What is Text Diff Checker?

Text Diff Checker compares original and revised text side by side, then highlights what was added and removed. It works well for code changes, document revisions, configuration checks, and line-by-line editing.

In default mode, you can paste both versions and compare them in one step. In real-time mode, you can watch the diff change as you type. The tool also shows added lines, deleted lines, change blocks, and total line counts, which helps when you want a quick sense of how much changed.

Everything runs in the browser, so you can review the content locally while comparing it.

How to Use Text Diff Checker

1. Choose a comparison mode.
2. Enter or paste the original and modified text.
3. In default mode, click Compare to show the diff.
4. In real-time mode, the result updates as your input changes.
5. Review the diff and the stats, then adjust the display options if needed.

Main Settings

Comparison Mode

• Default: best when both versions are already prepared and you want to compare them in a deliberate, one-shot review. It works well for code snippets and configuration files.
• Real-time: useful when you are rewriting copy, notes, or prompts and want to see what changed as you edit.

Display Options

Display options help you tune the diff view for the kind of text you are reviewing.

• Line numbers: helpful when you want to match the diff with review comments or specific line references.
• Gutter: useful for quickly spotting where additions and deletions are concentrated.
• Highlighted changes: helps when you want to track the exact words that changed inside a line.
• Line wrapping: makes long paragraphs, URLs, or code lines easier to review without horizontal scrolling.

What You Can Review

Along with the visual diff, the result area shows stats that help you understand the scale of the change.

• Added lines: how many new lines were introduced
• Deleted lines: how many lines were removed
• Change blocks: how many separate sections were edited
• Total lines in the original and modified text: how much the overall length changed

If there are no differences, the result area shows that as well.

Use Cases

• Checking the scope of function, style, or markup edits before opening a pull request
• Reviewing rewrites in articles, meeting notes, or proposal drafts to see what wording changed
• Comparing JSON, YAML, or other settings where a small text change can affect behavior
• Measuring how much a draft was tightened or reorganized while editing

Things to Keep in Mind

• In default mode, the result does not change until you click Compare again
• In real-time mode, even in-progress edits are reflected in the diff immediately
• Processing stays in the browser, but it is still worth double-checking sensitive content before sharing it elsewhere