A PDF that's slightly above an upload limit doesn't need to be reduced to the smallest possible file. It needs to fit the limit while staying readable and keeping the features your recipient needs.
Start with a copy. Our PDF compressor can help with image-heavy documents, but its export method matters if your PDF contains selectable text, forms or a digital signature.
Check what's making the file large
Scanned pages and large photographs often account for much of a PDF's size. A mostly text document may already be compact.
Look for duplicate or unnecessary pages first. Remove them only if they aren't part of what the recipient requires. Then check the actual upload limit so you have a clear target.
Know what this compressor changes
The tool renders each page and puts a compressed image of it into a new PDF. That can work well for scans. It can also replace selectable text with pixels and remove working links, form fields, bookmarks and accessibility information.
A certificate-backed digital signature from the original won't remain valid on that rebuilt document. If you need to preserve those features, use a PDF optimization workflow that retains them and check its output.
Compress once, then inspect
- Open a working copy in the compressor.
- Start with medium quality and a suitable resolution.
- Compress and compare the original and output sizes.
- Download the result and open it in a PDF viewer.
- Check the page count, orientation and small details.
- Try stronger settings only if you still need a smaller file.
For a 5 MB upload limit, a readable 4 MB result may be enough. Further compression can make the file harder to use without helping the submission.
Read more than the first page
Check fine print, pale handwriting, barcodes and diagrams. Test text selection and search if you need them. Looking at the preview alone won't tell you whether those features survived.
Sometimes the result is larger. Replacing compact text with page images can add bytes, so keep the original when the new file offers no benefit.
Finish editing before signing
Where your process allows it, arrange and compress pages before adding the final signature. Our PDF signing tool adds a visible signature mark; it doesn't provide a signing certificate or verify identity. Check what the recipient accepts.
The compressor processes the document in your browser, while the page still downloads libraries and other site resources. Large files can strain a phone or an older laptop. If the tab becomes unresponsive, stop and try a smaller working copy rather than repeatedly submitting the same file.