What happens to my files?

Nothing is uploaded. Everything happens locally in your own browser.

Yes, it's completely safe. Your files never leave your computer.

Does this work offline?

Yes, once the page is loaded, you can disconnect from the internet and keep using the tool.

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Reduce PDF file size. Processed locally in your browser — no upload, no waiting.

Processed locally — nothing is uploaded

Step 1: Choose PDF

Step 2: Choose level

Step 3: Download

Large PDFs or batches?

FilKlar Desktop compresses to a target size locally on Mac and Windows — no upload. Included with Pro.

Choose PDF

Processed locally — nothing is uploaded

1Choose file(s)

2Adjust settings

3Download