Guides

Practical, jargon-free explanations of the things our tools help with — image formats, PDFs, passwords, and more.

WebP vs JPEG vs PNG: Which Image Format Should You Actually Use?
A practical comparison of WebP, JPEG, and PNG covering file size, transparency, quality loss, and browser support, with clear rules for choosing between them.
How to Compress Images Without Obviously Losing Quality
A step-by-step method for shrinking image file sizes while keeping them looking sharp, including how to pick a quality setting and the right dimensions.
Converting PDF to Word: What Actually Works and What Does Not
An honest explanation of why PDF to Word conversion is imperfect, what determines whether it will work on your file, and how to get the best result.
How to Create Strong Passwords That Are Actually Practical
What genuinely makes a password hard to crack, why common advice about symbols and frequent changes is outdated, and a realistic system for managing passwords.
Understanding BMI: What It Measures and What It Misses
A clear explanation of how body mass index is calculated, where the categories came from, and the well-documented situations where BMI gives misleading results.
How to Write a Resume That Actually Gets Read
What recruiters and automated screening systems look for, how to write bullet points that land, and the formatting choices that quietly get resumes rejected.
QR Codes Explained: How They Work and How to Avoid Common Mistakes
How QR codes store data, what error correction actually does, why some codes fail to scan, and practical guidance on size, contrast, and safety.
Common JSON Errors and How to Fix Them
The handful of mistakes behind almost every JSON parsing error, how to read the error messages, and how JSON differs from JavaScript objects.
What SHA-256 Is, and How to Check a File Has Not Been Tampered With
A plain explanation of cryptographic hashing, what a checksum proves and what it does not, and how to verify a download you have just made.
Why Your PDF Is So Large, and How to Make It Smaller
What actually takes up space inside a PDF, which fixes give the biggest reduction, and what to avoid when a document has to stay legible or printable.
How to Merge and Split PDF Files (Without Uploading Them)
A practical guide to combining, splitting and reordering PDFs, including page range syntax and why browser-based tools are safer for confidential documents.
Base64 Explained: What It Is and When You Actually Need It
What Base64 encoding does, why it exists, the common misconception that it provides security, and the situations where it is genuinely the right tool.
How Long Should Your Writing Be? Word Counts That Actually Matter
Practical word count guidance for essays, blog posts, emails, CVs and social media, plus why reading time is often a more useful measure than word count.