How to Join Audio Files Into One Track for Free

To join audio files, drop two or more clips into a browser-based Audio Joiner, confirm the numbered list shows them in the right order, choose an output format and bitrate, then click Merge. The clips are placed back to back and re-encoded into one file, so MP3, WAV and M4A sources can share a track.

People join audio for very ordinary reasons: stitching a podcast intro onto an episode, turning five voice memos from a client call into one file, building a background loop for a product video, or combining an audiobook that arrived as forty short chapters. The mechanics are simple, but order, format and bitrate decide whether the result sounds clean or slightly off.

Free toolAudio JoinerMerge multiple audio files into a single track with custom ordering and smooth crossfades. Processing runs entirely in your browser without file uploads.Open the tool

How to join audio files step by step

The steps below use the Audio Joiner, which runs in your browser and never uploads your recordings.

1. Rename your clips with a number prefix (01-intro, 02-interview, 03-outro) so the order is obvious before you start.
2. Open the Audio Joiner and drop at least two files onto the box labeled “Drop your audio files here”. It accepts MP3, WAV, M4A, AAC, OGG, FLAC and Opus.
3. Use Add files if you forgot a clip; new files are appended to the end of the list.
4. Read the numbered list carefully. Clips are merged exactly in that order, from 1 downward.
5. If the order is wrong, click Clear and add the files again in the right sequence.
6. Pick a Bitrate chip: 96, 128, 192 (recommended), 256 or 320 kbps.
7. Choose the Output format: MP3, WAV, FLAC, M4A (AAC), AAC, OGG (Vorbis) or Opus.
8. Click Merge. On first use the browser downloads the processing engine once (about 30 MB); after that, jobs start immediately.
9. Play the preview under the result, then click Download to save the merged file.

Free toolAudio JoinerMerge multiple audio files into a single track with custom ordering and smooth crossfades. Processing runs entirely in your browser without file uploads.Open the tool

Which output format should the merged track use?

The joiner always re-encodes, which is what lets you mix formats. It also means the output format is a real decision rather than an afterthought. Bitrate only matters for the lossy formats; WAV and FLAC ignore the bitrate chip because they store the full signal.

Output format	Type	Bitrate chip applies	Rough size per minute	Best for
MP3	Lossy	Yes	about 0.7-2.4 MB (96-320 kbps)	Sharing, podcasts, any player
M4A (AAC)	Lossy	Yes	about 0.7-2.4 MB (96-320 kbps)	Apple devices, video editors
OGG (Vorbis)	Lossy	Yes	about 0.7-2.4 MB	Web apps and games
Opus	Lossy	Yes	about 0.7-2.4 MB	Speech at low bitrates
FLAC	Lossless	No	usually around half of WAV, varies with content	Archiving the joined master
WAV	Uncompressed	No	about 10 MB (44.1 kHz, 16-bit stereo)	Further editing in a DAW

The lossy sizes are simple arithmetic: bitrate multiplied by duration. A 192 kbps file uses 192,000 bits per second, which works out to roughly 1.44 MB per minute.

A practical rule: if every source clip is already MP3, export MP3 at 192 kbps or higher so the extra encoding pass stays inaudible. If the joined file is going back into an editor for music, fades or leveling, export WAV or FLAC and compress only at the very end. When you later need a different format, the Audio Converter for MP3, WAV, FLAC, M4A and OGG handles that as a separate step.

Preparing clips so the joins sound clean

The joiner places clips end to end with no gap and no crossfade. That is exactly what you want for chapters recorded in one session, but it exposes anything rough at the edges of each file.

Trim silence and clicks first

If a voice memo starts with half a second of rustling or ends with a phone-lock click, that noise now sits in the middle of your track. Trim the edges before joining. A very short fade at the start and end of each clip also hides abrupt cuts.

Match loudness between sources

Clips recorded on different devices rarely have the same volume. A quiet phone recording next to a studio intro makes listeners reach for the volume button. Level the quiet clips before merging rather than trying to fix the combined file.

Bring odd sources into a common format

Mixed sample rates and channel counts are handled automatically when the clips are combined, so a 48 kHz video soundtrack can sit next to a 44.1 kHz music file. What the joiner cannot do is pull audio out of a video. If one piece of your track lives inside a screen recording, first extract the MP3 audio track from the MP4 video, then add that MP3 to the list. For a large batch of raw recorder files, you can also convert uncompressed WAV files to MP3 first so the joining step runs on smaller inputs.

For a wider overview of formats, codecs and bitrates, read the complete guide on how to convert audio files in your browser.

Common mistakes

• Trusting the drop order without checking: when several files are dropped at once, the list order may not match what you had in mind, and chapter 10 ends up before chapter 2. Number your file names with leading zeros (01, 02, 10) and read the numbered list before clicking Merge.
• Exporting MP3 sources at a lower bitrate: joining 320 kbps music into a 96 kbps file adds audible artifacts to every clip. Export at the same or a higher bitrate than your best source, or use WAV for an intermediate master.
• Leaving noise at clip edges: breaths, clicks and room hum at the start or end of a clip become obvious mid-track. Trim and fade each clip before you add it.
• Joining clips with very different loudness: the combined file jumps between quiet and loud sections. Level each clip first so the transitions feel continuous.
• Expecting gaps or crossfades: the joiner butts clips directly together, so music that needs a transition sounds abrupt. Add a fade-out and fade-in to the edges of the clips before joining, or record a short silence clip and place it between them.
• Loading an entire day of WAV recordings at once: the browser can run out of memory on very large jobs. Join in smaller groups, or compress the sources first, then merge the groups.

Frequently asked questions

Can I join MP3, WAV and M4A files together? Yes, you can join different audio formats into one track. The joiner decodes every clip and re-encodes the result into the single output format you choose, so the source formats do not have to match.

Does joining MP3 files reduce audio quality? Joining MP3 files causes a small quality loss because the combined track is encoded again. Keep it inaudible by exporting at the same or a higher bitrate than your best source, or export to WAV or FLAC if the file will be edited further.

How do I change the order of the clips? Clear the list and add the files again in the order you want them to play. The joiner merges clips in the numbered order shown on screen and has no drag-to-reorder, so numbering your file names beforehand saves time.

Is there a size limit for joining audio files? Yes, the combined size of all clips can be up to 1 GB. In practice the limit is your device’s memory, so very long high-resolution WAV sessions may need to be joined in smaller groups.

Wrapping up

Joining audio well comes down to three decisions: the order of the clips, the output format, and a bitrate that does not throw away quality your sources already had. Clean up clip edges first, check the numbered list, and export once. When your files are ready, open the free Audio Joiner and merge them into a single track without uploading anything.