Flimpa

Merge Audio

Concatenate multiple tracks into one MP3 in order.

Upload 2–10 files (MP3, WAV, M4A, FLAC; each up to 10 MB) and download one MP3 (libmp3lame V2). Tracks are appended in upload order — not mixed on one timeline. Loudness is not normalized between files.

Security and privacy

  • Encryption at rest

    Files are encrypted during storage with AES-256-GCM using a unique key per file

  • Auto-deletion

    Uploaded and processed files are removed after the session ends

  • Temporary sessions

    Processing sessions expire automatically and are not kept as a permanent archive

  • Protected download links

    Downloads require a short-lived access token — not a public permanent URL

Recommended tools

Trim Audio

Cut a continuous segment by start and end time.

Change Volume

Adjust loudness with uniform dB gain.

WAV to MP3

Convert a WAV file to MP3.

FAQ

Yes. Tracks are re-encoded into one MP3 in the upload order.

No, the volume and dynamics of each track are saved without automatic normalization. If the source files sound at different levels, the resulting transitions will also vary in volume.

An error is possible if one of the files is corrupted, does not contain a supported audio stream, or the total request size is too large. Check each file separately and combine it in smaller groups if necessary.

Yes. Files are transferred over a secure connection, encrypted while stored on the server, and automatically deleted. Flimpa does not store documents permanently and does not use them to train models.