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PDF Compressor

Optimize PDF structure without changing visual quality, right in your browser. Need to edit the content first? Try our PDF to Word converter or PDF merger.

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Files stay on your device

Free

PDF Compressor

Upload your PDF file and compress it to reduce file size

Upload PDF File

Lossless optimization keeps text, images, links and form fields. Images are not downsampled. If optimization cannot reduce the size, you can download your original PDF unchanged.

Compress a PDF without flattening it

PDF compression should not make your file larger. FixTools compares the optimized file with the original and keeps whichever is smaller. Text, images, hyperlinks and editable form fields remain in the document.

What to expect

Structural optimization can reduce overhead in some PDFs. Scans and documents with compressed images may not shrink. There is no guaranteed percentage or target size. Signed PDFs are returned unchanged to avoid invalidating signatures.

Before you share

Compare the original and download sizes, then open the result and check its pages. Keep the source file. For a strict email or portal limit, splitting the document or exporting smaller images from its source may work better.

Frequently Asked Questions

How do I compress a PDF file?

Select a PDF and click Compress PDF. The tool optimizes its internal structure without rasterizing pages. Compare the sizes, then download the smaller result or your unchanged original.

Is PDF compression free?

Yes, our PDF compressor is 100% free to use. There's no registration required, no account needed, and no hidden fees. All PDF compression happens in your browser, so your files never leave your device and remain completely private.

What compression method is used?

The tool uses lossless structural optimization. It does not downsample images or offer lossy quality presets. Savings depend on the document; already optimized files may not shrink.

Will compressing a PDF reduce quality?

This tool keeps image and page content unchanged. Text stays selectable and form fields remain editable. If rewriting cannot make the file smaller, the original bytes are kept.

Is my PDF data secure when compressing?

Absolutely. All PDF compression happens entirely in your browser using client-side JavaScript. Your PDF files never leave your device, aren't sent to any server, and aren't stored anywhere. This ensures complete privacy and security for sensitive documents, business files, and personal information.

What file sizes can I compress?

Our PDF compressor can handle PDFs up to several megabytes in size. For optimal performance, we recommend files under 10MB. Very large PDFs with many high-resolution images may take longer to process, but all compression happens in your browser without any file size limits.

Can I compress password-protected PDFs?

Currently, our tool supports standard PDF files. Password-protected or encrypted PDFs require the password to be entered first before compression. We're working on adding enhanced support for password-protected PDFs in a future update.

What's the difference between PDF compression and PDF optimization?

This tool optimizes PDF structure. It does not recompress images or remove metadata. It cannot guarantee a target size for scans or already compressed documents.