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How to reduce PDF file size for an upload or email
Practical ways to make a PDF smaller with Preview, Acrobat or your original file, plus checks for 1 MB and 100 KB upload limits.
Capri Video · Updated · 3 min read
A PDF that misses an upload limit by a few kilobytes needs a different approach from a 40 MB scan. Start with the receiving website's size limit and the actual size of your file. Keep the original, then work on a copy. CapriVideo does not currently offer a PDF compressor; the methods below use your existing document app or dedicated compression software.
Start with the original document
If you still have the presentation, report or design file, check its PDF export settings before compressing the finished PDF. A document intended for screen reading may not need the same image detail as a print brochure. Make a second export using the source app's smaller-file or screen-quality option, if available, and compare it with your first export.
Keep selectable text as text when the source application supports it. Converting every page into a screenshot makes the document harder to search and creates a new image-quality problem. If a photograph is responsible for most of the file size, adjust that photograph in the source document instead of repeatedly processing the entire PDF.
Reduce a PDF on a Mac with Preview
Open the PDF in Preview. Use File → Export, select Reduce File Size from the Quartz Filter menu, and save under a new filename. Apple notes that the output can lose quality. See Apple's Preview instructions for the options available in your macOS version.
Try this on a copy of a scanned receipt. Compare the total and date in the original and exported versions at normal reading size. If the smaller version blurs those details, keep the original and try a less aggressive method.
Reduce a PDF in Adobe Acrobat
In Acrobat on Windows, use Menu → Save as Other → Reduced Size PDF; on macOS, start from File. Choose the required compatibility and save a separate copy. Adobe's current instructions describe this workflow. Availability depends on your installed Acrobat product.
When you need 1 MB or 100 KB
A target such as 1 MB is a requirement to check, not a result every document can reach. A hundred scanned pages may require substantial quality loss to fit the same limit as a one-page letter. Compare the exported file's size with the portal's stated maximum, then test the upload. Avoid aiming exactly at the boundary if the site rounds its displayed sizes.
If the application allows separate attachments, ask whether several clearly named files are acceptable. If it only needs specific pages, extract those pages into a PDF. This changes what you send; it does not compress the selected pages or securely redact confidential content. CapriVideo's extraction tool accepts supported standard PDFs and may reject documents with forms, signatures or shared page resources.
Check the smaller file before sending
Read the smallest text, inspect photographs, and confirm that every required page is present. Test any features the recipient needs, such as text selection or form fields, in the downloaded copy. Keep the version that meets both the upload limit and the reading requirements.
If your starting files are photographs, prepare their size before turning JPG or PNG images into a PDF. Wrapping large photos in a PDF does not guarantee a smaller attachment.