and convert them to MP3 — instantly, in your browser.

100% Private No upload Free forever M4A → MP3
Install the app
Add to your home screen for offline use

Drop audio here or tap to browse

Select one or more files — voice notes, recordings, songs

M4A · MP3 · WAV · AAC · OGG · CAF · AMR
Target size
Mono (recommended for voice) Halves the size of speech & voice notes

How it works

Add your audio

Drop in M4A voice notes, recordings or songs — one file or many.

We pick the perfect bitrate

The tool measures each file's length and targets a size safely under 16MB.

Download or share to WhatsApp

Get a clean MP3 in seconds, then send it straight from your phone.

Why you'll like it

Totally private

Files are processed on your device and never uploaded.

Fits WhatsApp

Auto-targets under the 16MB limit every time.

M4A → MP3

Smaller, universal files that play anywhere.

Batch mode

Compress many files in one go.

Works offline

Install it as an app and use it with no internet.

Free & no sign-up

No account, no watermark, no limits.

Frequently asked questions

How do I make an audio file small enough for WhatsApp?
Drop your file here, keep the “16 MB · WhatsApp” target, and tap Compress. You'll get a smaller MP3 that fits WhatsApp's limit, ready to download or share.
What is WhatsApp's audio size limit?
WhatsApp allows roughly 16MB per shared audio or media file. This tool automatically stays under that.
Do you upload my files?
Never. Everything runs locally in your browser, so your audio stays private on your device.
Why MP3 instead of keeping M4A?
MP3 at a lower bitrate is much smaller for speech and plays on every device and app, including WhatsApp.
Does it work on iPhone and Android?
Yes. It's built mobile-first and, on supported phones, can share the compressed file straight to WhatsApp.
Is there a file limit?
No hard limit — very long recordings simply take a little longer to process.

About this audio compressor

This free online audio compressor is built for one job: to reduce audio file size so your recordings and voice notes fit inside WhatsApp's 16MB limit. It converts M4A to MP3 and other formats — MP3, WAV, AAC, OGG, CAF and AMR — entirely inside your browser, with no upload and no waiting in a queue.

Because everything is processed on-device, it's genuinely private and works even when you're offline. Add one file or a whole batch, choose your target size, and let it pick the ideal bitrate to compress voice notes and audio for WhatsApp, email or messaging. It's a fast, free way to make any audio file smaller without losing clarity.