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Merge FLAC

Combine FLAC audio files in Your Own Order

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*Files deleted after 24 hours

Convert up to 1 GB files free, Pro users can convert up to 100 GB files; Sign up now

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How to Merge FLAC Files

1 Upload every file you want combined — at least two of them.
2 Drag the uploaded items into the order you want; the order is taken from the list, not from the filenames.
3 Start the merge, which joins matching inputs without re-encoding them and reconciles mismatched ones exactly once.
4 Download the single combined FLAC file.

Merge FLAC FAQ

Does it matter if the inputs are different formats?
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It does. FLAC is lossless compression — bit-identical to the source on decode, at about half the size of WAV. Matching inputs take a fast, lossless path; mismatched ones have to be reconciled to a common format, which is slower and costs one encode.
Yes — FLAC decodes bit-identically to the source, so any number of edit-and-resave cycles cost you nothing in fidelity. That is worth checking when the inputs did not all come from the same source.
On the free tier a merge accepts two files at a time, which is deliberately higher than the single-file limit on other tools because merging one file is meaningless. A pass removes the cap entirely.
It is whenever the inputs already agree — the encoded data is copied straight through. It stops being lossless only when the inputs disagree and something has to be re-encoded to make them compatible, and even then it is one pass, not one per file.
Yes, though lossless files are large, so the batch is bound by upload bandwidth rather than by processing. Settings apply uniformly across the set.
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.
No. Merge 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.
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.
PNG.to is built around the format you use when you cannot afford to lose a pixel: lossless, alpha-capable, and the correct answer for screenshots, logos, line art and anything with hard edges. Image work is rarely one step: people arrive to change a format and leave needing the picture a different size, a different weight or a different shape. Running Merge FLAC on the same upload pipeline, the same size caps and the same account is the whole reason it is here rather than on a fourth tab.
The converter on this site moves images to and from PNG, JPG, WebP, GIF and SVG — which is the step where the decision about transparency actually gets made. That is the step most people actually came for, and doing it after Merge FLAC rather than before it means the conversion works from the file you finally settled on.
The engines are shared — the same libraries, the same workers, the same limits. What differs is the advice, and the advice here starts from one fact about the format this site is named after: there is no quality slider to get wrong — a PNG round-trips bit-exactly, so the only thing edits cost you is file size. A PNG site is opinionated about where PNG is the right destination and where it is not, and that judgement is worth more than the button.
No account, and nothing is kept: uploads are deleted from the workers shortly after the job finishes, and nothing you process is indexed, listed or used for anything else. Free accounts exist for history and batch size, not for access.

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