1Drop your FLAC 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 FLAC file.
Compress FLAC FAQ
How does Compress FLAC actually make the file smaller?
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Concretely, you either stay lossless and move to a compressed lossless codec, which is free in fidelity terms and roughly halves the size, or you accept a lossy target for a much larger reduction; the tool makes that a choice rather than an assumption. 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. FLAC is lossless compression — bit-identical to the source on decode, at about half the size of WAV. That determines both the headroom available and whether the saving costs you anything in fidelity.
Is there anything specific to FLAC I should know before compressing?
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Yes — FLAC decodes bit-identically to the source, so any number of edit-and-resave cycles cost you nothing in fidelity. It is worth knowing before you overwrite an original you might need again.
What is the most common mistake when compressing FLAC 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.
What can I upload to Compress FLAC?
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WAV, FLAC and AIFF, at any bit depth and sample rate up to and including 24-bit/192 kHz. Lossy files work in the same batch if you are mixing sources.
Is there a file size limit on Compress FLAC?
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Yes: free accounts process audio up to 200 MB per file — for uncompressed PCM that is roughly twenty minutes of CD-quality stereo, so it is a real limit here in a way it is not for MP3. If you are over it, converting WAV to FLAC first is the free fix — it is lossless and roughly halves the size.
Will Compress FLAC lower the quality of my FLAC audio files?
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No. Lossless audio is edited sample-exactly, so what comes back decodes bit-identically to what you would get doing the same edit in a desktop editor. You can repeat the cycle as many times as you like without accumulating any loss at all.
Can I run Compress FLAC on several FLAC audio files at once?
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Yes, though lossless files are large, so the batch is bound by upload bandwidth rather than by processing. Settings apply uniformly across the set.
Are bit depth and sample rate preserved?
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Yes, unless you change them deliberately. A 24-bit/96 kHz source stays 24-bit/96 kHz — nothing is silently downsampled to 16/44.1, which is the failure mode that makes a master unusable.
Does Compress FLAC cost anything?
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No. Compress FLAC is free with no account required, and nothing is added to the audio. Uploads are deleted from the workers shortly after the job finishes.
