Random Password Generator
Generate secure random passwords with letters, numbers, and symbols in one click.
Passphrase Generator
Generate long, memorable passphrases in the browser by combining multiple random words.
Japanese Sentence Passphrase Generator (Romaji)
Generate passphrases based on short Japanese-like sentences and output them in romaji.
UUID Generator
Create unique v4 UUIDs instantly.
Advanced Hash Generator Tool
Generate hashes with SHA-256 / SHA-384 / SHA-512 / SHA-512/256, SHA3-256 / SHA3-512, BLAKE2b-256 / BLAKE2b-512, Keccak, and legacy compatibility algorithms such as MD5, SHA-1, and RIPEMD160. Supports HMAC, Base64 output, file input, copy, and download.
QR Code Generator
Convert text or URLs into QR codes with SVG/PNG/JPEG download, 24-hour shareable links, Data URL copy, and customization for size, margin, colors, and error correction (L/M/Q/H).
SSL/TLS Checker
Enter a domain to inspect expiry, SAN, issuer, chain, OCSP/CRL, and cipher/protocol in one shot. Lightweight summary first, detailed cards on demand.
CSR Generator & Linter
Create RSA/ECDSA keys and CSRs with CN/SAN, or paste an existing CSR to extract SAN, KeyUsage, and signature algorithm.
Certificate Decoder
Paste or upload PEM/DER/PKCS#7/PKCS#12 and extract expiry, SAN, KeyUsage/ExtKeyUsage, fingerprints, OCSP/CRL URLs.
Key & Certificate Matcher
Verify that a server certificate matches its private key and highlight missing or misordered intermediates.
Signature Algorithm & Strength Assessor
Analyze certificates or CSRs, score RSA key length / ECDSA curve / signature hash strength, and suggest improvements.
OCSP / CRL Status Checker
Call OCSP in real time using the certificate and issuer to see revocation status, responder, and This/Next Update. CRL URLs are also shown.
Client Insight
Inspect browser details, IP, and location directly in the browser. Nothing is stored; everything stays on this page.
Encode/Decode tool
Conversion tool that supports Base64, URL, HTML encoding, etc.
JSON Formatter / Validator
Browser-based JSON formatter, minifier, and validator. Invalid JSON shows an approximate error line and column.
JSON to CSV Converter
Browser-based JSON to CSV converter with direct download. Arrays of objects become rows, and nested keys are flattened with dot notation.
Unit Converter
Convert data size, volume, length, weight, temperature, area, speed, and time in one place. Supports KB/MB/GB, L/mL, km, kg, °C/°F, and more.
SAML Request/Response Analysis Tool
A free tool that Base64 decodes SAML requests and responses and displays them as formatted XML.
Unix Time Converter Tool
Convert between Unix timestamps and date/time with timezone offsets and history support.
Subnet Mask Calculator
Calculate IPv4 network, broadcast, wildcard masks, and usable host ranges from IP and CIDR.
Related guides
What Is My IP?
Show the IP address currently visible to this site right away. Includes IPv4/IPv6 detection, HTTPS status, and proxy-related headers.
DNS Lookup & Propagation Checker
Query A/AAAA/CNAME/MX/TXT/CAA records across Google, Cloudflare, Quad9, and OpenDNS to compare propagation and answer differences.
Mail DNS Authentication Checker
Check SPF, DMARC, and DKIM public keys for a domain in one place. Review published records, policy mode, key size, and common setup issues.