FileAppsFileApps
Audio Tools3 formats supported

Free online audio compressor

Use this free online audio compressor to reduce audio file size in your browser. Compress MP3, WAV, M4A, OGG, and more for email, sharing, podcasts, and voice recordings without uploading your file.

  • Bitrate-based compression (96kbps to 320kbps)
  • Sample rate adjustment
  • Mono/stereo channel control

Supported formats

MP3AACOGG

Adjust compression settings

Balance file size, quality, and output format before you start.

1
2
3
4
5

Drag & drop Audio Compressor

or click to browse

Supported: MP3, WAV, OGG, M4A, FLAC, AAC

How It Works

A simple three-step flow from upload to download.

  1. 1

    Upload your audio file to compress.

  2. 2

    Choose a target bitrate and sample rate.

  3. 3

    Process and download the compressed audio file.

Features

Key capabilities surfaced as quick-scan cards.

  • Bitrate-based compression (96kbps to 320kbps)

  • Sample rate adjustment

  • Mono/stereo channel control

  • Size estimator before processing

Related Tools

Nearby workflows people often use before or after this audio tool.

Audio Converter

MP3 · WAV · AAC

Convert audio files between MP3, WAV, AAC, OGG, FLAC, M4A, and WMA.

Open tool

Audio Trimmer

MP3 · WAV · AAC

Cut and trim audio segments with precise start/end time controls.

Open tool

Audio Effects

MP3 · WAV · AAC

Apply filters, speed changes, reverse, and volume adjustments to audio.

Open tool

Extract Audio

MP3 · AAC · WAV

Extract the audio track from any video file and save it as MP3, AAC, WAV, OGG, or FLAC.

Open tool

How to compress audio online

  1. 1

    Upload your audio file

    Drag your file into the compressor or select it from your device. You can compress common formats like MP3, WAV, M4A, OGG, FLAC, and more.

  2. 2

    Choose compression settings

    Lower the bitrate to reduce audio file size, and switch to mono or a lower sample rate when the file is mostly speech. This helps you shrink the file based on whether it is music, a podcast, a meeting, or a voice note.

  3. 3

    Compress and download

    Start the compression and download the smaller file when it is ready. The process runs in your browser, so you can compress audio online without uploading the recording to a remote service.

Understanding the settings

Bitrate is usually the biggest factor when you want to reduce audio file size. For music, staying around 128 kbps or 192 kbps often keeps quality acceptable while cutting size. For podcasts, meetings, and voice recordings, lower settings can work well, especially if you switch to mono. Sample rate can also help, but it matters less than bitrate for most casual use. If you are unsure where to start, compress to MP3 with balanced settings first, then go lower only if the file is still too large.

Best settings for common goals

Podcasts and speech

96 kbps, mono, and a reduced sample rate when clarity is still acceptable.

Speech usually compresses well, so these settings cut file size sharply without hurting intelligibility much.

Music with reasonable quality

128 kbps or 192 kbps in stereo.

That range is usually the safest compromise between size reduction and audible quality for casual listening.

Format comparison

FormatBest forFile sizeQuality
MP3General sharing, email, and playbackSmallBest compatibility
M4A (AAC)Mobile playback and Apple devicesSmallEfficient lossy audio
WAVEditing or source format before compressionLargeLossless
FLACLossless archive before creating smaller copiesMedium to largeLossless

Practical guidance

Speech files and music files should not use the same settings

A voice note, interview, or meeting recording can often sound fine at settings that would noticeably damage a song. Matching the compression profile to the content is more important than chasing one universal bitrate.

  • Mono and lower sample rates are often acceptable for speech-first material.
  • Music usually deserves higher bitrate and stereo output to avoid obvious damage.
  • If you are unsure, start with a moderate preset and listen before reducing more aggressively.

Compatibility, privacy, and limitations

Best sharing format

MP3 remains the easiest output for broad compatibility. If you are unsure, keep the destination format simple and then tune bitrate, channels, and sample rate for the size target.

Privacy explanation

Audio compression is often used on recordings that include conversations, meetings, or interviews. Keeping the job local makes it easier to handle those files without relying on a hosted upload service.

Things to keep in mind

  • Very aggressive compression can introduce obvious artefacts, especially on music, ambience, and dense high-frequency content.
  • Shrinking speech files is usually easier than shrinking music files to the same quality standard.

Frequently asked questions