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PDF OPTIMISATION · ONLINE
Compress PDF Online
Reduce file size locally with visual compression.
Reduce file size locally with visual compression. Keep the source until you've opened and checked the downloaded result.
Compression can affect image quality, so inspect small text and scans afterwards.
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Compress PDF: what the result contains
Reduce file size locally with visual compression.
Smaller files can cost visual detail
PDF compression is most noticeable on image-heavy and scanned documents. Text stored as vectors may remain sharp while photographs, scans or rasterised pages show the quality trade-off first.
Text-only PDFs often have little to compress. Aggressive settings make the biggest difference on scans and photographs—and can also make them look softer.
Where Compress PDF fits cleanly
Use it when you need to fit a PDF under an email attachment limit; it also fits when you need to reduce storage used by scan-heavy documents. If the job asks for more than that, split the workflow rather than making one tool do two different things.
When Compress PDF isn’t the right endpoint
If the document is already mostly text and small in size, aggressive compression may achieve little. If exact visual fidelity matters more than size, keep the original or use a lighter setting.
FAQ
What does Compress PDF actually do?
Reduce file size locally with visual compression.
What should I check before I use the output?
PDF compression is most noticeable on image-heavy and scanned documents. Text stored as vectors may remain sharp while photographs, scans or rasterised pages show the quality trade-off first. Text-only PDFs often have little to compress. Aggressive settings make the biggest difference on scans and photographs—and can also make them look softer.
Related tools
If Compress PDF solves only one part of the document job, keep the next operation separate so the result is easy to verify. The PDF workflow guide has broader context if you need it.