Should I remove low performing keywords or just pause them?

If I were you ... I would start off by grouping your keywords into HighConverting (HC), LowConverting(LC) & No Converting(NC) ... then ...
Set HC ad group to Exact - To aim for Higher CTR & Lower the CPC
Set NC ad group to Broad - To collect more keywords & understand why they are not converting. Will delete / pause them if your confident enough, that they are not with of a spend.
Set LC as group to Exact - Play with demographics & CPC & other reports to understand why they are not converting well.

Jst my 2cents ...

I´m just pausing them. No need to remove them IMO.

Cheers,
Kiril

Most people avoid deleting anything in Adwords because you lose the history and data.

I wouldn't keep them. It's just no point it's still taking money even though performancing very low.

Hi tayyab123,

You don't do any of that which you see suggested above.

Instead, learn how to do the essential core function of managing an ongoing ad campaign which is bid management and optimization.

If a keyword is highly relevant there is almost never a reason to delete it. You don't delete it, you manage it.

If a keyword is triggering irrelevant search terms then you may want to add negative keywords to prevent those irrelevant terms from trigger ad impressions, or convert the keyword into a more precise match type variant.

Form Follows Function

First, make sure your account is structured properly, that all keywords are relevant, and organized into tightly focused ad group themes where every keyword in the ad group has an identical meaning and intent as every other keyword in that same ad group. Also make sure that the core message of each ad in the ad group precisely matches all the keywords with a great deal of specificity.

Search Terms, Not Keywords!

Next, forget about using keywords as a basis for optimizing your campaign performance. We don't optimize keywords, we optimize search terms, and ad messages. Keywords are just a tool, a mechanism for triggering specific ad messages for specific search terms. Search terms are what you need to focus on and optimize. Try to remember that a keyword is just a tool, and performance depends not on the tool, but how you use the tool.

Value Is What Matters

The objective of optimizing your search campaigns is to find the right search terms (not keywords), and matching message, that produces the greatest value. The rest is just bid management to get to the greatest total value based on volume, value, and cost.

Of course this is just a high level description of the core concept. The nuts and bolts of doing all this is much too much for a single forum post, this is just an over-simplified description of the core task of campaign performance optimization. You need to get the general ideal right, before diving into the specific methods and practices. Your post made it clear that you didn't have clarity of the core concept of what campaign management is suppose to be about.

HTH,

Don Burk

As per my knowledge do not delete it just pause them to keep the history intact.