Guides

Last updated 24 September 2026

Short, practical answers to the problems people bring to a converter. Each one explains the cause first, because once you know why a portal refused a file you can fix it with any tool — including ours.

• Why an upload portal rejects your file — and how to get it accepted first time
  The four checks a visa, exam or job portal runs on every file, why "100 KB" can mean two different numbers, and the order to fix things in.
• What happens to your file when you convert it online — and how to check
  The difference between a converter that sends your file to a server and one that works inside your browser, and a two-minute test that tells you which one you are using.
• Scanned PDF or text PDF? Why you cannot copy the text — and how to fix it
  Why some PDFs refuse to let you select, search or convert their text, how to tell in ten seconds, and how to get the words out.

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