Compress Audio
Compress Audio shrink audio file without upload make recording smaller compress speech to mono mp3Processing stays on this device. Choose one media file up to 200 MB.
- File:
- Size:
- Duration:
Result
Make an audio file easier to send
Choose an audio file, select a 48–320 kbps output bitrate and stereo or mono, then press Compress Audio. Lower bitrates and mono save more space but discard more sound information. The download keeps the source base name and adds -compressed.mp3.
What this compressor does
The tool decodes the selected audio and re-encodes it as MP3 at a fixed bitrate. It is useful for voice notes, lectures, interviews, and other files that exceed an attachment limit. It does not remove silence, repair noise, or apply studio mastering. Those are separate editing jobs.
Worked example: reduce a meeting recording
For a thirty-minute stereo recording dominated by speech, choose 64 kbps and mono. That configuration uses roughly 14 MB before small container overhead. If voices sound metallic, switch to 96 kbps. For music, keep stereo and begin at 128 or 160 kbps rather than using the most aggressive setting.
Bitrate, duration, and expected size
Fixed-bitrate size is approximately bitrate multiplied by duration. At 128 kbps, one minute is close to 0.96 MB. Halving bitrate roughly halves audio data, while converting stereo to mono can help the encoder spend its limited bits on one channel. Actual file size includes headers and may differ slightly.
When compression is a poor choice
Do not use a small MP3 as an archive master. Editing and re-exporting lossy files can accumulate artifacts. Music with cymbals, reverberation, or dense mixes exposes low-bitrate damage sooner than speech. If the existing file is already a low-bitrate MP3, another pass may barely shrink it while making it sound worse.
Privacy, memory, and limitations
FFmpeg WebAssembly runs locally after its engine loads from Awesome Tools. The file is not sent to a conversion server. Inputs are limited to 200 MB, and available device memory may limit long uncompressed recordings. Metadata, artwork, chapters, and specialized channel layouts are not guaranteed to survive the new MP3.
Audio compression FAQ
What setting should I use for speech?
Try 64 kbps mono for maximum savings or 96 kbps mono when clarity matters more.
Can this make a file larger?
Yes. Re-encoding an already tiny source at a higher bitrate can increase its size.
Does compression remove background noise?
No. It changes encoding size, not recording content.