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.
Freelance Invoice Generator
Create & download PDF invoicesCreate professional freelance invoices instantly. Add logo, client details, unlimited line items, tax, and discount. Live preview updates as you type. Download as PDF or print. Free, no sign-up.
EMI Calculator
Home · Car · Personal · EducationCalculate loan EMI instantly — home loan, car loan, personal loan, education loan. Monthly EMI, total interest, amortization schedule, donut breakdown chart. 100% private, no upload.
Mortgage Calculator
US PITI, PMI & amortizationEstimate US monthly mortgage payments with principal, interest, property tax, homeowners insurance, PMI, HOA dues, payoff date, and downloadable amortization schedule.
Monthly Investment Calculator
Recurring investment growth — any frequencyCalculate how daily, weekly, or monthly investments grow over time. Multi-currency (USD/EUR/GBP/CAD/AUD/INR), compare two contribution amounts side by side, milestone markers, Rule of 72, and CSV export.
Compound Interest Calculator
US investment & savings growthCalculate how investments grow with compound interest. Enter initial amount, monthly contributions, interest rate, and duration to see future value, total invested, interest earned, and inflation-adjusted value.
Retirement Calculator
Savings goal & nest egg plannerEstimate retirement savings, required nest egg, monthly contribution needed, inflation-adjusted value, and withdrawal-rate income. Supports multiple currencies.
SIP Calculator
Mutual fund investment plannerCalculate mutual fund SIP maturity value for India. Add monthly SIP, expected return, duration, annual step-up, lump sum, and inflation to estimate invested amount, gains, and future value.
Budget Planner
50/30/20 rule calculatorPlan a monthly budget from net pay using the 50/30/20 rule. Split take-home income into needs, wants, savings, debt payoff, and goal timelines.
Net Worth Calculator
Assets vs liabilities trackerCalculate net worth from assets minus liabilities. Track cash, investments, property, loans, credit cards, debt ratios, and monthly CSV snapshots in multiple currencies.
Salary to Hourly
Any pay period · Work schedule · All currenciesConvert any salary to an hourly rate instantly. Supports 8 pay periods (hourly, daily, weekly, bi-weekly, semi-monthly, monthly, quarterly, annual). Adjust hours/day, days/week, and weeks/year. Auto-detects currency.
Tip Calculator
Split bill · Custom tip · Per personCalculate how much to tip at a restaurant, split a bill between friends, and find the per-person total. Supports 10–25% presets, custom tip %, and round-up options.
Loan Payoff Calculator
Personal · Auto · Student · Extra paymentsCalculate how long to pay off any loan and how much interest you'll pay. Supports personal, auto, and student loans. Add extra payments to see how much interest you save. Full amortization schedule included.
Inflation Calculator
US CPI · UK RPI · 1913–2024Find out what £1,000 in 1990 is worth today. Uses real US CPI data (1913–2024) from BLS and UK RPI data (1948–2024) from ONS. Shows total inflation %, average annual rate, purchasing power, and a year-by-year chart.
Credit Card Payoff
Payoff timeline · Interest saved · vs minimumSee exactly how long it takes to pay off your credit card debt and how much interest you'll pay. Enter balance, APR, and monthly payment or target months. Compare against minimum-only payments.
VAT Calculator UK
Add / Remove VAT · 20% / 5% / 0% · FreelancersAdd or remove UK VAT at 20% (standard), 5% (reduced), 0% (zero), or custom rate. Shows net, VAT amount, and gross instantly. Includes quick-reference table and VAT registration threshold info.
Australia Take-Home Pay
2024-25 · Income Tax + Medicare · HECS + SuperCalculate your Australian take-home pay for 2024-25. Covers income tax (Stage 3 cuts), Medicare levy, Medicare Levy Surcharge, HECS/HELP repayment, and employer superannuation. Salary or hourly input. Weekly, fortnightly, or monthly output.
Date Calculator
Days between dates · Age calculator · Add/subtract daysCalculate the number of days between two dates, your exact age in years/months/days/hours, or add and subtract days from a date. Includes quick presets and day-of-week results.
Number Base Converter
Binary · Octal · Decimal · HexConvert numbers between binary, octal, decimal, and hexadecimal instantly. Shows 8-bit and 16-bit binary representations. Includes a reference table of common values from 0 to 65535.
About this tool
Free Online Tools for Web Developers — 106 Browser-Based Utilities
WDP Tools is a collection of 106 free browser-based utilities built for front-end and full-stack developers. From estimating Canadian take-home pay, tracking net worth, planning retirement savings, building a 50/30/20 budget, calculating SIP investments, minifying JavaScript, and formatting JSON to building Flexbox layouts, generating CSS animations, autoprefixing CSS, 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, CSS Autoprefixer, 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 — 16 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 and PDF tools cover Image Compressor, Image to Base64, Image to SVG, PDF Password Protector, PDF Watermark, PDF Page Organizer, PDF Compressor, Images to PDF, PDF to Images, PDF Splitter, and PDF Merger. 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
- 106 tools across CSS, JavaScript, JSON, HTML, SVG, images, finance, net worth, retirement, budgeting, text analysis, 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 106 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, CSS Autoprefixer, 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 — 16 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. PDF Password Protector adds an open password and 256-bit PDF encryption with qpdf-wasm, PDF Watermark adds text and image watermarks, PDF Page Organizer reorders, deletes, and rotates PDF pages, PDF Compressor reduces scanned and image-heavy PDF size, Images to PDF combines JPG, PNG, and WebP files into one PDF, while PDF to Images converts PDF pages to PNG, JPG, or WebP without upload. 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. These image 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 106 tools and continues to expand. New tools are added regularly across CSS, JavaScript, SVG, finance calculators, AI prompting, and design utilities. Tool suggestions are welcome via webdevpuneet.com.