About OneDevKit

Our Mission

OneDevKit was created with a simple mission: to provide developers with free, fast, and privacy-focused tools for everyday tasks. We believe that essential developer utilities should be accessible to everyone, regardless of budget or technical expertise.

Every tool on OneDevKit runs entirely in your browser. Your data never leaves your device, and we don't track, store, or sell any information you enter into our tools.

Why We Built This

As developers ourselves, we were frustrated with existing online tools that:

  • Required unnecessary signups or subscriptions
  • Sent your data to remote servers
  • Were cluttered with intrusive ads
  • Loaded slowly with excessive JavaScript
  • Didn't work well on mobile devices

We set out to build the toolkit we wished existed: simple, fast, private, and free.

Our Tools

We currently offer the following free developer tools:

  • JSON Formatter & Validator - Format, validate, and beautify JSON data instantly. Supports minification and syntax highlighting.
  • SQL Formatter & Beautifier - Format and beautify SQL queries instantly. Supports MySQL, PostgreSQL, SQL Server, and more. Improve readability and consistency.
  • XML Formatter & Beautifier - Format and beautify XML data instantly. Supports minification, syntax validation, and customizable indentation.
  • Markdown Formatter & Preview - Format and beautify Markdown with live preview. Standardize headings, lists, spacing, and code blocks. Supports GitHub Flavored Markdown.
  • Base64 Encoder & Decoder - Encode text to Base64 or decode Base64 to readable text. Supports file uploads and URL-safe encoding.
  • URL Encoder & Decoder - Encode special characters for URLs or decode URL-encoded strings. Essential for web development and API work.
  • JWT Decoder & Inspector - Decode and inspect JSON Web Tokens (JWT). View header, payload, and verify token structure instantly.
  • HTML Encoder & Decoder - Encode special characters to HTML entities or decode HTML entities to text. Essential for web development and preventing XSS.
  • JavaScript Minifier & Beautifier - Minify JavaScript to reduce file size or beautify minified code for readability. Supports ES6+ syntax.
  • CSS Minifier & Beautifier - Minify CSS to reduce file size or beautify minified stylesheets. Removes comments, whitespace, and optimizes selectors.
  • HTML Minifier - Minify HTML to reduce file size. Removes comments, whitespace, and optional tags while preserving functionality.
  • URL Slug Generator - Convert text to URL-friendly slugs. Generate SEO-friendly URLs from titles, handles special characters and multiple languages.
  • String Escape & Unescape - Escape and unescape strings for JSON, JavaScript, HTML, URL, and CSV. Handle special characters safely.
  • JSON to CSV / CSV to JSON Converter - Convert between JSON and CSV formats instantly. Supports nested objects, auto-detects delimiters, and handles headers.
  • JSON to YAML / YAML to JSON Converter - Convert between JSON and YAML formats instantly. Perfect for config files, API responses, and data transformation.
  • HTML to Markdown / Markdown to HTML Converter - Convert between HTML and Markdown formats instantly. Perfect for documentation, blog migration, and content conversion.
  • Password Generator - Generate secure, random passwords for your accounts. Cryptographically secure with customizable options.
  • UUID Generator - Generate UUIDs v1-v7, Nil, and Max. All versions supported including v7 for databases. Bulk generation and validation.
  • Hash Generator - Generate MD5, SHA-1, SHA-256, SHA-3, SHA-384, SHA-512, BLAKE2b, and BLAKE2s hashes from text. Useful for checksums and data integrity verification.
  • Lorem Ipsum Generator - Generate placeholder text for your designs, mockups, and prototypes in paragraphs, sentences, or words.
  • QR Code Generator - Generate QR codes for URLs, text, and other data. Create scannable codes that work with any smartphone.
  • Cron Expression Generator & Parser - Generate and parse cron expressions visually. Build cron schedules for Linux, Unix, and cron jobs. See next execution times and human-readable descriptions.
  • Word Counter - Count words, characters, sentences, and paragraphs instantly. Get reading time and speaking time estimates.
  • Text Case Converter - Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more.
  • Regex Tester & Debugger - Test and debug regular expressions in real-time. See matches highlighted, capture groups, and detailed explanations.
  • Text Diff Checker - Compare two texts and see the differences highlighted. Find additions, deletions, and modifications instantly.
  • Image Compressor to Specific KB - Compress images to exact file size (20KB, 50KB, 100KB). Perfect for passport photos, job applications, and government forms.
  • Passport Photo Resizer - Create passport and visa photos for any country. Resize to exact dimensions and compress to required file size.
  • Social Media Image Resizer - Resize images for Instagram, LinkedIn, Twitter, Facebook, YouTube, Pinterest, TikTok, Snapchat, Discord, Twitch, Threads, WhatsApp. Batch processing, custom sizes, background fill.
  • Color Picker & Converter - Pick colors and convert between HEX, RGB, HSL, and HSV formats. Generate color palettes and copy values instantly.
  • Unix Timestamp Converter - Convert Unix timestamps to human-readable dates and vice versa. Supports multiple date formats and timezones.
  • Timezone Converter - Convert time between different timezones instantly. Compare times across cities worldwide with automatic DST handling.
  • Date Calculator - Days Between Dates - Calculate days between two dates, add or subtract days, weeks, months, or years. Supports business days (excludes weekends).
  • Time Calculator - Hours Between Times - Calculate hours and minutes between two times, add or subtract hours and minutes. Handles overnight shifts automatically.
  • Week Number & ISO 8601 Formatter - Get ISO week number, day of year, quarter, and convert dates to ISO 8601 format. Parse and format dates in multiple formats.

More tools are coming soon. Have a suggestion? Let us know!

Privacy Commitment

Privacy isn't just a feature for us - it's a core principle. Here's what that means:

  • Client-side processing: All tools run entirely in your browser using JavaScript
  • No data collection: We don't collect, store, or transmit any data you enter
  • Minimal analytics: We only use privacy-respecting analytics for basic traffic stats
  • No third-party trackers: No social media widgets or advertising trackers
  • Open source friendly: You can inspect our code in your browser's developer tools

Read our full Privacy Policy for more details.

Contact Us

We'd love to hear from you! Whether you have feedback, suggestions, or just want to say hello, feel free to get in touch.