Free Audio Compressor: Shrink Any Audio File Instantly

No. All compression happens entirely inside your browser using WebAssembly. Your file never leaves your device, which makes this tool safe for sensitive recordings like meetings and interviews.

At 128 kbps, most listeners cannot detect any difference from the original for voice content. For music, 192 kbps or higher is recommended. Lower bitrates (32-64 kbps) are fine for speech-only recordings like voice memos and podcasts.

It depends on your source file and target bitrate. A 10-minute WAV file (around 100 MB) compressed to 128 kbps becomes roughly 9 MB, about 91% smaller. The estimated output size is shown before you compress.

Audio compression reduces file size by lowering the bitrate: the amount of data stored per second of audio. Lower bitrates discard inaudible sound details to save space, while higher bitrates preserve more of the original audio.

All common audio formats are supported as input: MP3, WAV, FLAC, AAC, M4A, OGG, OPUS, WMA, AIFF, and WEBM. The output is always a high-quality MP3 for universal compatibility.

64 kbps is ideal for podcast episodes and voice memos. It produces very small files with clear speech. For interviews where clarity matters slightly more, 96 kbps is the sweet spot.

Pick a lower bitrate until the estimated output size fits your limit — the compressor shows the estimated file size before you compress, so you can dial in a size that works for messaging apps or email attachments without guessing.