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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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.
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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.
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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.
6 minute readRead guide