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PDF Optimizer

Shrink your PDF files with advanced lossless and lossy compression. Processed entirely locally for total privacy.

How to Compress PDF Files Free Online

PDF files can often become extremely large, making them difficult to email, upload, or share. Our free PDF Compressor tool reduces the file size of your documents instantly, without requiring any software installation. Best of all, the entire compression process happens locally in your web browser, ensuring your private documents are never uploaded to our servers.

Lossless vs. Lossy Compression

  • Lossless (Safe): This method rebuilds the internal structure of the PDF and strips out unused metadata, fonts, and hidden objects. The visual quality of the document remains exactly the same, but the file size is reduced. This is perfect for text-heavy documents.
  • Lossy (High Compression): This method flattens the PDF by converting pages into highly optimized images. It can shrink massive, image-heavy PDFs by up to 90%. However, selectable text will become flattened and unselectable.

Is it safe to compress my PDF here?

Yes! Unlike other online tools that force you to upload your sensitive files to a cloud server, our PDF optimizer uses advanced WebAssembly technology to process your files directly on your device. Your data never leaves your computer, guaranteeing 100% privacy and security.

Frequently Asked Questions

Our tool uses advanced WebAssembly to process your PDF directly in your browser. Lossless mode strips hidden metadata and unused fonts without affecting quality, while Lossy mode flattens pages into highly compressed images.
Yes, absolutely. Unlike most online tools, your files are never uploaded to a cloud server. 100% of the compression happens locally on your device.
Lossless compression keeps your text selectable and retains original quality by only removing invisible data. Lossy compression converts your PDF into images, resulting in a much smaller file size but making text unselectable.