How to compress a PDF below 1 MB
By PDFEditor.ae · Published
Measure first
Note the current size and how far over 1 MB it is. Then look at what the PDF contains: a text document exported from Word behaves very differently from a stack of phone photos or scans.
Step 1: Lossless compression
Compress PDF re-saves the file more compactly without changing text or image quality, and shows the size before and after. It has no "stronger" setting that trades quality for size. In our own test, a text-heavy report shrank by 59%, while a PDF of photos did not shrink at all.
- Open Compress PDF and upload the file.
- Compress and note the new size.
- If it is under 1 MB, open it to confirm it looks the same — you are done.
Step 2: If photos or scans make it large
Make the images smaller before they go into the PDF. Resize photos to around 1,500–2,000 pixels wide, or rescan at a lower resolution, then rebuild the PDF with JPG to PDF. Check the result and repeat with slightly smaller images only if you need to.
Step 3: Remove what is not required
Blank pages, cover sheets and duplicate pages all cost space. Delete them from a copy.
A mistake to avoid
A file under 1 MB is no use if stamps, signatures or small print become unreadable. Zoom to 100% on the page with the smallest text before uploading. If you cannot get under the limit clearly, ask whether the system accepts several files.
Why is it still above 1 MB?
Usually because most of the size is images, which lossless compression leaves unchanged. Shrink the images themselves, as in step 2.