Compress PDF Files

Reduce file size while optimizing for maximal PDF quality. 100% free, no signup, no watermark.

Drop a PDF here, or browse a file

Maximum size: 50 MB

document.pdf —

Compression level Low compression Highest quality, smaller file-size reduction. Best for print or archiving. Recommended compression Great balance of quality and file size — good for most documents. High compression Smallest possible file, with some loss of image quality. Best for sharing online.

This server doesn't have an image-recompression engine installed, so files are optimized with a lighter, structure-only pass (unused data and metadata are stripped and streams are recompressed). Compression levels above have no additional effect in this mode.

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How to compress a PDF file online

Upload your PDF. Drag and drop the file onto the tool, or click to browse your device.
Pick a compression level. Choose low, recommended or high compression depending on how much you value quality vs. file size.
Download the result. Compare the before/after size and download your smaller PDF.

Why use this PDF compressor

Real size reduction

Recompresses embedded images and font data instead of just guessing — typically shrinking scanned or image-heavy PDFs the most.

Quality-aware

Three compression levels let you balance visual quality against file size for the way you plan to use the document.

Privacy first

Uploaded files and generated results are automatically deleted from the server shortly after processing.

Never larger than the original

If a file is already well optimized, you get the original back rather than a bigger, "compressed" file.

Frequently asked questions

Will compressing reduce the quality of my PDF?

Low and Recommended compression are tuned to keep text crisp and images visually close to the original. High compression favors file size and may noticeably soften images.

Is it safe to compress a PDF here?

Yes. Files are only used to generate your compressed PDF and are automatically removed from the server, generally within an hour.

What is the maximum file size?

You can upload PDF files up to 50 MB in this version of the tool.

Why didn't my file get smaller?

Some PDFs — especially ones made of mostly vector text with no large images — are already close to their minimum size. In that case you'll get back a file that is the same size or only slightly smaller.