What does a diff checker do?

A diff checker compares two pieces of text and highlights the lines or words that have been added, removed, or changed between them.

Is my text sent to a server?

No. All comparison runs entirely in your browser. Your text never leaves your device.

Can I compare code files?

Yes — paste any text including source code, configuration files, SQL queries, or plain text. The diff highlighting works on any text content.

Diff Checker — Compare Two Texts Online Free

Compare two text snippets side-by-side and highlight the differences instantly. Supports line-by-line and word-level diff. Free, runs in your browser — nothing uploaded.

Original text

Modified text

Ignore whitespace changesShow unchanged lines

Diff result

Click Compare text to see a highlighted diff of the two inputs.

How it works

1.Paste your original text in the left panel and the modified version on the right.
2.Click Compare text — differences are highlighted line by line.
3.Green lines were added, red lines were removed, grey lines are unchanged.
4.Use "Ignore whitespace" to skip tab/space-only changes.

Notes & limitations

—Diff is line-based — runs entirely in your browser, nothing is uploaded.
—Best suited for snippets, configs, log lines, and small files.
—For very large files or binary diffs, use a desktop tool or git diff.

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