DevToolsHub is a free, open-source collection of browser-based developer tools built to make everyday development tasks faster and easier. The project was born from a simple frustration: every time a developer needs to format JSON, decode a JWT, or test a regex pattern, they end up searching for a tool, hoping it works, and trusting it with their data. We set out to build a better alternative — one place with all the tools you need, where your data never leaves your browser.
Our mission is to provide high-quality developer utilities that are free, fast, and respect your privacy. We believe essential developer tools should not be hidden behind paywalls, should not require account creation, and should not put your data at risk by uploading it to remote servers.
Our philosophyis privacy-first. Every tool on DevToolsHub runs entirely client-side in your browser. When you paste JSON into the formatter, encode a string with Base64, or decode a JWT token, that data is processed by your browser's JavaScript engine — never sent to a server. There is no backend that receives your input, no logs that capture your data, and no database that stores your content. This means you can safely use our tools with sensitive data like API keys, authentication tokens, or private configuration files.
We are committed to open source. DevToolsHub's code is publicly available on GitHub, and we welcome contributions from the developer community. Whether it is a bug report, a feature request, a new tool idea, or a pull request — community involvement makes the project better for everyone.
Format, beautify and validate JSON online — a free client-side JSON formatter that pretty-prints your data in the browser without uploading it.
Validate JSON syntax and find errors with line numbers — a client-side JSON validator that checks your data in the browser, no upload.
Convert JSON data to CSV format - a client-side JSON to CSV converter that transforms data in your browser, no upload.
Convert CSV data to JSON format — a client-side CSV to JSON converter that transforms files in your browser, no upload required.
Decode JWT tokens and inspect header, payload, and signature — a secure, client-side JWT decoder that runs offline in your browser, no token uploaded.
Generate JWT tokens with custom header and payload — a client-side JWT generator that signs tokens in your browser, no data uploaded.
Generate strong, secure passwords with customizable options — a client-side password generator that creates passwords in your browser, never transmitted.
Generate MD5, SHA1, SHA256, SHA512 hashes from text — a client-side hash generator that computes checksums in your browser without uploading.
Encode text to Base64 and decode Base64 to text — a client-side Base64 encoder that converts in your browser, no upload.
Encode and decode URL strings with percent-encoding — a client-side URL encoder that runs in your browser, no data uploaded.
Test regular expressions with live match highlighting and groups — a client-side regex tester that runs in your browser, no data sent to a server.
Format and beautify SQL queries with syntax highlighting — a client-side SQL formatter that pretty-prints in your browser, no query uploaded.
Preview Markdown in real time with GitHub-flavored styling - a client-side Markdown previewer that renders in your browser.
Generate cron expressions with a visual builder and human-readable preview — a client-side cron generator that runs in your browser.
World time converter - convert time between world timezones like UTC to IST, EST to IST, PST to IST. Free world clock, timezone converter and meeting planner with live times and DST-aware UTC offsets.
Generate UUIDs (v4, v7, v1) in bulk with format options — a client-side UUID generator that creates unique identifiers in your browser.
Convert Unix timestamps to human-readable dates and vice versa - a client-side Unix timestamp converter that runs in your browser.
Validate YAML syntax and convert between YAML and JSON - a client-side YAML validator that checks config in your browser, no upload.
Format and beautify HTML code with proper indentation - a client-side HTML beautifier that formats in your browser, no upload.
Format and validate XML documents with proper indentation - a client-side XML formatter that runs in your browser, no upload.
Convert curl commands to code in Python, JavaScript, Go and more - a client-side curl to code converter that runs in your browser.
Pick colors and convert between HEX, RGB, HSL and CMYK - a client-side color picker that runs in your browser.
Minify JSON by removing whitespace and reduce file size - a client-side JSON minifier that compresses in your browser, no upload.
Encode text to Base32 and decode Base32 to text - a client-side Base32 encoder that converts in your browser, no upload.
Parse URLs into protocol, host, path, query params and hash - a client-side URL parser that runs in your browser.
Generate cryptographically random strings with custom charset and length - a client-side random string generator that runs in your browser.
Convert numbers between binary, octal, decimal, hex and custom bases - a client-side number base converter that runs in your browser.
Convert Markdown text to clean HTML with GitHub-flavored support - a client-side Markdown to HTML converter that runs in your browser.
Generate Lorem Ipsum placeholder text in paragraphs, sentences or words - a client-side Lorem Ipsum generator that runs in your browser.
Minify CSS by removing whitespace, comments and optimizing selectors - a client-side CSS minifier that compresses in your browser, no upload.
Convert JSON data to YAML format - a client-side JSON to YAML converter that transforms config in your browser, no upload.
Convert YAML data to JSON format - a client-side YAML to JSON converter that runs in your browser, no upload.
Encode and decode HTML entities for safe display - a client-side HTML entity encoder that runs in your browser.
Compare two text blocks and highlight differences line by line - a client-side text diff checker that runs in your browser, no upload.
Search and reference HTTP status codes with descriptions and use cases - a client-side HTTP status code lookup that runs in your browser.
Convert text between UPPERCASE, lowercase, camelCase, snake_case, kebab-case and more - a client-side case converter that runs in your browser.
Minify JavaScript by removing whitespace and optimizing syntax - a client-side JS minifier that compresses in your browser, no upload.
Minify HTML by removing whitespace, comments and optional tags - a client-side HTML minifier that compresses in your browser, no upload.
Query JSON data using JSONPath expressions and explore paths - a client-side JSONPath finder that runs in your browser, no upload.
Validate JWT tokens by verifying signatures and checking claims - a secure, client-side JWT validator that runs in your browser, no token uploaded.
Generate bcrypt password hashes with configurable rounds - a client-side bcrypt generator that hashes in your browser, never transmitted.
Compare two JSON objects and highlight the differences - a client-side JSON diff checker that runs in your browser, no upload.
Compress JPG, PNG and WebP images without quality loss — a client-side image compressor that optimizes images in your browser, no upload.
Resize images to any dimension with aspect ratio control - a client-side image resizer that works in your browser, no upload required.
Resize multiple images at once and download all as ZIP — a client-side bulk image resizer that works in your browser, no upload required.
Remove image backgrounds with AI - a client-side background remover that works in your browser, no uploads, no limits.
Extract and download all images from a website URL - a client-side image extractor that runs in your browser.
Remove watermarks, logos, and text overlays from images — a client-side watermark remover with brush and box tools that works in your browser, no upload.
Generate harmonious color palettes using color theory - a client-side color palette generator that runs in your browser.
Convert CSV files to Excel (XLSX) format - a client-side CSV to Excel converter that runs in your browser, no upload required.
Convert KML, KMZ to GeoJSON and GeoJSON to KML - a client-side KML to GeoJSON converter that runs in your browser, no uploads.
Convert Excel files (XLS, XLSX, XLSB, ODS) to CSV - a client-side Excel to CSV converter that runs in your browser, no upload.
Convert Excel files (XLS, XLSX, XLSB, ODS) to JSON - a client-side Excel to JSON converter that runs in your browser, no upload.
Convert Word documents (DOCX) to PDF - a client-side Word to PDF converter that runs in your browser, no upload to server.
Merge multiple PDFs into one or split a PDF into pages - a client-side PDF merger that runs in your browser, no upload.
Check WCAG AA and AAA contrast ratios for accessibility - a client-side contrast checker that runs in your browser.
Convert Markdown to PDF with themes and export - a client-side Markdown to PDF converter that runs in your browser, no upload.
Create CSS gradients with live preview - a client-side CSS gradient generator that runs in your browser.
DevToolsHub is built with modern web technologies for performance, maintainability, and developer experience:
React framework with App Router for fast, SEO-friendly pages
Type-safe development across the entire codebase
Utility-first CSS framework for rapid, consistent styling
Global edge hosting with fast CDN delivery
Clean, consistent open-source icon set
Have a question, suggestion, or want to contribute? We'd love to hear from you.
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