TL;DR: I built 44 free developer tools at karangoyal.cc/tools — Shopify Liquid formatter, theme detector, JSON formatter, regex tester, image optimizer, and more. All free, no sign-up, client-side processing. Here's the full list and what I learned.
I'm a Shopify developer (Top Rated Plus on Upwork, $300K+ earned), and over the past year I've been building free developer tools on my personal site. Not as a business — just to scratch my own itches and help other developers.
Here are the ones getting the most love:
🛍️ Shopify-Specific Developer Tools
Liquid Formatter
Format and beautify Shopify Liquid code online. Handles nested loops, complex conditionals, and mixed HTML/Liquid. I built this because VS Code extensions kept breaking on complex templates.
Liquid Analyzer
AI-powered Liquid code analysis for Shopify. Finds performance issues (nested loops, N+1 queries), security problems (missing escape filters), and scores your code 0-100 with actionable fixes.
Shopify Theme Detector
Enter any Shopify store URL — instantly see which theme they're using, their tech stack, and store details. Great for competitive research.
Shopify App Icon Generator
Generate properly-sized app icons for Shopify App Store submission. Saves 20 minutes of resizing every time you submit an app.
Metafield Migration Checker
Check if your Shopify metafields exceed the new 16KB API limit (April 2026 deadline) + get migration code automatically.
Ask Shopify AI
AI chatbot that answers Shopify development questions with code examples. Powered by Shopify's official documentation.
🔧 General Developer Tools
JSON Formatter & Validator
Pretty-print, minify, and validate JSON online. Handles large files without lag.
Regex Tester
Test regex patterns with real-time highlighting. Shows matches, capture groups, and provides common pattern presets.
Diff Checker
Compare two texts with LCS-based diffing and character-level highlighting. Find exactly what changed.
JWT Decoder
Decode JWT tokens online — see header, payload, and verify expiration instantly.
Cron Expression Generator
Visual cron expression builder with 11 presets. Shows next 5 execution times so you know exactly when your job runs.
UUID Generator
Generate v4 UUIDs in bulk. Copy one or many with a single click.
Base64 Encoder/Decoder
Encode/decode Base64 online. Supports text and file inputs.
CSS Minifier
Minify CSS with instant before/after size comparison.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes from any text.
Password Generator
Customizable secure password generation with length, symbols, and entropy display.
Color Picker & Converter
Visual color picker with HEX, RGB, HSL conversions.
📝 Text & Content Tools
Markdown Preview
Live markdown preview with syntax highlighting for code blocks.
Markdown to PDF
Convert markdown to downloadable PDF with proper formatting.
Word Counter
Real-time word/character count, keyword density analysis, reading and speaking time estimates.
Text Case Converter
13 case conversions: camelCase, snake_case, kebab-case, PascalCase, Title Case, CONSTANT_CASE, and more.
CSV to JSON Converter
Bidirectional CSV/JSON conversion with custom delimiters and formatting options.
🖼️ Image Tools
Image Optimizer
Compress images without visible quality loss. 100% client-side — your images never leave your browser.
Remove Background
AI-powered background removal from any image.
Image to SVG
Trace raster images to scalable SVG vectors.
Crop & Resize
Crop and resize images with preset aspect ratios for social media and web.
Image to PDF
Combine multiple images into a single PDF document.
QR Code Generator
Generate QR codes with custom colors, sizes, and download options.
📤 Utility
Share Files
Upload & share files with password protection, expiry dates, and QR code sharing.
What I Learned Building 44 Free Developer Tools
Tools beat blog posts for traffic. My Liquid Formatter gets steady daily organic visits from Google. Blog posts spike when published and die within a week. Tools compound.
Client-side processing wins trust. "Your data never leaves your browser" is a massive trust signal. Every image and text tool runs entirely in the browser — no server uploads.
Scratch your own itch. Every single tool started because I personally needed it. The Liquid Formatter exists because I was tired of manually indenting 500-line Shopify templates.
Keep it simple. No sign-ups, no paywalls, no tracking. Just open the tool and use it. This is what makes people bookmark and come back.
Niche tools have almost zero competition. There's no web-based Shopify Liquid formatter anywhere. No theme detector that works this well. If you're in a niche, the tool space is wide open.
FAQ
Q: Are all these tools really free?
Yes, 100% free with no sign-up required. No freemium, no hidden limits.
Q: Is my data safe?
Most tools (text, image, code formatters) run entirely client-side in your browser. Your data never hits a server.
Q: What tech stack did you use?
Next.js 14 + Tailwind CSS + TypeScript. Each tool is a standalone page component. The site runs on a single VPS.
Q: Can I request a new tool?
Absolutely — drop a comment below or reach out. The best tools come from real developer pain points.
Q: Why not charge for these?
Traffic and backlinks are more valuable to me right now than $5/month subscriptions. Free tools build trust and bring clients to my Shopify consulting business.
All tools are free, no sign-up required. Built with Next.js + Tailwind CSS.
👉 karangoyal.cc/tools — Browse all 44 tools
I'm a Shopify developer by trade — if you work with Shopify or ecommerce, the Shopify-specific tools might save you real time.
What free tools have you built that you wish existed? Always looking for ideas — drop them in the comments.
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