Is this a character-by-character diff?
No. It compares lines at the same zero-based position and classifies each row as unchanged, added, removed, or changed. It does not calculate character-level edits within a line.
Compare two blocks of text line by line directly in your browser.
Preparing the editor...
The guide and instructions on this page are available while the tool loads.
It is useful for reviewing edits, checking configuration changes, comparing logs, and understanding content differences quickly.
Everything runs locally in the browser, which makes it fast and privacy-friendly for everyday development and editing workflows.
Typical tasks this tool is built for.
Text comparison runs locally in your browser. Neither panel is uploaded for diffing.
Practical tips before you download or share the output.
This tool compares line by line. For very advanced character-level diffing, a more specialized algorithm can be added later.
Longer reads that pair well with this tool.
Developer guide
Fourteen In-browser developer utilities for JSON, encoding, tokens, diffs, hashes, regex, SQL, UUIDs, and timestamps — fast checks without installing anything.
Developer guide
Use automatic JSON.parse and JSON.stringify formatting, inspect strict-JSON parser errors, and review indented text up to 1,000,000 characters.
Writing guide
Word Counter and Text Diff for drafts — count length, compare revisions, and publish cleaner copy with two In-browser DevToolKit tools.
Common next steps after using this tool.
Automatically format and validate JSON in your browser.
Create QR codes for URLs, plain text, email, phone numbers, and Wi-Fi credentials in your browser.
Generate strong random passwords directly in your browser.
Encode and decode Base64 text directly in your browser.
Format or minify SQL queries directly in your browser.
Decode JSON Web Tokens directly in your browser.
Situations where this workflow saves time.
No. It compares lines at the same zero-based position and classifies each row as unchanged, added, removed, or changed. It does not calculate character-level edits within a line.
No. A new line on one side shifts subsequent positions, so later equal-looking lines can be classified as changed rather than being matched as an insertion-aware diff would do.
The comparison replaces CRLF with LF before splitting lines. That line-ending pair alone should not create a difference.
Trailing spaces, lone carriage returns, and other invisible Unicode characters remain in the text and can make a positional row different even when it looks similar on screen.
Side by side shows the original and changed text in parallel numbered rows. Unified shows only non-unchanged rows, using plus, minus, or paired changed-line presentation.
The summary counts original lines, changed-text lines, and rows classified as added, removed, changed, or unchanged by the positional comparison.
Swap exchanges the current input text fields and clears any input error. It does not replace the stored comparison until you select Compare text again.
Yes. Load example fills both inputs with the component’s built-in example and immediately stores it as the current comparison. The sidebar also offers its available examples.
No. The component has no clipboard or download control for either input panel or for the comparison result.
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