Loading…
Drop audio files here to join
or click to browse — merge MP3, WAV, AAC, M4A, FLAC, OGG, OPUS, WMA, AIFF, AMR, CAF
Select audio filesMerge audio files into one seamless track — right in your browser. This free Audio Joiner combines MP3, WAV, AAC, M4A, FLAC, OGG, OPUS and more with a waveform editor, crossfades, loudness normalization and export presets. Nothing is uploaded, there’s no watermark, and matching tracks are joined losslessly.
Merge MP3, WAV, AAC, M4A, FLAC, OGG, OPUS, WMA, AIFF, AMR and CAF files into one track.
Auto-detects format, bitrate, sample-rate and channel differences and conforms them for you.
Identical MP3s are stream-copied with zero re-encode — instant, with no quality loss.
See every track’s waveform, trim with handles, and arrange clips on a visual timeline.
Add fade-in, fade-out and smooth crossfade transitions between tracks with custom duration.
Choose output format, bitrate up to 320 kbps, sample rate up to 96 kHz, and mono/stereo.
Normalize loudness, adjust gain, reverse, remove silence, and layer background music.
No upload, no account, no watermark. Everything runs in your browser, forever free.
Drag and drop your tracks, or click to browse. Add as many as you like — multiple and bulk upload are supported.
Drag tracks to reorder, or use Move Up / Move Down. The numbered timeline previews the exact join sequence.
Trim each track on its waveform, set fades, normalize volume, or add crossfades between tracks.
Pick a join mode, output format (MP3, WAV, M4A, FLAC, OGG, OPUS, AAC), bitrate and sample rate — or use a preset.
Click Join Audio. When processing finishes, preview the result and download your merged file — no watermark.
An audio joiner is a tool that combines two or more audio files into a single continuous track. Instead of juggling separate clips, you stitch them together so they play seamlessly — ideal for podcasts, mixtapes, audiobooks, voice memos, song mashups and lecture recordings.
This Audio Joiner lets you merge audio files online for free, directly in your browser. There is nothing to install and nothing to upload: your tracks are decoded and joined on your own device using WebAssembly FFmpeg, the same engine professional audio software relies on. That means real merging — not a preview — with a waveform editor, crossfades, and full control over format and quality.
Because it runs locally, it doubles as a private online audio merger: a fast, secure way to combine multiple audio files without sending your recordings to anyone’s server.
Joining audio with this tool takes under a minute. Add your files, set the order, choose how you want them combined, and download the result. The compatibility engine handles the hard parts — matching different sample rates, channels and codecs — so the final track plays cleanly everywhere.
When your tracks already share the same codec, sample rate and channels — for example, several MP3s exported from the same source — the joiner uses a lossless stream-copy. The original audio data is concatenated without being re-encoded, so the result is byte-for-byte identical quality and finishes almost instantly.
When tracks differ, a re-encode is needed to bring them into one format — but you stay in control. Choose the High Quality mode at 320 kbps, or export to a lossless container like WAV or FLAC, to keep your audio pristine.
You can join MP3, WAV, AAC, M4A, FLAC, OGG, OPUS, WMA, AIFF, AMR and CAF files — and mix formats freely in the same project. The tool reads each file’s real codec, sample rate and channel layout, then conforms everything into one clean output.
Export to MP3, WAV, AAC, M4A, FLAC, OGG or OPUS. MP3 is the most universal; WAV and FLAC are lossless; OPUS is the most efficient for voice and the web; M4A/AAC suit Apple devices.
For podcasters, the Audio Joiner stitches an intro, interview segments and an outro into one episode, with crossfades for smooth transitions and a 128 kbps MP3 podcast preset. Loudness normalization keeps every segment at a consistent, broadcast-friendly level.
For musicians and producers, join stems or song sections, export to lossless WAV or FLAC at 48 kHz, and layer background music with the built-in mixer. Voice-over artists and audiobook narrators can merge chapters, trim breaths, remove silence and export compact spoken-word files.
Normalize loudness when combining tracks from different sources so no segment is jarringly loud or quiet. Use short crossfades (0.5–1.5s) between music tracks for a seamless flow, and trim silent gaps at the start and end of each clip.
Match sample rates before joining for the cleanest result — the tool will conform them automatically, but starting from the same rate avoids resampling. For voice, mono at 96–128 kbps is plenty; for music, keep stereo at 192 kbps or higher, or go lossless.
Your audio never leaves your computer. All decoding, editing and joining happens inside your browser tab with WebAssembly FFmpeg, so there is no upload, no cloud copy and no third party handling your recordings.
Only small pieces of project metadata — track names, order and your chosen settings — can be saved locally so you can pick up where you left off. The audio itself is held in memory and released as soon as the join completes.
| Lossless copy | Re-encode | |
|---|---|---|
| Speed | Near-instant (no encoding) | Depends on length & quality |
| Quality | Identical to source (no loss) | Controlled by bitrate / format |
| Requirements | Tracks must share codec, rate & channels | Works with any mix of tracks |
| Transitions / edits | Not available | Crossfade, trim, fade, normalize, etc. |
| Format change | Keeps original (MP3) | Any format, bitrate or sample rate |
Join intro, segments and outro into one episode with crossfades and consistent loudness.
Merge song sections, stems or a mixtape and export to lossless WAV or FLAC.
Combine chapters, trim breaths and remove silence for a compact spoken-word file.
Stitch lecture recordings or language clips into a single track to study or share.
Blend tracks with smooth crossfades to build seamless mixes and loops.
Join voice-over and background music into a ready-to-post audio ad.
Your audio is decoded and joined locally with WebAssembly FFmpeg — it never touches a server.
Nothing is saved in the cloud. Only lightweight project metadata (names, order, settings) stays in your browser.
In-memory buffers are released the moment a join finishes or you close the tab.
Served over HTTPS with strict, cross-origin-isolated headers for fast, safe processing.
Joining tracks end-to-end so they play one after another as a single file.
Combining tracks without re-encoding, keeping the exact original quality. Works when tracks match.
Overlapping the end of one track with the start of the next so they blend smoothly.
Adjusting loudness so every track sits at a consistent, comfortable level.
How much data per second a lossy file uses. Higher = better quality and bigger files.
How many audio samples per second (e.g. 44.1 kHz = CD quality, 48 kHz = studio).
Mono is a single channel; stereo is two (left/right) for a wider sound.
The compression format of the audio — MP3, AAC, FLAC, Opus, Vorbis, PCM (WAV).
Trim and cut a single audio file precisely.
Convert audio between WAV, MP3 and more.
Reduce audio bitrate and file size.
Convert any audio or video to MP3.
Combine multiple videos into one file.
Cut and trim video clips online.
Reduce the size of any file fast.