I Built 75 Free Browser-Based Developer Tools — No Signup, No Tracking

#webdev #javascript #productivity #tools

The Problem

Every time I need a quick tool — convert JSON to YAML, generate a UUID, check a regex — I end up on a site plastered with ads, demanding signups, or uploading my data to their servers.

The Solution: ToolPile

I built ToolPile — 75 free tools that run entirely in your browser. Zero data collection, zero tracking, zero ads.

Each tool is a single self-contained HTML file with inline CSS and JS. No frameworks, no bundlers, no server-side processing.

What's Included

Developer Tools (30+)

JSON Formatter / Validator / to YAML / to CSV
Regex Tester with live matching and capture groups
JWT Decoder — decode headers + payload, check expiry
Base64 Encoder/Decoder — text and image support
CSS/JS Minifier — instant code compression
SQL Formatter — beautify SQL queries
.gitignore Generator — Node, Python, Java, Go, Rust templates
Robots.txt Generator — visual rule builder
Meta Tags Generator — HTML + Open Graph + Twitter Cards
OG Preview — see how links appear on social platforms
Cron Parser — human-readable cron explanations
chmod Calculator — unix permissions made easy

Calculators & Converters (20+)

Unit Converter — length, weight, temperature, data
Binary / Decimal / Hex / Octal converter
Epoch Converter — Unix timestamps with live ticking clock
Loan Calculator — monthly payments + amortization table
Tip Calculator — split bills between people
BMI Calculator, DPI Calculator, Discount Calculator
Percentage Calculator, Aspect Ratio Calculator

Design & Visual Tools (15+)

CSS Gradient Generator — linear/radial with live preview
Box Shadow Generator — visual CSS box-shadow builder
Color Palette Generator — harmonious color schemes
Color Blindness Simulator — accessibility testing
Favicon Generator — from emoji or text
SVG to PNG — with custom dimensions
Barcode Generator — Code 128 with PNG download
QR Code Generator — instant QR codes

Productivity (10+)

Pomodoro Timer — with browser notifications
Typing Speed Test — WPM + accuracy tracking
Stopwatch — lap recording + keyboard shortcuts
Countdown Timer — multiple simultaneous timers
Meeting Cost Calculator — see how expensive meetings really are

Technical Stack

Each tool is:

Single HTML file — inline CSS + JS
Zero dependencies — no npm, no CDN calls
Mobile responsive — works on any device
Keyboard accessible — proper focus management
SEO optimized — structured data, canonical URLs

The entire site is hosted on GitHub Pages — free, fast, and reliable.

Why I Built This

I'm building tools that respect users. No dark patterns, no data harvesting, no paywalls. Just tools that work.

DEV Community