Audio Joiner Online Free
A free browser-based audio joiner with per-clip volume, trim, fade in/out, crossfade curves, EQ, and loudness normalization. Merge MP3, WAV, FLAC, OGG and 5 more formats — no uploads, no limits.
Combine, trim, crossfade, and normalize multiple audio tracks into one
Add at least 2 audio files
Features
How to Merge Audio Files
- Upload Files. Drag and drop or browse to add 2 or more audio files. All common formats are supported.
- Arrange & Edit. Drag tracks to reorder. Expand each track to adjust volume, trim, fade in/out, and EQ. Set transitions between tracks.
- Preview. Click Play to hear the merged result in real-time before exporting. Seek to any position.
- Export & Download. Choose your output format and quality, click Join, and download the merged file.
Frequently Asked Questions
How many files can I merge at once?
Up to 50 files totaling 500 MB. Each file can be up to 200 MB. The practical limit depends on your device's memory, but most use cases (2–20 files) work without issues.
Can I merge files of different formats?
Yes. You can combine MP3 with WAV, FLAC with OGG, or any other combination. The tool automatically converts all tracks to a common format before merging.
What are crossfade curves?
Crossfade blends the end of one track into the start of the next. Linear fades at a constant rate. Equal Power maintains perceived loudness during the transition. Logarithmic creates a faster initial fade that slows down.
Does merging reduce audio quality?
Lossless formats (WAV, FLAC) preserve full quality. For lossy formats (MP3, OGG), you can choose bitrate up to 320 kbps. The tool resamples everything to 48 kHz stereo for consistent output.
Are my files uploaded to a server?
No. All processing happens in your browser using FFmpeg WebAssembly. Your files never leave your device. There is a server fallback for older browsers, but only for files under 50 MB.
