Audio Merger
FFmpeg PoweredMerge multiple audio files into one
Drag & drop files here, or click to select
Supports MP3, WAV, OGG, M4A, FLAC and other common formatsHow to Use
- Click the area above to select a file, or drag and drop a file onto the page
- Adjust parameters in the settings area
- Click the process button and download the result when ready
Frequently Asked Questions
How It Works
The Audio Merger uses FFmpeg WebAssembly with the concat demuxer or amix filter to combine multiple audio files into a single continuous output. The tool handles format normalization, sample rate alignment, and channel matching automatically.
The merge process: (1) All input files are decoded to PCM to a common sample rate (typically the highest among inputs). (2) If formats differ, resampling ensures all streams match the target sample rate and bit depth. (3) The concat filter joins the audio streams end-to-end. (4) The combined stream is re-encoded to your chosen output format.
When files have different formats, the tool automatically converts all inputs to the target format before concatenation. The amix filter is used for overlay mixing (simultaneous playback) rather than sequential concatenation. The tool supports unlimited input files, limited only by available browser memory.
Tips & Best Practices
- Match formats for best quality: Merging files that are already in the same format avoids unnecessary re-encoding.
- Normalize first: Use the Audio Normalizer on each file before merging to ensure consistent volume levels throughout.
- Add silence between tracks: For music compilations, insert 1-2 second silence gaps between songs using the Audio Trimmer first.
- Order matters: Files are merged in the order you add them — arrange them carefully before processing.
- Check file counts: Merging 50+ files requires significant memory. Process in batches if needed.
- Use MP3 output for the widest compatibility when merging diverse audio sources.
Use Cases
Podcast producers combining separately recorded intro, main content, and outro segments into a complete episode file.
Music curators merging individual songs into a continuous DJ set or playlist for streaming platforms. Audio book producers combining chapter recordings into a single complete audiobook file. Lecture archivists merging multiple class session recordings into a single course audio file. Conference organizers combining speaker presentations into a single continuous recording. Sound designers concatenating individual sound effects into a sequential sound library.