Merge Audio Files Online for Free
FreeCombine multiple audio files into one track. Drag to reorder segments, add crossfade between clips, and export in any format. Free, browser-based, no upload.
What's next
Settings guide
Assembly order:
Drag files into the order they should play. The first file listed plays first; the last listed plays last. Review the order before merging — reordering afterwards requires re-merging.
Crossfade options:
- ·No crossfade (hard cut) — Clips are concatenated end-to-start. Use for invisible edits within a continuous recording, or when each clip starts and ends at silence.
- ·Crossfade 0.5–1 second — Short overlap. Suitable for transitions between speech segments where a brief blend sounds natural.
- ·Crossfade 2–5 seconds — Standard for music transitions. The end of one track fades out as the next fades in. Common in DJ mixes and podcast music beds.
Format matching:
For cleanest results, ensure all input files have the same sample rate (all 44.1 kHz, or all 48 kHz) and the same number of channels (all stereo or all mono). Mixing sample rates requires resampling, which is handled automatically but adds a processing step.
Volume matching before merging:
Normalise each segment separately before merging if they were recorded at different levels. Merging recordings with mismatched volumes produces a noticeably uneven result that listeners find jarring.
Format comparison
Merge vs Overlay (Mixing): Merging joins files end-to-end — sequential playback. Mixing combines files so they play simultaneously — multiple audio streams at the same time (voice over music, for example). This tool merges (sequential); a full DAW is needed for multi-track mixing.
Merge then normalize vs normalize then merge: Normalising individual clips before merging gives you control over the relative balance between segments. Normalising the merged file sets the overall level but cannot fix imbalances between segments that were at very different levels. Normalise individual clips first when consistency between segments matters.
Number of files: There is no hard limit on how many files you can merge in a single operation. Practically, merging 20–30 audio clips (a full podcast episode's worth of segments) runs without issues on most modern browsers. For very large batches (100+ clips), process in groups and merge the groups.
How it works
Upload files
Drop two or more audio files. Any supported format — MP3, WAV, FLAC, OGG, AAC.
Arrange order
Drag segments into the playback sequence. The top file plays first.
Set crossfade
Choose a crossfade duration between each transition, or keep as hard cuts.
Merge and download
Export the merged audio in your chosen format. All processing is local.
About this format
Merging audio files means joining multiple separate recordings into a single continuous track. The order you assemble them determines the listener's experience — a podcast with the intro before the main content, a DJ set with tracks in the planned sequence, an audiobook chapter assembled from separately recorded segments.
The most common scenario is podcast assembly: a 3-second intro music clip, 25 minutes of recorded content split across two takes, and a 5-second outro. These might be five or six separate files that need to become one. Each needs to be in the right position, the join between them needs to be clean, and the volume levels need to be consistent throughout.
A clean join between two audio clips depends on whether the transition is intentional or invisible. For an intentional transition (music fading into speech), a crossfade overlaps the tail of clip 1 with the head of clip 2, blending them together. For an invisible edit (two takes of the same recording), the join should be cut at a natural pause or breath — with matching background noise levels — and no crossfade.
This tool handles the sequencing and joining. Volume consistency (normalization) and noise consistency are separate concerns that are best addressed before merging by processing each clip individually.