Compress PDF
Upload a PDF file and optimize it to try to reduce its file size. All processing happens in your browser.
Note: Frontend-only compression mainly optimizes structure. Large scanned PDFs with heavy images may not shrink much.
What is PDF Compression?
PDF compression is the process of reducing the file size of a PDF document by optimizing its internal structure. Smaller PDF files are easier to share via email, upload to websites, and store on your device. This tool optimizes the PDF structure and uses object streams to reduce file size. It works best on PDFs with redundant internal data. Note that scanned PDFs with heavy images may not shrink significantly with browser-based compression alone.
How to Use
- Select a PDF file using the file picker above.
- Choose a compression mode: "Basic optimization" for general use, or "Try maximum optimization" for more aggressive compression.
- Click "Compress PDF" to start the optimization process.
- Once complete, compare the original and compressed file sizes, then click "Download compressed PDF" to save the result.
Frequently Asked Questions
Will compression reduce the quality of my PDF?
This tool optimizes the internal structure of the PDF without modifying images or text content. The visual quality of your document remains the same. The amount of size reduction depends on how much redundant data the original PDF contains.
Why did my PDF not get smaller?
Some PDFs are already well-optimized and contain minimal redundant data. In these cases, the compressed file may be the same size or even slightly larger. This is especially common with PDFs that were already compressed or generated by modern software.
Is my PDF uploaded to a server?
No. All compression happens entirely in your browser. Your file never leaves your device, making this tool safe for confidential and sensitive documents.