Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
Hash & Security
Free online hash generators, encryption tools, password utilities, and security checkers. Generate MD5, SHA1, SHA256, SHA512, bcrypt, and more.
MD5 Hash Generator
Generate MD5 hash online for free
SHA1 Hash Generator
Generate SHA-1 hash online for free
SHA3 Hash Generator
Generate SHA-3 hash online for free
SHA256 Hash Generator
Generate SHA-256 hash online for free
SHA512 Hash Generator
Generate SHA-512 hash online for free
Multiple Hash Generator
Generate multiple hash types at once
Bcrypt Generator
Generate bcrypt password hashes online
Argon2 Hash Generator
Generate Argon2id password hashes
Password Strength Checker
Check and analyze password strength
Hash Type Identifier
Identify hash type from hash string
Salt Hash Generator
Generate salted password hashes online
Random Token Generator
Generate secure random tokens and keys
API Key Generator
Generate random API keys and secrets
AES Encryption & Decryption
Encrypt or decrypt data with AES cipher
RSA Key Generator
Generate RSA public and private key pairs
JWT Token Generator
Generate JSON Web Tokens with custom claims
JWT Token Verifier
Verify and decode JWT tokens online
SSL Certificate Checker
Check SSL certificate details and expiry
TOTP Authenticator Generator
Generate TOTP codes for 2FA setup
CRC32 Checksum Calculator
Calculate CRC32 checksum for data
PGP Key Generator
Generate PGP public and private key pairs
SSH Key Generator
Generate SSH key pairs online for free
CSR Generator
Generate Certificate Signing Requests online
HTML Sanitizer
Clean and sanitize HTML code safely
CSP Header Generator
Generate Content Security Policy headers
Security Headers Checker
Check HTTP security headers of any site
Password Leak Checker
Check if your passwords have been leaked
HMAC Generator
Generate HMAC signatures with hash algorithms
Hash Checker
Look up and verify hash values online
File Hash Checker
Calculate and verify file hash checksums
OpenSSL Command Generator
Generate OpenSSL commands for certificates
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