Compress your PDFs
without losing quality.
or drop your files here
Max file size 100 MB
- No signup needed
- Private & encrypted
- 256-bit SSL
- AES-256 encrypted
- SOC 2 Type II
Compress in 3 easy steps
Upload your file
Upload the PDF you want to shrink down to a smaller size.
Pick a compression level
Choose how much to compress, we keep your text sharp and images clear.
Download or share
Download your smaller PDF or share it directly with others.
One place for every PDF task
Every tool you need to edit, convert, sign, and manage your PDF documents.
Same document, smaller size.
Drop the size, keep every pixel. Here is the same document before and after compression.
28 MB 4.5 MB. Visually identical.
We keep text sharp, downsample images smartly, and strip invisible bloat.
83.9% smaller · Pixel-equivalent on screen · Searchable text preserved
The PDF compressor people
actually rely on
Powerful compression, zero quality loss. Everything you need to shrink PDFs online.
Significantly smaller files
Up to 90% smaller
Cut PDF size for email, upload, and storage without the hassle of desktop software.
No visible quality loss
Crisp text, clear images
Smart compression keeps text razor-sharp and images clear, so your document still looks great.
Compression levels
You stay in control
Pick low, medium, or high compression to balance file size against quality for your needs.
Compress in bulk
Many files at once
Compress several PDFs in one go and download them together, no repeating yourself.
Private and secure
AES encrypted
Your files are encrypted in transit and processed securely. We never share your documents.
Works in your browser
Any device, no install
Compress PDFs on desktop, tablet, or phone, nothing to download or install.
Trusted every day,
by people like you
See what people are saying about compressing PDFs with lumr.
TrustScore 4.6 · Based on 3,247 reviews
“Our email gateway kept rejecting big PDFs. lumr shrinks them in seconds and they still look perfect.”
Sarah M.
Marketing Manager
“I send heavy portfolio PDFs to clients all the time. Compressing first saves everyone the upload pain.”
James K.
Freelance Designer
“Listing packets used to be huge. Now I compress and send them from my phone between showings.”
Ana L.
Real Estate Agent
We answer
your questions
Everything you need to know about compressing PDFs online.
Our smart compression keeps text sharp and images clear, for most documents the difference is invisible. Choose a lower compression level if you need maximum fidelity.
Absolutely. Your files are encrypted with AES during transfer and processed securely. We follow GDPR best practices and never share your documents with third parties.
It depends on the content, image-heavy PDFs often shrink by 70-90%, while text-only files compress less because they are already small. You will see the new size before downloading.
You can compress any PDF. If you have a Word, PowerPoint, or image file, convert it to PDF first with our converter, then compress.
You can upload PDF files up to 100 MB. For most documents this is more than enough. Larger files can be split first with our Split PDF tool.
Security you can trust
Independently audited and compliant with the security and privacy standards your documents demand.
- SOC 2 Type II
- GDPR
- ISO 27001
- HIPAA
- eIDAS
- PCI DSS
Ready to shrink your PDF?
Join millions of users who trust lumr for fast, high-quality PDF compression. No fees, no hassle.
- Ready in 3 seconds
- 256-bit SSL secure
- Works on any device