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Merge audio files – audio joiner
FreeNo uploadNo signupWorks offline
This free audio joiner combines several songs, recordings or voice notes into one file. Put them in the order you want, add a smooth crossfade if you like, and download a single MP3 or WAV. It works on iPhone, Android, Windows and Mac, and your files never leave your device.
How to use Merge Audio (Audio Joiner)
- Choose or drop two or more files.
- Put them in order with the arrows.
- Choose a crossfade (optional) and the output format.
- Click Merge and download.
Supported formats
- Input: MP3, WAV, M4A, FLAC, OGG, Opus, MP4, MOV, WebM
- Output: MP3, WAV
How to join audio files on iPhone
Open this page in Safari or Chrome on your iPhone or iPad – there is no app to install.
- Tap “Choose files” and pick your recordings from the Files app. For Voice Memos, first open the memo’s ⋯ menu and choose Share → Save to Files.
- Use the arrows to put the clips in order.
- Tap Merge, then Download. The joined MP3 is saved to Files → Downloads, where you can share it to WhatsApp, Mail or any app.
How to join audio files on Android
Open this page in Chrome or any other browser on your phone.
- Tap “Choose files” and select the songs or recordings – hold a file to select several at once.
- Order them, choose a crossfade if you want one, and tap Merge.
- The MP3 is saved to your Downloads folder. Recorder apps and WhatsApp voice notes (Opus) can be joined too.
How to merge MP3 files on Windows and Mac
Drag the files from File Explorer or Finder onto the page, or click “Choose files”.
- Drop all the files at once; add more at any time.
- Reorder with the arrows and pick MP3 (smaller) or WAV (lossless) output.
- Click Merge and download – no installer, no account. Once loaded, the page also works offline if you install it as an app.
What people join audio files for
The same steps work for most jobs:
- Audiobook chapters – join the parts of a chapter into one track (up to 60 minutes in total).
- Podcasts – put an intro, the episode and an outro together, with a 1–2 second crossfade so the music blends.
- Mixes and playlists – chain songs into one file with a 3–5 second crossfade, for workouts, parties or a car without shuffle.
- Voice notes and interviews – combine recordings made in several parts into one file to send or transcribe.
Crossfade or back to back?
“None – back to back” plays each file straight after the previous one with no gap added, which suits audiobook parts and speech. A crossfade (1, 2, 3 or 5 seconds) fades the end of one file into the start of the next at an even loudness, which suits music. Some MP3s contain a few milliseconds of silence at the start or end from the program that created them; that silence is kept.
Mixing formats
You can mix formats, sample rates and mono and stereo files – for example an M4A voice memo with an MP3 song and the soundtrack of an MP4 video. Everything is converted to the same format before joining, so the result plays everywhere.
This audio joiner compared
How joining files here compares with the two usual alternatives:
| FilesProcess | Upload-based online joiners | Desktop editors (e.g. Audacity) | |
|---|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes | No |
| Install or sign-up | Neither | Often a sign-up for larger files | Install required |
| Works on phones | Yes | Usually | No |
| Crossfade | Yes, 1–5 s | Varies | Yes, set by hand |
| Watermark or daily limit | None | Common on free plans | None |
| Precise multitrack editing | No – joins files end to end | Rarely | Yes |
| Length limit | 60 minutes in total | Depends on the plan | Your computer’s memory |
Limitations
- Up to 60 minutes of audio in total and 500 MB per file.
- Which input formats open depends on your browser.
Privacy
Files you choose are read into your browser’s memory and processed on your device; they are not uploaded to a server. Temporary download links are released after use, and the offline cache never stores your documents. More about privacy and limits.
Frequently asked questions
What is the best free audio joiner?
For joining files end to end, a browser tool is quickest: nothing to install, and this one adds no watermark and does not upload your files. If you need to edit inside the tracks – cut words, layer music under speech – use a desktop editor such as Audacity.
How many files can I join?
As many as you like, as long as they add up to 60 minutes or less. Each file can be up to 500 MB.
Can I join MP3 files on my iPhone?
Yes. Open this page in Safari, choose the files from the Files app and tap Merge. The joined MP3 is saved to Files → Downloads.
Can I merge WhatsApp voice notes?
Yes. Save the voice notes to your phone (they are Opus or M4A files), choose them here and merge. Chrome and Edge open Opus files; Safari support depends on the iOS version.
Will there be a gap between the songs?
No gap is added. Choose “None – back to back” for a seamless join, or a crossfade to blend one track into the next.
Can I cut the files before joining them?
Yes – trim each file with the MP3 cutter first (link below under related tools), then join the trimmed files here.
Can I join audio from video files?
Yes. Add MP4, MOV or WebM videos and their soundtracks are joined; the picture is not kept.
Can I merge MP3 files without re-encoding?
The joined file is encoded once at the quality you choose, which keeps the levels consistent and lets crossfades work. At 192 kbps or above the difference is inaudible; choose WAV for no further loss.
Are my files uploaded?
No. The audio is decoded and processed in your browser, so recordings and videos never leave your device.
Is it free?
Yes – free with no signup, no watermark and no daily limit.
Related tools
- Trim Audio (MP3 Cutter)Cut a part of a song or recording – MP3 cutter and ringtone maker.
- Compress Audio (MP3)Make MP3 and other audio files smaller, or fit a size limit.
- Audio ConverterConvert any audio or video to MP3, WAV or OGG.
- Volume BoosterMake quiet audio louder without distortion, or normalize it.