Free, browser-based utilities rarely get much attention, but a tool like Remove Lines That Are Only Numbers solves a genuinely common problem quickly enough that it's worth keeping bookmarked.
No Login, No Install, No Waiting
A task like this doesn't need a full software installation or an account signup. It needs a fast, reliable pass over a list, which is exactly what a lightweight, browser-based tool provides directly on the page.
Built for Repetitive, High-Volume Tasks
Filtering a list by hand is manageable at a few dozen lines and genuinely painful at a few thousand, which is exactly where a purpose-built filter tool earns its keep.
Pairs Well With Other Tools in the Same Toolkit
Filtering tools work well chained together with sorting and deduplication tools from the same toolkit, narrowing a large raw export down to exactly what's needed in a few quick passes.
Next step: Try Remove Lines That Are Only Numbers directly on SeoWolf's Notepad — free, no login required, and ready to use the moment you need it.