How to Merge Audio Files — Join MP3 Tracks Into One
Merging audio files combines multiple recordings into one continuous track. This is useful for joining podcast segments recorded separately, assembling interview questions and answers from different takes, or combining a music intro and outro with a main recording. This guide covers how to do it cleanly and what to expect from the output.
Concatenation vs Mixing — Know the Difference
Audio combining works in two fundamentally different ways. Concatenation (what this tool does) places files end-to-end: file 1 plays completely, then file 2 starts, then file 3. The output is a single continuous file lasting the sum of all input durations. This is what you want for joining podcast segments, assembling chapter recordings, or building a playlist.
Mixing layers multiple audio tracks on top of each other so they play simultaneously — this is what a DAW (digital audio workstation) does when you add background music under a voiceover. For mixing, use Audacity (free), GarageBand (Mac), or Adobe Audition. For sequential joining, use this tool.
- Ensure all files are at the same sample rate (44.1 kHz or 48 kHz) before merging for a seamless join
- Normalise the volume of each segment in an audio editor before merging to avoid sudden loudness jumps
- Trim silence from the end of each segment before merging for clean transitions between clips
Common Use Cases
Podcast production: record intro, main content, and outro as separate files, then merge them for the final episode before uploading to Apple Podcasts or Spotify. Audiobook chapters: combine multiple chapter recordings into a single section file. Playlists: join music tracks into one continuous file for uninterrupted listening.
Go to the Merge Audio tool and upload 2–5 audio files (MP3, WAV, FLAC, AAC, or OGG, up to 500 MB combined). Files are joined in the order you upload them. The output is MP3 at 192 kbps — high quality and universally compatible for podcast and general distribution.