PDF Image Compression

General PDF compression targets all content including text streams. Image compression specifically targets only the raster images embedded in the PDF, leaving text and vector graphics untouched.

Downsampling reduces the pixel resolution of embedded images. A 300 DPI photo can be downsampled to 150 DPI, halving the pixel count and significantly reducing file size. For screen viewing, 72–96 DPI is sufficient.

No. Text in PDFs is vector data and is not affected by image compression settings. Text will remain sharp regardless of the image quality setting you choose.

85% quality is the standard for professional documents — noticeable size reduction with minimal quality loss. 60–70% is suitable for web sharing. Below 50% produces visible artefacts.

Yes. Scanned PDFs are essentially images, so this tool directly reduces their resolution and quality. For scanned documents, JBIG2 or CCITT compression settings yield better results for black-and-white text.

Yes. All image compression runs in your browser. Your PDF is never transmitted to any server.