PDF Merger
Combine multiple PDF documents in your chosen order.
PDFPDF tools
PDF Compressor
Rebuild a PDF with object streams; size savings vary by document.
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How to use pdf compressor
- Choose one unencrypted PDF within the stated file and page limits.
- Select Create PDF to rewrite the document using object streams.
- Compare the original and output sizes, then inspect the downloaded PDF.
Work through an example
Understand what ERITHRA PDF compression changes, compare actual output bytes, and recognize when image downsampling is needed elsewhere.
Try a PDF object-stream rewrite and measure the saving →Formats, privacy, and practical limits
Up to 30 MB per PDF and 100 pages per operation. Password-protected PDFs are not supported. Processing stays in this browser. PDF rewriting may invalidate digital signatures.
Files and generated results exist only for this tab session. Download any result you want to keep before leaving the page. Browsers may use temporary memory or disk cache while processing.
Frequently asked questions
Does this tool downsample embedded photographs?
No. It rewrites PDF structure with object streams; it does not promise image downsampling or a particular percentage saving.
What if the output is larger?
That can happen with an already efficient PDF. Keep the original when size is the main concern and the rewritten copy offers no benefit.