Free Online Tools for Developers
Fast, simple and privacy-friendly tools for coding, websites, SEO, text and more.
// Paste your JSON
"name": "DevTidy",
"version": "1.0.0",
"tools": [
"JSON Formatter",
"JWT Decoder",
"Hash Generator"
],
"privacy": "100% local"
Valid JSON
Formatted successfully
SHA-256
Hash generated
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Developer Tools
Format, encode, decode, validate and test common developer data formats.
Website Tools
Tools for SEO, metadata, sitemaps, robots.txt and website checks.
Text Tools
Clean, compare, count and convert text online.
AI Tools
AI-powered prompt tools for security, formatting and style rewriting.
Image Tools
Compress, convert, resize, crop images and generate icons entirely in your browser.
Security Tools
Generate passwords, minify SVGs and keep your data safe.
Life Tools
Calculators and utilities for everyday tasks — finance, health, travel and more.
Mini Games
Fun browser-based games to test your speed, memory and math skills.
Device Test
Test your keyboard, microphone and webcam right in the browser.
Featured Tools
Most popular tools used by developers
JSON Formatter
Format, validate and beautify JSON online.
Base64 Encoder / Decoder
Encode or decode Base64 strings quickly.
Timestamp Converter
Convert Unix timestamps to dates and vice versa.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT).
Regex Tester
Test and debug regular expressions with live matching.
Robots.txt Generator
Generate robots.txt files for your website.
Sitemap Validator
Validate XML sitemaps and check for errors.
Open Graph Preview
Preview how your links appear on social media.
Markdown Editor
Write and preview Markdown with a live side-by-side editor.
Word Counter
Count words, characters, sentences and paragraphs in your text.
A focused developer toolkit — private, free, and no sign-up
DevTidy is a collection of free online developer tools that run entirely in your browser. It is built for developers, website owners, and SEO beginners who need quick, reliable utilities for everyday work — formatting and validating JSON, decoding JWTs, generating UUIDs and hashes, testing regular expressions, inspecting meta tags, and dozens of other tasks across developer, website, text, image, and security categories.
Almost every tool is private by default: your input is processed locally and never uploaded to a server. The few tools that must contact a server — such as meta-tag or DNS lookups — clearly disclose which URLs are fetched and why. There is nothing to install, no account to create, and no usage limit.
New utilities and guides are added regularly. For the how and why behind each tool — the standards they implement, the common mistakes, and the edge cases — read the DevTidy blog.
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All tools are free, no sign-up required. Start using them right in your browser.
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