Don's Tools · PDF · Compress PDF

Compress PDFs

Shrink up to 100 PDFs at once, right in your browser. Big savings on scans and photos, a lossless option for text, and never larger than you started. Nothing is uploaded.

Mode
Compression
65%
↑
Drop PDFs here
or tap to choose · up to 100 at once · your files stay on your device
Your PDFs will appear here
Compress PDF is a free batch tool to reduce the size of up to 100 PDFs entirely in your browser. Choose Recompress images to re-render pages as compressed images for large savings on scanned and image-heavy PDFs, or Keep text to losslessly slim text PDFs while keeping text selectable. Adjust quality and resolution, optionally convert to grayscale, see each file before and after, download files one by one or all together as a zip, and the result is never larger than the original. Your PDFs are never uploaded and stay on your device.

Frequently asked questions

How many PDFs can I compress at once?

Yes, up to 100 per batch. Everything runs on your device, so a big batch depends on your computer's memory and speed. On older phones or low-memory devices, very large or very many PDFs may slow down, so just do them in smaller groups.

Are my PDFs uploaded anywhere?

No. Every PDF is opened and compressed inside your browser on your device, and nothing is ever sent to a server.

How much smaller will my PDFs get?

It depends what is inside. Scanned or image-heavy PDFs often drop by around 40 to 70 percent, while mostly-text PDFs only shrink a little. If a file is already well optimised, the tool keeps the original so the result never ends up larger.

What is the difference between the two modes?

Recompress images re-renders each page as a compressed image, which gives big savings on scans and photos but turns the text into part of the image so it is no longer selectable. Keep text re-saves the file and strips unused data losslessly, so the text stays selectable but the savings are smaller.

Will the quality drop?

In Recompress mode you control it with the Quality slider and Resolution, where lower settings mean a smaller file and softer images. Keep text mode is lossless and does not change how anything looks.