Encoding and Security Online Tools
Free online encoding and security including JSON formatter, text compare, hash generator, Base64 encoder, URL parser, and more. With 25 IO Tools helps you quickly format, convert, encode, and work with data directly in your browser. Most tools run locally for speed and privacy, and most tool inputs are not stored on our servers. Some features that require storage (for example, Quick Paste) store data only to provide that feature. Built to keep useful tools simple, fast, and all in one place - dmlub2Ro
Encoding and Security
25 tools
Base64 Encode and Decode
Encode and decode UTF-8 text using Base64 safely in browser.
Base32 Base58 Base58Check Converter
Convert text and bytes between Base32, Base58, and Base58Check with checksum validation.
URL Encoder and Decoder
Convert URL components between readable and encoded forms.
HTML Encoder and Decoder
Encode and decode HTML entities safely for markup and debugging.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes.
SHA256 Generator
Generate SHA-256 hashes quickly for integrity checks.
HMAC Generator
Generate keyed HMAC signatures with SHA-256, SHA-384, and SHA-512.
Password Strength Checker
Evaluate password quality with practical security feedback.
Unicode Converter
Convert plain text to Unicode escape sequences and decode back instantly.
JWT Decoder
Decode JWT header and payload locally without sending data out.
JWT Encoder
Create signed HS256 JWT tokens locally from JSON payload and secret.
JWT Verifier
Verify JWT signatures for HS, RS, and ES algorithms using secret, PEM key, or JWKS.
PEM X.509 Certificate Decoder
Decode PEM and X.509 certificate details including issuer, subject, validity, SAN, and key metadata.
Secure Compare Tool Online
Compare two values safely with optional normalization.
Password Policy Tester
Test passwords against configurable policy rules including length, case, digits, and symbols.
Password Entropy Calculator
Calculate entropy bits and strength level for passwords.
TOTP Generator
Generate time-based OTP codes from Base32 secret keys.
Webhook Signature Verifier
Verify webhook signatures using HMAC algorithms.
PBKDF2 Key Generator
Derive secure keys from passwords using PBKDF2.
AES GCM Encrypt Decrypt
Encrypt and decrypt text using AES-GCM locally.
CRC32 Checksum Calculator
Calculate CRC32 checksum values for text input.
JWT Timeline Inspector
Inspect JWT timeline claims like iat, nbf, and exp.
Cookie Parser
Parse Cookie header values into key-value pairs.
Set Cookie Parser
Parse Set-Cookie headers into structured attributes.
Base64 Inspector
Decode Base64 and inspect bytes, text preview, and JSON payloads.