Audio Compressor
Compress audio files
Reduce audio file size by re-encoding to lossy formats at your chosen bitrate, or target a specific file size. Everything happens in your browser — no uploads, no servers.
Drop your audio file here
or drop a folder for batch compression
WAV · FLAC · MP3 · AAC · OGG · M4A · AIFF
Audio compression in this context refers to reducing the file size of an audio file, not changing its dynamic range. This is done by re-encoding the audio into a lossy format (like MP3, OGG, or AAC) at a lower bitrate. The encoder removes audio data that is less perceptible to human hearing, resulting in a smaller file. A WAV file at 1411 kbps can be compressed to a 128 kbps MP3 with roughly a 10x reduction in file size, while still sounding good to most listeners.
Lossy compression (MP3, OGG, AAC) permanently removes some audio data to achieve smaller file sizes. The removed data is chosen to be less audible to human ears, but it cannot be recovered. Lossless compression (FLAC, ALAC) reduces file size without losing any audio data — like a ZIP file for audio. The original audio can be perfectly reconstructed. This tool focuses on lossy compression since it achieves much greater file size reductions (typically 5-15x smaller vs 2-3x for lossless).
The right bitrate depends on your use case:
320 kbps: Near-transparent quality. Hard to distinguish from the original. Best for music archiving or critical listening.
256 kbps: Excellent quality. Great balance of size and fidelity for personal music libraries.
192 kbps: Very good quality. Suitable for most music listening. Most people cannot tell the difference from higher bitrates.
128 kbps: Good quality. Standard for podcasts, audiobooks, and casual music listening. Noticeable quality loss on complex music.
96 kbps: Acceptable quality. Good for speech content, voice recordings, and when file size is a priority.
64 kbps: Lower quality. Suitable for speech-only content or very constrained bandwidth situations.
When in doubt, 128 kbps is a safe general-purpose choice, and 192 kbps is recommended for music.
320 kbps: Near-transparent quality. Hard to distinguish from the original. Best for music archiving or critical listening.
256 kbps: Excellent quality. Great balance of size and fidelity for personal music libraries.
192 kbps: Very good quality. Suitable for most music listening. Most people cannot tell the difference from higher bitrates.
128 kbps: Good quality. Standard for podcasts, audiobooks, and casual music listening. Noticeable quality loss on complex music.
96 kbps: Acceptable quality. Good for speech content, voice recordings, and when file size is a priority.
64 kbps: Lower quality. Suitable for speech-only content or very constrained bandwidth situations.
When in doubt, 128 kbps is a safe general-purpose choice, and 192 kbps is recommended for music.
Yes, lossy compression always removes some audio information. However, modern codecs (MP3, OGG Vorbis, AAC) are very good at removing only the least perceptible parts of the audio. At higher bitrates (192+ kbps), most listeners cannot tell the difference from the original. At lower bitrates, you may notice artifacts like a slight loss of high-frequency detail, pre-echo on transients, or a slightly "watery" quality. The best approach is to use this tool's preview feature to compare the original and compressed versions before downloading. If you can hear a difference, try a higher bitrate.
The Audio Converter focuses on changing between audio formats (e.g., FLAC to WAV, MP3 to OGG) and gives you control over format-specific settings. The Audio Compressor is specifically designed to reduce file size — it provides a simpler workflow focused on bitrate selection, file size targeting, and before/after size comparison. Think of the Converter as a format tool, and the Compressor as a size-reduction tool. Both use the same underlying encoding technology, but the Compressor makes the "how small can I make this?" workflow faster and more intuitive.
In Target File Size mode, you specify the desired output size in megabytes, and the tool automatically calculates the bitrate needed to achieve that size. The calculation is based on your audio's duration: bitrate = (target size in bits) / duration in seconds. The actual output file may be slightly larger or smaller than the target because lossy encoders use variable bit allocation — complex passages use more bits than simple ones. If the calculated bitrate is extremely low (below 32 kbps) or very high (above 320 kbps), the tool will warn you. This mode is useful when you have a specific file size limit, such as email attachment limits or platform upload restrictions.
Yes. All audio processing happens entirely in your browser. Your file is decoded, compressed, and re-encoded locally on your device. Nothing is uploaded to any server. The compressed file is downloaded directly to your computer.
The Audio Converter changes the format of your file (e.g., WAV to MP3). The Audio Compressor focuses specifically on reducing file size — you set a target bitrate or target file size, and the tool re-encodes your audio to meet that goal while preserving as much quality as possible.