About FolioFit
The visual paper size comparison tool that helps you understand dimensions at a glance
What is FolioFit?
FolioFit is a free, web-based tool that makes it easy to compare paper sizes visually. Whether you're a designer, printer, student, or just someone trying to understand the difference between A4 and Letter size, FolioFit provides an intuitive drag-and-drop interface to see exactly how different paper sizes relate to each other.
We support all major paper standards including ISO (A, B, C series), US sizes, Japanese JIS sizes, and common formats like business cards and postcards.
How to Use FolioFit
Drag & Drop
Simply drag any paper size from the left panel and drop it into the comparison area. Add multiple sizes to see how they stack up against each other.
Visual Comparison
Papers are displayed to scale, making it easy to understand relative sizes. Zoom in or out to see details or fit more papers in view.
Share Comparisons
Each comparison gets a unique URL that you can share with others. Perfect for collaborating with colleagues or clients.
Metric & Imperial
Toggle between metric (mm) and imperial (inches) units. We automatically detect your location to set the right default.
Features
Who Uses FolioFit?
Designers & Printers
Quickly visualize how designs will look on different paper sizes. Perfect for planning layouts and understanding international format differences.
Students & Educators
Learn about paper size standards and their relationships. Great for understanding the mathematical ratios behind ISO sizes. Find the perfect sized notebook for your notes or journals.
Office Workers
Understand the difference between Letter and A4 when working with international colleagues. Know exactly what size to print documents.