Audio Joiner

Merge multiple audio files into one. Drag and drop to reorder, then join them together.

Read tutorial β†’

Drag & drop audio files here or click to browse

Supports MP3, WAV, OGG, AAC, M4A β€” Add multiple files

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Why AudioNeo?

Lightning Fast

Powered by FFmpeg WebAssembly β€” the same engine used by desktop apps, running right in your browser.

100% Private

Your files never leave your device. All processing happens locally β€” zero server uploads, zero data collection.

Works Everywhere

Works on any modern browser β€” Chrome, Firefox, Safari, Edge. Desktop or mobile, no installation needed.

No Upload No Registration No File Limits Forever Free

πŸ”’ Your files never leave your device. All processing happens locally in your browser.

How to Join Audio Files Online

How to merge audio files step by step
  1. Add your audio files β€” Drag and drop multiple MP3, WAV, OGG, AAC, or M4A files, or click browse to select them. You can add as many as you need.
  2. Reorder the tracks β€” Drag files up or down to change the order they'll play in the final merged output.
  3. Choose crossfade (optional) β€” Select a crossfade duration (0 to 5 seconds) for smooth transitions between tracks, or leave it off for a clean cut.
  4. Join and download β€” Click "Join Audio Files" and download your merged track instantly when processing finishes.

Tip: Crossfade is great for making DJ-style mixes or seamless podcast compilations. For audiobooks or simple concatenation, set crossfade to None.

Why use AudioNeo's audio joiner?
Multiple File Merge Combine as many audio files as you want into a single track β€” no limit on the number of files you can join.
Drag & Drop Reordering Simply drag files up and down to set the play order. Intuitive and fast β€” no confusing list menus.
Crossfade Transitions Add smooth crossfade transitions between tracks β€” from 0 to 5 seconds. Perfect for mixes and compilations.
5 Format Support Join MP3, WAV, OGG, AAC, and M4A files. All files are normalized to the output format you choose.
100% Private Your files never leave your device. Every merge runs locally in your browser using FFmpeg WebAssembly.
Instant Results As soon as processing finishes, download your merged file with one click. No signup, no email, no queues.
What is audio joining used for?
  • Audiobook chapters β€” Combine multiple chapter files into one continuous audiobook for easier listening on long drives.
  • Podcast compilations β€” Merge podcast episodes or segments into a single file for a compilation episode or marathon listening.
  • Music playlists & mixes β€” Create a single continuous mix or playlist file from multiple songs β€” great for parties or workouts.
  • Voiceover production β€” Combine multiple voice recording takes into one polished voiceover track for videos or presentations.
  • Lecture & meeting recordings β€” Merge segmented recordings from a long lecture or meeting into one complete audio file.
  • Meditation & sleep tracks β€” Combine ambient sounds, music, and guided meditation segments into a single long-form audio experience.
How does online audio joining work?

Audio joining (or merging) takes multiple audio files and combines them end-to-end into a single continuous audio file β€” like taping several songs together on a cassette, but digitally with perfect quality.

AudioNeo uses FFmpeg WebAssembly β€” the industry-standard audio engine, compiled to run directly in your browser. Here's what happens:

  • Local file loading β€” All your audio files are loaded and decoded entirely on your device. Nothing is uploaded to any server.
  • Format normalization β€” If your files are in different formats or have different sample rates, FFmpeg normalizes them so they can be seamlessly joined.
  • Crossfade processing β€” If you choose a crossfade, the end of each track fades out while the beginning of the next fades in, creating a smooth transition.
  • Merging & output β€” The files are concatenated in the order you specified and encoded into a single output file, ready for instant download.

Because everything runs locally in your browser, there's no upload wait, no file size limit from us, and your audio files stay completely private on your device.

Frequently Asked Questions

How many audio files can I merge?

You can merge as many audio files as you need β€” there's no hard limit on the number of files. Just keep in mind that very large projects may take longer to process on slower devices.

What audio formats are supported?

AudioNeo supports joining MP3, WAV, OGG, AAC, and M4A files. If your files are in different formats, they'll automatically be normalized to a consistent output format.

Will my audio files be uploaded to a server?

No. All merging happens directly in your browser using FFmpeg WebAssembly. Your audio files never leave your device and are never sent to any server. Your privacy is guaranteed.

Can I rearrange the order of files?

Yes! You can drag and drop files to reorder them any way you like before merging. The top file plays first, and the bottom file plays last.

What is crossfade and when should I use it?

Crossfade is a smooth transition where one track fades out while the next fades in. It's great for music mixes and ambient compilations. Choose "None" for a clean cut between tracks β€” perfect for audiobooks and podcasts.

Does joining audio reduce quality?

If you're joining lossy formats like MP3, the output is re-encoded which involves minor quality loss. For best results, use WAV files or choose a high bitrate output. The crossfade feature also requires re-encoding.

Can I join audio on my phone?

Yes! AudioNeo works on any modern mobile browser including Chrome, Safari, Firefox, and Edge on both iOS and Android. The file list is fully touch-friendly.

Is audio joiner really free?

Yes. AudioNeo's audio joiner is completely free with no watermarks, no hidden fees, and no daily limits. You can merge as many files as you need.

Related Audio Tools

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Audio Converter

Convert between MP3, WAV, OGG, AAC, and M4A formats.

Audio Compressor

Reduce file size with custom bitrate and quality settings.

Volume Booster

Increase or decrease audio volume and normalize loudness.

Why AudioNeo?

Lightning Fast

Powered by FFmpeg WebAssembly β€” the same engine used by desktop apps, running right in your browser.

100% Private

Your files never leave your device. All processing happens locally β€” zero server uploads, zero data collection.

Works Everywhere

Works on any modern browser β€” Chrome, Firefox, Safari, Edge. Desktop or mobile, no installation needed.

No Upload No Registration No File Limits Forever Free

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