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Why this runs on your computer

There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Drop your file hereto load the tools

Nothing is uploaded — the tools run right here

Applies to every loaded image

Look Strength 100% Brightness Contrast Saturation Vibrance Vignette

Max width Format Shape

Shape Size Across Down Border

Text Where

100%

Convert AAC to FLAC without uploading it

Turn a AAC file into FLAC — here in this tab, with nothing uploaded.

How to convert AAC to FLAC

Drop your AAC file in.
Choose FLAC as the output.
Save the FLAC file.

Why this one stays private

Audio files are voice memos, interviews, recordings of people. Converting one elsewhere means uploading all of that.

Questions

Why convert AAC to FLAC?

AAC is the modern lossy format, better than MP3 at the same size. FLAC is lossless but compressed, so it keeps the quality without the bulk. Converting is how you move a file from the first situation to the second.

Which format should I pick?

MP3 to be sure it plays. FLAC or WAV when nothing may be lost.

Can I convert several at once?

Yes — drop them all in and they are handled together.

How to convert AAC to FLAC

Why this one stays private

Questions

The same tool, other formats