What happens if I ask for a million repeats?
The count is clamped to 100,000. That is not an arbitrary limit: the whole result is built as a single string in memory and rendered into a textarea, and a million copies of even a short line is enough to make the tab unresponsive on a modest machine. If you genuinely need more, generate 100,000 and paste it several times.
Can I make each copy slightly different, for example numbered inside the text?
No. The only variation available is the optional "1. " style prefix on each repetition. There are no template placeholders, so you cannot substitute a counter or a random value into the middle of the text. For that you want a spreadsheet fill or a two-line script.
Why is there a space after my commas?
The comma preset is defined as ", " because that is what most people want when they are building a human-readable list. If you need a bare comma with no space, choose Custom and type a single comma into the custom separator field.
Does the trim option affect the separator too?
No. Trim strips leading and trailing whitespace from the text you are repeating, once, before the copies are made. The separator is inserted exactly as you specified it, including any spaces you typed into the custom field.
What are the character and line counts under the output for?
They are a sanity check on what you actually produced, computed live from the output string. The line count is the number of newline-separated segments, so if you chose the space separator the count will be 1 no matter how many repeats you asked for. It is the quickest way to notice you have generated far more text than you intended before you paste it somewhere.