UD5 Toolkit
Harmonica Key Transposer – Online Find Correct Harp for Song
Enter the song's key and playing position (straight/cross harp) to determine which harmonica key to use.
Tag: Encryption Key Generator
10+ toolsSSL Certificate & Key Pair Matcher - Online Verify Match
Paste an SSL certificate and private key to verify they belong together. Check if a CSR matches a private key. All local crypto.
SSH Key Fingerprint Viewer – Online MD5 & SHA256 Hash
Paste a public SSH key to generate its fingerprint. Verify host keys. Local Web Crypto.
JSON Duplicate Key Checker – Online Find Repeated Keys
Paste JSON and instantly see if any object has duplicate keys. Quick syntax spotter.
Morse Code Oscillator & Key - Online Practice CW
Use your keyboard or mouse as a straight key. Hear the tone and see the dots/dashes. Perfect for learning CW. Local.
PGP Key Pair Generator - Online OpenPGP in Browser
Create a PGP key pair (RSA or ECC) directly in your browser with passphrase protection. Export public/private armored keys. No upload.
Random Crypto Key Generator - Online Create API Tokens & Secrets
Generate strong random strings for API tokens, session secrets, or encryption keys. Uses crypto.getRandomValues().
Web Crypto Key Generator - Online Generate RSA/EC Keys
Generate cryptographic key pairs using the Web Crypto API. Export as JWK or raw. No server needed; pure security.
Keyboard Event Debugger - Online See keydown Key Data
Press any key and see the full KeyboardEvent object: key, code, keyCode, modifier status. Dev tool.
Morse Code Key Trainer - Online Straight Key Simulator
Practice sending Morse code using a virtual straight key. Visual feedback and audio tone. Learn timing and proper fist.