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Why strange things happen to your files, explained without filler. Short guides about formats, compression and conversion, written to answer the exact question that brought you here.

PDF

That PDF that will not let you copy a single line

Permission restrictions and real encryption are not the same. Learn what kind of lock your PDF has and what you can do locally.

Images

AVIF vs WebP: always use AVIF is incomplete advice

AVIF is often smaller than WebP, but file size is not the whole story. Learn when each format is the better choice.

Images

Does WhatsApp compress photos? How to send them without losing quality

Yes, WhatsApp compresses photos and videos. Learn how much quality is lost and how to send important media without sacrificing detail.