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Compress PDF

Compress PDF makes a document smaller the way that actually works for scans: every page is rendered to an image at the resolution you choose and rebuilt into a lean PDF. For scanned and image-heavy files the savings are large — often 70–90%. The honest trade-off, stated up front: rebuilt pages are pictures. Selectable text becomes part of the image and can no longer be copied or searched, and a document that is already efficient text may not shrink at all. The result panel always reports the real size change, whichever way it goes.

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Accepted: PDF · Max 50 MB per file · Processed locally in your browser

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Process a file to view the result summary.

How to use Compress PDF

  1. Choose or drop the PDF — scans and image-heavy files benefit most.
  2. Pick a resolution: 150 DPI keeps print quality, 100 DPI suits screen reading, 72 DPI is the smallest.
  3. Set the JPEG quality — lower is smaller, higher is crisper.
  4. Click Compress PDF and check the reported size change before downloading.

Supported behavior

  • DPI options of 72, 100 and 150, plus a JPEG quality slider, put the size–quality trade in your hands.
  • Page count and page dimensions are preserved exactly; only the page content is rebuilt as images.
  • The result panel reports input size, output size and the real percentage change — including when a file grows.

Best for

  • Shrinking scanned documents for email attachment limits.
  • Making image-heavy reports uploadable to strict web forms.
  • Archiving scans at screen resolution instead of print resolution.

Limits

  • Text in the output is rasterized: it cannot be selected, copied or searched, and screen readers cannot read it.
  • A text-based PDF that is already optimized may come out larger, not smaller — the tool tells you plainly instead of hiding it.
  • Documents up to 500 pages can be processed; rendering is done page by page on your device, so big files take time.

Privacy notes

  • Processing happens entirely in your browser, so nothing in your document is sent anywhere.
  • Compression runs page by page in your browser tab — a confidential scan never travels to a compression server.

Related tools

Organize Merge PDF Combine several PDFs into one file, in the order you pick. Organize Split PDF Turn every page of a PDF into its own PDF file (ZIP download). Convert PDF JPG to PDF Turn several images into one PDF with size and margin options. Optimize & Edit Edit PDF Metadata See and change a PDF's title, author, subject and keywords.

Related guides

Guide How to Compress a PDF to 200KB Without Making It Unreadable How the 200KB cap works, what DPI does to readability, and the checks to run before you submit the compressed file. Updated November 6, 2026

Compress PDF FAQ

Why did my PDF get bigger instead of smaller?

It was probably already efficient: a page of real text compresses far better as text than as a picture. This tool is built for scans and image-heavy pages, and it reports the honest result either way.

Will the text still be selectable after compression?

No. Pages become images, so text is visible but not selectable or searchable. Keep the original if you need the text layer.

Which DPI should I choose?

150 DPI if the file will be printed, 100 DPI for reading on screen, 72 DPI when the smallest possible file matters more than sharpness.

How is this different from big server compressors?

Server tools often re-encode images inside the PDF while keeping text intact, which needs heavyweight software. This browser tool uses the simpler, transparent rebuild-to-image method — very effective for scans, wrong for text-native files, and it says so.