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Audio Compressor

Shrink audio files so they’re easy to email, message or upload.

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MP3, WAV, FLAC, M4A, OGG

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Free Online Audio Compressor — Make Files Smaller

Is your audio file too big to send or upload? A large song, a long voice memo or a full podcast episode can easily run into tens or even hundreds of megabytes — too heavy for an email, slow to share on chat apps, and a waste of space on your phone. Our free audio compressor fixes that in seconds by re-encoding your file into a smaller MP3 that still sounds good to the ear.

Compression works by removing data that most people cannot hear and storing the rest more efficiently. You decide the trade-off between size and quality with a simple choice of levels. A Light setting barely touches the sound and is ideal for music you want to keep crisp. A Balanced setting cuts the size a lot while still sounding clean for everyday listening. A Maximum setting shrinks the file as much as possible and is perfect for speech, voice notes and lectures, where small size matters more than studio quality.

A smaller file solves real, everyday problems. It slips under email attachment limits like Gmail's 25 MB cap, sends in a flash on WhatsApp, Telegram or Discord, uploads faster to websites and forms, and frees up storage on your device. Musicians and creators also use it to prepare demos and samples that are quick to send to collaborators without filling up an inbox.

Best of all, the whole process runs inside your browser, so your audio is never uploaded to any server. Your files stay private on your own device, there is no sign-up, no watermark and no limit on how many files you can compress. It works with MP3, WAV, FLAC, M4A, AAC and OGG input on both desktop and mobile, so you can shrink almost anything you already have.

How it works

1

Drop your file

Choose any audio file — MP3, WAV, FLAC, M4A and more. It is processed locally and never uploaded.

2

Choose a level

Pick how much to compress, from near-original Light quality to Maximum savings for speech.

3

Compress & download

Click compress and download your smaller MP3, ready to send or store.

Frequently asked questions

Will compressing reduce the quality?▾
Some quality is traded for size, but only as much as you allow. The Light and Balanced levels stay close to the original and sound clean for everyday listening; Maximum is best for voice and speech, where a tiny file matters more than perfect detail.
How much smaller will my file be?▾
It depends on the original and the level you pick, but it is common to cut a file by 50–80%. A heavy WAV or FLAC will shrink the most, since those formats are uncompressed to begin with.
Can I compress a WAV or FLAC file?▾
Yes. Uncompressed and lossless files like WAV and FLAC are exactly where compression helps most — converting them to MP3 can make them several times smaller while still sounding great.
Does compressing again and again hurt the sound?▾
Re-compressing an already-compressed MP3 over and over slowly loses quality, because each pass throws away a little more detail. For the best result, compress from your original file just once.
Is my file uploaded?▾
No. Compression runs entirely in your browser, so nothing leaves your device and nothing is stored online.
What output format do I get?▾
The compressed file is an MP3, which is small, high quality for its size, and plays on virtually every device, app and player.

Related Tools

Audio Converter Convert between MP3, WAV, FLAC, M4A, AAC, OGG and OPUS. Video to MP3 Extract the audio track from any video and save it as an MP3. Audio Trimmer Cut any audio file to the exact part you want with a visual waveform. Audio Merger Join several audio files into one track — reorder them however you like.

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