Compress PDF
Shrink PDFs that are too big for email or portal uploads. Compression runs entirely in your browser, so your files never leave your device — nothing to install and no sign-up.
Upload a PDF to compress
or drop your file here
// Benefits
Reduce PDF size for email and uploads
DockDocs Compress PDF shrinks files right in your browser, so documents fit email and upload limits without ever being sent to a server.
Fit email & upload limits
Bring oversized PDFs down to a size that clears common email attachment caps and portal upload limits, so files send and submit the first time.
Stays on your device
Compression happens entirely in your browser. Your PDF is never uploaded, so sensitive documents stay private.
Free with no watermark
Compress as many PDFs as you need at no cost — no account, no email, and nothing stamped onto your file.
// Workflow
How PDF compression fits into document work
Compress PDF is designed for common office moments: files are too large for email, a portal requires a size limit, or sharing needs to be faster.
- 1
Select a PDF file from your device.
- 2
DockDocs compresses the file while preserving readability.
- 3
Download the compressed PDF ready for sharing.
Compress PDF FAQ
How do I compress a PDF?
Drop a PDF onto the tool (or click to choose one from your device), pick a compression level, and let it process. When it's done, download the smaller PDF. There's nothing to install and no sign-up.
How does the compression actually work?
To shrink the file, each page is re-rendered as an optimized image and rebuilt into a new PDF. That's why the biggest savings come from scanned or image-heavy documents. The trade-off is that any real text on the page becomes part of the image, so it's no longer selectable or searchable in the output. Compression levels let you trade quality for size — lower quality means a smaller file.
Are my files uploaded anywhere?
No. Everything runs entirely in your browser on your own device. The file is never uploaded to a server and never leaves your device, so even sensitive documents stay private.
Is there a file size limit?
There's no fixed size limit we impose. The practical ceiling is your device's memory, since the whole PDF is processed in the browser. Very large or high-page-count files use more RAM and take longer, and on a low-memory phone a huge PDF may struggle — but typical documents compress fine.
What do I get back, and will the text still be selectable?
You get a standard PDF back, just smaller. Because pages are rasterized to images during compression, text on the compressed pages is no longer selectable or searchable. If keeping selectable text matters, compress a copy and keep your original. Also note that an already-small PDF (like a plain-text document) may not shrink much — compression helps most when there are images or scans to optimize.
It's a scanned document — anything I should know?
Scanned PDFs usually compress well since they're already images. But the result still won't be searchable, and if your scan wasn't searchable to begin with, compressing it won't add that. To make scanned text searchable, run it through OCR first (or instead), then compress if you still need a smaller file.
Is it free?
Yes, completely free. No account, no email, no watermark on your file, and you can compress as many PDFs as you want.
Don't take our word for it — verify it
This tool runs entirely in your browser. Your file never leaves your device — it isn't uploaded to any server.
Check for yourself: open your browser's developer tools (F12, or right-click → Inspect) → the Network tab → then run this tool. You won't see your file uploaded anywhere, because the work happens locally on your device.
// Recommended reading
Related guides and support for this workflow.
Continue from the tool page into crawlable DockDocs guides, resources, help content, and AI-readable workflow hubs.
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