# tools.datnt.dev , free developer & utility tools

> 100+ free online developer and utility tools by datnt (Nguyễn Thành Đạt). Everything runs 100% in your browser , no tracking, no ads, nothing leaves your device. Each tool has its own page, SEO, and dynamic OG image. Available in English and Vietnamese.

Home: https://tools.datnt.dev · Built by https://datnt.dev · Source: https://github.com/ntd4996/datnt.dev

## Categories

- Developer tools (31): JSON Editor, YAML/JSON, CSV/JSON, Markdown Editor, Markdown Table, GitHub Emoji, JS Beautify, JS Obfuscator, SQL Formatter, XML Formatter, CSS/HTML Minifier, JWT Debugger, JWT Secret Generator, Regex Tester, OG Checker, Curl to Code, MIME Lookup, Base64, URL Encoder, HTML Entities, Bookmarklet Builder, Morse Code, ROT13/Caesar, Binary, NATO Phonetic, Slugify, Text Case, Text Diff, Invisible Ink, Crontab Explainer
- Generators (25): UUID, Password, Coin Flip, Dice, Wheel of Names, Random Number/Team, List Shuffler, Fake Credit Card, Random Quote, Lorem Ipsum, Fake Data, Name Generator, Fancy Text, Zalgo Text, Lorem Picsum, QR Code, VietQR (60+ VN banks), Meta Tag, Campaign URL, Email Signature, Mailto Builder, Gradient, Box Shadow, Color Palette, CSS Clip-Path
- Converters (6): Color, Hash Text, Unix Time, Currency, Number Base, Unit
- Calculators (11): Percentage, Aspect Ratio, Tip, Loan/EMI, Discount, VAT, ROI/CAGR, BMI, Date, Age, Color Contrast
- Editors (5): Image Palette, QR Reader, Screenshot Beautifier, Image Resizer, Image Compressor
- Utilities (23): Pomodoro, Chronometer, Countdown, Date Countdown, Timezone, Sleepytime, Digital/Alarm Clock, Metronome, Word Counter, Typing Speed, Emoji/Kaomoji Picker, Tally Counter, Text to Speech, Scoreboard, Mirror Text, Char Frequency, Dictation, Password Strength, What's My IP, Gmail Dot Trick, Scrollbar Customizer, YouTube Thumbnail

## Notes

- All tools are client-side only (no server processing, no data collection).
- Use the in-page search or the ⌘K command palette to find a tool.
- Each tool lives at https://tools.datnt.dev/<tool-slug>.

## Optional

- [Sitemap](https://tools.datnt.dev/sitemap.xml)
- [Author profile](https://datnt.dev/llms.txt)