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OPTIMIZE
Make a PDF smaller for email, forms and uploads. Choose lossless to keep full quality, or a smaller file when size matters most.
or choose one from your computer. It stays in this browser.It stays in this browser.
HOW TO
Drop it on this page, or choose it from your computer or from My files.Choose it from your phone or from My files.
Lossless keeps full quality. Smaller file shrinks it further. You see the estimated size before you start.Lossless keeps full quality. Smaller file shrinks it further. You see the estimated size first.
Check the new size, rename the file if you like, then download it or save it to a folder.Check the new size, then download it or save it to a folder.
SETTINGS
Rewrites the file more efficiently without touching what is on the page. Text stays selectable, and links and form fields keep working.Rewrites the file more efficiently without touching what is on the page. Text stays selectable.
Best forContracts, forms and text documents
Turns each page into an image at the detail and quality you pick. Files get much smaller, but text can no longer be selected or searched.Turns each page into an image. Files get much smaller, but text can no longer be selected or searched.
Best forScans and photo-heavy PDFs you only view or printScans and photo-heavy PDFs
FAQ
It depends on what is inside. Scans and image-heavy files shrink the most. StackPDF shows an estimate before you start and the real size when it is done.
Lossless keeps full quality. Smaller file turns each page into an image at the detail you pick, so it trades some sharpness for size.
With Lossless, yes. With Smaller file, no: each page becomes an image, so its text can’t be selected or searched.
There’s no set limit, because the work happens on your device. Very large files depend on your device’s memory.
No. Compression runs in your browser, so your PDF stays on your device.
No. Compress a PDF without signing up and the result downloads to your device. Premium removes the daily limit and adds My files.