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Guides

Short explainers for the rules behind the tools, each with official sources and a check date. Informational only.

Schengen 90/180 rule explainedHow the rolling window works, with an example and official sources.The 183-day rule (US) explainedThe weighted three-year count, which days do not count, worked example.Visa photo size vs file sizeWhat the Visa Code sets, what each portal sets, and how to fit both.mm to pixels for photosThe formula, a table for 35×45 mm and 2×2 in, and why DPI is just a label online.