Compress PDFs Online and Instantly
Reduce File Size
With just a few clicks, you can use Lumr’s PDF compressor tool to instantly reduce the size of your document. It’s all done online, with no need to download any software.
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
How To Compress PDFs Online in 3 Simple Steps
Upload your PDF
Drag and drop your file into the upload area above, or select it from your computer.
Compress the PDF
Instantly compress your PDF without sacrificing quality.
Download your compressed PDF
Download your smaller-sized file, perfect for sharing via email or for taking up less storage space.
A Smaller Size PDF in Seconds
Need a smaller size document? Lumr keeps the quality identical in a smaller PDF.
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
Reduce PDF Size In Seconds
With Lumr
Quickly compress large PDF files right from your browser. Work faster without having to download extra tools or software.
Makes your files smaller
Instant size reduction
Is your PDF file too large to send via email or upload to another site? Instantly make it smaller with our intuitive tool.
No need to download PDF compressor software
100% online & browser-based
Compress PDFs online from any browser, including Chrome, Safari, Opera, Edge, and more. No need to install an app or desktop program.
Simple file resizing
Effortless in just a few clicks
You do not need any technical experience to use our tool. It just takes a couple clicks.
No impact on document quality
Clear text & sharp images
Our tool does not affect the quality of your PDF. It will remain completely readable after compression.
Compress PDFs with any device
One tool for every platform
Lumr works on all types of devices, including Windows, macOS, Linux, and both iPhone and Android.
Increase productivity
Save time and get back to work
Say goodbye to wasting your time trying to make your files smaller. Compress them instantly and get back to work.
Why Lumr is Trusted for PDF Compression
Lumr users recommend us for resizing PDFs online. See why below.
“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
FAQs About Our PDF Compressor
Still have doubts about how to reduce PDF file size? Check out the FAQs below.
Will compressing my PDF reduce the quality?
Lumr successfully reduces the size of your documents without sacrificing image quality. All images and text in your PDF will remain fully legible after compression.
The tool is perfect for you if your PDF contains lots of charts and images.
Will my compressed PDF meet email or government website upload limits?
Most PDFs can be successfully uploaded after compression with Lumr.
The exact file size accepted by government agencies and email providers varies. Email providers usually cap it at 20 or 25 MB. Government and corporate sites are often stricter, sometimes allowing only 2 to 5 MB PDFs.
When you compress a PDF with our tool, it’s highly likely that your file will be smaller than these limits.
Is it safe to upload confidential or private documents to this PDF compressor?
Yes, uploading documents is safe with Lumr. We use industry-standard encryption to make sure that any file you upload remains fully private.
We do not store your files after you upload them. Once you have compressed the PDF, there is no trace of it left on our servers.
Do I need to download an app or software to use this compressor tool?
No, you will never have to download software when compressing PDFs with Lumr. Our tool works with any browser, on any device. Just upload your file, and instantly download the compressed version. It’s really that simple.
Can I upload really large PDFs on Lumr?
Yes, Lumr allows you to upload large PDFs. It’s possible to upload files that are up to 100 MB in size.
Can I compress a PDF on my iPhone or Android?
Yes, Lumr’s tool can be used on mobile devices like iPhone, Android and tablets. It’s simple to use, even on mobile browsers: just find the PDF in your files, upload it, and download the compressed version instantly.
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