HTMLNumber Formatter
Format numbers with commas, as currency (USD/EUR), as percentages, or in scientific notation. Processes all numbers in the input at once — paste a column of data and format everything in one click.
Ctrl+Enter to run | Ctrl+K to switch tools | Recent button shows input history
Repeating this work? Turn this kind of browser utility into an API batch, MCP prompt, extension workflow, or shared team recipe.
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Can it handle negative numbers?
Yes — negative numbers like -1234567 are formatted correctly: -1,234,567.
Does it handle decimal places?
Yes — the decimal portion is preserved as-is for most formats. Currency formats round to 2 decimal places.