Audio merger
Arrange and merge audio clips into one MP3 or WAV file. Decoding, joining and encoding happen entirely in your browser.
Runs in your browser
Pick two or more audio clips. You can add files in more than one selection.
MP3 is lossy, so every source is encoded into a new compressed file.
The clips are decoded, joined and encoded on this device. They are not uploaded.
Join clips in the order you choose
Add two or more audio files, then use the arrow buttons to set their order. The end of each clip is placed directly beside the start of the next one; the Tool does not insert a pause, fade or crossfade. You can add the same file twice when it needs to repeat.
The browser decodes every source into a 44.1 kHz working buffer before joining it. Matching channel layouts are preserved. When mono and stereo clips are mixed, mono is copied to both stereo channels rather than playing from only one speaker. Mixed multichannel layouts are folded to stereo because their speaker positions cannot be inferred reliably from every container.
MP3 or WAV output
MP3 makes a smaller file for sharing and ordinary playback. It is lossy: every source is encoded into a new compressed file, even when the input was already MP3.
WAV stores the joined working samples as uncompressed 16-bit PCM. It avoids another lossy pass, but is usually much larger. A source recorded at another sample rate has still been resampled while the browser decoded it.
The MP3 quality control uses LAME’s VBR scale, where 0 is the best and largest and 9 is the smallest and lowest quality.
Your audio stays on the device
The source files are read, decoded, arranged and encoded in this page. Nothing is uploaded. The decoded-memory figure shows why long or numerous compressed clips can need much more memory than their file sizes suggest.