Audio Crossfade
Overlap the end of one decoded audio file with the beginning of another using an equal-power or linear fade curve, then export a new 16-bit PCM WAV.
How crossfade works
The end of the first file overlaps the start of the second file for the duration you choose. Equal-power uses cosine/sine gain curves to reduce the perceived dip often heard with a simple linear overlap. Linear crossfade uses straight amplitude ramps.
Compatibility requirement
Build 105 requires both decoded files to have the same sample rate and channel count. If they differ, use the Sample Rate Converter or Mono/Stereo Converter first. The tool does not silently change either source.
Choosing a duration
Short crossfades can smooth edit joins; longer crossfades are useful when transitioning between music beds or ambience. The crossfade cannot be longer than the shorter source. Listen to the exported result because phase, rhythm and content can affect how a transition sounds.
Quality, metadata and privacy
The files are decoded and processed locally in your browser. Output is 16-bit PCM WAV. Source tags, cover artwork and compressed-format metadata are not preserved, and processing lossy source audio cannot recover information already discarded by an earlier codec.
FAQ
Is equal-power the same as mastering? No. It is only a gain law for the overlap. Will this beat-match songs? No. Build 105 does not analyze BPM, warp tempo or align musical beats.
Related tools
Use Audio Merger for hard joins, Fade In & Fade Out for single-file fades, and the conversion tools below when input properties differ.