Privacy & security
Passwords, hashes, encryption and redaction
10 tools
- Secure Password Generator (cryptographic, unbiased)Create random passwords in your browser with a cryptographically secure, unbiased generator (crypto.getRandomValues). Choose length, character types and look-alike exclusion, and see the entropy.
- Password Strength Checker (guessability and crack time)Estimate how guessable a password is from its length, character types, common passwords, keyboard runs, sequences and dates, with crack-time ranges. Runs in your browser; nothing is sent or saved.
- UUID Generator and Inspector (bulk UUID v4)Generate up to 10,000 random version 4 UUIDs at once with crypto.randomUUID(), then copy them or save a TXT file. Paste any UUID to see its version, variant and embedded time.
- File Checksum Calculator (SHA-256 / SHA-512)Calculate SHA-256 and SHA-512 checksums of a file or text in your browser and check them against a published hash. Files are never uploaded.
- Text Encryption & Decryption (AES-256-GCM with a password)Encrypt and decrypt text with a password using AES-256-GCM and PBKDF2 in your browser. Random salt and nonce, tamper detection, and nothing is sent or stored.
- Personal Data Redaction for TextFind and mask email addresses, phone numbers, card numbers, Japanese My Number, Taiwan IDs, IP addresses and URLs in text. Runs entirely in your browser; nothing is sent or saved.
- Suspicious URL Structure Checker (@, IP, Punycode, short links)Paste a URL to list structural features such as “@” tricks, numeric IP hosts, Punycode and mixed scripts, URL shorteners and double extensions. It never opens the link and gives no safety verdict.
- Secret Scanner (API keys and tokens)Find API keys, tokens, private keys, password-like values and email addresses hidden in config files or logs, with line numbers and highlights. Runs entirely in your browser; nothing is saved or sent.
- Image Redaction (blur, pixelate or black out parts of an image)Hide faces, addresses or numbers in photos and screenshots with a solid fill, pixelation or blur. The exported image is re-encoded without GPS or other metadata, all inside your browser.
- Local Data Manager (view and delete this site’s saved data)See everything YUCTS Tools saved in this browser — theme, recently used tools, lists and drafts — grouped by tool. Export it as JSON, delete single items, or clear it all after confirming.
More tools are being released step by step.