Does my data get uploaded anywhere?
No. Everything runs locally in your browser and nothing is sent to a server.
Is this free to use?
Yes. It is completely free, with no account, no signup, and no usage limits.
Does it work on a phone?
Yes. The page runs in any modern mobile browser, on iPhone and Android alike, with no app to install.
Can I start the numbering at something other than 1?
No, it always starts at 1. If you need to continue an existing list, number the new items here and then adjust the numbers in your editor, or paste the whole combined list in one go so the sequence is generated as a single run.
Can I use "1)" instead of "1." ?
Not directly. Number the list here, then use find and replace in your editor to swap the period after the digit for whatever character you want.
Can I get zero-padded numbers like 01, 02?
No, the numbers are plain integers. If you need padding for filenames or for correct alphabetical sorting, add the leading zeros afterwards, or sort with Text Sorter which is number-aware and does not need padding.
Does it keep my indentation for sub-items?
No. Every line is trimmed, so a nested list comes out flat with each sub-item numbered as though it were a top-level item.
Can I paste the result into Markdown?
Yes. "1. " is exactly the Markdown ordered-list syntax, so the output renders as a proper numbered list. Markdown renumbers automatically when it renders, so the visible order will be correct even if you later reorder the lines.