Guides

Practical write-ups on the file problems people actually run into — written to be useful whether or not you use our tools.

• How to merge PDFs without uploading them anywhere

  Most free PDF mergers upload your documents to a server. Here are three ways to combine files that don't.

• How to compress an image to 100 KB without it looking terrible

  Application forms with 100 KB limits are everywhere. The trick is resizing before you compress — here's the method.

• Why your PDF rotation doesn't save — and how to fix it permanently

  You rotate the page, save, and it's sideways again for the recipient. Here's what's actually going on.

• How to convert HEIC to JPG on Windows 11

  Windows still doesn't love iPhone photos. Four ways to convert them, and the setting that prevents the problem.

• Are online PDF tools safe?

  What actually happens to a document you drop into a free PDF site — and how to check before you do.

• How to turn photos into a PDF for an application form

  The portal wants a PDF, your documents are phone photos, and there's a 2 MB limit. Here's the whole workflow.