The Toolinza Blog
Practical guides, tips and how-tos to help you get the most out of our tools and make smarter decisions.
How to Add Page Numbers to a PDF for Free
Add page numbers to any PDF in your browser — choose the position, format and starting number, and keep your document private with no uploads.
Jul 27, 2026 · 6 min read →How Much Water Should You Drink a Day?
Understand how daily water needs are estimated from body weight and activity, the signs of good hydration, and how to set a sensible personal water goal.
Jul 26, 2026 · 6 min read →What Is Your Ideal Weight for Your Height?
Learn how ideal body weight is estimated from height, how the popular formulas work, and how to use the numbers sensibly alongside BMI and body composition.
Jul 25, 2026 · 6 min read →How to Sign a PDF Online for Free (Without Printing)
Sign PDF documents electronically in your browser — draw, type or upload a signature, place it precisely and keep your files private. No printing required.
Jul 24, 2026 · 6 min read →What Is a Unix Timestamp and How to Convert It
Learn what a Unix timestamp is, why developers use it, how time zones fit in and how to convert between epoch time and human-readable dates instantly.
Jul 23, 2026 · 6 min read →HEX, RGB and HSL Color Codes Explained (With Conversions)
Understand HEX, RGB and HSL color codes, how they differ and when to use each — plus how to convert between them instantly for web and design work.
Jul 22, 2026 · 6 min read →eBay Fees Explained: How to Calculate Your Real Profit
Break down eBay insertion fees, final value fees and payment costs so you can price listings correctly and know your true profit before you sell.
Jul 21, 2026 · 7 min read →Etsy Fees Explained: What You Really Pay Per Sale
Understand every Etsy fee — listing, transaction, payment processing and offsite ads — and learn how to price your products so you keep a healthy profit.
Jul 20, 2026 · 7 min read →How to Resize an Image Online Without Losing Quality
Learn how to resize images by pixels or percentage, keep the correct aspect ratio and avoid blurriness — all free and private in your browser.
Jul 19, 2026 · 6 min read →JPG vs PNG vs WebP: Which Image Format Should You Use?
A clear, practical comparison of JPG, PNG and WebP — when to use each format, how they affect quality and file size, and how to convert between them for free.
Jul 18, 2026 · 7 min read →How to Password Protect a PDF (Keep Sensitive Documents Safe)
Add a password to encrypt a PDF and control who can open it — free and private in your browser. When to protect a PDF and how to do it right.
Jul 16, 2026 · 5 min read →How to Calculate Your Exact Age in Years, Months and Days
Work out your precise age — or the time between any two dates — in years, months, days and more, with a free, instant age calculator.
Jul 16, 2026 · 5 min read →Word Counter Guide: Hitting Length Limits for SEO and Study
Why word and character counts matter for essays, SEO, social posts and meta tags — plus how to track them instantly with a free word counter.
Jul 16, 2026 · 5 min read →How to Convert JPG to PDF (Combine Photos into One File)
Turn JPG or PNG images into a single PDF for free in your browser — one image per page, no upload, no watermark. A quick, private how-to.
Jul 16, 2026 · 5 min read →GST Calculator Guide: How to Add and Remove GST Correctly
Understand GST slabs, how to add GST to a price, how to remove GST from a total, and how CGST and SGST split — with a free GST calculator.
Jul 16, 2026 · 6 min read →How to Calculate Percentages Easily (With Examples)
Percentages made simple: how to find a percentage of a number, percentage change and reverse percentages, with worked examples and a free calculator.
Jul 16, 2026 · 6 min read →How to Split a PDF into Separate Files or Pages
Split a large PDF into separate files or extract individual pages for free in your browser — no upload, no watermark. Step-by-step guide.
Jul 16, 2026 · 6 min read →How to Compress a PDF Without Losing Quality
Reduce PDF file size for email and uploads without wrecking the quality. A practical guide to shrinking PDFs free and privately in your browser.
Jul 16, 2026 · 6 min read →How to Convert PowerPoint to PDF for Easy Sharing and Printing
Convert a PowerPoint presentation to a shareable PDF in your browser — free, private, one page per slide. Step-by-step guide and best practices.
Jul 16, 2026 · 6 min read →How to Convert PDF to PowerPoint and Reuse Documents as Slides
Turn each page of a PDF into an editable PowerPoint slide in your browser — free, private, no upload. Perfect for reusing reports and brochures.
Jul 16, 2026 · 6 min read →How to Convert Excel to PDF (So Your Spreadsheet Prints Perfectly)
Turn an Excel spreadsheet or CSV into a clean, printable PDF in your browser — free, private, every sheet included. Step-by-step guide and tips.
Jul 16, 2026 · 6 min read →How to Convert PDF to Excel: Get Your Tables Back into Real Cells
Extract tables from a PDF into an editable Excel spreadsheet or CSV in your browser — free, private, no upload. How it works and how to get clean results.
Jul 16, 2026 · 6 min read →How to Convert Word to PDF (Free, Private and Perfectly Formatted)
Turn a Word document into a clean, shareable PDF in your browser — free, no upload, no watermark. Step-by-step guide plus formatting tips.
Jul 16, 2026 · 6 min read →How to Convert PDF to Word for Free (Without Losing Formatting)
Convert PDF to an editable Word document in seconds — free, private and in your browser. Learn how it works, when it does not, and how to get clean results.
Jul 16, 2026 · 6 min read →Zakat Calculation Made Simple: A Step-by-Step Guide
Learn how to calculate Zakat correctly — what counts as zakatable wealth, the nisab threshold, and the 2.5% rate — with a free calculator.
Jul 16, 2026 · 6 min read →How to Write Product Titles That Rank and Sell
Write SEO product titles that get found and clicked on Amazon, Etsy, Shopify and eBay — structure, keywords, character limits and examples.
Jul 15, 2026 · 6 min read →SIP vs Lumpsum: Which Way to Invest in Mutual Funds?
SIP or lumpsum? Understand the pros and cons of each mutual fund investing method and how to decide which suits your money and goals.
Jul 14, 2026 · 6 min read →How to Calculate Your Loan EMI (and Pay It Off Faster)
Understand how EMI is calculated, what really makes it rise or fall, and how small extra payments can save you a fortune in interest.
Jul 13, 2026 · 6 min read →The Pomodoro Technique: Beat Procrastination in 25-Minute Sprints
A practical guide to the Pomodoro Technique — how it works, why it beats procrastination, and how to run your first focused session for free.
Jul 11, 2026 · 6 min read →Shopify Fees Explained: What You Actually Keep Per Sale
A clear breakdown of Shopify fees — plan costs, payment processing and transaction fees — so you know exactly what you keep on every order.
Jul 10, 2026 · 6 min read →How to Calculate Amazon FBA Profit Before You Buy Inventory
Learn how to work out your real Amazon FBA profit and margin — referral fees, fulfilment fees and hidden costs — before you commit to stock.
Jul 8, 2026 · 7 min read →Barcode Types Explained: EAN-13, UPC, Code 128 and When to Use Each
Confused by barcode formats? A clear guide to EAN-13, UPC-A, Code 128, ITF-14 and more — and how to pick the right one for your products.
Jul 6, 2026 · 6 min read →WiFi QR Codes: Let Guests Connect Without Sharing Your Password
Create a free WiFi QR code so guests connect instantly by scanning — no typing long passwords. Works for homes, cafes, offices and rentals.
Jul 4, 2026 · 6 min read →How to Create a Free QR Code With Your Logo and Brand Colours
A step-by-step guide to designing a branded QR code with your own logo and colours for free — and making sure it still scans reliably.
Jul 2, 2026 · 6 min read →Unit Conversion Made Easy: Metric vs Imperial
A practical guide to converting between metric and imperial units — length, weight, temperature and more — with free instant converters.
Jun 29, 2026 · 6 min read →Daily Calorie Needs: TDEE, BMR and Weight Loss Explained
What are BMR and TDEE, how many calories do you need, and how do you lose or gain weight safely? A clear, science-based guide with a free calculator.
Jun 26, 2026 · 6 min read →Compound Interest Explained: How Your Money Grows
Learn how compound interest works, why starting early matters, and how to project your savings growth with a free calculator.
Jun 23, 2026 · 6 min read →How to Convert PDF to Word, Text and CSV
Extract editable content from PDFs. Learn how to convert PDF to Word, plain text and CSV for free, privately in your browser.
Jun 20, 2026 · 6 min read →The Complete Guide to On-Page SEO Meta Tags
Title tags, meta descriptions, Open Graph and more — everything you need to know about meta tags for SEO, with free generators.
Jun 17, 2026 · 7 min read →Mortgage Basics: How Much House Can You Afford?
A clear guide to working out your home-buying budget, from the 28/36 rule to deposits, interest rates and monthly payments — with a free calculator.
Jun 14, 2026 · 6 min read →How to Compress Images Without Losing Quality
Reduce image file size for faster websites and easy sharing without sacrificing quality. A practical guide plus a free browser-based compressor.
Jun 11, 2026 · 6 min read →How to Calculate Loan Amortization (With a Free Schedule)
Understand how loan amortization works, how each payment splits between principal and interest, and download a free amortization schedule.
Jun 8, 2026 · 6 min read →Understanding Your BMI: A Complete Guide to Body Mass Index
What is BMI, how is it calculated, and what do the categories mean? A clear, standards-based guide to Body Mass Index with a free calculator.
Jun 5, 2026 · 6 min read →How to Merge PDF Files for Free Without Uploading Them
Learn how to merge multiple PDF files into one document for free, right in your browser — no uploads, no watermarks and 100% private.
Jun 2, 2026 · 6 min read →