Merge MP3 files into one track
Audiobook chapters split across files, podcast takes recorded separately, a playlist that should have been one long mix — joining MP3s without gaps or re-encoding damage used to mean desktop software. Drop your files below, arrange them with ↑ ↓, and merge into one seamless track in MP3, WAV, or FLAC. Mixed sample rates are resampled automatically; everything happens locally.
How to merge MP3s
- 1Drop 2+ audio files on the joiner above. Each decodes and shows its length instantly.
- 2Order them with ↑ ↓. Top plays first. Remove strays with × — the total runtime updates live.
- 3Hit Join tracks and download one gapless file in your chosen format.
Seamless merges
Mind the joints
Files recorded in one session join invisibly. Different recordings may click at joints — trim silence off ends first with our trimmer.
Mixed formats are fine
MP3, WAV, FLAC, and OGG parts mix freely — different sample rates are resampled automatically to match.
Audiobooks love this
Join chapters into part files, or everything into one file for car stereos that forget playback position.
Frequently asked questions
How do I merge MP3 files?
Drop them above, order with ↑ ↓, hit Join tracks. The parts concatenate gaplessly into one MP3 (or WAV/FLAC) download.
Is there a limit on files or length?
Up to 30 parts and about an hour total — plenty for chapters, episodes, and mixes. Longer? Join in batches, then join the batches.
Will there be gaps or clicks between parts?
No added gaps — concatenation is sample-exact. Clicks only appear if the source files themselves end/start abruptly; trim silence first if so.
Can I mix MP3, WAV, and FLAC parts?
Yes — everything decodes to raw audio first, sample rates are unified automatically, then the mix encodes to your chosen output.
Are my files uploaded?
No. Decoding, joining, and encoding run 100% in your browser.