TetraKits
TetraKits Blog
In-depth guides for QR codes, PDF workflows, barcodes, and financial planning — with free tools you can use immediately.
QR CodesHow to Create a QR Code for WhatsApp (Free Step-by-Step Guide)
Create a free WhatsApp QR code in seconds. Learn wa.me links, print sizes, business card tips, and download a scannable code with TetraKits — no signup required.
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QR CodesHow to Share a Dropbox Video Link with a QR Code (Free Guide)
Share Dropbox video links at events and on print materials using a free QR code. Step-by-step guide for creators, teachers, and marketers — TetraKits QR generator.
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QR CodesQR Code Marketing Guide 2026: Ideas, Design Tips & Free Tools
Complete QR code marketing guide for retail, restaurants, and events. Campaign ideas, design best practices, and free tools to create scannable codes that convert.
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QR CodesBest Free QR Code Generator in 2026 (Compared & Reviewed)
We compared the best free QR code generators for URLs, WiFi, and vCards. See why TetraKits wins on privacy, resolution, formats, and zero signup — full review inside.
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QR CodesHow to Scan a QR Code Online Free (Camera or Image Upload)
Scan QR codes online from your camera or an uploaded image. Free browser-based QR scanner — decode URLs, WiFi, and contacts privately with TetraKits.
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BarcodesHow to Generate a Barcode for Products (EAN, UPC, CODE128)
Create product barcodes online for free — EAN-13, UPC-A, CODE128, and more. Step-by-step label guide for retail, Amazon, and inventory with TetraKits.
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CalculatorsCompound Interest Calculator Guide: Formula, Examples & Free Tool
Understand compound interest with clear examples and a free calculator. Plan savings and investments with multi-currency support — no signup on TetraKits.
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CalculatorsHow to Calculate Loan Payments (Mortgage & Auto Formula Guide)
Calculate monthly loan payments, total interest, and amortization for mortgages, auto loans, and personal loans. Free loan calculator — instant results.
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CalculatorsPercentage Calculator Guide: Discounts, Tax, Markup & More
Master percentage math for discounts, tax, tips, and markup. Free online percentage calculator with multiple modes — fast, accurate, no signup.
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PDF ToolsHow to Merge PDF Files Online Free (Combine PDFs in Browser)
Merge multiple PDF files into one document online for free. Drag, reorder, and download — private browser-based PDF merger, no signup required.
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PDF ToolsHow to Split PDF Pages Online (Extract & Separate PDFs Free)
Split PDF files and extract pages online for free. Extract ranges, split every N pages, or save each page — private in-browser PDF splitter.
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PDF ToolsHow to Compress PDF Online Without Losing Quality (Free Guide)
Reduce PDF file size online with light, balanced, and maximum compression. Free browser tool that never returns a larger file — step-by-step guide.
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PDF ToolsHow to Edit PDF Text Online Free (Browser PDF Editor Guide)
Edit PDF text online for free. Click to fix typos, add text boxes, drag to reposition, and download — private in-browser PDF editor with mobile support.
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