A Collection of Free Online Tools for Developers (No Ads, No Signup)
If you work with text, JSON files, or tiny repetitive tasks every day, you know the drill.
You open ten tabs, jump between formatters, converters, and quick utilities… then forget which site was actually useful.
So I built a small collection of simple, fast tools that run directly in the browser.
No logins.
Just quick utilities.
Below are all the tools, in case you find them helpful.
✅ Main Website
StackDevTools
A growing collection of lightweight online utilities for developers and creators.
👉 https://stackdevtools.com/
✅ JSON Tools
1. JSON Formatter
Format, beautify, and validate JSON instantly.
https://stackdevtools.com/json-formatter/
2. JSON to XML Converter
Convert JSON into clean, structured XML with one click.
https://stackdevtools.com/json-to-xml-converter/
3. JSON to YAML Converter
Turn JSON into readable YAML in one step.
https://stackdevtools.com/json-to-yaml-converter/
✅ Text & Writing Tools
4. Slug Generator
Create lowercase, hyphen-based, SEO-friendly slugs for URLs.
https://stackdevtools.com/slug-generator/
5. Case Converter
Convert text into uppercase, lowercase, sentence case, title case, and more.
https://stackdevtools.com/case-converter/
6. Text Repeater
Repeat any text, emoji, or phrase instantly.
https://stackdevtools.com/text-repeater/
7. Text Diff Checker
Compare two text blocks or code snippets to highlight differences.
https://stackdevtools.com/text-diff-checker/
✅ Utility Tool
8. Age Difference Calculator
Calculate the exact difference between two dates with precision.
https://stackdevtools.com/age-difference-calculator/
I’ll keep adding more tools over time.
If you have suggestions or ideas, feel free to share!
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