Software

Combine multiple PDFs into one file for free using iLovePDF or Smallpdf online, Windows' print trick, Mac Preview, or an offline app like PDFsam.

Use the Data tab's Remove Duplicates tool to delete repeat rows, and see why highlighting them with Conditional Formatting first is the safer move.

Passkeys let you sign in with your fingerprint, face, or PIN instead of a password. Here is what they are and how to turn them on for Google, Microsoft, and Apple.

Two-factor authentication blocks most account takeovers even if your password leaks. Learn how to turn on 2FA for Google, Microsoft, and more.

A practical routine for spotting phishing: check the real sender, read a link before clicking, ignore the padlock, and recover fast if you clicked.

A backup is a copy that survives whatever destroys the original. What the 3-2-1 rule protects against, why sync is not backup, and how to test a restore.

How to switch Word's built-in margin presets, set exact custom margins in inches, and apply the change to a whole document, one section, or just the pages ahead.

Four free ways to turn PDF pages into JPG images: Adobe's online converter, Snipping Tool for one page, web converters, and an offline export, compared.

Compare three free ways to turn a PDF into an editable Word file: Word's own converter, Adobe Acrobat online, and Google Docs, plus fixes for scans.

Step-by-step guide to building a PivotTable in Excel: insert it, drag fields into Rows, Columns, and Values, switch Sum to Count, and refresh after edits.