#084 · PDF Compression & Optimization Tool

Estimate PDF Compression Savings

Estimate realistic file-size savings from page complexity and image coverage without changing the original PDF.

PDF Tool

PDF to estimate
pages
Ad space

How to use this PDF tool

  1. Choose a supported pdf to estimate.
  2. Set the page range or quality options when relevant.
  3. Select Estimate Savings and wait for Complete.
  4. Review the statistics, then download the newly generated result.

What this tool does

Estimate realistic file-size savings from page complexity and image coverage without changing the original PDF.

A sampled render measures visual complexity and combines it with file size per page to produce a conservative range, not a guaranteed compressed size.

The downloadable JSON report records assumptions and an estimated range; actual compressors can differ.

Supported formats

Standard PDFs readable by PDF.js. Up to five evenly spaced pages are sampled at reduced resolution.

Inputapplication/pdf,.pdf
ProcessingLocal browser session
Input limit250 MB; available memory may be lower

Tips for better results

  • Keep the original file until you have checked the result.
  • Close memory-heavy tabs before processing large documents.
  • Use a short page range for a quick test.
  • Signed or encrypted PDFs need special care.

FAQ

How accurate is a PDF compression savings estimate?

It is directional. Image encoding, font reuse, object streams, and the compressor used can move the final size outside the estimate.

Does this tool upload my PDF to test compression?

No. PDF.js samples pages locally in your browser and the original file is not sent by this page.

Why is the estimate a range instead of one number?

Different compression engines and quality settings produce different results, so a range is more honest than a fixed promise.

Can scanned PDFs save more space than text PDFs?

Often yes, especially when scans use unnecessarily high resolution, but already optimized scans may save little.

Does the estimator modify or compress the PDF?

No. It creates a JSON analysis report; use a compression tool separately to modify the PDF.

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Processing details

PrivacyLocal processing
ResultNew downloadable file
LimitsBrowser and format support

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