About PDF Compression
This tool reduces PDF file size by re-rendering each page as a JPEG at a chosen resolution, then assembling a new PDF. It works well for image-heavy or scanned PDFs but may not shrink text-only PDFs much (those are already compact). All processing happens in your browser via pdf.js and jsPDF.
Frequently Asked Questions
- How much smaller will my PDF be?
- Reduction varies wildly. Image-heavy PDFs often shrink 50–90%. Text-only PDFs may shrink only 10–30% or even grow slightly, because they were already efficiently compressed.
- Will the text remain selectable?
- No. This tool rasterizes pages to images, which means text becomes part of a picture and is no longer selectable or searchable. For text-preserving compression, use a desktop PDF editor.
- Is the compression lossy?
- Yes — pages are converted to JPEG, which is lossy. Pick the High preset for the least visible quality loss.
- Is my file uploaded anywhere?
- No. Compression happens entirely in your browser. The original PDF and the compressed PDF never leave your device.
- What is the file size limit?
- 100 MB input. Very large files may be slow to process depending on your device's CPU.