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PDF Compressor

Reduce the file size of a PDF in seconds — directly in your browser. Aaroka optimizes the document's internal structure so it's easier to email, upload, or store, while keeping it private because your file is never sent to a server.

What does the PDF Compressor do?

The Aaroka PDF compressor rebuilds your PDF using object streams and optimized cross-reference tables. This removes redundant metadata and structural overhead, which typically shrinks the file — especially PDFs that were generated by scanners, word processors, or "print to PDF" tools.

Because it runs fully client-side with the open-source PDF-Lib library, your document never leaves your device. That makes it safe for contracts, invoices, ID scans, and any other sensitive file.

How to compress a PDF

  1. 1Upload your PDF. Click the upload area or drag & drop a .pdf file.
  2. 2Choose a compression level. Higher levels enable more aggressive object-stream optimization.
  3. 3Click "Compress PDF". The tool processes the file locally.
  4. 4Download the result. Compare the before/after size and save your compressed PDF.

Why compress a PDF?

  • Email attachments have size limits (often 10–25 MB) — compression helps you stay under them.
  • Smaller files upload and download faster on slow connections.
  • They consume less cloud storage and backup space.
  • Websites load linked PDFs more quickly for visitors.

Frequently asked questions

Is the PDF compressor free?

Yes, it is completely free and unlimited with no watermarks or sign-up.

Are my PDFs uploaded anywhere?

No. Compression runs entirely in your browser, so your documents stay on your device.

Will compression affect quality?

The optimizer restructures the PDF without re-encoding text, so readability is preserved. Image-heavy scanned PDFs compress less.

Why did my PDF get only slightly smaller?

Some PDFs are already well optimized, so there is little overhead to remove. The tool will show "Already optimized" in that case.

Is there a file size limit?

There is no server limit. Very large files depend only on your device's available memory.