Scanned PDFs are the largest PDF type — each page is a full image. PDFTash compresses them 60–90% while keeping text fully readable. Free, no signup.
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A scanner at 300 DPI captures each A4 page as a ~3-8MB image. 10 pages × 5MB average = 50MB. PDFTash re-encodes these images at optimized quality — typically reaching 3-8MB total for 10 pages.
Yes. PDFTash uses a high-quality compression setting (85-90% image quality) that preserves all visible details including handwriting, stamps, and signatures in scanned documents.
Yes. Government documents, certificates, passports, and official papers compress well with PDFTash. The output is accepted by all portals that accept PDF uploads.
Scanning at 150–200 DPI (instead of 300 DPI) produces smaller files but reduces readability. It's better to scan at 300 DPI for quality and then compress with PDFTash — you get the best of both.