Audio Joiner
Merge multiple audio files into one. Visual timeline with drag-to-reorder, crossfade controls, and gap adjustment.
Drop audio files here or click to upload
Supports MP3, WAV, OGG, M4A — add multiple files
What is an Audio Joiner?
An audio joiner (also called audio merger or audio combiner) is a tool that combines multiple audio files into a single continuous track. Whether you're creating a podcast from multiple segments, assembling a mixtape, combining voice recordings, or stitching together sound effects for a video project, an audio joiner makes the process simple and visual. ToolMagic's online audio joiner processes everything in your browser using the Web Audio API — no files are uploaded to any server. It displays each audio file as a waveform block in a horizontal timeline, lets you drag to reorder tracks, add crossfade transitions between clips, adjust gaps, preview the full merged result, and export as a high-quality WAV file. It supports MP3, WAV, OGG, and M4A input formats, handles files with different sample rates by resampling automatically, and provides a polished visual experience that rivals desktop audio editors — completely free with no signup required.
How to Merge Audio Files Online
- Upload audio files: Drag and drop multiple audio files or click to browse. Add as many tracks as you need.
- Arrange the order: Drag tracks up or down to reorder them in the desired sequence.
- Set crossfade: Adjust the crossfade duration (0-5 seconds) for smooth transitions between tracks.
- Preview: Click "Play All" to hear the merged result before exporting.
- Export: Click "Export WAV" to download the merged audio as a single WAV file.
Features
- Visual timeline: Each track displayed as a waveform block for easy visual arrangement.
- Drag to reorder: Simply drag tracks to change the playback order.
- Crossfade transitions: Smooth fade between tracks with adjustable duration from 0 to 5 seconds.
- Gap control: Add silence gaps between tracks for natural pauses.
- Multiple format support: Load MP3, WAV, OGG, and M4A files — even mix different formats.
- Auto sample rate matching: Files with different sample rates are handled automatically.
- Total duration display: See the total length of the merged output at a glance.
- 100% client-side: No uploads. Complete privacy.
Use Cases
- Podcast production: Combine intro, interview segments, and outro into a single episode file.
- Music playlists: Create seamless mixtapes or compilation tracks with crossfade transitions.
- Audiobook chapters: Merge individual chapter recordings into complete audiobook files.
- Sound design: Stitch together sound effects, ambient tracks, and dialogue for video projects.
- Meeting recordings: Combine multiple recording segments from a meeting into one continuous file.
- Language learning: Join vocabulary audio clips into practice playlists with gaps for repetition.
Tips & Tricks
- Use crossfade (0.5-2s) between music tracks for DJ-style smooth transitions.
- For speech or podcasts, use 0 crossfade and add a small gap (0.5-1s) for natural pauses.
- Trim individual clips with the Audio Trimmer before joining for a cleaner result.
- Adjust individual track volumes with the Audio Volume Changer before merging.
- Preview the full merged audio before exporting to catch any issues with transitions.
Frequently Asked Questions
How many files can I merge?
There's no hard limit on the number of files. However, very large combined durations (over 30 minutes total) may be slower to process depending on your device's memory.
Can I merge files in different formats?
Yes! You can mix MP3, WAV, OGG, and M4A files in the same merge. The tool decodes each format using your browser's built-in audio decoder and combines them seamlessly.
What is crossfade?
Crossfade creates a smooth transition between two tracks by gradually fading out the first track while fading in the second. This eliminates harsh cuts and creates a professional sound.
What if my files have different sample rates?
The tool handles this automatically. All files are decoded to a common format by the Web Audio API, so differences in sample rate, bit depth, or channel count are resolved transparently.
Are my files uploaded to a server?
No. All processing happens entirely in your browser. Your audio files never leave your device, ensuring complete privacy.
What format is the output?
The merged audio is exported as a WAV file (uncompressed PCM) for maximum quality. Convert to MP3 separately if you need a smaller file.
Can I reorder tracks after adding them?
Yes! Simply drag and drop tracks to rearrange them in any order. The timeline updates in real time.
Can I add silence between tracks?
Yes, use the gap control to add silence (in seconds) between each track. This is great for creating natural pauses in speech recordings or audiobooks.
Related Tools
Trim individual clips first with the Audio Trimmer, or adjust volume levels with the Audio Volume Changer before merging.