.AUP File Extension (Audacity Project File)

Audiodrome | Last Updated: March 12th, 2026 | 5 min read | Glossary

The .AUP file extension is the older Audacity project format used to save an editing session, not a finished audio export. It matters because an AUP file stores project structure and edit decisions, but in older Audacity workflows it depended on separate project data, so moving or sharing it incorrectly could break the session.

Quick facts:
Also called: AUP file, Audacity project file
Applies to: older Audacity project sessions, non-destructive editing workflows, and session recovery/organization
Separate from: WAV, MP3, FLAC, exported audio files, and newer .aup3 project files
Common uses: saving edit sessions, reopening multitrack work, preserving cuts and effects, continuing unfinished projects
Often handled by: editors, podcasters, music producers, Audacity users, and archivists

Example:
A podcaster edits an interview in an older version of Audacity and saves the work as an .aup project. When they reopen it later, the file restores the session layout, edits, and effect settings, but the project only works properly if the linked audio data is still present in the expected folder structure.

Gotchas:

  • An .aup file is not the same as an exported audio file. You cannot treat it like a finished WAV or MP3 deliverable.
  • Older AUP projects often relied on separate project data, so copying only the .aup file could leave the session unusable on another machine.
  • Newer Audacity versions use .aup3, which replaced the older project-and-data-folder structure with a single-file project format.
  • Users often confuse “save project” with “export audio.” Saving preserves the editable session; exporting creates the playback-ready file.

FAQs

No, you can’t convert an .AUP File Extension directly. You need to open the project in Audacity and then use File → Export to create a standard audio file like .MP3, .WAV, or .FLAC. The .AUP file itself doesn’t contain the audio – it only stores editing instructions.

You must have both the .AUP File Extension and the matching _data folder. Place them in the same directory, ensure their base names match, and open the .AUP file using the same or a compatible version of Audacity.

Sometimes. Audacity may create temporary autosave files. After reopening the program, it might prompt you to recover the project. If not, check the temporary folder listed under Preferences → Directories.

No. Audacity and .AUP files are not supported on mobile platforms. You need a desktop version of Audacity (Windows, macOS, or Linux) to open and edit .AUP projects.

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Related terms:
Audacity • DAW File • Data File • Auto-Save • Audio Editing • Export Audio • File Format