Text Diff Checker

Compare two text blocks to find exactly what changed (additions, deletions, modifications).

100% Local

Original Text

Modified Text

What is Text Diff Checker?

This diff checker compares two blocks of text and highlights exactly what's different between them, line by line or word by word. It's a staple for developers comparing code revisions, writers checking what changed between draft versions, and anyone who just needs to compare two texts online quickly without manually scanning both.

How It Works

The tool runs a comparison algorithm across both text inputs, identifying which lines or segments were added, removed, or changed between the two versions, then visually marks each difference, typically with color highlighting, so changes are easy to spot at a glance.

Is It Safe to Use?

Both texts you compare are processed entirely within your browser, so sensitive content like contract drafts, source code, or private correspondence is never sent to or stored on a server.

How to Use Text Diff Checker (Step-by-Step Guide)

Paste your original text into the first box.
Paste the revised or second version into the second box.
Click compare to run the diff.
Review the highlighted additions, removals, and changes.
Copy or note the differences you need to act on.

Frequently Asked Questions

Can this file diff checker compare entire documents, not just short snippets?

Yes, it's built to handle longer documents and files, not just single sentences, highlighting differences throughout the full comparison.

Does it show differences line by line or word by word?

Most text compare tools show both levels of detail, first flagging which lines changed and then highlighting the specific words or characters that differ within those lines.

Can I use this to compare two texts online for a code review?

Yes, comparing two versions of code or configuration files is one of the most common uses for a diff tool like this.

Can I use this on mobile?

Yes, it works on mobile browsers, though comparing longer documents is generally easier on a larger screen.

Is there a limit on how much text I can compare at once?

It can typically handle fairly large documents, though very large files may take a bit longer to process.

Does it ignore whitespace differences, or flag those too?

Many diff tools let you choose whether whitespace-only changes should be flagged or ignored, which is useful when formatting shouldn't count as a real difference.

Can this text difference checker help me track changes in an essay revision?

Yes, writers often use diff tools exactly this way, to quickly see what was added, removed, or reworded between drafts.

Is this tool free to use?

Yes, there's no cost or sign-up required to compare text.

Report an issue with this tool