Encode & Crypto
17 tools
Base64 Encode/Decode
Convert text and Base64 both ways with correct UTF-8 Chinese; images preview as Base64.
URL Encode/Decode
Encode/decode URLs and parameter strings, for the whole URL or a single value.
Base Converter
Convert freely among binary, octal, decimal and hexadecimal, with big integers and bit view.
Color Converter
Convert HEX, RGB and HSL with a color picker and live preview; compare light/dark.
Unicode Converter
Convert Chinese and Unicode escape sequences both ways, supporting \uXXXX and \u{XXXXX}.
Random Password Generator
Batch-generate strong passwords with custom length and charset, plus strength estimate; local only.
WCAG Color Contrast
Check WCAG contrast ratio between foreground and background colors and whether AA/AAA pass.
QR Code Decoder
Upload an image with a QR code and decode it locally; the image is never uploaded.
AES Encrypt/Decrypt
Encrypt/decrypt text with AES-GCM; the key is derived locally from your password, nothing leaves the browser.
Password Strength Meter
Estimate password entropy and crack time, show the character pool and tips; local only.
Morse Code Converter
Convert between text and Morse code, with letters, digits and common punctuation.
Passphrase Generator
Build memorable, high-entropy passphrases from a built-in wordlist, with optional digits and symbols; local.
URL Safety Scan
Local heuristic scan for URL risks: plain HTTP, @ redirect, IP host, punycode, risky TLD, encoding obfuscation.
Username Generator
Generate random usernames from adjective+noun, with optional digits and separators; local.
Password Breach Check
Check a password against a built-in weak list and local rules (keyboard walk/sequence/repeat); no upload.
Password Audit
Audit a password in one go: strength (entropy) plus breach risks (weak list, keyboard walk, sequence, repeat); a full report.
Hash Verify
Compute MD5/SHA-1/SHA-256/SHA-512 of text and compare with an expected hash to verify integrity; local.