I made a 100% offline dev toolkit in one HTML file - no dependencies, no ads

unpro_gamer_141 — Sat, 08 Aug 2026 10:59:50 +0000

🧰 DevUtils – The toolkit for developers that you never knew you needed

I was getting really tired of having to open a lot of different websites just to format my JSON or generate a UUID or test a regex. So I decided to build a single HTML page* that can do all of these things. And it works completely offline.

✨ What is included in DevUtils

JSON Formatter / Validator / Minifier – DevUtils can instantly clean up your JSON
Base64 Encoder / Decoder – DevUtils can encode text or decode Base64 strings
UUID v4 Generator – DevUtils can generate a UUID with one click and copy it to your clipboard
Unix Timestamp Converter – DevUtils can convert seconds into a date that you can read easily. And it can also do the opposite
Regex Tester – DevUtils can test patterns with flags like g, i and m
Text Diff Checker – DevUtils can compare two texts and show you exactly what has changed
Color Picker – DevUtils can let you pick any color and get the HEX, RGB and HSL values away
QR Code Generator – DevUtils can generate QR codes from any text or URL

🚀 What makes DevUtils different from tools

DevUtils has zero dependencies – DevUtils does not need npm or a CDN or any build tools
DevUtils works completely offline – DevUtils works without the internet and you can use it anywhere
DevUtils loads really fast – DevUtils does not make you wait for frameworks or APIs to load
DevUtils is just one file – the index.html file. You can just drop it anywhere and start using DevUtils

🎯 You can try DevUtils live

👉 https://unprogamer141.github.io/DevUtils/

📦 DevUtils is on GitHub

👉 https://github.com/unprogamer141/DevUtils – if you think DevUtils is useful you can star it

💬 I want to hear your thoughts, on DevUtils

I built DevUtils for my use but I really want to know what other tools you would like to see added to DevUtils. What is missing from DevUtils? What would make you use DevUtils every day?

Please let me know in the comments.. If you like DevUtils please share it with other developers.