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Compress PDF

Trim a PDF by rewriting its internal structure. Image quality is never reduced, and you'll always see the real before-and-after size.

  • No uploads
  • Runs on your device
  • Works offline once loaded

Select a PDF file

or drag and drop here · one PDF

Processed on your device. Never uploaded.

How to use Compress PDF

  1. 1Choose a PDF.
  2. 2Pick whether to remove document metadata.
  3. 3Compress, compare the sizes and download if it's smaller.

This tool rebuilds the PDF with compressed object streams and drops unreferenced objects and leftover metadata. Files exported by some office apps or edited many times often shrink noticeably; files that are already optimized, or that consist mostly of photos, may barely change. Lossy image down-sampling isn't offered yet, because it can visibly reduce quality and we'd rather be upfront than silently degrade your document.

Questions

Why didn't my file get smaller?

Compression depends on what's inside the PDF. If it's already efficiently saved or mostly JPEG photos, there's little structural waste to remove. We'll tell you rather than hand back a bigger file.

Will image quality change?

No. Images are copied byte-for-byte.

Do you upload the file to compress it?

No. Compression runs in a Web Worker in your browser.