Most tools shrink a PDF by a vague amount and leave you to check whether it is small enough. Portals do not work that way — they name a limit and refuse anything above it.
Compress a PDF →Free every day without an account on some tools. Your file is deleted the moment the job finishes.
Give the limit and it works towards that number, trying quality settings until the file fits, and it keeps the best quality that does. If your limit cannot be reached without making the document unreadable, it says so and gives you the smallest it managed, rather than handing back something that looks like a fax.
Say the size you need — 100 KB, 500 KB, 2 MB — and the file is compressed until it fits, or until it cannot go smaller without becoming unreadable, in which case it says so.
Yes. Text stays text; it is the images inside that are made smaller.
Yes, and no account is needed to try it.