How does PDF compression work?

The tool re-serialises the PDF's internal document structure — removing redundant objects and optimising streams — without re-encoding images. This reduces overhead without altering visible content.

How much can it reduce file size?

Results vary. PDFs with a lot of structural overhead can shrink significantly, while heavily image-based PDFs may see modest reductions since image data is not re-encoded.

Does compression affect visual quality?

No. The tool does not re-compress images or alter fonts, so the visual output looks identical to the original.

Does it work on scanned PDFs?

Scanned PDFs are mostly image data. The tool will still process them, but savings may be small since image streams are not recompressed.

Are my files kept private?

Yes. Compression runs entirely in your browser. Your PDF is never uploaded to any server.

Compress PDF — Reduce PDF File Size Online Free | Toolivon

Compress PDF — Reduce File Size Instantly

Compress any PDF to reduce its file size. See exact reduction percentage before downloading.

Your files never leave your browser. All processing happens locally.

Compression removes redundant cross-reference tables and re-serialises the document structure.

Drop a PDF to compress

or click to browse — max 100 MB

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How to Compress a PDF

1
Upload your PDF
Drop your PDF onto the upload zone or click to select the file you want to compress.
2
Click Compress
The tool re-serialises the PDF document structure in your browser to reduce its size.
3
Review the size comparison
See the original size, the compressed size, and the percentage reduction before downloading.
4
Download the compressed file
Click the download button to save the smaller PDF to your device.

Frequently Asked Questions

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