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Compress PDF
Reduce scanned and image-heavy PDF file sizes. Everything happens locally in your browser.
Drop a PDF here or click to browseOne PDF, up to 100 MB
PDF selected
Compression level
Important: pages are rebuilt as optimized images. The visual layout remains, but selectable text, form fields, links, and annotations will not remain interactive. Best for scans and image-heavy PDFs.
Preparing...0%
Your compressed PDF is ready
Your PDF stays on this device. We never upload or store it.
How to compress a PDF
- Select a scanned or image-heavy PDF.
- Choose light, balanced, or strong compression.
- Review the size change and download the optimized PDF.
Frequently asked questions
Is this PDF compressor free?
Yes. There is no sign-up, payment, watermark, or usage charge.
Which files get the best result?
Scans and image-heavy PDFs usually shrink the most. A small, text-only PDF may already be optimized and can become larger after image conversion.
Is compression private?
Yes. The browser processes every page locally, so the original file is not sent to blackccbox.