Office document exported to PDFOften benefits from structural cleanupRepeated objects and removable metadata may allow a smaller rebuilt file.
Free File tool
PDF Compressor
Compress and optimize PDF files online for free. Create a cleaner PDF copy in your browser.
PDF Compressor
Rebuild a PDF with optimized object streams and removed metadata, then compare the new file with the original before downloading.
How to use PDF Compressor
- Choose a PDF file from your device.
- Run the compressor to rebuild and optimize the PDF structure.
- Download the optimized copy and compare file size and visual quality.
The interactive converter loads when JavaScript is available. The examples and guidance below remain readable without it.
PDF Compressor examples
This browser-safe compressor optimizes PDF structure rather than applying aggressive image recompression, so results depend on how the source document was created.
Large scanned documentMay show limited savingsEmbedded page images usually account for most of the size.
Already optimized PDFMay remain similar or become slightly largerAlways compare the original and output sizes before keeping the result.
Practical guidance
What this compressor changes
The tool loads the document and writes a fresh PDF using object streams while removing available metadata. This can reduce structural overhead left by editors or repeated saves. It does not intentionally change page dimensions or visual content, but you should review the output because complex PDFs can contain forms, annotations, scripts, attachments, or signatures.
Why compression results vary
Text-heavy office documents may shrink when their internal structure contains redundant data. Scanned PDFs are mostly large JPEG or lossless images, so rebuilding the container cannot provide the same savings as downsampling those images. A source that was already optimized may produce almost no reduction and can occasionally become slightly larger.
Choose the right workflow
Use this tool when you need private, local structural optimization and want to preserve normal visual quality. For a scan that remains too large, return to the scanner or document editor and lower image resolution or quality with an authorized workflow. Open the downloaded copy, compare page count and appearance, and verify important links, forms, accessibility tags, and signatures before replacing the original.
Frequently asked questions
Why is the size reduction sometimes small?
This browser-safe tool optimizes PDF structure and metadata. It does not heavily recompress embedded scanned images, which often account for most of a PDF's size.
Can the optimized PDF become larger?
Yes. A PDF that is already well optimized can produce little savings or a slightly larger rebuilt file. Compare both sizes before keeping the result.
Is PDF compression performed locally?
Yes. The PDF is read and rebuilt in your browser without uploading it to the site.