Compress multiple PDF files at once

Upload multiple PDFs and compress them all at once. Download a ZIP with all compressed files. Free and local — nothing is uploaded.

Drop PDF files here (multiple allowed)

Drop here or click to choose

Files stay on your device — nothing is uploaded

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Your file is processed in your browser and never uploaded.

How does it work?

1
Drop your PDFs here
You can select or drag multiple files at once.
2
Compress
Click the button — each file is compressed.
3
Download ZIP
Download a ZIP with all compressed PDFs.

Frequently asked questions

How many files can I process at once?

No limit — everything happens locally in your browser. Many large files may take a moment.

How much is saved?

It varies per PDF. Simple documents can shrink significantly. PDFs with many images or already-optimised files shrink less.

Are my files uploaded?

No. Everything happens in your own browser. Your file never leaves your device and is not stored anywhere.

Is it free?

Yes, completely free, without watermark or account. The site is paid for by ads.

Why in the browser?

PDFrust runs entirely in your browser using WebAssembly and modern JavaScript libraries such as pdf-lib and PDF.js. Your file is never sent to a server — all processing happens locally on your device. This means your documents remain private by design, regardless of what they contain. There is no account required, no file size limit, and nothing is stored after you close the tab.