Merge Audio Files
Several recordings, one file, in the order you set.
Drop two or more audio files
They are joined top to bottom in the order of the list, which you can change.
Guide: Several recordings, one file2 min read
Several recordings, one file
Drop two or more audio files — MP3, WAV, M4A, OGG, FLAC, WhatsApp voice notes — put them in order with the arrows beside each one, and join. The result is one continuous file in MP3, M4A or WAV that plays in the preview before you save it. Useful for voice notes that belong together, chapters of an audiobook, a set of songs for a presentation or the parts of a recorded lesson.
A pause of one to three seconds can be put between the tracks so separate recordings do not run into each other; it goes between each pair, never after the last one.
Different sources, one sound
Recordings from different places rarely match: a phone memo is often mono at 16 or 48 kHz, a song is stereo at 44.1 kHz. Each track is converted to the same sample rate and to stereo before the join, which is what keeps a voice from speeding up or a song from dropping in pitch at the seam. To trim the silence at the start of a recording first, use trim audio.
Nothing is uploaded
The join is done by ffmpeg running in this tab. The engine is downloaded from this site once and kept, and the recordings never leave your device. To change the format of the finished file, the audio converter takes it next.
Frequently asked questions
Can I join files of different formats?
Yes. An MP3, a WAV and a phone voice memo can go into the same file: each is brought to the same sample rate and stereo before joining, which is what lets recordings from different devices sit together without a jump in speed or pitch.
How do I change the order?
Use the arrows beside each file in the list. The tracks are joined top to bottom, and the preview plays whichever file is selected so you can check you have the right one before converting.
Can I add silence between the tracks?
Yes: choose a pause of one, two or three seconds and it is placed between each pair of tracks, not after the last one. It helps when joining separate voice notes or chapters that would otherwise run into each other.
Is there a limit on how many files?
Only your device's memory: every file is held in the tab while it is joined. A few dozen songs work on a laptop; on a phone, join an album in two halves if it struggles.
Are the recordings uploaded?
No. ffmpeg joins them inside this tab. The engine is downloaded from this site once and kept; the audio never leaves your device.