Choose a level
Strong, recommended, or light — balance size against quality.
Compress PDF
Shrink a PDF for email or upload. Choose a compression level and see the before/after size — processing is local, with no upload.
Compression rasterises each page to an image. Best for scanned documents; text becomes non-selectable.
Before / after
See the exact size and percentage saved before you download.
In your browser
Pages are rasterised locally with pdf.js — nothing is uploaded.
Frequently asked questions
How does compression work?
Each page is converted to a JPG image at the chosen quality and a new PDF is assembled. This cuts size substantially, especially for scanned documents.
Why does the text become non-selectable?
Because pages become images, the text is no longer text but part of the picture. Keep the original if you need selectable/searchable text.
Is my file uploaded?
No. All compression runs in your browser via pdf.js and pdf-lib — the file never leaves your device.
Why is the file sometimes larger?
A text-only PDF is already compact; rasterising can enlarge it. If so, pick a stronger level or keep the original.