Fusionneur Audio

Combine multiple audio files into one track

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library_music

Drop audio files or click to upload

MP3, WAV, OGG, FLAC, AAC · max 100 MB each · max 10 min each

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À propos de cet outil

Joining audio files sounds trivial and has one detail that decides whether the result is usable: what happens at the joins. Files recorded at different times, on different equipment, or at different levels do not simply become one track - the transition is audible as a jump in volume or tone. That is why a podcast intro recorded in a studio and a segment recorded on a laptop never quite blend, no matter how precisely they are stitched. Two habits solve most of it. Match levels before merging rather than after, since fixing a merged file means adjusting the whole thing. And check the join points specifically: a fraction of a second of silence at the end of each clip is far less jarring than a cut mid-breath. The files also need to end up at the same sample rate, which the merge handles by resampling where necessary. Merging runs in your browser, with a server fallback only for formats it cannot decode locally.

Comment utiliser cet outil

  1. Add your audio filesRead locally in your browser. Only an unsupported codec falls back to server processing.
  2. Put them in orderThe merged track follows the order shown on screen, top to bottom.
  3. MergeThe files are decoded, joined and re-encoded as one continuous track.
  4. Listen to the joinsThat is where problems appear - a level jump or an abrupt cut is obvious at the transition and nowhere else.

Pourquoi l’utiliser

  • Runs in your browser, so recordings and interviews stay on your device.
  • Handles files of different formats and sample rates without manual conversion first.
  • Order is under your control before anything is generated.
  • Original files untouched, so a bad order costs nothing.
  • No account, no watermark and no file-count limit.

Usages courants

  • Combining a podcast intro, main segment and outro into one episode.
  • Joining a recording that was split across several files.
  • Assembling a compilation or mixtape from separate tracks.
  • Stitching together voice notes recorded at different times.
  • Merging narration segments for a video or presentation.

Conseils pour de meilleurs résultats

  • Match the volume of each file before merging. Levelling a merged track afterwards means adjusting everything at once.
  • Check the transitions, not the middle of each clip. Joins are where merged audio gives itself away.
  • Leave a fraction of a second of silence at the end of each file so cuts do not land mid-breath.
  • Merge in one pass rather than joining two files repeatedly - each re-encode costs a little quality.
  • If one file is much quieter, fix it with the Volume Booster first rather than accepting the jump.

Erreurs à éviter

  • Merging files recorded at very different levels, producing a track that jumps in volume at each join.
  • Adding files in the wrong order and only noticing after the merge.
  • Cutting a source file mid-word before merging, which makes the join sound abrupt.
  • Repeatedly merging two files at a time, compounding re-encoding loss with each pass.
  • Uploading confidential recordings to a server-based merger. This one processes locally.

Questions fréquentes

Yes - files are combined in the order you add them; reorder them before merging if needed.

Merging generally works across common audio formats, though for the most consistent results, using files with similar format/quality avoids any unexpected inconsistencies in the merged output.

They play back-to-back with no artificial gap inserted. If you want breathing room between segments, add a short silence to the end of each source file before merging.

Normally no - merging runs in your browser, so recordings stay on your device. Only a codec your browser cannot decode falls back to server processing, and that file is discarded afterwards.

Because the source files were recorded at different levels, and merging joins them without normalising. Match the levels first with the Volume Booster - correcting it after merging means adjusting the whole track at once.

Yes. They are decoded and re-encoded to a single consistent output, including resampling where the sample rates differ, so mixing MP3 and WAV sources works without converting them first.

Yes. Merger is free for normal use with no account required, and ToolBox does not add a watermark to your result.

Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.

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