A collection of everyday tools for developers — engineering calculator, unit conversion, JSON, hashing, regex and more. Fast, accurate and free.
A professional scientific calculator with 30-digit precision, trigonometry, logarithms, powers, factorial, memory and history.
Convert length, weight, temperature, data, time, speed, area and volume between 60+ units instantly.
Convert numbers between binary, octal, decimal and hexadecimal — supports arbitrarily large values.
Calculate percentages, tip amounts, increase/decrease and split bills — five modes in one tool.
Generate cryptographically secure random integers and decimals in any range, in bulk.
Check primality, list divisors and get the prime factorization of any whole number.
Measure the duration between two dates, or add/subtract periods and get the exact result.
Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more.
Count characters, words, sentences, lines and paragraphs with estimated reading time.
Encode and decode Base64 with full UTF-8 (Unicode) support.
Percent-encode or decode URLs and query strings safely.
Write Markdown and see a live rendered preview — supports headings, code, tables, lists and more.
Compare two texts side by side with highlighted additions, deletions and unchanged lines.
Generate placeholder text in paragraphs, sentences or words for design mockups and prototypes.
Generate QR codes from any text or URL with customizable colors and size, and download as PNG.
Convert images to Base64 strings and back — drag & drop upload, preview and download.
Remove duplicate lines from text with ignore-case, trim, sort and preserve-order options.
Turn any text into clean, URL-friendly slugs — supports Persian and Latin, removes diacritics.
Create linear, radial and conic CSS gradients with multiple color stops and live preview.
Generate harmonious color palettes from any base color — complementary, analogous, triadic, tints and shades.
Write SVG code and see a live preview with light, dark and transparent backgrounds.
Generate SVG placeholder images with any size, color and label — copy code, data URI or HTML tag.
Resize images by percentage or exact dimensions and convert between PNG, JPEG and WebP — all in your browser.
Format, minify and validate JSON with clear error messages and line numbers.
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 hashes instantly.
Convert Unix timestamps to human-readable dates and back, in local and UTC time.
Convert between HEX, RGB and HSL with a live color preview and adjustment sliders.
Generate secure random UUID v4 values in bulk, with copy-all.
A curated collection of powerful regular expressions for daily development.
Generate strong, unique passwords with customizable length and character sets.
Decode and inspect JSON Web Tokens — view header, payload, signature and expiry status.
Convert JSON arrays to CSV with nested object flattening, custom delimiters and download.
Test regular expressions with live match highlighting, capture groups and flag toggles.
Convert between px, rem, em, pt, vw and vh with configurable root font size and viewport.
Quick reference for HTTP status codes — searchable list with descriptions in EN and FA.
Parse cron expressions into human-readable descriptions with field breakdown and presets.
Inspect every character — Unicode code points, UTF-16 units, categories and text statistics.
Calculate network addresses, subnet masks, broadcast and usable host ranges for any IPv4 CIDR block.
Convert between .env files and JSON with automatic detection, quoting and nested key flattening.
Format, minify and validate XML with proper indentation and clear error messages.
Test regex patterns with capture groups ($1, $2) and a live replacement preview.
Compare two JSON documents and see every added, removed and changed path at a glance.
Create CSS box shadows with visual controls, multiple layers, presets and CSS output.
Interactive flexbox layout builder with container and item controls, live preview and CSS output.
Visual CSS grid builder with column/row templates, gap, alignment and CSS output.
Generate CSS keyframe animations with presets, easing, duration and live preview.
Explore curated Google Font pairings with live preview, custom overrides and CSS export.
Design CSS border-radius visually — four corners, presets, live preview and CSS output.
Create CSS clip-path shapes visually — circle, ellipse, polygon — with editable points.
Combine CSS filters — blur, brightness, contrast, grayscale, hue, opacity, saturate, sepia — with live preview.
Generate CSS media queries for responsive design — min/max width, dark mode, print and orientation.
Convert HTML to JSX with attribute mapping, style-to-object conversion and SVG support.
Searchable HTML entity reference — characters, Greek, math, arrows, symbols with copy-on-click.
Generate Open Graph and Twitter Card meta tags with live social media preview.
Common device viewport sizes and CSS breakpoints — live detection with Tailwind & Bootstrap.
Interactive frontend performance checklist — track your progress across loading, rendering, images and more.
Check color contrast ratios against WCAG 2.1 AA/AAA with suggestions for passing colors.
Break down any URL into its parts and inspect or edit query parameters instantly.
Design an HTTP request visually and generate ready-to-use cURL, fetch, axios and Python code.
Create a favicon from any emoji or letter, preview every size and copy ready HTML link tags.
Build responsive HTML email templates with live preview and pre-built templates.
Generate React component snippets with hooks, TypeScript/JSX, and multiple variants.
Convert SVG code into React components with proper JSX attribute conversion.
Generate modular typography scales with visual preview and CSS variables.
Convert between YAML and JSON with bidirectional support and error messages.
Generate JSON Schema (draft-07) from sample JSON with automatic type inference.
Convert JSON data to TypeScript interfaces with nested object support.
Convert Markdown to clean HTML with headings, lists, code blocks, and links.
Generate mock API responses with status codes, headers, and body templates.
Encode text into binary or hex and decode it back — byte-oriented, UTF-8 safe.
Interactive code review checklist covering quality, security, performance, testing and a11y.
Searchable reference for common HTTP request and response headers and what they do.
Searchable list of common MIME types and their file extensions for web development.