Developer Tools
78 toolsFree browser-based developer tools. JSON formatter, Base64 encoder, regex tester, cron generator, and more. 100% private — no data sent to any server.
API Key Generator — Secure Random Keys Free
Free, private, serverless API key generator. Create cryptographically secure API keys, tokens, and secrets — 100% client-side, no data leaves your browser.
API Response Mocker — Free Online Mock API Endpoint Creator
Free, private, serverless API response mocker. Define mock endpoints with methods, status codes, and JSON responses — 100% client-side.
Background Pattern Generator — Free Online CSS Pattern Maker
Free, private, serverless online background pattern generator with 16 seamless SVG patterns. Custom colors, live preview, copy CSS/SVG code — 100% client-side.
Base64 Encoder / Decoder
Free, private, serverless Base64 encoder and decoder. Encode and decode Base64 strings instantly. No data leaves your browser.
Binary to Text Converter — Free Binary Hex Octal Tool
Free, private, serverless binary to text converter. Convert text to binary, hexadecimal, octal, and decimal — 100% client-side.
Border Radius Generator — CSS Border Radius Tool
Free, private, serverless CSS border-radius generator. Create custom rounded corners with live preview — copy CSS code instantly. 100% client-side.
Box Shadow Generator
Free, private, serverless CSS box shadow generator with live preview. Adjust horizontal/vertical offset, blur, spread, color, inset, and border radius. Choose from 6 professional presets. One-click copy CSS code. No data leaves your browser — 100% client-side.
CSS Animation Generator — Keyframe Animation Builder
Free, private, serverless CSS animation generator. Create custom keyframe animations with live preview — copy CSS code instantly. 100% client-side.
CSS Flexbox & Grid Playground — Free Visual Layout Builder
Free, private, serverless CSS Flexbox and Grid playground. Visual layout builder with live preview and generated CSS code — 100% client-side.
CSS Gradient Generator
Free, private, serverless CSS gradient generator. Create stunning linear, radial, and conic gradients with unlimited color stops. Live preview, angle control, 6 beautiful presets, and one-click CSS code copy. No data leaves your browser — 100% client-side.
CSS Gradient Generator — Visual Builder
Free, private, serverless CSS gradient generator. Build linear, radial, and conic gradients with a visual editor. 8 curated presets, color stops, live preview — copy CSS code instantly. 100% client-side.
CSS Minifier
Free, private, serverless CSS minifier. Minify and beautify CSS code instantly. No data leaves your browser.
CSV to JSON Converter
Free, private, serverless CSV to JSON converter. Parse CSV files with configurable delimiters (comma, tab, semicolon, pipe), quoted field support, and optional header row. Trim whitespace, copy or download JSON output. RFC 4180 compliant parsing. 100% client-side — no data leaves your browser.
CSV to XML Converter — Free Bulk CSV to XML Tool
Free, private, serverless CSV to XML converter with bulk support. Convert CSV data to well-formed XML with custom tags and auto-delimiter detection — 100% client-side.
Color Contrast Checker (WCAG) — Free Online Tool
Free, private, serverless WCAG color contrast checker. Check AA and AAA compliance for text accessibility — 100% client-side.
Color Format Converter — Batch
Free, private, serverless color format converter with batch support. Convert colors between HEX, RGB, HSL, and CMYK formats. Includes a visual color picker, live swatch preview, batch conversion of multiple colors, and instant format switching. Perfect for designers and developers. No data leaves your browser — 100% client-side.
Color Palette Generator
Free, private, serverless color palette generator. Create harmonious color palettes using 6 methods: random, analogous, complementary, triadic, split complementary, and monochromatic. Click to copy hex codes. Export as CSS variables. No data leaves your browser — 100% client-side.
Color Picker & Converter
Free, private, serverless color picker and converter. Pick and convert colors between HEX, RGB, and HSL. No data leaves your browser.
Color Scheme Generator — Palette Creator
Free, private, serverless color scheme generator. Create harmonious palettes using complementary, analogous, triadic, split-complementary, tetradic & monochromatic harmonies. Export to CSS, SCSS, JSON, PNG — 100% client-side.
Cron Expression Generator — Interactive
Free, private, serverless cron expression generator. Build cron schedules visually with presets, human-readable descriptions, and next 5 run times preview. No data leaves your browser — 100% client-side.
Data Size Converter — Free Bytes KB MB GB TB Calculator
Free, private, serverless data size converter. Convert between bits, bytes, KB, MB, GB, TB, PB with binary (IEC) and decimal (SI) standards — 100% client-side.
Data Transfer Rate Converter — Free Mbps KB/s Gbps Tool
Free, private data transfer rate converter. Convert between Mbps, MB/s, Gbps, KB/s, MiB/s — 100% client-side with transfer time calculator. 100% serverless.
Diff Checker
Free, private, serverless text diff checker. Compare two texts side-by-side with line-by-line diff highlighting. Color-coded additions and deletions, line numbers, ignore whitespace and case options. No data leaves your browser — 100% client-side.
Encryption & Decryption Tool — Multi-Algorithm
Free, private, serverless encryption and decryption tool. Encrypt/decrypt text with AES-GCM 256-bit encryption, Base64, ROT13, and XOR cipher. Password-based key derivation (PBKDF2). No data leaves your browser — 100% client-side using Web Crypto API.
Environment Variable Editor — Free Online .env File Editor
Free, private, serverless .env file editor. Parse, edit, validate, and export environment variables — 100% client-side.
Epoch / Unix Timestamp Converter — Bulk
Free, private, serverless Epoch and Unix timestamp converter with bulk support. Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds, displays UTC, local time, ISO 8601, relative time, and timezone info. Convert multiple timestamps at once with bulk mode. Live clock shows the current Unix timestamp. No data leaves your browser — 100% client-side tool for developers.
Fake Data Generator — Bulk Test Data
Free, private, serverless fake data generator with bulk support. Generate realistic names, emails, phones, addresses, UUIDs & 30+ data types. Export to CSV, JSON, or SQL — 100% client-side.
Favicon Generator
Free, private, serverless favicon generator. Create favicons from image upload or text/emoji. Preview at 16, 32, and 64px sizes. Download all standard sizes (16–512px). Generate HTML meta tags for easy integration. No data leaves your browser — 100% client-side.
Find & Replace — Bulk
Free, private, serverless find and replace tool with bulk support. Search and replace text using plain text or regular expressions. Supports case-sensitive matching, whole-word search, regex patterns, match highlighting, and batch processing of multiple replacements. Perfect for developers, writers, and data analysts. No data leaves your browser — 100% client-side.
Font Pairing Generator — Free Online Typography Tool
Free, private, serverless online font pairing generator with 40+ Google Fonts and 32 curated pairings. Live preview, copy CSS code — 100% client-side.
Git Commit Message Generator — Free Conventional Commits Tool
Free, private, serverless git commit message generator. Create conventional commit messages from descriptions or diffs — 100% client-side.
HTML Formatter & Minifier — Bulk
Free, private, serverless HTML formatter and minifier with bulk support. Beautify messy HTML with custom indentation or minify it for production. Supports 2-space, 4-space, and tab indentation, tag counting, size comparison, and batch processing. Ideal for web developers and designers. No data leaves your browser — 100% client-side.
HTML to Markdown Converter — Smart
Free, private, serverless HTML to Markdown converter. Convert HTML code to clean Markdown syntax. Supports headers, links, images, lists, tables, code blocks. No data leaves your browser — 100% client-side.
Hash Generator
Free, private, serverless hash generator. Generate SHA-256, SHA-1, SHA-384, SHA-512, and MD5 hashes. No data leaves your browser.
ICO Converter — Free Favicon ICO Generator Tool
Free, private ICO converter. Generate multi-size .ico favicon files from PNG/JPG — 100% in your browser. 100% serverless.
Image EXIF Viewer — Free Metadata Reader Tool
Free, private image EXIF viewer. Read camera, GPS, date, and metadata from photos — bulk support, downloadable report. 100% client-side. 100% serverless.
Image to Base64
Free, private, serverless image to Base64 converter. Convert images to Base64 strings instantly. No data leaves your browser.
JSON Formatter
Free, private, serverless JSON formatter. Format, validate, and beautify JSON data. No data leaves your browser.
JSON Schema Validator
Free, private, serverless JSON schema validator. Validate JSON data against JSON Schema Draft-07. Supports type checking, required fields, string/number constraints, enum, const, nested objects, arrays, pattern matching, and format validation (email, URI). Detailed error paths. No data leaves your browser — 100% client-side.
JSON Viewer — Interactive Tree Explorer
Free, private, serverless JSON viewer. Parse and explore JSON data with an interactive tree, search, collapse/expand, format/minify, copy path — 100% client-side, no data sent.
JSON to CSV Converter — Bulk Support
Free, private, serverless JSON to CSV converter with bulk support. Convert single JSON objects, arrays, or paste multiple JSON lines (NDJSON) to CSV instantly. Choose custom delimiters (comma, semicolon, tab, pipe), toggle headers, and flatten nested objects. Download as .csv or copy to clipboard. No data leaves your browser — 100% client-side conversion for developers, analysts, and data teams.
JSON to XML Converter — Free Bulk JSON to XML Tool
Free, private, serverless JSON to XML converter with bulk support. Convert JSON data to well-formed XML with custom tags, indentation, and CDATA — 100% client-side.
JSON to YAML Converter — Free Bulk JSON to YAML Tool
Free, private, serverless JSON to YAML converter with bulk support. Convert JSON files to YAML format with smart quoting, key sorting, and custom indentation — 100% client-side.
JWT Decoder & Inspector
Free, private, serverless JWT decoder and inspector. Decode JSON Web Tokens instantly to view the header, payload claims, and signature. Displays algorithm, expiration status, issued-at timestamps, and known claim descriptions. Checks if the token is expired. No data leaves your browser — 100% client-side JWT analysis for developers.
JavaScript Minifier & Beautifier — Bulk
Free, private, serverless JavaScript minifier and beautifier with bulk support. Minify JS code by removing whitespace, comments, and console.log statements, or beautify minified code for readability. View size reduction stats. Process entire scripts at once. No data leaves your browser — 100% client-side.
Lorem Ipsum Generator
Free, private, serverless Lorem Ipsum generator. Create placeholder text instantly. No data leaves your browser.
Markdown Preview
Free, private, serverless Markdown previewer. Live Markdown preview with syntax highlighting. No data leaves your browser.
Markdown Table Generator — Free Online Visual Table Editor
Free, private, serverless online Markdown table generator with visual editor. Create, align, and copy tables — import CSV, TSV, or paste data. 100% client-side.
Markdown to HTML Converter — Live Preview
Free, private, serverless Markdown to HTML converter with live preview. Supports headings, bold, italic, links, images, code blocks, lists, blockquotes, and tables. No data leaves your browser — 100% client-side.
Meta Tag Generator — SEO
Free, private, serverless meta tag generator for SEO. Generate HTML meta tags including title, description, keywords, Open Graph, Twitter Card, viewport, robots, and canonical URL. Real-time SEO tips and character count validation. Copy ready-to-use HTML snippets. No data leaves your browser — 100% client-side.
Number Base Converter
Free, private, serverless number base converter. Convert between binary, octal, decimal, hexadecimal, and custom bases (2-36) instantly. Supports bulk conversion, shows bit and byte counts. 100% client-side — no data leaves your browser.
Ohm's Law Calculator — Free V/I/R/P Electrical Tool
Free Ohm's Law calculator. Enter any 2 of Voltage, Current, Resistance, Power to calculate the other 2. 100% client-side. 100% serverless.
Open Graph Preview — Social
Free, private, serverless Open Graph preview tool. Preview how your links appear when shared on Facebook, Twitter, and LinkedIn. Enter any URL or fill in OG tags manually to see live Facebook card and Twitter card previews. Generate ready-to-use HTML meta tags. No data leaves your browser — 100% client-side.
PNG to WebP Converter — Free Bulk Image Compression Tool
Free, private PNG/JPG to WebP converter. Bulk compress images with quality control — 100% in your browser, no upload. 100% serverless.
Regex Generator — Build & Test Regular Expressions
Free, private, serverless regex generator. Build, test, and debug regular expressions with live matching — 100% client-side, no data leaves your browser.
Regex Tester
Free, private, serverless regex tester. Test regular expressions with live matching and highlighting. No data leaves your browser.
Remove Duplicate Lines — Text Deduplicator
Free text deduplicator. Remove duplicate lines with case sensitivity, whitespace trimming, and sort options. See removal stats — 100% client-side. 100% serverless.
SQL Formatter & Minifier — Bulk
Free, private, serverless SQL formatter and minifier with bulk support. Beautify messy SQL queries with custom indentation and keyword casing, or minify for production. Supports SELECT, JOIN, WHERE, GROUP BY, and all standard SQL syntax. Process multiple statements at once. No data leaves your browser — 100% client-side.
SVG Editor & Icon Maker — Free Online Vector Drawing Tool
Free, private, serverless SVG editor and icon maker. Draw vector shapes, style them, and export as SVG or PNG — 100% client-side.
SVG Optimizer — Optimize SVG Files Online Free
Free, private, serverless SVG optimizer. Remove comments, metadata, editor data, and minify SVG — 100% client-side.
SVG Wave Generator — Create Custom Wave Shapes
Free, private, serverless SVG wave generator. Create custom wave shapes with adjustable parameters — copy SVG code or download. 100% client-side.
SVG to PNG Converter — Free Bulk SVG Export Tool
Free, private SVG to PNG converter. Bulk convert SVGs with custom scale, background color — 100% in your browser. 100% serverless.
Sitemap XML Generator — SEO
Free, private, serverless sitemap XML generator for SEO. Create valid sitemap.xml files with URLs, change frequency, priority, and last modified date. Download or copy ready-to-use XML. No data leaves your browser — 100% client-side.
Subnet Calculator — Free CIDR/IP Networking Tool
Free subnet calculator. Enter IP and CIDR to get network, broadcast, host range, subnet mask, wildcard, IP class. 100% client-side. 100% serverless.
Text Case Converter — Bulk
Free, private, serverless text case converter with bulk support. Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, dot.case, tOGGLE cASE, and aLtErNaTiNg CaSe. Process multiple lines at once for batch conversion. Ideal for developers, writers, and content creators. No data leaves your browser — 100% client-side.
Text Diff Checker
Free, private, serverless text diff checker. Compare two texts side by side with highlighted additions, deletions, and unchanged lines. Supports ignore whitespace and ignore case options. Color-coded diff output shows exactly what changed. LCS-based algorithm for accurate results. No data leaves your browser — 100% client-side comparison tool.
Text Shadow Generator — CSS Text Shadow Tool
Free, private, serverless CSS text shadow generator. Create and customize text shadow effects with live preview — copy CSS code instantly. 100% client-side.
Text to Hex Converter
Free, private, serverless discount calculator. Calculate sale prices with any discount percentage. Supports multiple currencies (USD, EUR, GBP, JPY, INR, AED, SAR). Bulk discount comparison table to see savings at different percentages. No data leaves your browser — 100% client-side.
Text to Slug Generator — Bulk
Free, private, serverless text to slug generator with bulk support. Convert titles, headings, and text into URL-friendly slugs instantly. Supports batch processing of multiple lines, custom separators (hyphen, underscore, dot), lowercase conversion, and accent removal. Perfect for bloggers, developers, and SEO professionals. No data leaves your browser.
Timestamp Converter
Free, private, serverless Unix timestamp converter. Convert between Unix timestamps and human-readable dates bidirectionally. Live current time display, relative time, bulk conversion, seconds/milliseconds toggle. No data leaves your browser — 100% client-side.
URL Encoder / Decoder
Free, private, serverless URL encoder and decoder. Encode and decode URLs instantly. No data leaves your browser.
UUID Generator — Bulk
Free, private, serverless UUID generator with bulk support. Generate UUID v4 (random), UUID v1-like (time-based), Nano ID, and Short IDs in batches up to 1000. Options for uppercase formatting and removing hyphens. Copy individual or all UUIDs, download as .txt file. Uses cryptographically secure randomness (crypto.getRandomValues). No data leaves your browser — 100% client-side generation for developers.
Unicode Character Lookup
Free, private, serverless Unicode character lookup. Search characters by name, code point (U+XXXX), or paste any character for instant analysis. Browse categories — arrows, math symbols, currency, emoji, box drawing, Greek letters. Click any character to copy. No data leaves your browser — 100% client-side.
XML Formatter & Minifier — Bulk
Free, private, serverless XML formatter and minifier. Beautify or minify XML code with configurable indentation. Tag counting and size comparison stats. No data leaves your browser — 100% client-side.
XML to CSV Converter — Free Online Bulk XML Parser
Free, private, serverless XML to CSV converter with bulk support. Parse XML files, flatten nested elements, and export as CSV — 100% client-side.
XML to JSON Converter
Free, private, serverless XML to JSON converter. Parse XML documents including attributes, nested elements, auto-detect types (numbers, booleans). Options to include/exclude attributes and trim whitespace. No data leaves your browser — 100% client-side.
YAML to JSON Converter — Free Bulk YAML Parser Online
Free, private, serverless YAML to JSON converter with bulk support. Parse YAML files and convert to JSON with configurable formatting — 100% client-side.
robots.txt Generator
Free, private, serverless robots.txt generator. Visual rule builder for web crawlers. Add user agents, disallow/allow paths with a friendly UI. Includes presets for Googlebot, GPTBot, ChatGPT-User, AdsBot, and CCBot. Optional sitemap and host fields. Download or copy the result. No data leaves your browser — 100% client-side.
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