Utilities
Tools
Developer, security, and SEO utilities. Client-side tools stay in your browser; server-side checks only inspect publicly accessible website data.
Client-side
Runs in your browser. No data sent.
Password generator
Generate cryptographically secure passwords in your browser.
Password strength checker
Estimate password strength locally without sending the password anywhere.
CSP generator
Generate a starter Content-Security-Policy header for modern websites.
Hash generator / verifier
Generate and verify MD5 and SHA hashes locally in your browser.
CSR generator
Create an OpenSSL CSR config and command without exposing private keys.
Certificate decoder
Decode public PEM certificate metadata locally in your browser.
Base64 encode / decode
Encode and decode Base64 with Unicode and URL-safe support.
Base64 image converter
Convert images to Base64 data URLs and preview Base64 images locally.
URL encoder / decoder
Percent-encode and decode URL components locally.
JSON formatter
Format, validate, and inspect JSON without sending it anywhere.
JSON to YAML
Convert JSON documents to YAML locally in your browser.
YAML to JSON
Convert YAML documents to formatted JSON locally in your browser.
JWT decoder / generator
Decode JWTs and generate HS256 test tokens locally in your browser.
Regex tester
Test regular expressions with live matches and groups.
UUID generator
Generate UUID v4 identifiers using the browser Web Crypto API.
Unix timestamp converter
Convert Unix timestamps to ISO dates and back.
Cron expression parser
Parse cron expressions and preview upcoming run times.
Robots.txt generator
Generate a starter robots.txt file with sitemap and crawl rules.
Public website checks
Validated public HTTPS targets only. No intrusive scanning.
Sitemap validator
Validate a public HTTPS sitemap and inspect sanitized entries.
Meta tag checker
Inspect public title, description, canonical, robots, OG, and Twitter tags.
Open Graph preview
Preview sanitized Open Graph metadata for any public HTTPS page.
TLS certificate validation
Inspect public TLS certificate metadata, expiry, SANs, and cipher details.
DNS lookup
Query public A, AAAA, MX, TXT, CNAME, NS, SOA, and CAA records.
HTTP security headers
Inspect public HTTP response headers and configuration posture.