DECODE. CONVERT. VERIFY.
BUILT FOR DEVELOPERS.
Free online tools for SSL certificates, SAML tokens, JWTs, and more. Most tools process your input in your browser. Live DNS and SSL checks send only the domain you enter for lookup.
Certificate & SSL
SSL decoders, CSR generators, certificate converters
SSL Certificate Decoder
Decode and inspect SSL/TLS certificates
CSR Decoder
Decode Certificate Signing Requests
Certificate Decoder
Inspect PEM certificates and certificate requests
PEM Decoder
Decode PEM-encoded certificates, keys, and CSRs
CSR Generator
Generate Certificate Signing Requests
SSL Checker
Check SSL certificate status for any domain
Certificate Key Matcher
Verify if a certificate and private key match
Self-Signed Cert Generator
Generate self-signed SSL certificates
SSL Converter
Convert between SSL certificate formats
PFX to PEM Converter
Convert PFX/PKCS#12 files to PEM format
CER to PEM Converter
Convert CER files to PEM format
CRT to PEM Converter
Convert CRT files to PEM format
PEM to CRT Converter
Validate a PEM certificate and save it with a CRT filename
PEM to PFX Converter
Convert PEM files to PFX/PKCS#12 format
DER to PEM Converter
Convert DER-encoded files to PEM format
Authentication & Tokens
JWT decoders, SAML tools, OAuth debuggers
SAML Decoder
Decode and inspect SAML responses and assertions
SAML Validator
Validate SAML response structure and conditions
JWT Decoder
Decode and inspect JSON Web Tokens
JWT Encoder
Create and sign JSON Web Tokens
OIDC Debugger
Debug OpenID Connect authorization flows
OAuth Token Inspector
Inspect and decode OAuth access tokens
TOTP Generator
Generate Time-based One-Time Passwords
PKCE Generator
Generate PKCE code verifier and challenge pairs
Cookie Decoder
Parse and inspect HTTP cookie strings
API Key Generator
Generate secure random API keys
Encryption & Decryption
AES, RSA, PGP encryption and decryption
AES Encrypt/Decrypt
Encrypt and decrypt text with AES algorithm
RSA Encrypt/Decrypt
Encrypt and decrypt with RSA public/private keys
DES Encrypt/Decrypt
Encrypt and decrypt text with DES algorithm
Text Encrypt/Decrypt
Simple password-based text encryption
File Encrypt/Decrypt
Encrypt and decrypt files with AES-256
PGP Encrypt/Decrypt
Encrypt and decrypt messages with PGP
PGP Key Generator
Generate PGP public/private key pairs
Fernet Encrypt/Decrypt
Python-compatible Fernet encryption and decryption
Blowfish Encrypt/Decrypt
Encrypt and decrypt with Blowfish algorithm
Password Generator
Generate cryptographically secure passwords
Hashing
SHA, MD5, HMAC, bcrypt hash generators
SHA-256 Hash Generator
Generate SHA-256 hashes from text or files
SHA-512 Hash Generator
Generate SHA-512 hashes from text or files
SHA-1 Hash Generator
Generate SHA-1 hashes from text or files
MD5 Hash Generator
Generate MD5 hashes from text or files
HMAC Generator
Generate HMAC authentication codes
HMAC-SHA256 Generator
Generate HMAC-SHA256 authentication codes
Bcrypt Generator
Generate and verify bcrypt password hashes
CRC32 Calculator
Calculate CRC32 checksums for data integrity
Argon2 Hash Generator
Generate Argon2 password hashes
Htpasswd Generator
Generate Apache htpasswd entries
Encoding & Decoding
Base64, URL, HTML, hex encoders and decoders
Base64 Encoder/Decoder
Encode and decode Base64 strings
Base64 File Encoder
Encode files to Base64 and decode back
Base64 Image Encoder
Convert images to Base64 data URIs
URL Encoder/Decoder
Encode and decode URL components
HTML Encoder/Decoder
Encode and decode HTML entities
Unicode Encoder/Decoder
Convert between Unicode escape sequences and text
Hex Encoder/Decoder
Convert between hexadecimal and text
ASCII Encoder/Decoder
Convert between ASCII codes and text
Binary Encoder/Decoder
Convert between binary and text
Morse Code Translator
Convert text to Morse code and back
ROT13 Cipher
Apply ROT13 letter substitution cipher
Base64URL Encoder/Decoder
URL-safe Base64 encoding and decoding
Number Converters
Hex, binary, octal, decimal converters
Hex to Decimal Converter
Convert hexadecimal numbers to decimal
Decimal to Hex Converter
Convert decimal numbers to hexadecimal
Binary to Decimal Converter
Convert binary numbers to decimal
Decimal to Binary Converter
Convert decimal numbers to binary
Hex to Binary Converter
Convert hexadecimal to binary
Binary to Hex Converter
Convert binary to hexadecimal
Octal to Decimal Converter
Convert octal numbers to decimal
Decimal to Octal Converter
Convert decimal numbers to octal
IP to Binary Converter
Convert IP addresses to binary notation
Hex to IP Converter
Convert hexadecimal to IP addresses
Data Formatters
JSON, XML, YAML formatters and converters
JSON Formatter
Format and beautify JSON data
JSON Validator
Validate JSON syntax and structure
JSON Minifier
Validate and compact JSON data
JSON to CSV Converter
Convert JSON arrays to CSV format
JSON to YAML Converter
Convert JSON to YAML format
JSON to XML Converter
Convert JSON to XML format
JSON to Table Viewer
Display JSON data as an interactive table
JSON Diff Checker
Compare two JSON objects and find differences
XML to JSON Converter
Convert XML to JSON format
YAML to JSON Converter
Convert YAML to JSON format
XML Formatter
Format and beautify XML data
XML Validator
Validate XML syntax and structure
Developer Utilities
UUID generators, cron builders, diff checkers
UUID Generator
Generate UUID v1, v4, and v7 identifiers
Slug Generator
Generate URL-friendly slugs from text
Cron Expression Generator
Build and explain cron schedule expressions
Unix Timestamp Converter
Convert between Unix timestamps and dates
Diff Checker
Compare two texts and highlight differences
String Length Counter
Count characters, words, lines, and bytes
Random IP Generator
Generate random IPv4 and IPv6 addresses
Network & IP Tools
Subnet calculators, DNS lookup, SSH key generators
Random MAC Generator
Generate random MAC addresses
SSH Key Generator
Generate SSH public/private key pairs
Subnet Calculator
Calculate subnet masks, network ranges, and hosts
CIDR Calculator
Calculate CIDR notation ranges and subnets
DNS Lookup
Look up DNS records for any domain
Browse by Category
Certificate & SSL
15 tools · SSL decoders, CSR generators, certificate converters
Authentication & Tokens
10 tools · JWT decoders, SAML tools, OAuth debuggers
Encryption & Decryption
10 tools · AES, RSA, PGP encryption and decryption
Hashing
10 tools · SHA, MD5, HMAC, bcrypt hash generators
Encoding & Decoding
12 tools · Base64, URL, HTML, hex encoders and decoders
Number Converters
10 tools · Hex, binary, octal, decimal converters
Data Formatters
12 tools · JSON, XML, YAML formatters and converters
Developer Utilities
7 tools · UUID generators, cron builders, diff checkers
Network & IP Tools
5 tools · Subnet calculators, DNS lookup, SSH key generators
Latest Guides
All guides →Convert CRT to PFX: Certificate, Private Key, and Chain
Create a PFX from a CRT with a matching private key and optional CA chain. Check PEM versus DER, verify the key pair, and use OpenSSL or the browser converter.
NetworkHow to Look Up DNS TXT Records for SPF, DKIM, and Verification
Find TXT records at the right hostname, read SPF and DKIM values, and troubleshoot missing verification records with TTL and resolver checks.
Data FormatsJSON vs JSONL: Format, Examples, and When to Use Each
Compare JSON arrays and JSON Lines with valid examples, streaming code, common parsing errors, and a quick way to validate each format.
Data FormatsJSONL to JSON: Convert Lines into an Array Safely
Turn newline-delimited JSON into a JSON array with Python or Node.js, reject malformed lines, and avoid common blank-line and memory mistakes.