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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 M4A to MP3 without uploading it

Turn a M4A file into MP3 — here in this tab, with nothing uploaded.

How to convert M4A to MP3

Drop your M4A file in.
Choose MP3 as the output.
Save the MP3 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 M4A to MP3?

M4A is the Apple container for AAC, and what iTunes and Voice Memos produce. MP3 is the format that plays on absolutely everything. 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 M4A to MP3

Why this one stays private

Questions

The same tool, other formats