Developer Tools

Format, validate, and minify JSON code online. Instantly prettify messy JSON, fix syntax errors, and explore data in tree view, free, no signup.

Convert JSON to CSV or CSV to JSON online. Flattens nested objects & arrays, unions all keys, supports comma/semicolon/tab/pipe delimiters and type inference, free, live, runs locally.

Free JSON to TypeScript converter. Generate interfaces or types from JSON with nested objects, arrays and unions inferred automatically, copy the result, no signup.

All-in-one CSS generator with 21 tools: triangle, arrow, gradient, box-shadow, glassmorphism, neumorphism, loader, tooltip, clip-path, filter, transform, animation, flexbox, grid & variables, live preview, copy & download, free.

Free color converter: HEX to RGB, RGB to HEX, plus HSL, HSV, CMYK and alpha. Live sliders, color picker, EyeDropper, saved swatches, harmonies, WCAG contrast, colour-blindness preview and code export, no signup, runs locally.

Convert images to Base64 strings for embedding in CSS or HTML. Generate data URIs for icons and logos without external HTTP requests, free, local processing.

Free online hash generator. Create MD5, SHA-1, SHA-256, SHA-512, SHA-3 and RIPEMD-160 checksums, HMAC signatures and verify hashes, computed locally in your browser, no signup.

Free UUID generator for v4, v7 and NIL. Create unique identifiers in bulk with uppercase, hyphen-free and brace options, then copy or download, runs locally, no signup.

Free URL encoder & decoder. Percent-encode or decode URLs and query strings with encodeURIComponent or encodeURI, and inspect query parameters, instant, no signup.

Decode, verify, and generate JWT tokens online. Inspect payload claims with human-readable timestamps, detect expiry, verify HS256/HS384/HS512 signatures, and create signed tokens, all locally in your browser.

Generate QR codes for URLs, WiFi passwords, contact cards, and text. Add custom logos, choose colors, and download as SVG or PNG, free, no signup.

Generate professional barcodes online. Create CODE128, EAN-13, UPC-A, and CODE39 barcodes and download as SVG or PNG, free, no server upload.

All-in-one SVG toolkit: wave, blob, pattern, polygon, spiral & star generators plus SVG optimizer, minifier, cleaner, path editor, color replacer & sprite generator, live preview, copy & download, free.

Test REST APIs in your browser. Send GET/POST/PUT/PATCH/DELETE with query params, custom headers, Bearer/Basic/API-key auth, and inspect response headers, status, timing & size, a free Postman alternative.

Free online regex tester. Write JavaScript regular expressions and see live highlighted matches, capture groups, flags and a replace preview, instant, no signup.

Look up A, AAAA, MX, TXT, NS, CNAME and SOA DNS records for any domain instantly, resolved live via Google Public DNS, free, no signup.

Parse any user-agent string and display the browser, engine, OS, device and bot details instantly. Colour-coded UA anatomy, headless/automation detection, live Client Hints, inspect your own UA, and export JSON, free, private, runs in your browser.

Validate any phone number and build a WhatsApp click-to-chat link, QR code, and vCard, then open it in WhatsApp to confirm the number is registered and view their profile photo. Free, private, no signup.

Write HTML and see the live preview instantly. Responsive device widths, Monaco syntax highlighting, Prettier formatting, autosave, copy and one-click HTML/PDF export, free, no signup.

Essential developer tools in one place. URL encode/decode, Base64 text conversion, and live Regex testing, all running locally in your browser.

Free Unix timestamp converter. Convert epoch time to date and date to timestamp in seconds or milliseconds, with UTC, local and ISO 8601 output, runs locally.

Free cron expression generator and explainer. Build cron schedules, read them in plain English, use common presets and preview the next run times, no signup.

Free WCAG color contrast checker. Test text and background colors for AA and AAA accessibility compliance with a live contrast ratio and preview, hex or RGB.

Free redirect generator. Convert old→new URL pairs into Nginx, Apache .htaccess, Netlify or Vercel redirect rules with 301 or 302 codes, copy or download.

Add a free WhatsApp chat button, or a multi-channel contact widget, to any website. Combine WhatsApp, Messenger, Telegram, Instagram, phone, email, SMS and custom links in one floating launcher, customize the design, greeting and behavior, then copy a single lightweight snippet that works on HTML, WordPress, Shopify, Wix, Webflow and React.