How to use this tool
- Choose a PDF from your device.
- Select structure-preserving or strong page compression.
- For strong compression, choose DPI, quality and color.
- Compress locally, compare sizes and download the PDF.
Supported input and output
PDF input and PDF output. The downloaded file keeps the original filename.
Large-file guidance
Available memory depends on your device and browser. Close other tabs before processing a large document, keep the device awake, and test the downloaded result before deleting the original.
Known limitations
- Structure-preserving mode reorganizes PDF objects but does not lower embedded image resolution, so some files may not become smaller.
- Strong compression rasterizes pages and removes selectable text, links, forms, layers and accessibility structure.
- Encrypted PDFs are supported only by strong compression when the correct opening password is provided.
- Very large or long PDFs may exceed browser memory.
Frequently asked questions
Which PDF compression method should I choose?
Choose structure-preserving mode when searchable text and links matter. Choose strong compression when reducing visual PDF size is the priority.
Does this upload my PDF?
No. The PDF is read and compressed in this browser; there is no file-upload endpoint or third-party processing API.
Why did the structure-preserving result get larger?
The PDF may already be optimized. Rebuilding object streams can add slight overhead; keep the original or try strong compression.