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Compress PDF files online for free. Reduce file size by optimizing embedded images and removing metadata. 100% client-side, no uploads to any server.
PDF compression reduces file size by re-encoding embedded images at lower quality and removing unnecessary metadata, making files easier to share via email or upload to web forms.
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Supports multiple files. All processing happens in your browser.
| Quality | Best For | Size Reduction |
|---|---|---|
| 10–30% | Archiving, email | 50–70% |
| 30–60% | General sharing | 30–50% |
| 60–90% | Print-quality | 10–30% |
Formula
Compressed Size ≈ Original Size × (Image Ratio × Quality Factor + Text Ratio)Original Size = Total file size of the uncompressed PDF in bytes
Image Ratio = Proportion of the PDF file occupied by raster images (0 to 1)
Quality Factor = JPEG re-encoding quality as a decimal (e.g., 0.5 for 50%)
Text Ratio = Proportion of the PDF occupied by text and vector content (preserved at 100%)
Worked Example
Compressing a 10 MB PDF with 70% images at 50% quality
Did you know? The average office PDF contains 60–80% embedded images by file size, making image re-encoding the most effective compression strategy (source: Adobe PDF specification documentation).
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