Guides that help you get the job done
Clear, practical articles about the things our tools are used for: making files and photos fit upload limits, working out GST and EMI, writing amounts in words and understanding gold prices. Each guide explains the method, shows real examples and points to the right tool.
OCR & DocumentsHow to Convert an Image to Excel Accurately: 10 Tips and a Review ChecklistGet cleaner results when converting a photo or screenshot of a table to Excel: how to take the picture, what OCR gets wrong, and how to review and fix the data before you download.29 October 2026QR & BusinessQR Codes for Small Businesses: UPI, WhatsApp and Wi-Fi Setup and Safety TipsHow shops and freelancers can use QR codes for UPI payments, WhatsApp chats and guest Wi-Fi, what static codes can and cannot do, and how to stay safe from QR scams.29 October 2026Stocks & SavingsStock Average Price Explained: How Averaging Down and Up Changes Your CostLearn how the weighted average buy price of a share is calculated, what averaging down and averaging up really do, and how to track several buys correctly, with rupee examples.29 October 2026Money & DocumentsHow to Write Numbers and Rupee Amounts in Tamil Words (with Examples)A guide to writing numbers and rupee amounts in Tamil words: thousand, lakh and crore terms, how the joining forms change, worked examples and tips for checking the result.29 October 2026GST & Business7 Common GST Invoice Mistakes and How to Avoid ThemAvoid the most common errors on GST invoices: wrong rate, CGST/SGST vs IGST mix-ups, round-off and amount-in-words mismatches, invalid GSTIN, numbering gaps and more, with simple checks.29 October 2026Image TipsJPG vs PNG vs WebP: Which Image Format Should You Use?Understand the difference between JPG, PNG and WebP, when to pick each one for photos, logos, screenshots and website images, and how to convert between them without losing what matters.29 October 2026PDF TipsHow to Merge, Split, Reorder and Rotate PDF Pages (Phone and Computer)A practical walkthrough for combining PDFs, pulling out pages, reordering and rotating them, adding page numbers and compressing the result, all in your browser.29 October 2026QR & BusinessBarcode vs QR Code: Which One Should You Use for Labels, Links and Payments?Compare barcodes and QR codes: what each can store, which barcode format fits which job (Code 128, EAN-13, UPC, Code 39, ITF-14), and tips for printing and scanning both.29 October 2026Loans & FinanceHow EMI Is Calculated: Formula, Worked Example and 5 Ways to Reduce ItUnderstand how a loan EMI is calculated, how each instalment splits into interest and principal, and how tenure, rate and prepayment change the total cost, with worked rupee examples.28 October 2026GST & BusinessGST After 22 September 2025: New Slabs and How to Calculate GST on a BillA plain-language guide to India’s revised GST slabs (5%, 18%, 40% and 0%), how to add or remove GST from a price, how CGST, SGST and IGST differ, and what to check on your invoices.28 October 2026Money & DocumentsHow to Write the Amount in Words on a Cheque (Lakh and Crore Examples)Learn how to write rupee amounts in words on a cheque or invoice in India, with lakh and crore examples, paise formats, common mistakes and the rule when words and figures differ.28 October 2026PDF TipsHow to Reduce PDF Size for Online Forms and Email (Step by Step)A practical guide to making a PDF small enough for online applications and email: remove pages, choose the right compression level, avoid blurry text and check the result before uploading.28 October 2026Image TipsHow to Compress a Photo or Signature to 20 KB, 50 KB or 100 KB for Online FormsStep-by-step guidance for meeting photo and signature size limits on online applications: crop, resize to the required pixels, compress to a target KB and check the result.28 October 2026Gold & SavingsHow to Calculate Gold Jewellery Price in India: Making Charges, GST and HallmarkLearn how a gold jewellery bill is built in India: gold value, making charges, GST and hallmark checks, with a worked rupee example and a way to compare two jewellers fairly.28 October 2026Loans & FinanceSIP vs FD vs RD: How They Differ and How to Estimate ReturnsCompare SIP, fixed deposit and recurring deposit: how each works, how maturity values are estimated, worked rupee examples, and what the estimates leave out.28 October 2026
How we write these guides
Each article is built around a real task. Examples use numbers that can be reproduced with the matching PraxTools tool, and we explain limitations and what the tool does not do. Rates, rules and taxes can change, so finance and tax articles are general information and not professional advice. If you find an error, please tell us.