How to make a PDF smaller for email or a form

Open Compress PDF

Most upload forms set a limit, often 2 MB or 5 MB, and email services stop at around 20 to 25 MB. If your PDF is over, the fix is usually quick, because the size nearly always comes from the pictures inside it.

Why your PDF is so big

Text takes very little room. A 20-page report with no pictures is often well under 1 MB. Pictures are what add up: a scanned page is one large picture, and so is every phone photo of a document. Ten scanned pages can easily reach 20 MB.

So before you start, ask what’s in the file. A scan or a document full of photos will often shrink by half or more. A PDF that’s mostly text is already small and won’t change much, however strong the setting.

Get it under a limit

Open Compress PDF and add your file.
Choose Size limit and type the number the form gives you, such as 2 MB.
Press the button to compress. The tool tries stronger settings until the file fits, and keeps the best quality that does.
Download the result and open it. Zoom in on any small print, signatures or stamps to check they’re still clear.

If you don’t have a limit to meet, keep the level on Recommended. Print quality keeps more detail for a file you’ll print, and Smallest saves the most.

What changes in the file

Only the pictures are made smaller. Text stays as text, so you can still select it and search it, and links, bookmarks and form fields are left as they were. A scanned page has no real text to begin with, so compressing it won’t make it searchable. OCR PDF does that.

When it still won’t fit

Sometimes even the smallest setting is too big. The tool tells you, and offers that smallest version. You still have a few ways through:

Send it in parts. If the form allows several uploads, Split PDF can cut the file into smaller PDFs.
Drop the pages nobody needs. Blank pages and extra scans add size. Organize PDF lets you remove them.
Scan again at a lower setting. For plain documents, 150 to 200 DPI is usually enough to read. A 600 DPI scan is far bigger and rarely looks better on screen.

A file that’s too blurry after compressing

Go back to your original and use a higher size limit, if the form allows it. Compressing a file that’s already been compressed makes it worse, so always start from the original. Compressed copies are saved as new files, so the original on your device stays as it was.

Several PDFs at once

You can add several files together. Each gets the same setting, and the ones that got smaller come back in one ZIP.