Compress PDF
Reduce PDF file size by recompressing images, keep it easy to share.
Drop a PDF here
or click to browse
Make your PDFs smaller and easier to email or upload with PDFOtter's free PDF compressor. It shrinks bulky, image-heavy PDFs by re-optimizing them, so you can meet upload limits and share faster, while keeping your document readable. No uploads, no watermark, no cost.
How to compress pdf online
- Upload a PDF. Drop your file above or click to browse.
- Pick a compression level. Light, Recommended or Strong, depending on how small you need it.
- Compress. PDFOtter optimizes the file and shows you how much space you saved.
- Download. Grab your smaller PDF, ready to share.
Why use PDFOtter's Compress PDF?
- Three compression levels
- See your size savings instantly
- Great for email limits and web uploads
- Runs in-browser, always private
Compress PDF, frequently asked questions
How do I reduce PDF file size for free?
Upload your PDF, choose a compression level and click Compress PDF. PDFOtter shrinks it and shows the new size, free and private.
Which compression level should I choose?
Start with "Recommended" for a good balance. Use "Strong" for the smallest file, or "Light" to preserve maximum quality.
Why did my PDF not get smaller?
PDFs that are mostly plain text are already tiny. Compression helps most on scanned or image-heavy documents.
Is my file uploaded to compress it?
No. Compression happens on your device, so your document is never sent anywhere.