10 Free Developer Tools I Actually Use Every Day (No Signup, No BS)

#productivity #softwaredevelopment #tools #webdev

As developers, we constantly need small utilities — format some JSON, decode a JWT, generate a UUID, compress a screenshot before uploading. Most of us either Google around, install a random VS Code extension, or paste sensitive data into some sketchy ad-filled site.

Over the past few months I've been building Dev Hackes — a collection of 100+ free tools that run entirely in the browser. No signup, no data leaving your machine. Here are the 10 I personally reach for the most:

1. JSON Beautifier & Validator

Debugging an API response? Paste the minified JSON and get it formatted and validated in one click.
→ JSON Beautifier

2. JWT Decoder

Need to quickly check what's inside a token without verifying the signature? Decode the header and payload instantly.
→ JWT Decoder

3. UUID Generator

For database seeds, session tokens, or test fixtures — generate UUIDs in bulk.
→ UUID Generator

4. Image Compressor

Screenshots and assets straight from your design tool are huge. Compress them before committing or uploading — your repo and your users will thank you.
→ Image Compressor

5. Image Converter (PNG/JPG/WebP/AVIF)

Need to convert a PNG to WebP for better Lighthouse scores? Drag, drop, done.
→ Image Converter

6. QR Code Generator

For WiFi sharing pages, app download links, or event check-ins — generate QR codes with custom colors.
→ QR Code Generator

7. SQL Formatter

Inherited a 200-line query written on one line? Format it into something readable.
→ SQL Formatter

8. Markdown to HTML

Writing docs or email templates? Convert markdown to clean HTML instantly.
→ Markdown to HTML

9. Word Counter

Quick sanity check on string lengths before hitting API limits (OpenAI, SMS gateways, tweet length).
→ Word Counter

10. JSON Minifier

Going the other way — strip whitespace from JSON before storing it in a config or env variable.
→ JSON Minifier

Why browser-only matters: every tool above runs 100% client-side with JavaScript. Your API keys, tokens, and data never touch a server. That's the whole point — utilities should be fast and private by default.

All 100+ tools are free at devhackes.tech. If there's a tool you wish existed, drop it in the comments — I'm actively adding new ones every week.