Guides & how-tos
Short, practical articles that help you get better results from our free online tools. Each guide links to the utilities you can use right away.
Images
How to Compress Images Without Losing Quality
Practical tips for shrinking JPG, PNG and WebP files while keeping photos sharp enough for web, email and social.
Read guideQR & Barcode
How to Create a QR Code Online (Free)
Step-by-step guide to generating QR codes for URLs, text and more — plus tips for printing and scanning reliability.
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PNG vs JPG vs WebP: Which Image Format Should You Use?
A clear comparison of PNG, JPG and WebP for websites, documents and sharing — plus when to convert between them.
Read guidePDF
How to Merge PDF Files Online Free
Combine multiple PDFs into one document privately in your browser — useful for applications, reports and scanned paperwork.
Read guideText
How to Count Words in a Document Online
Meet essay, SEO and social limits with a fast word and character counter — no account required.
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How to Resize Images for the Web
Choose the right pixel dimensions for blogs, heroes and thumbnails, then resize photos without installing software.
Read guideWhatsApp
How to Make a WhatsApp Click-to-Chat Button
Create a wa.me link with country code and optional pre-filled message, then use it on websites, bios and QR codes.
Read guideBusiness
How to Create an Invoice PDF for Freelancers
Build a clean freelance invoice with client details, line items, tax and a downloadable PDF — without accounting software.
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Passport Photo Requirements Overview
General guidance for passport and visa photos — size, background and framing — plus a clear disclaimer to verify official rules.
Read guidePDF
JPG to PDF for Scanned Documents
Turn phone scans and photo pages into a single PDF for applications, email and archiving.
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How to Split a PDF for Applications
Extract only the pages you need from a large PDF packet for job, school or visa uploads.
Read guideCalculators
Percentage vs Markup vs Margin
Clear definitions and examples so you price products correctly and avoid mixing up markup with margin.
Read guideDeveloper
Strong Password Best Practices
Practical habits for creating and storing strong unique passwords — including when to use a generator.
Read guideDeveloper
When to Use Base64
Understand what Base64 is for, when it helps in APIs and data URLs, and when it is the wrong tool.
Read guideDeveloper
How to Format JSON for APIs
Pretty-print, validate and minify JSON so API requests and responses are easier to debug.
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