1Drop your audio files into the box above, or pick them from your device — there is nothing to install and no account to create.
2Choose how hard to squeeze: a target bitrate, and optionally mono or a lower sample rate when size matters more to you than fidelity.
3Start the job and let the workers re-pack the file; your original is never modified in place.
4Compare the new size against the original, then download the compressed Audio file.
Compress Audio FAQ
How does Compress Audio actually make the file smaller?
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Concretely, lossless sources are moved to compressed lossless where that is enough, and lossy sources are re-encoded to the bitrate you set, so nothing is needlessly put through a second generation. Nothing about it depends on you installing software: the job runs server-side and hands back a finished file.
How much smaller will my file get?
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That is decided by the material and the bitrate you target, not by the tool. Speech, podcasts and sparse acoustic recordings stay clean at a low bitrate and shrink dramatically; dense music, applause and cymbals need far more to survive intact. Halving the bitrate roughly halves the file, and taking a spoken-word recording to mono halves it again.
Does the format of my file change how much I can save?
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Very much so. this format is read and written by the same streaming pipeline as everything else we support. That determines both the headroom available and whether the saving costs you anything in fidelity.
Is there anything specific to Audio I should know before compressing?
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Yes — the codec is detected from the stream, so a mislabelled extension does not derail the job. It is worth knowing before you overwrite an original you might need again.
What is the most common mistake when compressing audio files?
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Compressing the same file repeatedly. Each pass on a lossy format is a fresh generation of loss and the savings shrink while the damage accumulates. Go from the original to your target in one step, and keep the original.
What do I get back, and can I control the trade-off?
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A single compressed file per input, at a bitrate you choose rather than a fixed default. If it is still too large, taking a spoken-word recording to mono or to a lower sample rate does more than shaving the bitrate any further.
Which audio formats does Compress Audio accept?
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MP3, WAV, AAC, M4A, FLAC, OGG, Opus, WMA and AIFF. Codecs are detected from the stream rather than the extension, so a mislabelled file still works and a mixed batch is handled per file.
Is there a file size limit on Compress Audio?
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Yes: free accounts process audio up to 200 MB per file whichever codec you brought; ffmpeg handles the decode and encode. In practice that limit only bites on uncompressed WAV; a compressed file of the same length is nowhere near it.
Will Compress Audio lower the quality of my audio files?
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It depends on the source. Lossless input (WAV, FLAC, AIFF) is edited sample-exactly and loses nothing. Lossy input has already discarded detail once, so where the job can be done by copying the encoded stream rather than re-encoding it, that is the path taken.
Can I run Compress Audio on several audio files at once?
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Yes. The set queues in parallel with identical settings, which is how you process an album or a podcast back catalogue without repeating yourself.
Do tags and cover art survive?
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Yes — ID3, Vorbis comments and MP4 atoms are carried across along with embedded artwork, so processed files still sort correctly in a music library.
Does Compress Audio cost anything?
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No. Compress Audio is free with no account, and nothing is added to the audio. Uploads are deleted from the workers shortly after the job completes.
