Online String Replacer and List Compare Tool
Replace values across text or compare line-based lists to find differences and common items instantly in your browser. It helps migration work, release reviews, and data cleanup where repeated text changes or line-based set differences would be tedious by hand.
What is a string replacer and list comparer?
A bulk string replacer applies one change consistently across a block of text. A list comparer treats each line as an item and groups entries unique to either list or shared by both.
How to use these text tools
Choose String Replacer to enter a search value and replacement, optionally as a regular expression. Choose List Compare to paste one item per line into each list and inspect the three result groups.
Keep sensitive text local
Both workflows run in the browser, which is useful for comparing configuration names, migration lists, and code snippets without sending them to an online processing service.
How to use String Replacer / List Compare for related tasks
Use plain text for predictable replacements, regex for patterns, or paste two lists to inspect entries unique to each side and common to both.
Related tools: Text Compare, Case Converter.
Frequently asked questions
Is replacement case-sensitive?
Plain-text replacement is case-sensitive by default. Regex mode lets you add flags such as i for case-insensitive matching and g for every occurrence.
How are lists compared?
Each trimmed non-empty line becomes an item. The results show items unique to each list and the intersection shared by both.
Is my text sent anywhere?
No. Replacement and list comparison run locally with JavaScript and are not uploaded or stored.
How do I compare two lists and find missing items?
Paste one item per line into List Compare; it reports only-in-A, only-in-B, and common values after trimming empty lines.