Website Uptime Monitor
Free website uptime monitor. Check if your site is up or down and set scheduled monitoring with SSL checks and email alerts.
Monitor uptimePingfloat is a bunch of useful web tools.
Monitoring, debugging, formatting, scheduling, timestamps, and quick daily dev work.
Monitor
SSL Checker
Free SSL certificate checker. Check certificate expiry, issuer, and TLS version for any domain. Instant SSL check — no install or account required.
Check SSL certificateTraceroute
Trace the network path from a network runner to any hostname or IP. See each hop, RTT latency, and identify where packet loss or slowdowns occur.
Trace routeUtility
File Sharing & Secure File Transfer
Share files online with gated lead capture or secure single-use transfer. Send large files by email or share with a link — free file sharing for teams.
Share a fileQR Code Generator
Free QR code generator. Create a QR code for any URL — no expiration. Sign in for managed QR codes with editable destinations and click tracking.
Generate a QR codeWhat's My IP
What is my IP address? See your public IP, location, IPv4 address, and browser details instantly. Create tracked share links to capture visitor IP data.
See my IP →What's My User Agent
Instantly see your browser, OS, and device from your User-Agent string. Create tracked share links to capture visitor browser data for debugging.
See user agent →Password Generator
Free random password generator. Create strong, secure passwords with custom length and character sets — generated locally, never sent anywhere.
Generate a password →Regex Tester
Test regular expressions against sample text with live match highlighting and capture groups, entirely in your browser.
Test a regex →Redirect Rule Generator
Free redirect rule generator for Nginx and Apache. Create 301, 302, 307, or 308 redirect config for a specific path, HTTPS, www, or a full domain migration.
Generate redirect rules →Convert
Base64 Encoder / Decoder
Instant text encoding and decoding, with saved snippets for signed-in users.
Encode or decode text →JSON Formatter
Format, validate, minify, and escape JSON.
Format JSON →Unix Timestamp Converter
Convert timestamps and dates instantly.
Convert unix time →Timezone Converter
Compare timezones and convert dates between regions.
Convert timezones →Color Picker
Inspect and convert colors across HEX, RGB, HSL and CSS snippets.
Pick a color →Cron Expression Generator
Turn cron expressions into human-friendly descriptions and save useful schedules.
Cron expressions →Image Converter
Convert HEIC, PNG, JPG, WEBP, ICO, and PDF images entirely in your browser — no upload, works on multiple files at once.
Convert an image →Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text, entirely in your browser.
Generate a hash →UUID / ULID Generator
Generate random UUID v4 (GUID) and ULID identifiers, one at a time or in bulk, entirely in your browser.
Generate an ID →JWT Decoder
Decode a JSON Web Token's header and payload into readable JSON, entirely in your browser. Does not verify the signature.
Decode a JWT →Validate
HTML Validator
Validate pasted HTML or a live URL for markup issues and common best-practice problems.
Validate HTML →CSS Validator
Validate pasted CSS, a stylesheet URL, or a live page with inline and linked stylesheets.
Validate CSS →Meta Tag Checker
Validate a live URL for title, description, canonical, robots, viewport, and other key meta tags.
Validate meta tags →Open Graph Checker
Validate Open Graph and Twitter card tags on a live page before you share it.
Validate social tags →Schema Markup Checker
Validate JSON-LD schema on a live page and see which structured data types are present.
Validate schema →Sitemap Checker
Find sitemap files from a domain or sitemap URL, parse nested sitemap indexes, and count the URLs they expose.
Inspect sitemap →Response Headers Inspector
Check a URL's raw HTTP response headers, gzip/brotli compression, cache status, and security headers (CSP, HSTS, and more).
Inspect headers →null
MCP Server
Free remote MCP server for Claude, Cursor, and other MCP-compatible AI assistants — check meta tags, Open Graph, and schema markup, generate QR codes, and create capture links.
View MCP docs →Public API
Free public HTTP API for QR code generation and page checks (meta tags, Open Graph, schema markup). Requires a free API key.
View API docs →Reference
HTML Entities
Browse common HTML entities, symbols, named references, and numeric codes.
Browse entities →HTTP Status Codes
Look up HTTP status codes with plain-language meaning and SEO impact notes.
Browse status codes →HTML Validation Issues
What each HTML Validator issue means, why it matters, and how to fix it — with links to the WHATWG HTML spec and MDN.
Browse HTML issue reference →CSS Validation Issues
What each CSS Validator issue means, why it matters, and how to fix it — with links to MDN's CSS documentation.
Browse CSS issue reference →DNS Record Types
Complete DNS record types reference — A, AAAA, CNAME, MX, NS, SOA, TXT, and PTR. Learn what each record does and how to do a DNS lookup with nslookup.
Browse DNS records →Networking
Reference pages covering IP addresses, IPv4, IPv6, subnets, CIDR notation, and the subnet calculator.
Browse networking reference →User Agents
Reference pages covering common browser user agent strings and how to identify search engine and AI crawlers like Googlebot and GPTBot.
Browse user agent reference →