Compress Audio Online
Shrink your MP3, WAV, or podcast file in seconds. Free, private, and no signup needed. Everything runs in your browser. Your audio never leaves your device.
Drop your audio file here
or click to select a file
Supports MP3, WAV, AAC, FLAC, OGG, M4A (Max 500MB on desktop, 100MB on mobile)
How It Works
1. Select your audio
Pick any audio file from your device. MP3, WAV, podcast recording, anything.
2. We compress it
Sondra reduces the file size right inside your browser. No uploading, no waiting in queue.
3. Download
Save your smaller audio file. Same content, smaller size.
Why Compress Your Audio?
A raw WAV recording from a one-hour podcast session can easily reach 300 to 500MB, right at the edge of what most platforms and email clients will accept. Even a standard MP3 at high bitrate can be too large to attach to a form, share via messaging apps, or upload to certain hosting platforms.
Compressing your audio reduces the file size without cutting any content. The recording stays the same length. It just takes up less space. For voice content like podcasts, interviews, and meetings, even a significant reduction in bitrate is barely noticeable to the human ear. A 500MB WAV file can compress down to under 60MB at 128kbps while sounding virtually identical.
Sondra handles the compression entirely within your browser. No file is ever sent to a server, which means your recordings stay private. Whether it's a client call, a personal note, or an unreleased track.