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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 audio hereto join them

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

Colours 6 Detail 1 Smooth curves

Shape Size Across Down Border

Text Where

100%

Merge AAC files into one, without uploading them

Join several AAC audio files into one AAC - here in this tab, with nothing uploaded.

How to merge AAC files

Drop your AAC files in.
Put them in order with the arrows.
Press Join and save the AAC file.

Why this one stays private

Joining recordings means every one of them has to be in one place. That place should be your own computer.

Questions

Can AAC files be merged without re-encoding?

Yes, when they match - files from the same camera, recorder or export usually do. They are joined as they are and saved as AAC, which is fast and loses nothing. Files that differ are re-encoded so they fit together.

Do the tracks need the same format?

No. Matching tracks are joined without re-encoding; mixed ones are converted to match first. Pick the format to save the result in.

Can I reorder them?

Yes - use the arrows beside each track before joining.

How to merge AAC files

Why this one stays private

Questions

The same tool, other formats