You paste the same paragraph into two word counters and get two different totals. Before you assume one is broken, look for the terms each tool is counting: punctuation, hyphenated phrases, and numbers can be handled differently. A count is most useful when you know the rule behind it.
Words Need a Counting Rule
A basic counter often treats a word as a group of characters separated by spaces. Under that approach, “well-known” may count as one word, and “don't” may also count as one. Another tool might split a hyphenated phrase or process punctuation differently, so the same text can produce a different total.
Check the Text You Pasted
For a fair comparison, copy the exact same text into both counters. Check that you did not include a title in one count but not the other, and watch for extra spaces or line breaks copied from a document. Then inspect any hyphenated terms, contractions, symbols, and standalone numbers.
Use the Required Tool
If an assignment, application, or publishing platform gives you its own counter, use that result for the final check. Its counting rules are the ones that matter for that submission. When no specific tool is required, choose one counter and use it consistently rather than trying to reconcile every small difference.
Check More Than the Total
A word count can tell you whether a draft is inside a limit, but it cannot tell you whether the writing is clear. If you are near a maximum, leave room for a title or other text that may be included in the final submission. After checking the number, read the text once for meaning and once for any missing or duplicated words.