Shrink the PDF, keep the text.
Upload a PDF and pick a quality preset; images are re-compressed while the text layer stays as it is.
Frequently asked questions
Does the text stay selectable after compression?
Yes. The saving comes from re-encoding images; the text layer is not touched, so you can still copy text out of the result.
Which compression level should I choose?
There are three: low loses the least quality, high gives the smallest file. Image-heavy documents shrink a lot; mostly-text documents have less to gain.