Combine multiple audio files into one track. Drag and drop to reorder, merge MP3s, WAVs, and other formats. Create seamless audio compilations online.
Combine multiple audio files into a single continuous track. Upload your files, arrange them in the order you want, and merge. The tool concatenates them sequentially with optional crossfade between segments. Useful for assembling podcast episodes from separately recorded sections, stitching voice memos together, or building compilation tracks.
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Generate beautiful waveform visualizations from audio files. Choose from bars, mirror, line, or circular styles. Customize colors and export as PNG.
Detect the tempo (BPM) of any audio file. Includes tap tempo feature and genre reference guide.
Trim, cut, and slice audio files with interactive waveform visualization. Drag handles to select portions, use keyboard shortcuts, zoom and pan, preview selection before export. Supports MP3, WAV, OGG, AAC.
An intro, the interview, and an outro are three separate files that must become one episode.
Input
intro.mp3 + interview.mp3 + outro.mp3 · 0.5 s crossfade
Output
episode.mp3, joined in order with smooth transitions
Files are concatenated in sequence with optional crossfades so the seams do not pop, and a common sample rate is enforced to prevent pitch/speed glitches between clips. One pass produces a ready-to-publish episode.
Combine multiple audio files into a single continuous track. Upload your files, arrange them in the order you want, and merge. The tool concatenates them sequentially with optional crossfade between segments. Useful for assembling podcast episodes from separately recorded sections, stitching voice memos together, or building compilation tracks.
Join an intro, main content, and outro recorded as separate files into one episode.
String favorite tracks or segments together into a single listening mix.
Merge several short memos from a meeting into one continuous recording for easier review.
Audio Merger decodes every uploaded file with the Web Audio API's decodeAudioData and works on the raw AudioBuffer in your browser, then offers two genuinely different merge modes. Sequential plays the tracks one after another in the order you arrange them, and Overlay mixes them all onto one timeline so it doubles as a basic multitrack mixer. Because all files are decoded into one AudioContext, the merged output is built at the highest sample rate found across your tracks (Math.max of every buffer's sampleRate) and the highest channel count, so a stereo 48 kHz file mixed with a mono 44.1 kHz file is reconciled to 48 kHz stereo rather than degrading to the lowest common denominator. It accepts mp3, wav, ogg, aac, m4a, flac, weba, mp4 and webm, and always exports a single MP3 encoded with lamejs 1.2.1 at 192 kbps, named merged-audio-sequential.mp3 or merged-audio-overlay.mp3 depending on the mode.
In Sequential mode you can set a Crossfade Duration from 0 to 5 seconds (0.1s steps), which converts to crossfadeSamples = floor(crossfadeDuration x sampleRate). For each track after the first, the overlapping region is blended linearly: as crossfadeProgress runs 0 to 1 across that window, the previous track is multiplied by (1 - progress) while the incoming track (scaled by its own volume) is multiplied by progress, and the total output length shrinks by one crossfade window per join. A crossfade of 0 produces a hard butt-join with no blending, which can click if neither edge sits at a zero-crossing, so a fraction of a second of crossfade is the simplest way to smooth seams between clips of different loudness. Overlay mode instead sizes the output to the longest track and sums every track sample-by-sample, but each track is scaled by volume / number-of-tracks before being added, an automatic attenuation that prevents the summed signal from clipping when you stack several full-level files.
Each track carries its own editable parameters surfaced by clicking it: a Volume slider from 0 to 200% (0-2.0, 0.05 steps) that is applied as a flat gain in both modes, plus Advanced controls for Trim Start/Trim End (0.01s steps, kept at least 0.1s apart) and Fade In/Fade Out from 0 to 5 seconds. The fades are quadratic, not linear: the gain is multiplied by t-squared across the fade-sample window (t = i / fadeSamples), giving a gentler, more natural-sounding taper at the boundaries than a straight-line fade. Tracks are reordered by drag-and-drop, the visual timeline colors each segment by index and dims it by its volume, and a per-track Play button previews the trimmed-and-volume-adjusted clip through the live AudioContext (resuming a suspended context for iOS Safari) before you commit to the merge. All processing and encoding run client-side, so files never leave the browser.
No. The tool decodes each file internally and re-encodes the merged output in your chosen format.
There is no hard cap, but very large batches will take longer to process.
Yes, set the crossfade to zero and the clips will join with a clean cut, or add a gap of configurable duration.
Audio is decoded and processed locally with the Web Audio API. Your files are never uploaded to a server.