Compress PDF file size
Reduce bytes where it is safe—locally—so attachments are easier to email and archive.
What is online PDF compression?
Online PDF compression helps you make a PDF smaller so it is easier to email, upload to forms, or store in the cloud—without sending the file to a remote conversion farm. Our compressor rebuilds your document locally in the browser, targeting redundant objects, stream compression, and image downsampling where it is safe. That means you keep control of sensitive contracts, invoices, and school forms while still getting a tighter byte size for everyday sharing. Whether you call it shrink PDF, reduce PDF size, or optimize PDF for web, the goal is the same: a lighter file that still reads clearly on screens and in print.
Common use cases
- Email attachments under strict megabyte limits—compress PDF files before hitting “Send” so receipts and HR packets arrive intact.
- Archiving large bundles of scanned paperwork—batch-friendly workflows where smaller PDFs save disk space and backup time.
- Faster uploads to e‑sign portals, university portals, or insurance claim systems that cap upload size for PDF documents.
How to compress a PDF here
- Drag and drop your PDF into the tool, or click to browse and select a file.
- Pick a preset that balances size and visual fidelity, then start processing.
- Download the optimized PDF immediately—everything ran on your device, not our servers.
Why choose us?
- 🔒 Completely free: no watermarks, no paywall, and no artificial cap on how many documents you can try while your device can handle them.
- ⚡ Local processing: bytes stay in your tab using WebAssembly and modern JavaScript—ideal when policies forbid uploading customer PDFs.
- 🛡️ Privacy-first: no account wall, no document vault, and no retention of your originals because we never receive them.
- 🌐 Cross-platform: use Windows, macOS, Linux, or a current mobile browser whenever you need to slim down a PDF on the go.
Frequently asked questions
Do you upload my PDF?
No. Compression runs entirely in your browser. The file never leaves your machine unless you choose to download or share it yourself.
Is there a file size limit?
There is no fixed server quota because nothing is uploaded. Practical limits depend on your device RAM, browser tab memory, and how image-heavy the PDF is—very large scans may take longer or need closing other tabs first.
Which PDF versions are supported?
We target common documents produced by modern tools—typically PDF 1.4 through PDF 2.0 feature sets. Extremely rare encryption or proprietary plug-ins may not open locally.
Will quality drop after compression?
Smaller files can trade away redundant data or downsample large photos. Text-centric PDFs usually stay sharp, while photo-heavy pages may show mild softness if you pick an aggressive preset—compare downloads before discarding your original.
Compressing PDFs locally
Compression is the polite art of making attachments smaller without turning invoices into potato-quality mush. Email gateways and mobile data plans still punish big PDFs, so a trustworthy compressor belongs in every small business toolkit—especially one that does not ask you to upload contracts to prove it.
Here, compression analyzes your file in the browser and tries to shrink streams where it is safe. Results vary: scanned pages behave differently than text-native PDFs exported from Word or Google Docs. That is normal, and it is why we encourage you to eyeball readability after every run rather than blindly trusting a percentage badge.
If you are compressing for archival, keep an uncompressed master somewhere safe and generate a smaller derivative for sharing. Browser tools make that pattern easy because you can repeat the process quickly without waiting on a remote queue or dealing with mysterious server-side limits.
When compression finishes, compare file sizes and page sharpness. If text looks soft, undo and try a lighter setting when the full controls arrive. Privacy-wise, nothing beats knowing the entire experiment happened on-device—even if the outcome is “not much smaller,” you still learned something without leaking the file.
FAQ
Will compression remove text I need?
Good compression targets images and redundant streams. You should still review the output—especially for scans—because aggressive settings can reduce clarity.
Do you upload my PDF to compress it?
No. Compression runs in your browser. Your file is not sent to us for processing.
Why is my PDF barely smaller?
Some PDFs are already optimized, or mostly contain vector text with little to compress. Scanned documents usually have more room to shrink.
Can I compress password-protected PDFs?
You will need permission to open the file in your browser first. If you cannot unlock it locally, this tool cannot magically bypass encryption.