Tools

In-browser utilities — fast, private, and free. Nothing you enter leaves your browser.

Developer tools

In-browser utilities for everyday development — encoders, decoders, and generators.

  • Base64 Encode / Decode Encode and decode Base64 right in your browser — text in, Base64 out, and back. Nothing you type ever leaves your device.
  • JWT Decoder Decode a JSON Web Token in your browser — see its header, payload, and signature, with exp/iat/nbf humanized. Nothing you paste ever leaves your device.
  • JWT Secret Generator Generate a cryptographically strong HS256 secret and sign a JWT with it, entirely in your browser. The secret, payload, and token never leave your device.
  • QR Code Generator Turn any text or URL into a QR code right in your browser and download it as a PNG or SVG. Generation is fully client-side — nothing is uploaded.
  • SSH Key Generator Generate an SSH keypair (Ed25519 or RSA) right in your browser, with the public key in authorized_keys format and the private key in OpenSSH format. Everything happens client-side — the private key never leaves your device.

Audio tools

In-browser audio utilities — tone generation and sound experiments.

  • Signal Generator Generate tones, sweeps, and noise in your browser — pick a waveform (sine, square, sawtooth, triangle), dial in a frequency, run a linear or log sweep, or switch to white or pink noise. All processing happens on your device.
  • Spectrogram Art Type text and synthesize audio whose spectrogram displays that text — load the result into the Visualizer's spectrogram mode and see your words appear as an image in the frequency spectrum. All synthesis happens on your device; nothing is uploaded.
  • Tone Generator Play a pure 440 Hz sine tone right in your browser, with a live waveform. Audio starts only when you press play and stops the moment you leave.
  • Tuner Detect the pitch of your instrument or voice in real time — see the nearest note, frequency in Hz, and how many cents sharp or flat you are. Mic audio stays on your device.
  • Visualizer Visualize audio in real time — pick mic input, an uploaded audio file, or the signal generator output as your source, then switch between waveform, spectrum, and scrolling spectrogram views. All processing happens on your device; nothing is uploaded.