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Guides
These guides answer the questions that come up again and again when people fill in online forms or work with PDFs on a phone. They are written from what we measured and built while making PDF Studio, and each one links to the tool that does the job.
How to meet photo, signature and document size limits on online formsKB, pixels, centimetres and DPI, with worked examples.Why some PDFs will not get smallerFonts, vector drawings and leftovers from editing, and what to do about each.How to scan documents with your phoneLight, angle and cropping for scans that are readable and small.Is it safe to use online PDF tools with personal documents?Upload-based vs in-browser tools, and a one-minute test to tell them apart.Why the font changes when you edit text in a PDFFont subsets, what an editor can do, and how to make changes blend in.PDF passwords explained: open password vs permissions passwordWhat each password protects, and what it does not.PDF ke saare kaam: Hindi guideSize kam karna, Word, JPG, edit, password: sab Hindi me.
Where to start
- Filling in an application form? Start with meeting size limits on online forms, then scanning with your phone.
- A PDF stays too big? Read why some PDFs will not get smaller.
- Working with private documents? See whether online PDF tools are safe and how PDF passwords work.
- Hindi me padhna hai? PDF ke saare kaam: Hindi guide.
Looking for a specific tool instead? See all tools.