Compress PDF Online

Three quality presets, big savings on scans - all processed locally

Your email caps attachments at 10 MB and the upload form at 20 MB, but your PDF is 50 MB? This free tool compresses PDFs directly in your browser with three quality presets, re-rasterizing pages at lower resolution and compression - scanned documents typically shrink by 60-90%.

The fundamental difference from iLovePDF, Smallpdf, and similar services: no upload. Compression happens entirely on your machine, so there is no waiting for transfers and zero risk of leaking sensitive documents. Even multi-hundred-MB files are fine.

Before/after sizes are shown so you can retry with a different preset. Download the result directly, or keep editing - add bookmarks or a watermark and save everything in one pass.

How to use

Open the PDF you want to compress
Pick a quality preset in the dialog (start with "Balanced")
Wait for local compression and check the size comparison
Download the compressed file

FAQ

Will compression hurt quality?

Compression works by re-rendering pages at lower resolution. The high preset is visually near-lossless; the low preset suits screen-only reading. Try presets to find your balance.

Why is the reduction small on some PDFs?

Compression works best on scans and image-heavy files. Text-native PDFs are already small, so there is less to squeeze.

Is there a file size limit?

No hard limit - it depends on your device memory. Since nothing is uploaded, large files are often faster here than on cloud services.

Are bookmarks kept after compression?

Yes. After compressing, the tool automatically checks the result and migrates the original bookmark outline if the engine dropped it - navigation survives, which many online compressors get wrong.