Compress PDF Online - Reduce PDF File Size
Reduce PDF file size for easy email sharing and portal uploads while maintaining clear readability.
How to use Compress PDF in 3 simple steps
Upload Document
Select the large PDF file you want to compress from your local storage.
Choose Your Target
Enter an exact maximum size in KB, pick a common portal limit, or switch to the quality and DPI slider for manual control.
Download Compressed File
Inspect the reduced file size and download your optimized PDF document instantly.
Something not working?
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Smart In-Browser PDF Compression
Many government portals, email clients, and employment application forms enforce strict file size caps such as 2MB or 5MB. Trying to email a 30MB scanned document frequently leads to delivery bounce-backs and rejected submissions.
Toolnova Compress PDF renders document pages using client-side rendering engines and re-encodes embedded photographic elements using optimized JPEG compression levels. This substantially reduces the megabyte footprint while preserving high-contrast text readability.
Because the compression algorithms operate right within your browser execution thread, you get real-time feedback comparing initial and final file sizes without waiting for file uploads or cloud queue processing.
Key features & capabilities
Frequently asked questions about Compress PDF
Common questions about usage, privacy, limits, and browser compatibility.
Will compressing a PDF reduce its quality?
Compression rebuilds each page as a JPEG image, so some sharpness is lost, especially in fine print and thin lines. At the balanced 150 DPI setting and moderate quality, most documents remain clearly readable on screen and in print. Lower quality or DPI settings shrink the file further but soften detail.
What is the maximum file size I can compress?
The compressor is designed for PDFs up to 100 MB. Files near that size can still fail on phones or older computers because rendering every page needs free memory. If a large file will not finish, close other tabs and try again.
Are my PDFs uploaded when I compress them?
Nothing is uploaded: the file is read into your browser, rendered there, and rebuilt into a new PDF on your device. Nothing is sent to Toolnova's servers, and there is no account or stored copy. Closing the tab clears the document from memory.
Can I compress a PDF to an exact size, such as under 200 KB?
Target-size mode lets you enter a maximum in kilobytes or pick a common portal limit such as 200 KB or 2 MB. The tool then steps down image quality and resolution until the output fits, and reports the final size before you download. If the target is impossible, it shows the smallest result it could reach instead of pretending to succeed.
Why is my compressed PDF not smaller than the original?
PDFs that are mostly vector text or already optimized images have little spare data to remove. In that case the rebuilt file can be larger, so the tool offers the original unchanged rather than inflating it. Try grayscale mode or a lower DPI setting if the document contains scans.
Can I compress a scanned PDF?
Scanned documents are the best candidates because each page is a large image that can be downsampled significantly. The output stays readable at normal viewing size, though small text may blur at aggressive settings. There is no OCR, so the compressed scan will not become searchable text.