I needed to generate an invoice last week. Googled "free invoice generator." Every result wanted me to sign up, hand over my email, or start a "free trial" that auto-charges after 7 days.
So I built my own. Then I kept going.
The Problem
Most "free" online tools aren't actually free. They're lead-gen funnels disguised as utilities. You paste your data into some form, and it gets sent to a server you don't control. Maybe it's fine. Maybe your client's billing address is now in a marketing database.
I wanted tools that are actually free:
- No signup
- No servers
- No data collection
- No "upgrade to export"
Everything runs in your browser. Your data never leaves your device.
The Tools
1. Invoice Generator
Who needs it: Freelancers, consultants, small agencies
Create professional invoices with line items, tax calculations, and discounts. Preview in real-time, then print to PDF. I use it for my own consulting work.
The key thing: your client information stays on your machine. No invoice data is sent anywhere.
2. Privacy Policy Generator
Who needs it: Anyone launching a website, app, or SaaS
Answer a few questions about your platform (what data you collect, which third-party services you use, whether you need GDPR/CCPA compliance), and get a ready-to-use privacy policy.
I built this because privacy policy generators are somehow one of the most aggressive data collectors on the internet. The irony.
3. JSON Formatter & Validator
Who needs it: Developers, anyone working with API data
Paste messy JSON, get it beautifully formatted with syntax highlighting. Also validates, minifies, and converts JSON to CSV.
4. QR Code Generator
Who needs it: Event organizers, restaurants, marketers, anyone
Generate QR codes for URLs, emails, phone numbers, WiFi credentials, and SMS. Choose size and error correction level. Download as PNG.
No watermarks, no limits, no "sign up to download in high resolution."
5. Color Palette Generator
Who needs it: Designers, developers building UIs
Pick a base color, choose a color theory scheme (analogous, complementary, triadic, etc.), and get a harmonious palette. Copy hex codes or export as CSS variables.
Bonus: There's also a Markdown Preview tool with live side-by-side editing if you write in Markdown.
Why Privacy Matters for Simple Tools
Here's what bothers me: a JSON formatter doesn't need a backend. A QR code generator doesn't need your email. An invoice tool doesn't need to store your client's address on someone else's server.
Yet most online tools do exactly this — because the business model isn't the tool, it's your data.
These tools are built with static HTML, Tailwind CSS, and vanilla JavaScript. No frameworks, no build steps, no servers. Hosted on GitHub Pages for free. The source code is open: github.com/Docat0209/free-tools.
What's Next
I'll keep adding tools based on what people actually need. If there's a utility you wish existed without the signup wall, let me know in the comments.
I also build developer tools: mcp-openapi turns any REST API into AI-callable tools, and graphql-to-mcp does the same for GraphQL. Both are open source.
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