Web & SEO Tools

ASCII table ASCII codes 0-127 with decimal, hex and binary. Search and copy in one click. SHA Hash Calculator SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, with instant comparison. Password strength checker Test how secure your password is: entropy and crack time, all in your browser. Regex Tester Test patterns and flags: highlighted matches, captured groups and replacements. Google preview (SERP) Will your title and description fit the results? What browser am I using Browser, version, OS, language and user agent: copy it all for tech support.

ASCII table ASCII codes 0-127 with decimal, hex and binary. Search and copy in one click. Base64 encoder & decoder Encode text to Base64 or decode it back, with full UTF-8 and emoji support. Clean up a CSV Fix a messy CSV: separator, spaces, empty rows and columns, duplicates and numbers. Click speed test How many clicks per second? 5 or 10 second CPS test with your personal best. Cron expressions Type the cron expression and read in plain words when it runs, with the next runs. CSS Minifier Minify CSS in one click: strips comments and whitespace, shows bytes saved. CSV to Excel Open a CSV in Excel without losing leading zeros and without everything landing in one column. CSV to HTML table Paste CSV: get a live table preview and clean HTML table code to copy. CSV to JSON Turn CSV into a JSON array: delimiter auto-detected, copy or download free. CSV to SQL Turn a CSV into CREATE TABLE and INSERT for MySQL, PostgreSQL, SQLite and SQL Server, without losing leading zeros. Dead pixel test Check monitors and TVs full-screen Emoji list, copy and paste 1,906 emoji from the Unicode list, with search, categories and skin tone: one click copies it. Excel (XLSX) to CSV Open an .xlsx file without Office: pick a sheet and download it as CSV. Extract code from AI Out of an AI answer come the files, with the right name and all in one .zip. And the mangled characters fixed. File checksum (MD5, SHA-256) Compute MD5, SHA-1, SHA-256 and SHA-512 of a file and check it against the published value. Google preview (SERP) Will your title and description fit the results? HTML table generator Create HTML tables from your data JSON formatter & validator Format, minify, and validate JSON with precise errors and key sorting JSON to CSV Convert a JSON array to CSV with your chosen delimiter and instant download. JSON to TypeScript TypeScript interfaces or types and a JSON Schema from JSON, with optional fields worked out from every element. JWT decoder Decode a JWT's header and payload with readable dates and expiry warning. Key code tester (keycode) Press a key to see key, code and keyCode with modifiers and history. Keyboard test Find broken keys in seconds Merge two CSV files Stack two CSV files realigning the columns, or match them on a key column like a VLOOKUP. Password strength checker Test how secure your password is: entropy and crack time, all in your browser. px ⇄ rem converter Convert pixels to rem and em (CSS) Reaction time test Wait for green and click: reaction time in ms, averaged over 5 attempts. Regex Tester Test patterns and flags: highlighted matches, captured groups and replacements. Repair JSON Fixes broken JSON from a chat, a log or a hand-written file and lists every change, even when cut off robots.txt Generator Build your robots.txt with Allow/Disallow rules, sitemap and presets. Screen resolution checker Live viewport, screen resolution, pixel ratio, orientation and color depth. SHA Hash Calculator SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, with instant comparison. Special characters to copy Arrows, math symbols, currencies, check marks and stars to copy in one click. Split a CSV that is too big Split a huge CSV into smaller files, with the header repeated and without loading it all. SSL certificate decoder Expiry in days, covered names (SAN), key, fingerprints and chain order of a certificate or a CSR. Subnet calculator (CIDR) From 192.168.1.0/24 to network, broadcast, hosts, mask and wildcard. IPv6 too, the host→prefix direction and splitting into subnets. Typing speed test Measure your words per minute in 60 seconds: accuracy, errors, personal best. URL encode & decode Percent-encode or decode text, plus inspect any URL's query parameters. UTM Link Builder Create tracked campaign URLs with UTM parameters, properly encoded. UUID Generator Generate secure random UUID v4s: quantity, uppercase, with or without dashes. What browser am I using Browser, version, OS, language and user agent: copy it all for tech support. WiFi QR code Guests connect to the WiFi with one scan. XML sitemap generator Paste your site's URLs and download a valid sitemap.xml, ready for Google. XML to JSON and back Convert XML to JSON or JSON to XML, with syntax errors pinned to line and column. YAML to JSON Convert YAML to JSON and back, with errors on the right line and the values YAML 1.1 reads another way.