Privacy and security
How to redact a PDF permanently
A black rectangle can hide information visually while leaving the underlying text available to copy, search or recover. Learn how to remove it properly.
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Paperuna guides
PDF Help Centre
Practical, honest guidance for editing, protecting and organising documents. Understand what each PDF operation changes before you use it.
OCR and accessibility
How to make a scanned PDF searchable with OCR
Scanned PDFs often contain pictures of words rather than actual text. OCR can add a searchable layer, but the quality of the scan still matters.
7 minute readRead guide
Privacy and security
Browser vs server PDF processing: what happens to your file?
Two PDF tools can look almost identical while handling your document very differently. Here is what local and server processing actually mean.
8 minute readRead guide
Privacy and security
How to inspect and remove metadata from a PDF
A PDF can reveal an author name, document title, software and modification details that never appear on the page itself.
6 minute readRead guide
Signing documents
Electronic vs digital PDF signatures: what is the difference?
A signature drawn onto a PDF and a certificate-backed digital signature may look similar, but they provide very different technical assurances.
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PDF optimisation
How to compress a PDF without unnecessary quality loss
Good PDF compression is a trade-off. The right setting depends on whether the file contains photographs, scans, text, forms or already-compressed images.
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Page organisation
How to create a printable PDF contact sheet
A contact sheet turns many PDF pages into a compact visual overview for review, indexing, printing or production planning.
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Page organisation
How to combine PDF files without uploading them
Merging PDFs is simple, but contracts, statements and personal records deserve a workflow that does not send them to an unknown server.
6 minute readRead guide
Scanning and OCR
How to scan documents to PDF with a phone camera
A careful phone photograph can become a useful PDF scan when lighting, alignment, cropping and page order are handled properly.
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Privacy and security
How to redact a bank statement safely
Bank statements contain repeated identifiers and financial context. Safe redaction requires a deliberate review, not just black rectangles.
8 minute readRead guide
PDF optimisation
How to reduce a PDF file size for email
The smallest PDF is not always the best attachment. Reduce it enough to send while keeping text, signatures and diagrams usable.
6 minute readRead guide
Page organisation
How to remove pages from a PDF safely
Deleting a page is easy; ensuring that the remaining document still makes sense requires a little more care.
5 minute readRead guide
Scanning and OCR
How to turn receipt photos into one PDF
Receipt photos become much easier to submit and archive when they are straight, readable and collected in a predictable order.
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Signing documents
How to sign a PDF without Adobe Acrobat
A visible electronic signature can be added without desktop software, but it does not provide certificate-backed identity or tamper verification.
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OCR and accessibility
How to check whether a PDF has selectable text
A document can look perfectly clear while containing no real text. A few quick checks reveal whether it needs OCR.
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