How to compress a PDF (without losing quality)
Most PDFs are large because of their images. Text and simple shapes usually take very little space.
Three ways to make a PDF smaller
- Reduce image resolution to what you need: 150 DPI for screens or 300 DPI for printing.
- Compress photos as JPEG at around 75% quality, while keeping simple drawings as PNG.
- Optimize fonts by removing characters the document does not use.
Do it in one click
Compress PDF applies all of this for you — pick Light, Balanced or Strong, drop the file, and compare the before/after pages. Scanned and image-heavy PDFs typically drop 60–90%. Everything runs in your browser; nothing is uploaded.
Printing in black and white? Run PDF to grayscale first for an extra size cut, or split off just the pages you need with Split PDF.