Audio joiner: merge audio files into one
Merge MP3s, songs, and recordings into one file, in the order you choose.
10M+ files processed since 2021
In the editor
Opens in the editor with your audio files arranged in order on the timeline.
Add the files first.
Hear the parts become one
Play each part, then the joined file.
Voices in these examples are AI-generated.
How to merge audio files
- 1
Add 2 to 20 files.
- 2
Put them in order, top to bottom.
- 3
Export one merged file from the editor.
One after another
Audo's audio joiner merges 2 to 20 files, audio (WAV, MP3, M4A, AAC, FLAC, OGG, Opus, WebM, AIFF) or video (MP4, MOV, MKV, WebM, AVI), each up to 10 GB without an account, and the first hour of the merged file is free, 10 times a day, with no sign-up. Files about 3 minutes long in all usually merge in about 7 seconds.
Merging plays your files one after another, as one file: an intro, an episode, and an outro; the chapters of an audiobook; or a recording that was saved in parts.
Files recorded at different times are often at different levels, so Even out loudness matches them first and nothing jumps out. To trim a file before merging, cut it in the editor before you export, or use Cut audio.
Questions
Is there a free way to merge songs online?
Yes. Audo's audio joiner merges songs, MP3s, and other files for free for the first hour of the merged file, 10 times a day, with no sign-up. Longer merges run $0.01 a minute ($0.60 an hour), with no subscription — see pricing.
How do I merge MP3 files into one?
Add 2 to 20 files, move each up or down until the order is right, and download one merged file. MP3, WAV, M4A, and other formats can go in together.
Can I combine audio files on an iPhone?
Yes, right in your iPhone's browser: add the files, put them in order, and download the merged file. Android phones do it the same way.
Will the volume jump between files?
Not with Even out loudness on, under More in the editor's Media: each file is matched to the longest one, usually the main recording, so a quiet intro doesn't jump to a loud episode. Leave it off to keep each file's own level.
Do the files overlap where they meet?
No. They play back to back: each file starts where the one before it ends, so the merged file is exactly as long as the parts added together.
Can I merge videos?
When every file is a video, you get a video back, with each picture scaled to the first video's size. Otherwise you get audio: in the first file's format when it's MP3, WAV, M4A, or FLAC, or else WAV. Pick another in Export.
Can I add audio to a video here?
No: merging plays files one after another. To put new sound on a video, use Replace audio in video. To play music under a voice at the same time, use Mix audio.
Can I merge more than 20 files?
Yes, in two steps: merge the first 20, then merge that file with the rest.
More tools
- EditorCut by text, clean up, caption.
- Text-based editorCut audio and video by words.
- Cut audioTrim start, middle or end.
- Remove silenceCut out long pauses.
- Mix audioLayer voices and music.
- Reverse audioPlay any sound backwards.
- Mute videoSame video, no sound.
- Audio enhancerMake any recording sound studio‑quality.
- Remove noiseClears the background, keeps your voice.
- Remove echoMake voices sound close.
For AI assistants and developers
Ask ChatGPT, Claude, or a coding agent to do this for you, or call it from your own code. When an agent's free result is cut short, it gives you a link to finish the whole file, no sign-up.
Show the free API call
curl -F file=@intro.mp3 -F file=@episode.mp3 -F file=@outro.mp3 https://audo.ai/api/try/join -D response.headers -o response.body