Merge multiple audio files into one MP3, mixed formats welcome, processed locally in your browser, never uploaded.
Your audio is processed locally with FFmpeg running in your browser. Nothing is uploaded; the files never leave your device. First use downloads the ~31 MB engine once. Each file up to 200 MB.
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Merging audio is the everyday job of combining separate recordings into one file: stitching podcast segments together, joining voice takes recorded in multiple passes, or building a single track out of ripped CD parts. This tool concatenates two to twenty files into one MP3 that plays back-to-back in the order you pick; the file list on the page shows exactly how the result will be assembled.
Mixed inputs are welcome. Every file is fully decoded and then re-encoded into one uniform MP3, so you can combine an M4A voice memo with a WAV intro and an OGG clip without worrying about sample rates, channel counts, or codecs; mismatched files are the classic failure mode of naive "join" tools, and re-encoding is what makes them work. The trade-off is one generation of MP3 encoding at quality 2 (~190 kbps), which is transparent for most listeners and most material. Tracks are joined directly with no crossfade or inserted silence.
Merging runs locally with FFmpeg compiled to WebAssembly, so your recordings never leave your device. Related jobs: pulling audio out of videos first with the Audio Extractor, trimming each clip beforehand with the Audio Cutter, or converting the merged file to another format with the Audio Converter.
Yes. Every input is fully decoded and then re-encoded into one uniform MP3, so formats, sample rates, and channel counts can differ freely: an M4A voice memo merges with a WAV intro and an OGG clip without a hitch. This is exactly why the tool always re-encodes instead of copying raw audio data together, which only works when every input matches perfectly.
The result passes through one MP3 encode at variable bitrate quality 2 (~190 kbps), which is transparent for most listeners and most material. Sources that are already compressed (MP3 or AAC files) see one extra generation of loss that is inaudible in practice; merging from WAV or FLAC keeps essentially all of the original fidelity.
Yes, files are concatenated in the exact order shown in the on-page list, top to bottom. To change the order, remove the files you want to move and add them back in the sequence you want. The first file in the list is the first thing you hear in the merged MP3.
No. This tool joins files directly: the end of one track is followed immediately by the start of the next, with no crossfade, gap, or silence padding. For transitions and spacing you need a digital audio workstation or a dedicated editor; for straightforward concatenation this is the fastest path.
A single uniform output keeps merging robust for mixed inputs: MP3 at quality 2 sounds good, plays everywhere, and encodes quickly in the browser. If you need the merged result as WAV, OGG, M4A, or FLAC, merge here first and then run the single output through the Audio Converter, which handles all of those formats.