Free Online Developer Tools to Boost Your Productivity
Explore a collection of fast, free, and easy-to-use developer tools built for modern workflows. Whether you're working with JSON, APIs, CSS layouts, or debugging code, these tools help you save time and work smarter — right in your browser.
Password Generator
Secure & entropy-scoredGenerate cryptographically secure passwords, passphrases, PINs, and memorable passwords. Live entropy meter, crack-time estimate, bulk generation, and copy history.
QR Code Generator
Custom styles & logoGenerate QR codes for URLs, WiFi, email, SMS, vCard, and phone. Custom dot styles, colors, gradients, logo upload. Download PNG or SVG.
JSON Formatter
Format & validateFormat, validate, minify, and syntax-highlight JSON. Live parsing with sort keys and download support.
HTML Formatter
Prettify HTML, CSS & JSPaste HTML and format it instantly with proper indentation. Prettifies inline <style> CSS and <script> JS. Line numbers + history.
Tailwind Formatter
Sort & group classesSort, deduplicate, and group Tailwind CSS classes by category. Flat and grouped output views.
JSON Table Viewer
Tabular JSON explorerVisualize JSON arrays as tables. Filter, sort, paginate, toggle columns, and export as CSV.
Diff Checker
Compare text & codeCompare two texts side-by-side with LCS-based diffing. Split, unified, and char-level inline modes.
Responsive Preview
Test any screen sizePreview any website at 8 screen sizes from 320px mobile to 1920px wide. Zoom controls and device tabs.
CSS → Tailwind
Convert CSS to utilitiesPaste CSS and get the equivalent Tailwind utility classes instantly. Handles spacing, colors, typography, flexbox, grid, borders, and more — with arbitrary value fallbacks.
Tailwind → CSS
Expand utilities to CSSPaste Tailwind utility classes and get the equivalent CSS declarations. Supports all spacing, color, typography, flex, grid utilities — plus arbitrary values and responsive/state variants.
HTML → JSX Converter
Convert HTML to ReactConvert HTML to React JSX. Handles className, htmlFor, camelCase events, self-closing tags, and inline styles.
REM ↔ PX Converter
Base font size calculatorBidirectional REM and PX conversion with custom base font size. Live preview and reference table.
API Request Generator & Tester
Generate · Test · 12 langsGenerate HTTP request code in 12 languages and test APIs live in the browser — Fetch, Axios, XHR, Node.js, cURL, Python, PHP, Ruby, Go, C#, Jest, Pytest. GraphQL, env vars, history & Postman import.
Meta Tag Generator
SEO · OG · Twitter · JSON-LDGenerate complete meta tag sets from page details. Live Google SERP, Facebook OG, and Twitter card previews. Export as HTML, Next.js metadata, React Helmet, Vue/Nuxt, Astro, or JSON-LD.
Media Queries Generator
CSS · SCSS · Tailwind · JSGenerate CSS media queries with Bootstrap, Tailwind, or MUI breakpoints. Add dark mode, reduced motion, print, and retina feature queries. Export as CSS, SCSS mixins, Tailwind config, or JS strings.
CSS Shape Generator
37 shapes · 7 exportsGenerate pure CSS for 37 shapes — triangles, arrows, stars, hearts, hexagons, speech bubbles and more. Customize color, size, rotation. Export as CSS, HTML, React, Tailwind, SCSS, Styled-Components, or Vue.
CSS Easing Generator
Cubic-bezier curve editorVisual CSS cubic-bezier easing generator. Drag handles to create custom timing functions, preview live animations, copy transition/animation snippets. 27 presets including Back, Expo, Circ easings.
CSS Animation Generator
Keyframe animation builder19 CSS keyframe animations with live preview. Adjust duration, easing, fill mode. Export CSS, Tailwind, or React.
About this tool
Free Online Tools for Web Developers — 56 Browser-Based Utilities
WDP Tools is a collection of 56 free browser-based utilities built for front-end and full-stack developers. From formatting JSON and building Flexbox layouts to generating CSS animations, converting images to Base64, testing regex patterns, and creating QR codes — every tool runs entirely in your browser with no sign-up, no install, and zero data sent to a server. Open any tool and start working immediately.
The toolkit covers six major areas. CSS tools include the Flexbox Builder, CSS Grid Builder, Box Shadow Generator, Gradient Generator, CSS Animation Generator, Loader Generator, Transform Generator, Filter Generator, Clamp() Generator, Clip-path Generator, Glassmorphism Generator, Mesh Gradient Generator, CSS Minifier/Beautifier, CSS to Tailwind Converter, and Tailwind to CSS Converter — 15 CSS tools in total. Code & text tools cover JSON Formatter, JSON Table Viewer, HTML Formatter, Tailwind Formatter, Diff Checker, HTML to JSX Converter, REM ↔ PX Converter, Regex Tester, URL Encoder/Decoder, and Base64 Encoder/Decoder. Security & encoding tools include Hash Generator (MD5, SHA-1, SHA-256, SHA-512), JWT Decoder, and Password Generator. Image tools cover Image Compressor, Image to Base64, and Image to SVG. Visual design tools include Color Picker, Color Palette Generator, Font Pairing Tool, and the QR Code Generator. SVG & animation tools include the SVG Animation Generator and the Animated SVG Icons library.
Every tool is built with React 19 and runs 100% client-side. Your code, images, JSON, and passwords never leave your device — the tools use browser APIs like FileReader, Canvas, Clipboard, and SubtleCrypto directly. The dark-themed interface is keyboard-friendly and mobile-responsive. Output can be exported as CSS, Tailwind, SCSS, JSX, SVG, or plain text depending on the tool.
Features
- 56 tools across CSS, JSON, HTML, SVG, images, AI prompting, security, and typography
- 100% browser-based — your code and files never leave your device
- No sign-up, no account, no usage limits, no watermarks
- Live preview on every visual generator — see changes instantly
- Export as CSS, Tailwind, SCSS, JSX, SVG, PNG, or plain text
- Copy-to-clipboard on every output — one click to grab the code
- Dark theme UI — keyboard-friendly, fast, and mobile-responsive
- Structured FAQ + schema markup on every tool page
- Image tools use FileReader and Canvas API — no server uploads
- Security tools use SubtleCrypto — hashing and encoding run locally
Common Use Cases
Frequently Asked Questions
Yes — every tool is completely free with no account, no subscription, and no usage limits. All 56 tools are available to anyone without sign-up. There are no paywalled features, no watermarks on downloads, and no request caps.
No. All processing happens entirely in your browser using JavaScript. Your JSON, CSS, code, images, and text never leave your device. Image tools use the FileReader and Canvas APIs. Hash and encoding tools use the browser's built-in SubtleCrypto API. This makes the tools safe for confidential code, internal APIs, and sensitive data.
The CSS collection covers: Flexbox Builder, CSS Grid Builder, Box Shadow Generator, Gradient Generator, CSS Animation Generator, CSS Loader Generator, CSS Transform Generator, CSS Filter Generator, CSS Clamp() Generator, CSS Clip-path Generator, Glassmorphism Generator, Mesh Gradient Generator, CSS Minifier/Beautifier, CSS to Tailwind Converter, and Tailwind to CSS Converter — 15 CSS tools in total.
Yes — two of them. CSS to Tailwind converts CSS property-value pairs into equivalent Tailwind utility classes, including arbitrary value classes (e.g. rounded-[12px]) for values outside Tailwind's default scale. Tailwind to CSS does the reverse — it expands Tailwind class names into their plain CSS declarations, useful for understanding what Tailwind generates or migrating to plain CSS.
The Image Compressor reduces PNG, JPEG, and WebP file sizes in the browser with quality control. Image to Base64 converts any image to a Data URI, HTML img tag, CSS background-image snippet, SVG URL-encoded string, or raw Base64. Image to SVG traces raster images into scalable vector paths using Potrace. All three tools are 100% client-side — no image is ever uploaded to a server.
The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512 — computed locally using SubtleCrypto. The Base64 Encoder/Decoder handles Standard, Base64URL (used in JWTs), and MIME variants. The JWT Decoder splits and decodes the header and payload of any JWT. The URL Encoder/Decoder handles percent-encoding. The Password Generator produces cryptographically random passwords with configurable length, character sets, and an entropy strength meter.
Every tool has a one-click Copy button. Most visual generators also have a Download button. Several tools support multiple export formats — the Flexbox Builder exports CSS, Tailwind, or SCSS; the SVG Animation Generator exports .svg or .html files; the QR Code Generator exports PNG (up to 2048px) or SVG; the Image Compressor downloads the optimised image file.
No. Open any tool in a modern browser — Chrome, Firefox, Safari, or Edge — and start immediately. No npm install, no browser extension, no app download required.
Yes. The layout is fully responsive and works on phones and tablets. Visual builders like the Flexbox Builder and SVG Animation Generator are best on larger screens due to their side-by-side panels, but all tools are fully functional on mobile.
Yes. The Regex Tester highlights matches inline in your test string in real time, shows capture groups in a table, and supports a Replace tab for previewing substitution output. It supports all JavaScript regex flags (g, i, m, s, u) and includes a presets library with common patterns for email, URL, phone number, and date validation.
Yes. The QR Code Generator supports 7 content types (URL, Text, WiFi, Email, SMS, vCard, Phone), 6 dot styles, independent eye customization, gradient colors, logo embedding, and PNG/SVG download up to 2048px. It's 100% free with no watermark.
Yes. The collection grew from 15 to 56 tools and continues to expand. New tools are added regularly across CSS, JavaScript, SVG, AI prompting, and design utilities. Tool suggestions are welcome via webdevpuneet.com.