How compression, formats, and resizing actually work — and how to get the specific result you need without guessing.
Step by step, without guessing a quality percentage.
Which format to use, and why it matters.
The real difference between resizing and compressing.
A plain-English explanation of the format.
No app install required.
Lossy vs lossless, and why quality is a search problem.
Clear that PageSpeed Insights warning for free, in minutes.
The exact pixel dimensions platforms require — and a one-click way to hit them.
Passport, visa and exam-form photo rules in one place, with links to each country's page.