How to compress a PDF without losing quality
By PDFEditor.ae · Published
Text and images behave differently
Compression can reduce redundant file data without visibly changing text. Photos and scanned pages are different: making them smaller can resize or re-encode the images and remove fine detail. “Without losing quality” depends on what the PDF contains and how much reduction you need.
Choose a setting and inspect the output
- Keep the original PDF so you can compare it with the compressed copy.
- Open Compress PDF and choose Low for more image detail, or a stronger setting when file size matters more.
- Compare the before-and-after size shown by the tool.
- Check fine print, signatures, seals and image edges in the downloaded copy before sharing it.
When you need exact visual fidelity
If every image must remain unchanged, avoid lossy image compression. Try removing unnecessary pages or attachments first. If the file is already optimised, a smaller output may require accepting some image-quality loss or asking the recipient about another way to send it.