TetraKits
QR & barcode tools
Create scannable QR codes for URLs, WiFi, and contacts. Scan codes from images and generate product barcodes.
About TetraKits
Free online tools built for quality, not clutter
TetraKits is a growing library of 44+ browser-based tools — QR codes, PDF utilities, calculators, converters, and developer references. Every tool is free, works without signup, and respects your privacy by processing data locally whenever possible.
- Free Forever
- No Signup
- Privacy First
- Mobile Friendly
Our mission
Most tool websites flood search results with hundreds of thin, duplicate pages — the same calculator copied dozens of times with different URLs. TetraKits takes the opposite approach: one premium tool per job, with clear design, accurate results, helpful guides, and clean URLs like /gpa-calculator instead of buried paths.
Whether you need to merge PDF files, calculate your semester GPA, generate a QR code for WiFi, or look up ASCII character codes, TetraKits gives you a focused experience that loads fast on phone and desktop.
Tools we offer
Every category below links to live tools on TetraKits. Each includes a step-by-step guide on our blog.
PDF tools
Merge, split, compress, and edit PDF files entirely in your browser — no desktop software required.
Calculators
Financial, academic, and health calculators with formulas shown and instant results.
Math tools
Scientific calculator, fractions, statistics, and searchable math symbol reference.
Utility & developer tools
Password generator, unit converter, HTML editor, color picker, world clock, and reference tables.
Business tools
Professional documents and finance helpers for freelancers and small teams.
Why people choose TetraKits
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Truly free
No trials, no credit card, no artificial limits. Use every tool as often as you need.
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Privacy by design
Calculators and converters run locally. PDF and QR tools process files in your browser — not on our servers.
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Works everywhere
Responsive layouts for phone, tablet, and desktop. No app install required.
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Quality over quantity
One great unit converter beats hundreds of thin conversion landing pages. We build tools worth bookmarking.
How TetraKits tools work
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1
Pick a tool
Browse by category on the homepage or search from the menu on any page.
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2
Use it instantly
No account creation — open the page and start. Results update live as you type.
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3
Download or copy
Export PDFs, QR codes, invoices, or copy results. Your data stays on your device.
Frequently asked questions
What is TetraKits?
TetraKits is a free website with 44+ online tools for QR codes, PDF files, calculators, converters, and web utilities. Everything runs in your browser.
Is TetraKits free?
Yes. All tools are free with unlimited use. No subscription or signup is required.
Is my data safe?
We design tools to process data locally in your browser whenever possible. We do not sell personal data. See individual tool pages for specifics.
Do you have mobile apps?
TetraKits is a website optimized for mobile browsers. Add it to your home screen for quick access — no app store download needed.
How can I learn to use a tool?
Every major tool has a guide on the TetraKits blog with examples, formulas, and FAQs.
Ready to get started?
Explore the full tool library, bookmark your favorites, and read in-depth guides on the blog. TetraKits is built for students, freelancers, developers, and small businesses who need reliable tools without the friction.