Why didn't my files shrink much?

PDFs already optimised by their source tool have little slack. Image-heavy PDFs especially — for those, the only path to dramatic shrinkage is re-encoding images at lower quality, which is lossy and out of scope here.

How many files can I batch at once?

Up to 50 in one run. For more, run the tool again with another batch.

Is the visual content unchanged?

Yes — this is lossless compression. Pages look exactly the same.

Batch Compress PDFs

Run lossless compression across multiple PDFs in one go — output as a single .zip.

Your files never leave your browser. All processing happens on your device — nothing is uploaded.

1. Upload your files (min 2)

Need at least 2 files (have 0).

How does the Batch Compress PDFs work?

Compress a stack of PDFs in one click. Each file is run through the same lossless pdf-lib pass that powers Compress PDF — duplicate objects and structural overhead are removed, and the file is re-saved with object streams. The compressed copies come back as a single .zip with each file suffixed "-compressed.pdf". Expect 10–40% savings on text-and-vector PDFs (Word exports, web reports) and only modest savings on image-heavy PDFs (scanned documents).

🔒 Security & Privacy

All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.