How to compress a PDF without losing useful quality

Why PDFs get large

A PDF's size is almost always driven by the images inside it, not the text. A ten-page text document is often well under 1 MB, while the same ten pages scanned on a phone can easily be 20 MB or more, because every page is a high-resolution photo.

That means the most effective way to shrink a PDF is to store those page images at a more sensible resolution and quality. That is exactly what Compress PDF does.

Choosing a compression level

Recommended is the right starting point for email, online forms and portals. Pages remain comfortably readable on screen and when printed at normal size.

Choose High quality when the document will be printed or contains fine detail such as small print, diagrams or signatures you need to stay crisp. The file will be larger.

Choose Smallest size only when you are fighting a strict upload limit. Text stays legible, but photos and fine lines will look visibly softer.

An important trade-off: selectable text

MyGuyAI compresses by re-drawing every page as an image. The result looks the same, but text in the compressed file can no longer be selected, searched or copied, and links and fillable form fields are removed.

For scanned documents this makes no difference — their text was never selectable. For a digitally created PDF where searchable text matters, keep the original and send it as-is, or remove unneeded pages with Split PDF instead of compressing.

When compression can't help

Some PDFs are already efficient. If re-encoding wouldn't make the file smaller, MyGuyAI hands back your original with a note rather than a bigger file.

In that case the practical options are to remove pages the recipient doesn't need, or to split the document into parts.