How much will my PDF be compressed?

Compression ratio depends on the content. PDFs with high-resolution images typically shrink 40–70%. Text-only PDFs may compress 10–20%.

Does compression reduce quality?

We use lossless compression by default, which preserves full quality. An optional lossy mode reduces image DPI for smaller file sizes.

No. Compression runs entirely in your browser. Your PDF never leaves your device.

There is no enforced limit — but very large PDFs (over 200 MB) may take longer depending on your device.

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Reduce your PDF file size without sacrificing quality. Lossless compression runs entirely in your browser.

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Up to 70% smaller

Image-heavy PDFs shrink dramatically. Text PDFs also benefit from structure optimisation.

In-browser only

Zero uploads. pdf-lib handles all compression locally in your browser tab.

Quality preserved

Lossless compression removes redundant metadata and stream overhead — not your content.

: Compression ratio depends on the content. PDFs with high-resolution images typically shrink 40–70%. Text-only PDFs may compress 10–20%.
: We use lossless compression by default, which preserves full quality. An optional lossy mode reduces image DPI for smaller file sizes.
: No. Compression runs entirely in your browser. Your PDF never leaves your device.
: There is no enforced limit — but very large PDFs (over 200 MB) may take longer depending on your device.