ALL AUDIO TOOLS18
Merge Audio
Merge Audio Files Online — Free Audio Joiner
Upload multiple audio files, arrange the order, and download a single merged file.
Nothing is enforced, but every file you add is decoded to 32-bit float at the same time — not one after another — then resampled, then copied again into one merged buffer, so the peak is several times the decoded size of the whole queue at roughly 20 MB per minute of 44.1 kHz stereo.
About Merge Audio
Need to combine multiple audio files into one? Whether you are assembling podcast segments, joining music tracks into a continuous mix, combining voice recording takes, or building an audio compilation, this tool merges multiple audio files seamlessly. Upload your files in any combination of formats — MP3, WAV, OGG, M4A, and FLAC are all supported, and you can mix different formats in the same merge. Use the up and down arrows on each row to put them in the exact sequence you want, then download a single merged file as MP3 (compact, ideal for sharing) or WAV (lossless, ideal for further editing). The tool decodes each file using the Web Audio API, automatically resamples them to a consistent sample rate if the source files differ, concatenates the AudioBuffers in order, and re-encodes the result as a clean, continuous audio file. The transitions between files are seamless with no gaps or clicks.
Questions
Can I merge different audio formats?
Yes! You can mix MP3, WAV, OGG, M4A, FLAC, and other formats. Each file is decoded to raw audio before merging, so the input format doesn't matter.
What if my files have different sample rates?
The tool automatically resamples all files to match the highest sample rate among your inputs, ensuring consistent quality throughout the merged output.
Can I reorder the files before merging?
Yes. After uploading, you can drag and drop the files to arrange them in the order you want before merging.
Is there a limit on how many files I can merge?
No count is enforced, but every file you add is decoded to 32-bit float at the same time — not one after another — then resampled, then copied again into a single merged buffer, so the peak is several times the decoded size of the whole queue, and decoded audio runs about 20 MB per minute of 44.1 kHz stereo. This is the heaviest job on the site: a few podcast-length files are comfortable, a dozen hour-long ones are not.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.