Compress PDF

Try three browser-based compression levels for image-heavy PDFs.

Client-side compression works best for:

PDFs with large uncompressed images
Scanned documents with high-resolution images
PDFs created from Word/PowerPoint with embedded photos

Already optimized PDFs may not compress further.

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Processed privately in your browser — your files never leave your device.

About PDF compression

Compress PDF targets eligible JPEG image objects. Choose a level, compare the result, and download the smaller file when recompression helps.

PDF compression features

Choose three compression levels
Target large JPEG objects
Return the original if it is smaller
Process locally

Reduce a PDF that is large because of embedded JPEG photos. Try light, medium, or strong settings; the tool keeps the smaller output when recompression saves space. Results can be modest or unchanged.

What does this PDF compressor change?

The compressor inspects pages and recompresses eligible JPEG image streams, resizing them at the chosen level. It does not optimize every PDF object or guarantee a large reduction for text-only files.

When PDF compression helps

Photo-heavy reports

Reduce reports containing large JPEG photographs before sharing.

Email attachments

Try a lighter output when an image-heavy PDF is just over a limit.

Compare trade-offs

Test levels and keep the output only when size and clarity suit your use.

How browser PDF compression works

The client loads the PDF, checks image XObjects, and processes qualifying JPEG streams through a canvas at the chosen quality and scale. Metadata is rewritten while saving. If output is not smaller, the original is offered.

Compression levels

Level	Trade-off
Light	Smaller change and higher quality
Medium	Balanced size and quality
Strong	More aggressive recompression and possible visible loss

Device and browser notes

Works in current Chrome, Edge, Firefox, and Safari. Browser memory limits large PDFs or images, especially on mobile.

Compression limitations

Only eligible JPEG objects are targeted; PNG, text, fonts, and many streams may be unchanged. Savings and any percentage reduction are not guaranteed. Metadata may be rewritten, so verify important documents.

Frequently Asked Questions

Will compression always make my PDF smaller?

No. If recompression does not reduce byte size, the tool returns the original. Savings vary by file.

Which level should I try?

Start with Light, then compare Medium or Strong when a smaller attachment matters more than image fidelity.