Common problems
- PDF didn't shrink much — usually means it's already optimized text or scanned imagery.
- Need it under 5 MB for an ATS — split out unneeded pages first.
PDF editing
How to Compress a PDF Online Free
By MyPDFKitty Editorial Team · Updated 2026-02-01
Quick answer
To compress a PDF online for free, open MyPDFKitty's Compress PDF tool, upload your file, and click Compress PDF. We re-save it with optimized streams and show you both the original and new size so you can decide whether to use the result. Free for files up to 10 MB.
Step-by-step
- Step 1
Open Compress PDF
Go to MyPDFKitty's free Compress PDF tool.
- Step 2
Upload your PDF
Drop or browse to select your file.
- Step 3
Compress
Click Compress PDF and wait a few seconds.
- Step 4
Download
We show original vs new size; download the smaller version.
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Business documents
How to Compress a PDF for Email
Shrink PDFs to fit Gmail and Outlook attachment limits using MyPDFKitty.
FAQ
Is there a watermark?+
No. Free downloads are clean.
What's the file size limit?+
10 MB on Free, 100 MB on Pro, 500 MB on Business.
Try it now
To compress a PDF online for free, open MyPDFKitty's Compress PDF tool, upload your file, and click Compress PDF.