Why PDF files get large
PDF size usually comes from images, embedded fonts, duplicated resources, and document metadata. A one-page scanned contract can be much larger than a fifty-page text document because the scan is stored as a high-resolution image.
Before compressing a PDF, decide what quality you need. A document meant for reading on screen can usually be smaller than a file prepared for professional print.
What PDFMood optimization does
PDFMood rebuilds the file in your browser, removes some metadata, and saves with object streams where possible. This can reduce overhead for some PDFs without sending the document away from your device.
Because the current tool avoids destructive image downsampling, it preserves visual quality. That also means some image-heavy PDFs may not shrink dramatically. If a scan is still too large, exporting the scan at a lower resolution before converting to PDF can help.
Best practices before sharing a PDF
Open the compressed file and check small text, signatures, stamps, and charts. If the document must be submitted to a government, school, or legal portal, confirm the portal’s file size and format rules first.
Keep the original file until the recipient accepts the optimized version. Compression is convenient, but the original remains your safest archive copy.