UtilityBaseDeveloper Tools
Developer tools cover the quick conversions that interrupt real work: pretty-printing a JSON blob from a log, decoding a Base64 token, URL-encoding a query parameter, and translating Unix timestamps into readable dates. All processing is local, which matters when the data you're inspecting is sensitive.
What Is My IP
Your public IP, and exactly what it reveals, location, ISP, timezone.
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Regex Tester
Test regular expressions live with match highlighting, groups, and a cheat sheet.
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Code Playground
A live HTML, CSS & JS editor with instant preview, console, and shareable links.
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SEO Analyzer
Instant on-page SEO audit of any URL. 23 checks, scored, with plain-English fixes.
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JSON Formatter
Format, validate, and minify JSON with precise error locations.
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SQL Playground
Run real SQL in your browser, a live SQLite database with a sample schema.
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Website Down Checker
Is it down, or is it just you? Checked from our server with status and timing.
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Mermaid Diagram Editor
Turn Mermaid text into live flowcharts, sequence, class, ER, and Gantt diagrams.
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Webhook Tester
Get a unique URL and watch incoming webhook requests arrive live.
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Color Contrast Checker
Check WCAG contrast ratios between text and background colors, AA and AAA.
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QR Code Scanner
Scan a QR code from your camera or an uploaded image and read its content, all in your browser.
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WHOIS Lookup
Domain age, registrar, expiry, and nameservers via RDAP, WHOIS's successor.
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DNS Lookup
Query A, AAAA, CNAME, MX, TXT, and NS records over DNS-over-HTTPS.
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Email Checker
Verify an address can receive mail, syntax, domain, MX, disposables, typos.
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ASCII Table
Full ASCII reference, decimal, hex, octal, binary, HTML entity, and control-code names.
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JSON to TypeScript Converter
Paste JSON, get clean TypeScript interfaces, nested objects and arrays typed.
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SSL Checker
Certificate validity, issuer, expiry countdown, and covered names for any host.
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IP Address Lookup
Find the approximate location, ISP, and timezone of any IP address, or your own.
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Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text, live.
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CSV to JSON Converter
Convert CSV to JSON and JSON back to CSV, quotes and commas handled properly.
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Subnet Calculator
IPv4 CIDR calculator, network, broadcast, host range, masks, all copyable.
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SQL Formatter
Format messy SQL into readable, consistently indented queries, locally.
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Data Storage Converter
Convert between bytes, KB, MB, GB, TB, and PB, with binary and decimal modes.
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Binary Translator
Convert text to binary and back, plus a decimal/hex/binary/octal converter.
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HTML Formatter
Beautify or minify HTML in your browser, with byte savings shown on minify.
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JavaScript Beautifier
Beautify messy or minified JavaScript, or minify it with Terser, byte savings shown.
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Flexbox Generator
Set flexbox properties visually with a live preview and copy the CSS.
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JWT Decoder
Decode JWT tokens locally, header, payload, and human-readable claims.
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Image to Base64 Encoder
Convert an image to a Base64 data URI for embedding in HTML, CSS, or JSON. With copy-ready formats.
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CSS Minifier
Minify CSS to shrink your stylesheet, or beautify it, with byte savings shown.
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Meta Tag & Open Graph Generator
Generate SEO, Open Graph, and Twitter Card meta tags with a live social preview and length warnings.
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CSS Grid Generator
Build a CSS grid layout visually, columns, rows, and gaps, and copy the CSS.
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PX to REM Converter
Convert between px, rem, and em with an adjustable base, plus bulk and a reference table.
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Cubic Bezier Generator
Design a CSS easing curve by dragging the control points, preview the motion, and copy the value.
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Discord Timestamp Generator
Create Discord <t:…> timestamp codes that show in everyone's own time zone.
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HTTP Status Code Reference
Every status code that matters, explained in one plain-English line, searchable.
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Number Base Converter
Convert between binary, hex, decimal, and octal, with the hand method shown.
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Ohm's Law Calculator
Enter any two of voltage, current, resistance, or power and get the other two instantly.
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Border Radius Generator
Design rounded corners or organic blob shapes and copy the CSS border-radius, with a live preview.
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XML Formatter & Converter
Beautify or minify XML, and convert between XML and JSON, with inline error reporting.
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Markdown Table Generator
Build a table in a grid and get clean Markdown (and HTML). Paste from Excel or CSV.
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Timestamp Converter
Convert Unix timestamps to human dates and back, seconds or milliseconds.
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YAML to JSON Converter
Convert YAML to JSON and JSON to YAML in your browser, with inline parse errors.
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Schema Markup Generator
Fill a form and get valid JSON-LD structured data for Article, Product, FAQ, and more.
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Cron Expression Explainer
Explain a cron expression in plain English, or build one from a schedule with no syntax to memorize.
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Code Case Converter
Convert identifiers between camelCase, snake_case, kebab-case, PascalCase, and more.
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Base64 Encoder / Decoder
Encode text to Base64 or decode it back, full Unicode support.
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Chmod Calculator
Unix file permissions visually: rwx checkboxes ⇄ octal ⇄ symbolic notation.
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Hex to RGB Converter
Convert colors between HEX, RGB, and HSL. Edit any field and the rest update.
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Glassmorphism Generator
Design a frosted-glass card with live preview and copy the CSS.
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JSON Viewer
Explore JSON as a collapsible, color-coded tree, expand and collapse any node.
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Clip-Path Generator
Pick a clip-path shape and copy the CSS, with a live preview.
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CSS Gradient Generator
Build a linear or radial CSS gradient visually and copy the ready-to-paste code.
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CSS Box Shadow Generator
Design a box-shadow visually with sliders and copy the CSS instantly.
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User Agent Finder
See your browser's user-agent string and a parsed breakdown of browser, OS, and engine, one-click copy.
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Font Previewer
Type a sentence and preview it live across two dozen popular Google Fonts.
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URL Encoder / Decoder
Percent-encode text for URLs or decode encoded URLs back to readable text.
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HTML Entity Converter
Encode special characters to HTML entities and decode them back.
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HTML Stripper
Remove all HTML tags from text, leaving clean plain text.
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Frequently asked questions
Is it safe to paste API responses or tokens here?
All developer tools run entirely in your browser and transmit nothing. That said, treat production secrets carefully anywhere, including your clipboard.