Niva Tools Guides
Browse clear tutorials that explain how to use online utilities safely and effectively. Each guide connects to a free Niva Tools workflow.
Guide
Learn how to crop, resize and compress JPG, PNG or WebP images locally in the browser for forms, blogs and SEO pages.
Read guideImage Guide
Use the correct 16:9 frame, keep important text and subjects visible, and compress the final thumbnail only when needed.
Read guideImage Guide
Compare file size, transparency, visual quality and compatibility before choosing a format for blogs, websites and online stores.
Read guideImage Guide
Use a repeatable crop, resize, format and compression workflow while keeping important product details clear.
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Learn how to create local QR codes for restaurant menus, guest Wi-Fi, PNG/SVG print materials and scan-safe sharing.
Read guideQR Guide
Choose the right contact fields, export a print-friendly code and test it before ordering business cards.
Read guideQR Guide
Learn how physical size, contrast, quiet space, export format and viewing distance affect scan reliability.
Read guideQR Guide
Use a stable mobile-friendly destination, choose practical placement and test the complete customer workflow.
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Understand when to use JPG, PNG or WebP and how to choose the right output format for websites, forms and everyday sharing.
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Learn how to merge PDF files, split pages, rotate documents and review browser-side PDF results before sharing.
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Learn practical ways to count words, change case, remove duplicate lines, generate slugs and clean copied text for everyday work.
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Learn how freelancers can create a browser-based invoice PDF, review totals and download the file without creating an account.
Read guideInvoice Guide
Learn when a no-account invoice workflow is useful, what information to prepare and what records you still need to keep yourself.
Read guideInvoice Guide
Use a practical checklist for client details, invoice numbers, dates, line items, totals, payment terms and final review.
Read guideInvoice Guide
Export the invoice, inspect the final PDF, choose a useful filename and keep a reliable copy before sending it to a client.
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