Audio Tools

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Changing a recording

Audio pitch and speed loads a file and lets you adjust tempo and pitch separately — slow a passage to learn it, or transpose a backing track to a singer's key — and export the result. Stereo to mono mixes both channels to one, which halves file size for voice recordings and fixes the phase problems that occur when a stereo file is played through a single speaker. WAV to MP3 encodes uncompressed audio at a chosen bitrate for sharing or upload, using an encoder that runs in the browser.

Measuring and keeping time

The decibel meter uses the microphone to show the current and peak sound level, with the caveat the page states plainly: a laptop microphone is not a calibrated instrument, so treat it as a relative reading. The metronome plays a click at any tempo with accent patterns and subdivisions, timed by the audio clock rather than a JavaScript timer, so it does not drift.

Generating sound

The tone generator produces sine, square, triangle and sawtooth waves at any frequency and volume, for testing speakers, tuning, or finding the resonant frequency of a room. Morse sound plays text as Morse at a chosen speed and pitch, and is the companion to the text-based translator in the encoding tools.

Formats

The file-based tools accept whatever the browser can decode — WAV, MP3, OGG, FLAC and AAC in current browsers — and export WAV or MP3. Long files are processed in chunks so a full-length recording does not lock up the page, and the tools show progress while they work. Sample rate and channel count are preserved unless a tool exists specifically to change them.

Microphone and file access

The meter is the only tool that needs the microphone, and the browser asks before it is used. Files you load are decoded and processed on your device; nothing is recorded, uploaded or kept, and closing the tab discards everything.

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