PDF Tools
Compress PDF
Use this Compress PDF tool to upload one PDF, choose a compression level, and generate a lighter downloadable PDF directly in your browser when practical. Files stay local to your device during processing.
PDF compressor
Upload one PDF, choose a compression level, and generate a lighter PDF locally in your browser when practical.
Compressed PDF
Prepare compressed PDF
Upload one PDF, choose a compression level, and generate a smaller PDF when the document structure makes that practical.
This browser-based compressor rebuilds pages as compressed images. That can reduce file size for scan-heavy PDFs, but it may preserve little or no savings for text-heavy PDFs and can reduce searchability or page sharpness.
Source size
No PDF loaded
Output pages
Not generated yet
Output size
Not generated yet
Size change
Not generated yet
Need more document workflows? Visit PDF Tools or browse the PDF Tools category.
How this calculator works
This browser-based compressor re-renders PDF pages and rebuilds the output as a new PDF using image-based pages at different quality levels. That approach can reduce size for many scan-heavy or image-heavy PDFs without sending the document to a server.
Because the method depends on rebuilding page images, it is much less effective for text-only PDFs and may reduce page sharpness or searchability compared with the original document.
What the result means
A successful result means a new downloadable PDF has been created using the selected compression level. The result summary compares the source size, output size, and approximate size change so you can judge whether the rebuild actually helped.
Sometimes the output will not shrink very much, and in some cases it may even grow. That is normal for text-heavy or already optimized PDFs.
Important limitations
This is a practical browser-only compression workflow, not a full PDF optimization engine. It does not inspect every embedded asset individually, and it does not guarantee smaller output for every document.
Text-heavy PDFs, forms, bookmarks, attachments, OCR layers, and other advanced PDF features can behave differently or lose fidelity because the pages are rebuilt as compressed images.
When to use this calculator
Use Compress PDF when you have a scan-heavy or image-heavy file that needs a lighter copy for sharing, uploading, or storage.
If you only need a rough planning number instead of a rebuilt file, compare the workflow with the PDF File Size Estimator or browse the PDF tools hub.
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FAQs
Are my PDFs uploaded to a server during compression?
No. Files are processed locally in your browser and are never uploaded by this tool.
Why might compression help more for scanned PDFs than text-only PDFs?
Scan-heavy PDFs often contain large page images, so rebuilding them at lower quality can reduce file size more noticeably than it would for text-heavy documents.
Can the compressed PDF ever be larger than the original?
Yes. Some PDFs are already optimized, and some text-heavy files may not shrink much or may even grow after browser-based rebuilding.
Will compression preserve searchability and advanced PDF features perfectly?
Not always. Because the pages are rebuilt as compressed images, text searchability, OCR layers, forms, bookmarks, and other advanced features can change.
Is this professional document, archival, or compliance advice?
No. It is a browser-based utility tool only and does not provide legal, compliance, archival, or records-management advice.