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Free · In-browser · No upload

Audio Joiner.

Drop in as many files as you like, put them in order, choose a crossfade and merge everything into a single track.

Before-and-after illustration of Audio Joiner: Multiple audio files becomes Joined track through Order and crossfade.
Before → process → afterSee the signal story, then hear it in the workspace.

TIMELINE MAP

Track Join Sequence

Turn one long waveform into deliberate boundaries. The visual emphasizes the selection, transition and resulting edit so that timing decisions remain obvious before anything is rendered.

Before-and-after illustration of Audio Joiner: Multiple audio files becomes Joined track through Order and crossfade.
Multiple audio filesOrder and crossfadeJoined track
A timeline edit: marked regions, handles and transitions resolve into clean finite segments without hiding where each boundary came from.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
  1. Multiple audio files

    Start with the right material

    Combining voice notes, podcast sections, music demos or sequential sound effects.

  2. Order and crossfade

    Understand the transformation

    Every clip is decoded by the shared browser AudioContext, then the decoded buffers are concatenated or crossfaded in memory at that runtime rate.

  3. Joined track

    Verify the usable result

    One continuous rendered file in the chosen order.

Join seams

Where this workflow stops

Browser decoding can resample source files before the joiner receives them, and the tool does not beat-match or loudness-match clips automatically. Large batches need more memory.

THREE-PASS CHECK

Make the final decision by ear

  • Zoom into every boundary and listen across it, not only inside it.
  • Leave intentional handles when another editor will continue the work.
  • Verify exact duration and ordering after the final render.

How to join audio files online

  1. Drop several audio files into the upload box at once — you can keep adding more later.
  2. Arrange the queue with the up/down buttons and remove anything you do not need; each row shows the track's length.
  3. Set an optional crossfade (0–3 seconds) between tracks.
  4. Press Merge tracks, preview the combined result, then download it as MP3 or WAV.

This audio joiner and merger turns a folder of separate clips into one continuous file: voice memo fragments into a single note, podcast segments into an episode, favorite songs into a workout mix, or sound effects into one cue. Mixed formats are fine — everything is decoded and resampled to a common rate before being stitched together, and the optional crossfade smooths each seam so the result sounds intentional rather than spliced.

Files are merged on your device and are not uploaded to AudioWrench. There is no signup or watermark; input count, decoded size, browser memory and codec support impose practical limits. Need to tidy a clip before joining? Cut it down with the Audio Trimmer first, then drop the pieces here.

Audio Joiner: quick answer and technical limits

Quick answer: A local audio joiner that places uploaded clips in order and can overlap neighboring files for a crossfade.

Best for
Combining voice notes, podcast sections, music demos or sequential sound effects.
How it works
Every clip is decoded by the shared browser AudioContext, then the decoded buffers are concatenated or crossfaded in memory at that runtime rate.
What you get
One continuous rendered file in the chosen order.

Know before you use it: Browser decoding can resample source files before the joiner receives them, and the tool does not beat-match or loudness-match clips automatically. Large batches need more memory.

Public browser workflow evidence

Question: Can the real UI reorder two decoded files, apply a 100 ms crossfade and export the expected sequence, duration and AudioContext-rate WAV?

Observed result: After the visible reorder and 100 ms crossfade, the 1.7-second WAV followed the 660→330 Hz sequence at 48,000 Hz (163,244 bytes).

Evidence boundary: This case covers two mono inputs, one reorder and one crossfade. Chromium decodes both source rates to its AudioContext rate before the joiner sees them; larger queues, channel expansion and clipping control remain outside this wave.

Network observation: No audio-payload or cross-origin requests were observed during this published workflow.

Open the public benchmark, method and fixture →

Privacy: Selected audio is processed in this browser and is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Privacy details →

FAQ

Can I merge audio files of different formats and sample rates?
Yes. You can mix MP3, WAV, FLAC, OGG, M4A — anything your browser decodes — in one queue. Every file is automatically resampled to the sample rate of the first track before merging, so the joined result plays at a consistent speed and pitch.
How do crossfades between tracks work?
A single slider sets a crossfade of up to 3 seconds that is applied between every pair of neighboring tracks: the end of one fades out while the start of the next fades in. Set it to 0 for hard cuts; it is also automatically capped so it can never exceed half of your shortest track.
Is there a limit on how many files I can join?
There is no fixed file count or duration cap. The practical limit is your device's memory, because all tracks are decoded to raw audio before merging — joining dozens of full-length songs may get slow on phones, while shorter clips are no problem at all.
Is the audio joiner free, and do my files get uploaded?
It is free with no account. The selected files are decoded, merged and crossfaded on your device and are not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. The merged track downloads as a 320 kbps MP3 or WAV.