# PDF Compressor

> Repack a PDF with compressed object streams to reduce its file size.

URL: https://uttir.com/pdf-compressor
Categories: pdf-tools
Privacy: Your PDF is compressed locally in your browser and never uploaded.

## About

This compressor re-saves your PDF using compressed object streams, which compacts the document structure and removes redundant objects. It shows the original and new size plus the percentage change before you download.

It is lossless — text, vectors, and images are preserved exactly. Savings are largest for PDFs produced by tools that write uncompressed structures.

## How to use

1. **Choose a PDF** — Up to 50 MB.
2. **Review the savings** — Original vs. compressed size is shown.
3. **Download** — Keep whichever file is smaller.

## FAQ

### Why didn’t my PDF shrink much?

If the PDF is already optimized, most of its size is in compressed images and fonts that lossless repacking cannot reduce. For bigger wins, lower image quality with the Image Compressor before creating the PDF.

### Is anything lost in compression?

No. This is structural optimization, not quality reduction — content is preserved exactly.

### How much can a PDF be compressed?

It depends on the content. Image-heavy PDFs compress 50-80%. Text-only PDFs compress 10-30%. The tool re-saves the images inside the PDF at a lower quality, which is the main lever.

## Related tools

- [PDF Merge](https://uttir.com/pdf-merge) — Combine multiple PDFs into one, in the order you choose.
- [PDF Split](https://uttir.com/pdf-split) — Extract a page range from a PDF into a new, smaller document.

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For the full HTML page with the live tool, visit https://uttir.com/pdf-compressor.
This file is the markdown rendering at https://uttir.com/pdf-compressor.md. See https://uttir.com/llms.txt for a site-wide summary.