Free Online Developer Tools
The developer toolkit that respects your privacy. 70+ tools that run entirely in your browser — no servers, no signups, no data collection.
Instant & Fast
Every tool runs client-side with zero latency. No loading spinners, no API calls — just instant results.
100% Private
Your data never leaves your device. Zero telemetry, zero cookies, zero third-party scripts.
Always Free
No accounts required. No paywalls. No usage limits. Open to everyone, forever.
Featured Tools
JSON Formatter & Validator
Format, validate and minify JSON data. Beautify with proper indentation.
Regex Tester
Test regular expressions in real-time with match highlighting and group capture.
Password Generator
Generate strong, secure random passwords with customizable length and character types.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
JWT Decoder
Decode JWT tokens instantly. View header, payload, and expiration status.
JSON to TypeScript
Paste JSON and generate TypeScript interfaces or type aliases automatically.
Text Tools
Transform, analyze and compare text
Word & Character Counter
Count words, characters, sentences, paragraphs and estimate reading time instantly.
Text Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case and more.
Lorem Ipsum Generator
Generate placeholder text for your designs. Choose paragraphs, sentences or words.
Text Diff Checker
Compare two texts side by side and highlight the differences between them.
Markdown Preview
Write markdown and see a live rendered HTML preview side by side.
Slug Generator
Convert any text into a clean, URL-friendly slug with customizable options.
Text to Speech
Convert text to speech using Web Speech API. Choose voice, speed, and pitch.
Developer Tools
Format, encode, convert and test code
JSON Formatter & Validator
Format, validate and minify JSON data. Beautify with proper indentation.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
URL Encoder / Decoder
Encode special characters in URLs or decode percent-encoded URL strings.
Regex Tester
Test regular expressions in real-time with match highlighting and group capture.
HTML Entity Encoder
Convert special characters to HTML entities and vice versa. Escape & unescape HTML.
JWT Decoder
Decode JWT tokens instantly. View header, payload, and expiration status.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates with relative time.
JSON to CSV Converter
Convert JSON arrays to CSV and CSV back to JSON. Download the result.
Cron Expression Parser
Parse cron expressions into human-readable schedules with next execution times.
SQL Formatter
Format and beautify SQL queries with proper indentation and keyword casing.
Number Base Converter
Convert numbers between decimal, binary, octal, and hexadecimal bases.
JS Beautifier / Minifier
Beautify or minify JavaScript code with proper indentation.
Image to Base64
Convert images to Base64 data URIs. Drag & drop or upload. Copy as CSS or HTML.
Chmod Calculator
Calculate Unix file permissions. Convert between numeric (755) and symbolic (rwxr-xr-x).
Meta Tag Generator
Generate HTML meta tags for SEO, Open Graph, and Twitter Cards with live preview.
JSON to YAML Converter
Convert between JSON and YAML formats. Supports nested objects and arrays.
Text to Binary
Convert text to binary, octal, hex, or decimal ASCII codes and back.
JSON Schema Generator
Paste JSON and auto-generate a JSON Schema Draft 7 with type inference.
JSON Diff Viewer
Compare two JSON objects and visualize added, removed, and changed values.
Open Graph Preview
Preview how your page looks when shared on Twitter, Facebook, and LinkedIn.
GitHub README Generator
Generate professional README.md files with badges, install instructions, and more.
Regex Explainer
Paste a regex and get a plain-English explanation of what each part does.
Docker Run to Compose
Convert docker run commands to docker-compose.yml format instantly.
Nginx Config Generator
Generate Nginx configs for static sites, reverse proxies, SPAs, and more.
JSON to TypeScript
Paste JSON and generate TypeScript interfaces or type aliases automatically.
Curl to Code
Convert curl commands to JavaScript fetch, axios, Python requests, Go, and PHP.
HTML to JSX
Convert HTML to React JSX. Transforms class, style, events and self-closing tags.
CSV Viewer & Editor
Paste or upload CSV files. View as table, sort, filter, edit and export.
Crontab Visual Builder
Build cron expressions visually with dropdowns, presets and next run times.
JWT Builder
Create and sign JWT tokens with HS256. Edit header, payload and secret key.
HTTP Status Codes
Searchable reference of all HTTP status codes with descriptions and use cases.
Encoding Playground
Chain multiple encode/decode steps: Base64, URL, hex, ROT13, HTML entities.
HTML to BBCode
Convert HTML markup to BBCode for forums. Supports bold, links, images, lists and more.
IP Subnet Calculator
Calculate network, broadcast, host range, wildcard mask and CIDR from any IP.
Markdown Table Generator
Build markdown tables visually with a grid editor. Set alignment and export.
XML Formatter & Validator
Format, minify, and validate XML documents with proper indentation.
TypeScript to JavaScript
Strip TypeScript types, interfaces, and annotations to get clean JavaScript.
CSS Minifier / Beautifier
Minify or beautify CSS code. Remove comments, whitespace, or add indentation.
Code Diff Viewer
Compare two code snippets side by side with line-by-line diff highlighting.
Code to Image
Generate beautiful code screenshots with custom themes and backgrounds. Like Carbon.sh but free.
JSON/CSV to Excel
Convert JSON or CSV data to a real .xlsx Excel file with formatted headers. No signup required.
Excel Viewer
Open and view Excel (.xlsx) files in your browser. Browse sheets, sort columns, and search.
API Request Builder
Build and test HTTP requests (GET, POST, PUT, DELETE) with custom headers and body. View responses instantly.
Env Variables Editor
Edit environment variables visually. Convert between .env, JSON, YAML, and docker-compose formats.
Git Command Builder
Build git commands visually with dropdowns and checkboxes. Merge, rebase, reset, stash and more explained.
SQL to MongoDB Converter
Convert SQL queries to MongoDB equivalents. SELECT, INSERT, UPDATE, DELETE to find, insertOne, updateOne, deleteOne.
SVG to React Component
Convert SVG markup to React JSX/TSX components with TypeScript props, forwardRef and memo.
JSON to Zod Schema
Generate Zod validation schemas from JSON data automatically. Supports nested objects, arrays, and type inference.
React Component Generator
Generate React functional components with TypeScript, hooks, forwardRef, memo and custom props.
Tailwind CSS Playground
Preview Tailwind CSS classes in real-time. See rendered output and generated CSS instantly.
YAML to JSON
Convert YAML to JSON instantly. Supports nested objects, arrays, anchors and multi-line strings.
CSV to JSON
Convert CSV files to JSON arrays. Auto-detects headers, handles quoted fields and type inference.
JSON to SQL
Convert a JSON array to SQL CREATE TABLE and INSERT statements. Supports MySQL, PostgreSQL and SQLite.
GraphQL Formatter
Format and prettify GraphQL queries, mutations, and schema definitions with proper indentation.
URL Parser
Break down any URL into its components: protocol, host, port, path, query params, and hash.
HTTP Headers Inspector
Paste HTTP response headers and get a plain-English explanation of what each header does.
Base64 Image Viewer
Paste a Base64 image string and preview it instantly. Detect format, dimensions and file size.
Binary to Text
Convert binary (0s and 1s) to readable text and text back to binary. Supports ASCII and UTF-8.
Markdown to HTML
Convert Markdown to raw HTML source code. See the generated tags and copy the output.
Generators
Generate passwords, UUIDs, QR codes, images and hashes
Password Generator
Generate strong, secure random passwords with customizable length and character types.
UUID Generator
Generate random UUID v4 identifiers. Create one or bulk generate multiple UUIDs.
QR Code Generator
Generate QR codes from any text or URL. Download as PNG image.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text input.
Placeholder Image Generator
Generate placeholder images with custom size, colors and text. Download as PNG.
Fake Data Generator
Generate fake names, emails, addresses, and more for testing. 100% client-side.
RSA Key Pair Generator
Generate RSA key pairs using Web Crypto API. Keys never leave your browser.
HMAC Generator
Generate HMAC signatures with SHA-256/384/512 using Web Crypto API.
Emoji Picker & Search
Search and copy emojis by name or category. 200+ emojis organized and searchable.
PDF Merge
Combine multiple PDF files into one. Reorder pages and download. No limits, 100% free.
PDF Split
Split PDF files by page ranges. Extract specific pages into a new PDF. Unlimited and free.
PDF Compress
Compress PDF files to reduce size. Remove metadata and optimize. No upload limits.
Favicon Generator
Generate favicons from text, emoji or initials. Download as PNG in all standard sizes (16×16 to 512×512).
Bcrypt Generator
Hash and verify passwords using a bcrypt-compatible algorithm in your browser. Never sends data to a server.
Discord Timestamp
Generate Discord timestamp tags from any date and time. Copy the <t:unix:format> code instantly.
Design Tools
Colors, gradients, shadows, flexbox and more
Color Picker & Converter
Pick colors and convert between HEX, RGB, and HSL formats. Copy CSS values.
CSS Gradient Generator
Create beautiful CSS gradients with a visual editor. Copy the CSS code instantly.
CSS Box Shadow Generator
Create CSS box shadows visually with multiple layers, inset support, and live preview.
CSS Flexbox Generator
Visual flexbox playground. Configure container and item properties with live preview.
CSS Border Radius Generator
Visual border-radius editor with independent corner controls and live preview.
Color Palette Generator
Generate harmonious color palettes. Complementary, analogous, triadic and more.
SVG Preview & Optimizer
Preview SVG code, optimize it and download. Remove comments, metadata and whitespace.
CSS Animation Generator
Build CSS keyframe animations visually with timeline, presets, and live preview.
CSS Grid Generator
Visual CSS Grid layout builder with drag-and-drop areas and live preview.
Glassmorphism Generator
Create trendy glassmorphism CSS effects with blur, transparency, and borders.
Fluid Typography Calculator
Generate CSS clamp() values for responsive fluid font sizes across viewports.
Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions while maintaining proportions.
Tailwind Color Finder
Find the closest Tailwind CSS color to any hex value with visual comparison.
CSS to Tailwind Converter
Convert CSS properties to Tailwind utility classes. Paste CSS, get Tailwind.
Image Compressor
Compress images in your browser using Canvas API. Adjust quality and resize.
Color Contrast Checker
Check WCAG 2.0 color contrast ratios for accessibility compliance (AA/AAA).
CSS Clip-path Generator
Generate CSS clip-path shapes visually. Create polygons, circles, ellipses with live preview.
Color Blindness Simulator
Simulate how your designs look to users with color blindness. Upload an image and preview all types.
CSS Variables Generator
Define design tokens — colors, spacing, typography — and generate a :root CSS variables block.