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Guides
Short practical notes for the tools. They are ordinary pages, written to be read and indexed.
How to merge PDFs without uploading them
A practical way to combine PDF files on your own device with SKY13.app, including order, size limits, and what to do with a password-protected file.
How to compress a PDF on your phone
Shrink a PDF from a phone browser with SKY13.app, and know when a smaller file is worth giving up selectable text.
What stays on your device when you use SKY13.app
How SKY13.app handles PDF files, language, currency, and advertising cookies, and which jobs this browser version does not pretend to do.