Free Online Text Difference Checker
Text Difference Checker is a free online tool that compares two blocks of text side by side and highlights exactly what was added, removed, or changed between them.
Paste or upload two text files into the left and right editors to instantly see a line-by-line comparison.
Why use this Text Diff Checker?
- Compare any two pieces of text instantly in your browser.
- Highlight added, removed, and changed lines.
- Works with plain text, code, logs, CSV, or Markdown.
- Upload text files directly from your computer.
- Switch between side-by-side and inline diff views.
- Swap sides, copy, or download either document.
- Keep a history of recent comparisons.
- Process everything locally — nothing leaves your browser.
Common Questions
What is a Text Difference Checker?
A Text Difference Checker compares two pieces of text and shows which lines were added, removed, or modified between them.
How do I compare two text files?
Paste or upload the first document into the left editor and the second into the right editor. The differences are highlighted automatically as you type or edit either side.
Can I compare code or log files?
Yes. Any plain text works, including source code, configuration files, CSV data, and log output.
Does it show how many differences were found?
Yes. A status indicator shows the number of differing line blocks, or confirms the two documents are identical.
Is this Text Diff Checker free?
Yes. This Text Difference Checker is free to use online and compares your text directly in your browser.