Compress PDF

How rasterize + recompress works

1. Render — each page becomes a raster image (pdf.js)
2. Re-encode — image is saved as JPEG at chosen quality (Canvas toBlob)
3. Repack — JPEGs become pages in a fresh PDF (pdf-lib)

The result: extremely effective for image-heavy PDFs (scans, slides, photo books). Less effective for text-only PDFs — they were already small, and now lose searchability without saving much space.

When NOT to use this

• Text-heavy PDFs — they get larger after rasterization. Lossy. Use as-is or run OCR if you've already lost text
• Forms / fillable PDFs — fields become flat images, lose interactivity
• Documents requiring accessibility — screen readers can't read rasterized text
• Legal / archival — original PDFs preserve embedded fonts + structure

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