Compress PDF online — free
Optimize PDF structure and check the measured file size
No sign-up required. Drop your files and download in seconds.
Upload a PDF or image and try structural optimization. File-size reduction varies.
Choose files or drag them here
Photos up to 100 MB · other files up to 25 MB · ⌘V / Ctrl+V
Balanced and strong modes can reduce JPEG image quality and resolution while keeping PDF text and vector graphics. Other image formats may not shrink. Signed PDFs remain unchanged. The output will not be larger than your original.
What is Compress PDF?
Compress PDF optimizes PDF structure and can reduce large embedded JPEG photos while retaining selectable text and vector graphics. Balanced or strong mode may lower photo quality. Unsupported images and signed PDFs remain unchanged; the output is never larger than the original.
How to compress pdf online
- 1
Upload your PDF.
- 2
Choose balanced JPEG optimization or strong reduction for photo-heavy PDFs. Select preserve-image-quality mode if needed.
- 3
Compare the measured output size, download and inspect the result.
Frequently asked questions
How much smaller will my PDF get?
Reduction depends on the PDF. Large embedded JPEG photos can shrink, while other image formats or already optimized files may not. Signed PDFs are left unchanged. If the output is still too large, split pages or share a link.
Which optimization mode should I use?
Balanced and strong modes recompress eligible JPEG photos; strong also reduces image resolution further. Preserve-image-quality mode only rewrites PDF structure. Embedded vector text is retained, but inspect photos after compression.
Do I need to sign in?
No — compress and download immediately for free.
Prefer instructions? Follow a step-by-step PDF guide.
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Beyond the conversion
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