How do I get more InMail credits?

Credits come with Premium, Sales Navigator, or Recruiter, on a monthly pile that can roll over up to a cap. Sales Navigator Core is commonly 50 a month. Premium Business is smaller. Check the plan you actually pay for.

The only regular way to stretch the pile is replies. If they respond inside LinkedIn's window (often about 90 days), the credit can come back. That is an argument for writing InMails people answer, not for sending more junk.

Some plans let you purchase extra credits. LinkedIn's own checkout is the path. Random sites selling "InMail packs" attached to someone else's seat are a good way to lose the account.

You cannot convert unused invites into InMail. You cannot farm Open Profile and call it credits. You cannot get a restriction lifted by buying more InMail.

If you are out of credits every week, the problem is targeting, not the allotment. Put most outbound on invites and DMs. Save InMail for names that are worth a dollar figure you can feel. See do credits come back.