Practical Guides

Clear instructions and limitations for common tasks. Each guide links to relevant Xotka tools.

How to Calibrate an Online Ruler

Learn how to calibrate an on-screen ruler with a known physical reference and understand why screen measurements need calibration.

Compare image dimensions, file formats, and compression settings to reduce an image's file size while checking visual quality.

Understand word counts, character counts, spaces, and line breaks when preparing text for forms, posts, essays, or documents.