How to compress a PDF for email and online forms in the UK
Quick answer: Reduce large images and use a PDF compression or optimisation tool, then check the new file before uploading it to an online form or sending it by email.
Find what is making the PDF large
Scanned pages and high-resolution photographs are common causes. Reducing image resolution can save far more space than changing ordinary text.
Compress for the intended use
For an online form or email attachment, aim for a smaller file without making text difficult to read. Keep an original copy before aggressive compression.
Open and verify the result
Check the compressed document page by page, confirm that links and forms still work, and make sure important diagrams or signatures remain legible.
Source & methodology
Adobe’s UK Acrobat documentation directly explains PDF size reduction and optimisation.