Merge multiple audio files into a single track. Add crossfades, silence gaps, and create seamless audio compilations.
Merge as many audio files as you need
Smooth transitions between tracks
Add pauses between clips
Mix different audio formats together
Upload or drag multiple audio files
Reorder clips, add crossfades or gaps
Get your merged audio file
Combine intro, segments, and outro into a single episode
Create mixtapes or combine song sections
Merge chapters into a complete book
An audio joiner is an online tool that lets you combine two or more audio files into a single, seamless track. Whether you need to merge a podcast intro with your main recording, join multiple song sections, or create a continuous mix, an audio merger handles it all — no software installation required.
Defyaudio's online audio joiner runs entirely in your browser, meaning your files never leave your device. This makes it one of the most private audio joiner tools available. Unlike traditional desktop software, there is nothing to download — just open the tool, add your clips, and combine them in seconds.
The audio joiner gives you full control over how clips are joined: set the playback order, add crossfades for smooth blending, or insert silence gaps between tracks. The result is a single polished file ready to share or publish.
Whether you call it an audio merger, an audio combiner, or an audio file joiner, Defyaudio does the same job: it takes several audio clips and stitches them into a single track. The terminology varies by region and use case — the tool stays the same.
Audio merger
An audio merger combines multiple files end-to-end. Defyaudio's audio merger online preserves quality, supports unlimited clips, and lets you choose the output format.
Audio combiner
Use the audio combiner to stick clips together with optional crossfades or silence gaps. Ideal for combining podcast intros, voiceovers and main recordings.
Audio file joiner
An audio file joiner is exactly what it sounds like — it joins audio files. Defyaudio's audio file joiner handles MP3, WAV, FLAC, OGG, M4A and AAC in any combination.
Audio joiner online (free)
Looking for an audio joiner online free? Defyaudio is free to use with a free account — no software download, no upload to any server, runs entirely in your browser.
Merging audio online with Defyaudio takes less than a minute. Follow these steps to combine audio clips into one file.
Open the Audio Joiner
Navigate to the Audio Joiner tool on the Defyaudio homepage.
Upload your files
Click "Add Files" or drag and drop your audio clips. You can add as many files as needed — there is no limit.
Arrange the order
Drag clips into the sequence you want. The merged audio online will follow this exact order.
Configure transitions
Choose a crossfade duration for smooth blending between audio clips, or add silence gaps to create natural pauses.
Select an output format
Pick your preferred format: MP3, WAV, OGG, and more.
Merge and download
Click "Merge" to combine audio clips in your browser. Once done, your file downloads instantly.
Defyaudio's audio joiner supports all major formats, so you can merge audio files regardless of their source. You can even combine audio files from different formats in the same session.
MP3
The most common format. Our MP3 joiner handles bitrates from 64 kbps to 320 kbps — ideal for podcasts and music.
WAV
Lossless audio for professional-quality merges with no compression artifacts.
OGG
Open-source format widely used in games and web applications.
FLAC
High-resolution lossless audio, perfect for audiophiles wanting to combine MP3 files with studio-quality clips.
AAC
Efficient compressed format used by Apple devices and streaming platforms.
M4A
Common on iOS and macOS. Combine audio files from any Apple device seamlessly.
Defyaudio's audio joiner supports crossfade transitions — a smooth fade-out at the end of one clip combined with a fade-in at the start of the next. This is the standard technique for professional audio merges.
Crossfade (fade in + fade out)
Set a crossfade duration between any two clips. As the first track fades out, the second simultaneously fades in — creating a seamless blend with no audible cut.
Silence gaps
Insert a silence gap of any length between clips for a clean, neutral pause — ideal for podcast segments or audiobook chapters.
Per-clip control
Apply different crossfade durations between different pairs of clips in the same session.
Works with any format
Fade in and fade out transitions work across MP3, WAV, FLAC, OGG, M4A and all other supported formats.
Joining and mixing are two different jobs. Joining puts clips one after another on a single timeline; mixing layers them so they play at the same time. Defyaudio does both — pick the one that matches what you want to hear.
Join — clips play one after another
Use the audio joiner on this page to merge clips end-to-end: podcast intro then episode, chapter after chapter, song sections in order. Add crossfades or silence gaps between them.
Mix — tracks play at the same time
Use the audio mixer to overlay tracks so they overlap: background music under a voiceover, a vocal over a beat, two songs layered together — each with its own volume.
There's no limit! You can merge as many audio files as you need. The tool handles everything from combining 2 files to merging dozens of clips.
Yes! You can add custom silence gaps between any clips. This is perfect for creating pauses between podcast segments or audiobook chapters.
A crossfade smoothly transitions from one audio clip to the next by gradually fading out the first while fading in the second. This creates professional, seamless transitions.
Absolutely! You can mix MP3, WAV, FLAC, and any other supported format. The output can be in your choice of format.
Joining places clips one after another, so they play in sequence — that's what this tool does. Mixing layers tracks so they play at the same time, like music under a voiceover. If you need tracks to overlap rather than follow each other, use the DefyAudio Audio Mixer instead.
Processing happens in your browser, so limits depend on your device's memory. Most modern devices can handle hours of audio without issues.