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Guides for everyday file tasks, written to be followed step by step.
Security
What is a checksum, and how do you verify a download?
A SHA-256 checksum tells you whether the file you downloaded is the one the publisher listed. Here is how to check it on Windows, macOS and Linux.
12 November 2026
GuidesHow to compress images for your website without visible quality loss
A practical order of operations for smaller images: resize first, pick the right format, then lower the quality.
12 November 2026
GuidesHow to merge PDF files without uploading them anywhere
Combine several PDFs into one document directly in your browser, so private files never leave your device.
12 November 2026