Guides

Short, practical explainers of how the formats and formulas behind these tools actually work. Everything here is written to be read in a few minutes and put to use immediately — no jargon required.

All guides

• How PDF Compression WorksWhy scans shrink dramatically while text-only files barely move — and five ways to get a genuinely smaller PDF.
• JPG vs PNG vs WebP: Which Image Format Should You Use?What each format is built for, how their sizes compare in practice, and what converting really does.
• How EMI Is Calculated: The Formula, Step by StepThe standard loan formula worked through with real numbers — and why early payments are mostly interest.
• How to Shrink a Photo for an Online FormResize first, compress second: getting under a KB limit without wrecking the picture.
• What Is a UUID? Version 4, Explained SimplyHow 122 random bits make collisions practically impossible — and when a UUID is the wrong tool.
• CTC vs In-Hand Salary: Why They DifferWhat CTC bundles in, what payroll takes out, and a worked illustration of the gap between the offer and the bank credit.
• How QR Codes Work: Modules, Sizes, Error CorrectionWhat the squares actually do, what the L/M/Q/H levels really buy you, and why a longer link makes a code harder to scan.
• SIP vs Fixed Deposit: What Really DiffersOne rate is promised, the other assumed — why the two are far harder to compare than the headline numbers suggest.
• VAT vs GST vs Sales Tax: What's the Difference?Three names for taxing what people buy — how the systems differ, where each is used, and the reverse calculation almost everyone gets wrong.
• How to Convert a PDF to Word Without Losing FormattingWhy layout breaks when a fixed-page PDF becomes an editable document, what transfers cleanly and what doesn't, and how to get the best result.
• How to Split, Extract, Delete or Reorder PDF PagesFour related page operations explained — which one you actually need, and why none of them touch the quality of the pages they keep.
• How to Get a PDF Under an Email or Upload Size LimitA practical order of attack for the "file too large" wall — compress, split, drop pages or strip metadata — and how to tell which one your file needs.

Every tool these guides link to runs entirely in your browser — nothing you open is ever uploaded.