#51 · Browser Audio Tool

Audio Crossfade Tool

Blend two audio files with an adjustable overlap and equal-power or linear curves, entirely in your browser.

Load and blend two tracks

Choose two files and set the overlap

Drop an audio file here or click to choose a supported audio file

No audio selected

Second audio fileCrossfade lengthsecondsCurve

Choose an audio file to begin.

Audio is processed locally in your browser and is not uploaded.

How to use Audio Crossfade Tool

Choose an audio file.
Adjust the tool-specific controls, then select the main action button.
Review the measured result, listen to the preview, and download the new file if useful.

What this audio tool does

This tool aligns the end of the first file with the start of the second, applies the selected crossfade curve, and writes a fresh WAV file.

The two decoded tracks are resampled by OfflineAudioContext when needed, mixed sample by sample across the overlap, and encoded as 16-bit PCM WAV.

Very large files use substantial memory because both tracks must be decoded before mixing.

Supported formats and limits

Input decoding depends on Web Audio support in the current browser. Output is WAV unless this converter explicitly uses a browser-verified MediaRecorder codec.

Stage	Details
Input	Browser-decodable audio, up to 600 MB
Processing	Local Web Audio sample data
Output	New Blob with a matching MIME type

Example and practical tips

Try audio crossfade tool on a short copy first, listen for artifacts, and then process the full recording. Cleaner input produces easier-to-read results.

Close other audio-heavy tabs while processing.
Keep the source file until you have checked the download.
Reset before testing a different recording.

Frequently asked questions

How long should an audio crossfade be?

Audio Crossfade Tool uses the option shown above and real decoded audio data, so the best setting depends on the recording rather than a fixed preset.

Can I crossfade files with different sample rates?

Browser audio capabilities vary. The page checks the required decoder or encoder and shows a specific error when it is unavailable.

Does equal-power crossfade prevent a volume dip?

The calculation is based on samples from the selected or recorded audio, not on the filename or a simulated result.

Can I crossfade MP3 files without uploading them?

Processing stays in this browser tab. Object URLs and decoded buffers are released when you reset or leave the page.

Why is the download a WAV file?

Use a clean source, preview the result, and adjust the available controls if the first pass is not a good fit.

Related audio tools

Audio Trimmer Audio Merger Fade In Audio Fade Out Audio

Processing details

Privacy	Local browser processing
Core method	The two decoded tracks are resampled by OfflineAudioContext when needed, mixed sample by sample across the overlap, and encoded as 16-bit PCM WAV.
Priority	B

Browse more audio tools

Callaudio categories

Audio Editing & Trimming

Cut, split, join, fade, reverse, and arrange audio.

View all

Audio Conversion & Export

Convert and export common browser-compatible formats.

View all

Volume & Loudness

Adjust gain, normalize levels, and inspect loudness.

View all

Speed, Pitch & Timing

Change playback, pitch, tempo, delays, and timing.

View all

Recording & Voice

Record, test, monitor, and prepare voice audio.

View all

Podcast & Speech

Prepare spoken audio, podcast sections, and transcripts.

View all

Music Practice & Tone

Practice with tones, tempo, tuning, and rhythm aids.

View all

Audio Analysis & Metadata

Inspect waveform, frequency, duration, peaks, and tags.

View all