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.

• 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.

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