Validation & parsing

Extract metadata like duration, dimensions, file size, and format from video files.

Analyze and inspect X.509 SSL/TLS certificates. View certificate details including subject, issuer, validity period, extensions, key usage, and fingerprints.

Validate HTTP response and request headers against RFC standards. Check for syntax errors, deprecated headers, missing security headers, and common misconfigurations.

Validate and parse raw HTTP request text with detailed request metadata.

Test your iPhone front and rear cameras with live preview, resolution checks, and snapshots.

Identify the country of a phone number with flag display, calling code, and number validation

Parse and analyze SSH public keys. Extract key type, algorithm, key size, fingerprints (SHA-256, MD5), and comments from OpenSSH public keys.

Validate IATA airport codes and look up the matching airport details.

Validate ICAO airport codes and look up the matching airport details.

Validate sitemap XML files. Checks structure, namespace, URL format, lastmod dates, changefreq values, and priority ranges.

Check any YouTube video for community-submitted SponsorBlock segments (sponsor spots, intros, outros, and more).

Check the estimated like and dislike counts for any YouTube video, restored via the Return YouTube Dislike API.

Validate SPDX license identifiers, check for deprecated licenses, and browse the full list of standard open-source license IDs.

Enter a website URL and the server fetches and validates its robots.txt, showing sitemaps, crawl delay, and preferred host.

Preview how a URL will look when shared on Facebook, Twitter/X, LinkedIn and other platforms by inspecting its Open Graph and Twitter Card meta tags.

Fetch a page and check its hreflang tags for missing x-default, invalid language codes, duplicates, and self-referencing errors.

Enter a URL and the server fetches the page, extracts every JSON-LD structured data block, and checks it for JSON syntax errors, missing @context and @type, unknown schema.org types and properties, and fields Google needs for rich results.

Check how old a public GitHub repository is, when it was last pushed to, and its stars, forks and archive status.

Find any Steam account's SteamID64, SteamID, SteamID3 and account ID from a profile link, custom URL or ID, with its profile name and avatar.

Preview a resume.json in the JSON Resume format as a clean, readable resume and check it against the official schema.

See your resume the way an applicant tracking system reads it: the contact details, jobs, education and skills it finds in a PDF or DOCX, plus layout problems.

See where a Discord invite leads before joining: the server's name, icon, member and online counts, verified badge and expiry.

Check whether an email address comes from a disposable, temporary email service, and whether its domain has mail servers.

Check a website ads.txt or an app developer app-ads.txt file: which ad systems it authorizes, and which lines break the IAB format.