Audio Joiner
Combine several recordings or songs into one continuous file. Put them in order, choose straight joins, pauses or smooth crossfades, and download a single track in the format you need.
- Files stay on your device
- No sign-up
- Free to use
Between tracks
Output
Processing happens on your device; your audio is not uploaded.
How to use Audio Joiner
- Drop the audio files you want to combine, up to 20.
- Drag files in the list to set the playing order.
- Choose a straight join, a pause between tracks, or a crossfade, and its length.
- Choose the output format, optionally even out loudness, then select Join files.
Audio Joiner features
Up to 20 files
Join chapters, songs or clips of any common format.
Drag to reorder
Set the sequence before joining.
Pauses and crossfades
Silent gaps or smooth crossfades from half a second to five seconds.
Mixed formats
Combine MP3, WAV, M4A, OGG and FLAC in one run; they are converted to a common format first.
Loudness evening
Optional EBU R128 loudness normalisation so no track is much louder than another.
On-device
Your files are never uploaded.
When to use Audio Joiner
- Combining audiobook chapters or lecture parts into one file.
- Making a continuous mix or playlist with crossfades.
- Joining voice memos recorded in several parts.
- Assembling podcast intro, episode and outro segments.
- Creating a single soundtrack from several music clips.
Audio Joiner FAQ
What is the difference between joining and merging?
Joining plays files one after another, in order. Merging plays them at the same time, for example voice over music. Use the Audio Merger for the latter.
How do crossfades affect the length?
During a crossfade the end of one track overlaps the start of the next, so the joined file is shorter than the sum of the tracks by the crossfade length at each join.
What does evening out loudness do?
Each track is adjusted to the same perceived loudness, measured in LUFS, so a quiet recording does not follow a loud one. It is useful for mixed sources.
Can I join files with different sample rates?
Yes. All files are resampled to 48 kHz stereo before joining.
Is the result lossless?
Choosing WAV or FLAC output keeps the joined audio lossless. MP3 and M4A are encoded at 192 kbps.
Joining audio seamlessly
Joining audio files looks simple, but files often differ in format, sample rate and channel layout. A mono 44.1 kHz voice memo cannot be appended directly to a stereo 48 kHz recording. This joiner converts every input to a common format first, then concatenates them, so any combination of common files can be joined.
Transitions shape how the result feels. Straight joins suit chapters and speech, where content already starts and ends cleanly. Short pauses help separate distinct segments such as podcast sections. Crossfades blend the end of one track into the start of the next, the approach used in DJ mixes and continuous playlists.
Recordings made on different devices rarely have the same loudness. Loudness normalisation measures the perceived loudness of each file according to the EBU R128 standard and adjusts it to a common target of −16 LUFS, a level suitable for podcasts and streaming.
For long projects, consider the output format. WAV and FLAC keep full quality for further editing; MP3 and M4A produce compact files for sharing and listening.