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Bethemesh
Audio

Audio merger

Merge multiple audio files locally in your browser into one WAV without server upload.

  • Batch processing
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Audio fileDrop an audio file here or choose an option below.

Merge your audio files

Drop several audio files here, or select multiple files together (Ctrl/Shift).

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How does this tool work?

Merge several audio files into one continuous track directly in your browser. Files are concatenated one after another in the supplied order, then the result is generated as WAV without uploading the audio content.

The shared engine decodes each file, places the tracks end to end and produces one PCM WAV. This is sequential concatenation: tracks are not overlaid or mixed in parallel, and no crossfade is added automatically. The final duration therefore corresponds to the combined duration of the assembled segments. The list order determines playback order, so arrange files before applying the merge. Durations add without overlap. Native decoding uses one shared audio context and produces 16-bit PCM WAV; source sample rates may change. The FFmpeg fallback concatenates decoded audio and adapts audio characteristics. It does not combine artwork, track titles and chapter metadata into a music library. Every input must contain decodable audio; a recognized extension alone is insufficient. The combined preview is temporary until you apply the merge. Check joins for abrupt level or ambience changes before downloading.

How to use this tool

  1. Select the files

    Choose at least two audio files in the order in which they should be joined.

  2. Run the merge

    The engine processes the tracks locally and concatenates them without overlap.

  3. Save the WAV

    Download the final track and listen to the joins to confirm the sequence is right.

Audio merger — Calculation reference

T = t1 + t2 + … + tn

T, ti
Duration in seconds

Use cases

Build an episode

Join an intro, several sections and an ending into one continuous track.

Combine separate takes

Put recordings made at different times back to back without opening a full audio editor.

Prepare a workflow

Merge a file collection before normalization, conversion or download in Workspace.

Examples

Two consecutive takes

12 + 18 = 30. The second starts after the first, without intentional overlap or added transition silence.

Input

First clip 12 s, second clip 18 s

Result

30-second programme

Three presentation segments

Start positions are 0, 5 and 45 seconds. Reordering the list changes those positions without changing the summed duration.

Input

Introduction 5 s, narration 40 s, ending 7 s

Result

52-second programme

Tips and best practices

  • Merging places files one after another; it does not mix them simultaneously.
  • For smoother transitions, apply fades to clip edges before merging.
  • The current output is PCM WAV; use the audio converter afterwards for MP3, FLAC, OGG, M4A or Opus.

Sources and references

Frequently asked questions

Are the files mixed or simply placed end to end?

They are placed end to end. The current merge creates one continuous sequence and does not overlay multiple tracks.

Can I merge different audio formats?

The engine accepts Bethemesh-supported audio formats and decodes them before creating the WAV output. Available browser memory remains a practical limit for very large files.

Is a crossfade added between files?

No. No overlap is created automatically. Apply fades before merging if you want softer transitions.

Can I join a mono MP3 and a stereo WAV?

The engine can decode and adapt different sources before concatenation. Output channels and sample rate depend on the processing path; listen to the joins and inspect the result.

Are titles and chapters combined?

No. Merging creates one sequential sound programme. It does not automatically reconstruct chapters, a track list or artwork from input metadata.

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