Join Audio Files Online — Merge MP3 & Audio Files

Use this free online audio joiner to combine multiple MP3 and audio files into one continuous track. Add between two and five files, drag them into playback order, and download one merged MP3. It works well for combining songs, podcast sections, interview recordings, voice memos, audiobook chapters, and separate music or narration clips.

The audio merger supports MP3, WAV, M4A, AAC, OGG, FLAC, and WebM audio. Processing happens locally with FFmpeg WebAssembly, so your recordings are not uploaded to a server, stored in the cloud, or added to a processing queue.

How to combine MP3 and audio files

Choose your files or drop them onto the page. Review each filename, format, duration, and size, then drag the rows into the sequence you want. The merged track plays each complete file from beginning to end in that exact order.

When all inputs are compatible MP3 files, the tool first attempts a fast merge without re-encoding. Mixed formats or MP3 files with different codec settings are converted to a consistent 192 kbps, 44.1 kHz stereo MP3 before being joined.

What this audio joiner does—and does not do

This is an end-to-end audio joiner: it places one file after another. It does not overlap tracks, mix background music under speech, trim individual files, add crossfades, insert silence, or normalize loudness. If source files have noticeably different volume levels, those differences remain audible in the merged result.

Long uncompressed WAV or FLAC recordings and mixed-format projects take more memory and processing time than matching MP3 files. For very large multi-hour projects, a desktop audio editor is more reliable than browser-based processing.