Copied HTML can include navigation, styling and scripts around the sentence you need. Removing those elements can produce a useful text draft, but it does not reconstruct the page exactly as a browser would display it.
HTML to Plain Text performs an approximate text extraction. It removes selected noncontent blocks and tags, then returns text for review.
Start with a short fragment
A snippet containing <p>Lahore</p><p>Karachi</p> gives the two city names with a separation appropriate to those block elements. A script block around an alert is excluded rather than executed.
The extraction also removes style, template and noscript content according to the implementation. This helps with common copied fragments, but it is not a complete browser DOM or layout engine.
Whitespace in the result can differ from the spacing on the original page. Links lose their markup, and visual meaning carried only by styling may not survive at all.
Review before publishing the text
An HTML table, image caption or navigation menu can become a sequence of words that needs editing. Check the order against the source instead of assuming that all important context has been preserved.
The tool does not download a webpage. Paste the fragment you are authorised to use, within the small input limit. It cannot retrieve content hidden behind a login or assembled later by page scripts.
This is also not an HTML security sanitiser. A plain text result is useful for reading, but the extraction should not be used as a policy for deciding which markup is safe to render in an application.
Use the output as a starting draft for your own review. For repeated extraction from complex pages, a proper parser with explicit content selectors is more dependable than a general tag removal operation.