I Built 24 Free Developer Tools - No Signup, No Ads, No BS

Source: Dev.to

Hey devs! 👋

I got tired of:

• Tools that require signup just to format JSON
• Sites plastered with ads that make the page unusable
• “Free” tools that limit you to 3 uses per day
• Sending my code/data to random servers

So I built Dev Tools – a collection of 24 essential developer utilities that are:

• ✅ 100 % Free – No premium tiers, no limits
• ✅ No Signup Required – Just use it
• ✅ Privacy‑First – Everything runs in your browser, no data stored
• ✅ Fast & Clean – Minimal UI, maximum utility

What’s Included?

Data Conversion & Formatting

• CSV Converter – CSV → JSON, SQL INSERT, PHP arrays
• YAML/JSON Converter – Bidirectional conversion
• JSON Parser – Format, minify, validate, and even repair broken JSON
• SQL Formatter – Beautify or compress SQL queries

Encoding & Security

• Base64 Encoder – Encode/decode text and files
• Hash Generator – MD5, SHA‑1, SHA‑256, SHA‑512
• URL Encoder – Encode/decode + parse URL components
• JWT Decoder – Inspect JSON Web Tokens
• Password Generator – Secure random passwords

Developer Utilities

• Regex Tester – Live matching with explanation
• Cron Parser – Human‑readable cron explanations
• Timestamp Converter – Unix ↔ Human dates
• UUID Generator – Generate, validate, format UUIDs (v4)
• Diff Checker – Compare texts, highlight differences

Text & Content Tools

• Markdown Preview – Live preview with HTML export
• Code Editor – HTML/CSS/JS with live preview
• Text Case Converter – camelCase, snake_case, UPPER, etc.
• Slug Generator – URL‑friendly slugs
• Lorem Ipsum Generator – Placeholder text
• Sort Lines – Sort, dedupe, reverse, shuffle

Visual Tools

• Color Picker – HEX, RGB, HSL, CMYK conversion
• QR Code Generator – URLs, text, and more
• Base Converter – Binary, octal, decimal, hex
• HTML Entity Encoder – Encode/decode special characters

Why I Built This

As a backend developer with 12+ years of experience, I use these tools daily. I wanted something that:

• Just works – No friction, no distractions
• Respects privacy – Client‑side processing only
• Loads fast – No bloated frameworks
• Stays free – Forever

Tech Stack

• Vanilla HTML/CSS/JS (keeping it simple)
• No external API calls for processing
• Mobile responsive
• Dark‑mode friendly

Open Source

The project is open source on GitHub. Feel free to:

• ⭐ Star if you find it useful
• 🐛 Report bugs or request features
• 🤝 Contribute new tools

What’s Next?

I’m planning to add:

• Image optimization tools
• API request builder
• JSON Schema validator
• Code minifiers (HTML, CSS, JS)

What tools would YOU want to see? Drop a comment below! 👇

🔗 Try it: dev-tools.online