5 Free Privacy-First Tools I Built Because I Was Tired of Signing Up for Everything
Source: Dev.to
I needed to generate an invoice last week. I Googled “free invoice generator,” but every result required 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 a form, and it gets sent to a server you don’t control. Maybe it’s fine, but your client’s billing address could end up 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. Your client information stays on your machine—no 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. Built because most privacy‑policy generators are aggressive data collectors.
3. JSON Formatter & Validator
Who needs it: Developers, anyone working with API data
Paste messy JSON, get it beautifully formatted with syntax highlighting. It also validates, minifies, and can convert JSON to CSV.
4. QR Code Generator
Who needs it: Event organizers, restaurants, marketers, anyone
Generate QR codes for URLs, emails, phone numbers, Wi‑Fi credentials, and SMS. Choose size and error‑correction level. Download as PNG—no watermarks, no limits, no sign‑up required.
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: Markdown Preview
A live side‑by‑side Markdown editor.
Why Privacy Matters for Simple Tools
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 utilities are built with static HTML, Tailwind CSS, and vanilla JavaScript—no frameworks, no build steps, no servers. They’re hosted on GitHub Pages for free, and the source code is open: .
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.