Audio Compressor
Compress MP3, WAV, M4A, FLAC, and other supported audio files directly in your browser. Choose a quality preset when you want a simple size-and-quality balance, or set a target file size when the final number of megabytes matters. Your source media stays on your device.
Drop a file into the audio compressor
Drag and drop or click to choose. This audio compressor processes everything locally — max 500MB.
MP3, WAV, AAC, FLAC, OGG, M4A, Opus, MP4, MOV, WebM
Detecting encoder support…
No file? Try a sample in another format
Click to load a short MP3, WAV, FLAC, MP4, or other sample and test the available compression settings
How to Compress an Audio File
Add an audio or video file
Choose an audio file or a compatible video up to 500MB. The browser decodes the media locally and shows a waveform so you can confirm that you selected the right track. Processing time depends on the file duration, codec, device, browser, and output settings, but your source does not need to be uploaded to Pixwit’s servers.
Choose quality or a target file size
Select High, Balanced, or Small when you want a straightforward trade-off between sound quality and output size. If you need to meet an attachment, upload, or storage limit, enter a target size instead. Then choose an available MP3, AAC, or Opus output and let the tool determine an appropriate bitrate for the selected mode.
Compress, review, and download
Start compression and download the smaller file when processing finishes. Compare the result with the original size and listen to the output when sound quality matters. If the result is still too large, choose a smaller target or stronger compression; if it sounds too degraded, move back toward a higher-quality setting and try again.
Audio Compression Features
Private browser processing
Encoding runs locally with browser media technology, so recordings, mixes, podcasts, and voice memos remain on your device instead of being sent to Pixwit for compression. This is useful when you want a quick file-size reduction without first transferring the source media to a remote service.
Quality presets or target size
Pick High, Balanced, or Small for a simple compression choice, or set a megabyte target when you need to stay below a particular file-size limit. Target mode searches for a bitrate that fits the requested size, while presets make it easier to choose a general quality-versus-size balance.
Extract audio from video
Drop a compatible MP4, MOV, or WebM file when the sound you need is inside a video. The tool can extract the audio track and encode it to a smaller supported audio format, which is useful for narration, interviews, screen recordings, presentations, and other clips where you only need the sound.
Made for everyday audio files
Use compression for voice recordings, podcast drafts, music previews, mobile sharing, web audio, or files that need to fit an upload or attachment limit. Keep the original high-quality source whenever you may need to edit, master, archive, or re-encode the audio again later.
How Audio Compression Reduces File Size
Audio file size is shaped by duration, codec, bitrate, sample rate, channel count, and whether the format stores sound with lossy or lossless compression. Reducing size is therefore a trade-off: the right settings depend on what the recording contains and how you plan to use the downloaded file.
Bitrate, codec, and duration matter
For compressed audio, bitrate is one of the clearest controls over file size: a lower bitrate usually creates a smaller file, while a higher bitrate preserves more information. Duration matters as well because a longer recording contains more audio to store. The codec determines how efficiently that information can be represented, so files of the same length can differ substantially in size even when they sound similar.
Lossy and lossless compression solve different problems
MP3, AAC, and Opus use lossy compression, which can remove some audio information to reduce size. They are practical for listening copies, speech, podcasts, web playback, and sharing when compact files matter. FLAC is lossless and is designed to preserve the original audio information while compressing it more efficiently than uncompressed PCM. A dramatic reduction from WAV or FLAC generally requires moving to a lossy delivery format.
Choose compression based on the content
There is no single best setting for every recording. Spoken voice may remain understandable at stronger compression than detailed music, while a master recording or archive should usually be preserved in its original high-quality form. For everyday sharing, start with a moderate quality setting, listen to the result, and only compress more aggressively when the smaller size provides a real benefit.
Use target size when the limit matters most
A target-size workflow is useful when another service imposes a hard upload or attachment limit. Instead of guessing a bitrate, specify the size you need and let the tool search for an encoding setting that fits. The tighter the target relative to the recording duration, the more compression may be required, so always check the resulting sound when quality is important.
Compress MP3, WAV, M4A, FLAC, and Other Audio
Make MP3 files smaller
MP3 already uses lossy compression. To reduce an MP3 further, the audio normally needs to be encoded at a lower bitrate or with more aggressive settings. This can be useful for voice recordings, previews, mobile sharing, and other cases where a smaller transfer matters more than preserving every detail.
Reduce WAV file size
WAV files often contain uncompressed PCM audio and can be much larger than compressed delivery formats. When the goal is sharing rather than editing or archival quality, create a smaller MP3, AAC, or Opus copy. Keep the original WAV if you still need a high-quality source for production work.
Compress M4A and AAC audio
M4A commonly contains efficiently encoded AAC audio and may already be relatively compact. Further reduction is useful when you need to meet a specific storage or upload limit, but aggressive compression can still introduce audible changes. Start conservatively when the recording contains music or other detail-rich material.
Understand FLAC compression
FLAC is already a lossless compressed format, so reducing it dramatically while preserving exactly the same audio information is more limited than compressing an uncompressed source. Pixwit can re-encode supported lossless input to a smaller lossy output. Preserve the original FLAC whenever lossless quality or future editing matters.
Audio Compression FAQ
Related tools
Compress Your Audio File
Return to the tool above, choose a quality preset or target file size, and create a smaller audio file directly in your browser.