Free Developer Tools

Format, beautify, minify, and validate JSON in your browser

Generate QR codes for URLs, text, Wi-Fi, and more. Download as PNG.

Generate strong, random passwords with custom length and character sets.

Encode text to Base64 or decode Base64 back to plain text. Supports Unicode.

Encode or decode URLs and query strings with percent-encoding.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly.

Pick any color and instantly get HEX, RGB, and HSL values.

Test regular expressions with live match highlighting and capture groups.

Convert text to camelCase, PascalCase, snake_case, kebab-case, and more.

Convert Unix timestamps to dates and vice versa. Supports seconds and milliseconds.

Generate custom Lorem Ipsum placeholder text — choose number of paragraphs, sentences, or words. Pure client-side.

Convert numbers between binary, octal, decimal, and hexadecimal instantly.

Decode JWT tokens and inspect header, payload, and expiry. Runs in-browser.

Generate cryptographically secure UUID v4 values. Bulk generate up to 50 at once.

Build linear and radial CSS gradients visually and copy ready-to-use CSS.

Convert JSON arrays to CSV with RFC 4180 quoting. Download or copy instantly.

Compare two texts line by line and see exactly what changed. LCS-based diff.

Convert length, weight, temperature, area, volume, speed, and data units.

Generate secure random numbers in any range. Bulk generate up to 1000 at once.

Convert time between IST, UTC, EST, PST, Dubai, Singapore, Tokyo and more.

Parse cron expressions into plain English and preview the next 5 execution times.

Build and validate cron expressions visually — minute, hour, day, month, weekday fields with human-readable preview. No signup required.

Convert any image to Base64 or Data URI instantly in your browser. 100% private.

Calculate, simplify, and scale aspect ratios for video, photo, and design.

Convert any title or text into a clean, SEO-friendly URL slug.

Convert numbers to words in Indian (Lakh/Crore) or International format. Cheque-ready output.

Check password strength with real-time score, crack time estimate, and improvement tips.

Translate text to Morse code or decode Morse back to text. Includes full reference chart.

Convert CSS font sizes between px, rem, em, pt, vw, vh, and % with custom viewport settings.

Convert CSV data to JSON array instantly. Supports all delimiters and quoted fields.

Check WCAG AA and AAA colour contrast ratios for web accessibility compliance.

Convert text to binary, hex, or octal — and decode back to text.

Encode HTML special characters to entities or decode HTML entities to plain text.

Free online scientific calculator with trigonometry, logarithms, powers, factorials, and constants π and e.

Generate 10 lightness shades and 10 harmonic colours (complementary, triadic, analogous) from any hex colour.

Calculate Unix/Linux file permissions visually. Get octal value and ready-to-run chmod command for any permission set.

Convert colour codes between HEX, RGB, RGBA, HSL, HSLA, and HSV instantly with live sliders. Click to copy any format.

Convert numbers to Roman numerals or decode Roman numerals to numbers. Supports 1–3999 with full reference chart.

Calculate exact days, weeks, months, years, and working days between any two dates. Shows countdown for future dates.

Generate random colour palettes in random, pastel, vivid, dark, or monochrome styles. Lock colours and copy hex codes.

Convert JSON objects to TypeScript interfaces instantly. Supports nested objects, arrays, union types, and custom root names.

Validate email addresses with a 9-point checklist, quality score, and disposable domain detection. Bulk validation supported.

Free online stopwatch with lap timer. Records fastest and slowest laps with centisecond precision. Works in-browser.

Calculate IPv4 subnet details from CIDR notation — network address, broadcast, usable hosts, subnet mask, wildcard mask, and IP class.

Convert text to Unicode code points and back. Inspect UTF-8/UTF-16 bytes and generate JS, CSS, HTML, and Python escape sequences.

Format numbers for any locale — Indian lakh/crore, US, European, Arabic. Supports currency, percent, scientific, and compact notation.

Format, beautify, and minify HTML instantly in your browser. Indent HTML with 2 or 4 spaces with tag stats. 100% client-side.

Generate CSS box-shadow visually with live preview. Control X/Y offset, blur, spread, color, opacity, and inset. Supports multiple layers.

Format, beautify, minify, and validate XML in your browser. Supports RSS, SOAP, SVG, config files. 100% client-side.

Visualise JSON as an interactive collapsible tree. Colour-coded data types, expandable nodes for nested objects and arrays.

Experiment with Flexbox properties visually — flex-direction, justify-content, align-items, flex-wrap, align-content, and gap. Copy the generated CSS.

Build CSS Grid layouts visually with live preview. Set columns, rows, gap, and alignment. Copy the generated grid CSS instantly.

Format, beautify, and minify SQL queries online. Keyword capitalisation, consistent indentation, and one-click copy. 100% client-side.

Convert SVG to PNG online. Paste SVG code or upload a file, choose scale (1×–4×) and background, and download a high-resolution PNG.

Generate favicons in all sizes (16 to 512px) from text or an uploaded image. Download PNGs and copy the HTML link tag snippet.

Convert between JSON, YAML, and TOML data formats instantly in your browser. Swap input and output formats with one click. 100% client-side.

Generate barcodes online — CODE128, EAN-13, EAN-8, UPC, CODE39, ITF-14, and more. Customise colors, size, and download as SVG.

Quick reference for regular expressions: anchors, character classes, quantifiers, groups, lookarounds, flags, and ready-to-use patterns.

Complete markdown reference: headings, emphasis, lists, links, code blocks, tables, and GFM extensions like task lists and strikethrough.

Quick reference for Unix file permissions: octal notation (777, 755, 644), symbolic notation (rwx), special bits, and recursive command patterns.

Complete Flexbox reference: container properties, item properties, common patterns (centering, navbar, equal columns), and gotchas.

JSON syntax reference: data types, escape characters, JSON5 differences, common pitfalls (trailing commas, comments, NaN), and date conventions.

Complete CSS Grid reference: container properties, item placement, grid-template-areas, fr/minmax/auto-fit, and Grid vs Flexbox decision guide.

Comprehensive SQL reference: SELECT, JOINs, GROUP BY, window functions, CTEs, INSERT/UPDATE/DELETE, indexes, and PostgreSQL/MySQL/SQLite differences.

Practical Git command reference: branch, commit, rebase, merge, stash, cherry-pick, undo recipes, and the 10 commands that solve 95% of problems.

JSONLint vs Stax JSON Formatter — feature comparison, privacy comparison, and when to pick which. Free, browser-only.

regex101 vs Stax Regex Tester — feature comparison, flavor support, and integrated cheat sheet. Browser-based.

jwt.io vs Stax JWT Decoder — both client-side decoders, integrated with Base64 / hash / regex tools.

Complete JavaScript reference: variables, arrays, objects, functions, promises, async/await, ES2024 features, DOM, error handling. Bookmark-ready quick reference.