Find and Replace

Because this application runs entirely within your computer’s browser memory (Client-side Javascript), it can handle exceptionally large documents (tens of thousands of words) almost instantly without slowing down or requiring a server upload.

If Case Sensitive is checked, searching for “Apple” will only find exactly “Apple” with a capital A. If it is unchecked, searching for “Apple” will also find “apple”, “APPLE”, and “aPpLe”.

Regular Expressions (Regex) allow developers to search for complex patterns instead of exact words. For example, finding d{4} will locate any 4-digit number (like a year) throughout the entire document and replace them all in one click.

Absolutely! All find and replace operations happen 100% client-side in your browser using JavaScript. Your text never leaves your device, is never uploaded to any server, and is not stored anywhere. The tool works completely offline after the page loads.

While there’s no undo button, your original text remains in the top input box unchanged. If you need to start over, simply click “Clear All” or reload the page to reset everything.

If the pattern you’re searching for isn’t found in your text, the result will be identical to your input, and the replacement counter will show “0 replacements made”. An info toast also flashes “No matches found” so you don’t think the button failed silently.

Yes! Leave the “Replace with” field empty to effectively delete all instances of the found text. This is useful for removing unwanted characters, words, or patterns from your document. The character-delta in the stats line shows how many characters were removed.

It’s after_length − before_length in characters. Positive means the text grew (e.g. replaced “cat” with “kitten” – +3 per replacement). Negative means it shrunk. Zero means equal-length substitution. Quick sanity check that the result is what you expected.

The actual engine error gets surfaced – the stats line turns red with the exact message (“Unterminated character class”, “Invalid escape”, whatever). Fix the regex and click Replace All again. Your input text is preserved.