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)

Drop PDF files here

or click to browse (max 50)

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.

Frequently asked

No. Every file is processed in your browser via pdf-lib.

For heavier PDF workflows

Amazon affiliate

Adobe Acrobat Pro (subscription)

Industry-standard PDF suite

Shop on Amazon

Nitro PDF Pro (one-time license)

Shop on Amazon

Portable document scanner (ADF, duplex)

Shop on Amazon

As an Amazon Associate we may earn from qualifying purchases. This does not add cost for you.

Related PDF tools

Compress PDF

Reduce a PDF's file size. Pick a quality preset — High keeps the file visually identical (lossless); Medium and Low re-encode images for much bigger savings.

Compress PDF (Aggressive)

Maximum-compression PDF squeeze — re-rasters every page as a JPEG. Big size reduction, but the text becomes non-selectable.

Batch Merge PDFs

Drop in a stack of PDFs and merge them into groups — by basename prefix or by chunk size — output as one merged PDF per group inside a .zip.

Zip PDFs

Bundle multiple PDFs into a single .zip — no PDF processing, just packaging for easy email or upload.

More tools you might like

Hand-picked tools that pair well with this one — same audience, same intent.

Batch Merge PDFs

PDF

Drop in a stack of PDFs and merge them into groups — by basename prefix or by chunk size — output as one merged PDF per group inside a .zip.

Compress PDF

PDF

Reduce a PDF's file size. Pick a quality preset — High keeps the file visually identical (lossless); Medium and Low re-encode images for much bigger savings.

Zip PDFs

PDF

Bundle multiple PDFs into a single .zip — no PDF processing, just packaging for easy email or upload.

Compress PDF (Aggressive)

PDF

Maximum-compression PDF squeeze — re-rasters every page as a JPEG. Big size reduction, but the text becomes non-selectable.

Batch Watermark PDFs

PDF

Stamp the same watermark across a folder of PDFs — diagonal / horizontal / footer position, with size and opacity controls.

Batch Page Extract

PDF

Extract the same page-range from many PDFs at once — output a ZIP with one trimmed PDF per source.