Compress PDF Online
Reduce PDF file size with OmnisPDF. Compress PDFs for faster sharing, easier uploads, and smaller email attachments — quick and browser-based.
Drop your files here
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Supported formats: .pdf
Use OmnisPDF's Compress PDF tool to reduce PDF file size in seconds. Perfect for email attachments, upload limits, and faster sharing — upload your PDF, compress it, and download a smaller file instantly.
- ✓ Reduce PDF size quickly for email and uploads
- ✓ Keep PDFs readable and shareable after compression
- ✓ Great for scanned PDFs, image-heavy files, and long documents
- ✓ Works on Mac, Windows, iOS, Android, and Linux
- ✓ No installation — compress PDFs in your browser
Reduce PDF File Size for Email and Upload Limits
Many services cap attachment sizes. OmnisPDF helps shrink PDFs so they're easier to send and upload without splitting.
Compress Image-Heavy and Scanned PDFs
Scans and photo-based PDFs can be huge. PDF compression reduces image data to create a smaller file while keeping pages usable.
Fast Online PDF Compression
Upload, compress, download. No software required — OmnisPDF runs directly in your browser.
How to Compress a PDF
Upload or drag and drop your PDF into OmnisPDF.
Choose your compression level: Light (best quality), Medium (balanced), or Extreme (maximum reduction).
Click Compress PDF and download your smaller file.
Frequently Asked Questions
How do I compress a PDF with OmnisPDF?
Upload your PDF, click Compress PDF, then download the smaller file.
Will compressing a PDF reduce quality?
Compression can reduce file size by optimizing images and data. Text usually remains readable, but image-heavy PDFs may lose some detail depending on compression level.
Why is my PDF still large after compression?
If the PDF is already optimized or contains high-resolution images, the size may not drop much. Try splitting the PDF into smaller parts.
Can OmnisPDF compress scanned PDFs?
Yes — scanned PDFs are often the best candidates for compression because they contain large embedded images.
Can I compress a PDF on my phone?
Yes. OmnisPDF works in mobile browsers — upload, compress, and download directly on iPhone or Android.
What is the maximum PDF size I can compress?
Free accounts can upload files up to 25MB. Pro and Business accounts can upload up to 200MB.