01Phase 01
Upload & Reorder Tracks
Drop multiple audio files in any format. Reorder clips effortlessly to arrange your sequence or podcast chapters.
Zero-Upload Audio Merger · Equal-Power Crossfades
Merge Multiple Audio Files with Seamless Crossfades
Join songs, voiceovers, podcast chapters, and sound bites into a single uncompressed WAV track. Tune equal-power crossfades and silence gaps with 100% private browser processing.
Audio Joiner & Multi-Track Merger
100% Browser Local·0 Tracks
20 ms
0.0 s
Drop multiple audio files here
Supports MP3, WAV, M4A, FLAC, OGG, and AAC. Files are decoded in parallel directly in your browser.
Audio Merging Guide · Crossfades
How AutoSilenceCut merges audio in browser memory
Three simple steps to combine multi-track audio files with studio-grade equal-power transition curves.
02Phase 02
Tune Crossfades & Gaps
Select equal-power cosine crossfading to eliminate volume dips, or insert silence spacing between spoken chapters.
03Phase 03
Audition & Export Master
Instantly audition the merged master track in your browser and export an uncompressed, broadcast-ready 16-bit PCM WAV file.
Connected finishing workflows
Explore companion utilities for dialogue cleanup, speech pacing, and mastering.
Audio Standards & Research
Engineering guides & deep-dive workflows
Explore the acoustic principles, cosine crossfade mathematics, and audio merging best practices.
Audio Joiner7 min read
How to Merge Multiple Audio Tracks Seamlessly with Equal-Power Crossfades
Why linear crossfades cause a -3dB volume dip and how equal-power cosine crossfades maintain perceived loudness when joining multi-track audio buffers.
Audio Cutting7 min read
How to Trim Audio Files Accurately at Zero-Crossings Without Clicks
The physics of zero-crossing splices and 8ms equal-power crossfades: how to cut dialogue tracks cleanly without abrupt voltage step artifacts.
WAV vs MP36 min read
WAV vs MP3 for Editing Voice: When to Choose Each Format
A technical deep-dive into codec generation loss: why you must keep your master timeline in PCM WAV and only compress to MP3 for final distribution.
Frequently asked questions
Technical details regarding browser audio joining and crossfade rendering.
How does the Audio Joiner merge multiple audio files?+
AutoSilenceCut decodes your uploaded audio clips directly in your browser using the Web Audio API. It concatenates the audio buffers sequentially with your chosen crossfade duration (0–500ms) or silence gap spacing (0–3s), rendering an uncompressed 16-bit PCM WAV master directly on your machine.
What is an Equal-Power Cosine crossfade?+
Unlike basic linear crossfades that cause an audible 3dB volume dip in the middle of transitions, equal-power cosine crossfades maintain constant acoustic energy across the blend, delivering a seamless, natural transition between songs or spoken takes.
Can I reorder audio clips before merging?+
Yes. Use the up and down movement controls on each track card in the queue to instantly reorder your tracks before previewing or exporting.
Are my audio files uploaded to any server?+
No. 100% of audio decoding, buffer slicing, crossfading, and WAV rendering executes locally inside your web browser. No audio bytes or metadata ever leave your computer.
What audio formats are supported?+
You can upload and merge MP3, WAV, M4A, FLAC, OGG, AAC, and WebM audio files with zero upload wait times. Files are decoded in browser memory, so total length is limited by your device RAM.
Workflow Mesh
Complementary Audio Editing Tools
Pair multi-track joining with boundary trimming, tempo stretching, and batch take slicing.