How to Compress PDF Files
Lower PDF file size directly in your browser and keep your workflow fast for sharing and storage.
Step-by-step compression workflow
- Upload your PDF: Click the Add PDF file button and select the PDF you want to compress from your device.
- Choose compression level: Select the desired compression level or quality setting based on your size and clarity requirements.
- Start compression: Click the Compress PDF button and let the tool process your file in the browser.
- Download the compressed file: Once processing is complete, download the optimized PDF to your device.
Related tools
FAQ
Does this PDF compressor upload my file to any server?
No. All compression happens inside your browser using pdf.js and pdf-lib. Your PDF never leaves your device, and nothing is uploaded or stored.
How does this tool compress a PDF?
Each page is rasterized into a JPEG at a chosen quality level (low, medium, or high compression). The JPEGs are then rebuilt into a new PDF.
Why does the text inside my PDF become non-selectable?
The compressor flattens text, vectors, and fonts into images to achieve maximum compression.
What do the compression levels mean?
Low = best quality, Medium = balanced, High = smallest size but lower clarity.
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