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Free Online Audio Compressor

Reduce the size of MP3, WAV, FLAC, M4A and other audio files — right in your browser.

Nothing is uploadedThe file is read and rewritten on your own device.
No account, no watermarkNo sign-up, no daily limit, nothing to install.
14 formats in, MP3 outMaximum file size — 300 MB

Compress an audio file

or drop a file anywhere on this card

MP3, WAV, M4A, AAC

up to 300 MB

Files are processed in your browser and never uploaded

How to compress an audio file

Three steps, all of them in the tool above.

Upload your audio

Drag and drop a file into the upload area or click to select it. MP3, WAV, FLAC, M4A, OGG and other popular formats are supported.

Choose the quality

Pick a compression preset: Small for voice recordings, Balanced for speech and music, or High quality for music. You'll see the estimated file size right away.

Compress and download

Click Compress and watch the progress. When it's done, download the compressed MP3 to your device.

Why use our audio compressor

A fast, private and free way to shrink audio files — no software to install and no accounts to create.

100% private
Know the size in advance
Quality presets for any task
Free, no sign-up

The file is smaller. Get the words too.

This page shrinks the recording. BlaBlaScribe turns it into text.

A transcript, not just a file
Subtitles for the same video

Speaker labels, searchable text and summaries, exported to TXT, DOCX or SRT.

A transcript, not just a file

Timed captions in 120+ languages, exported as SRT or VTT.

Subtitles for the same video

Frequently asked questions

Everything you need to know about compressing audio online.

All questions
Yes, completely. There are no hidden fees, watermarks or daily limits. You don't even need to create an account — just open the page and compress.
No. The entire compression happens locally in your browser using modern web technologies. Your files never leave your device, which makes the tool safe even for private recordings, interviews or meeting notes.
You can compress MP3, WAV, M4A, AAC, FLAC, OGG, OPUS, WMA, AIFF and other popular formats. The compressed file is always saved as MP3 — the most widely supported audio format.
It depends on the source. Uncompressed formats like WAV or AIFF typically shrink by 80–90%, while already-compressed files see a smaller reduction. The tool shows the estimated output size for each quality preset before you start, so there are no surprises.
Small (64 kbps) is ideal for voice recordings, podcasts and audiobooks. Balanced (96 kbps) works well for mixed speech and music. High quality (128 kbps) is the best choice for music where sound quality matters.
At the recommended presets the difference is barely noticeable for most content. Voice recordings stay perfectly clear even at the Small preset, and the High quality preset keeps music sounding good while still saving a lot of space.
You can compress audio files up to 300 MB — enough for several hours of recording in most formats.

Discover more

Same rules: in your browser, no account, no limit.

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AI tools

Subtitle GeneratorCaptions written from the audio, not converted from a file.Subtitle TranslatorThe same cues in 50+ languages, timings kept.Video To TextA full transcript with speaker labels and timestamps.