Text Compare

What is Text Compare?

Text Compare is an online diff tool that highlights differences between two text blocks with precision and flexibility. You can compare at line, word, or character level depending on your needs. The tool offers inline view, where changes appear in a single flow with deletions shown as strikethrough and additions underlined, or side-by-side view, where the original text appears on the left and the modified text on the right for easy parallel reading. Options include ignore case (treat uppercase and lowercase as identical), ignore whitespace (collapse spaces and newlines), and trim lines (remove leading and trailing spaces from each line) to normalize input before comparison. A swap button exchanges the two texts, useful when you paste them in the wrong order. Statistics show additions, deletions, unchanged items, similarity percent, plus line, word, and character counts for each input. Writers, developers, and editors frequently need to spot changes between drafts, versions, or copies. Manually scanning long texts is slow and error-prone. Text Compare runs entirely in the browser; no files leave your device and no data is stored on any server.

Line-level diff treats each line as a unit. It is ideal for documents with one sentence or statement per line, logs, configuration files, or code. When comparing code, line-level diff shows which lines changed without highlighting every character. Word-level diff compares word by word within lines, showing changes within sentences. It is better for prose, paragraphs, or when you need finer granularity than lines but not character-by-character. Character-level diff highlights every character difference. Use it for short strings, typo hunting, or when a single character change matters. Character diff can be noisy for long texts because small changes produce many highlighted segments. Choose the level that best matches your content type and your goal.

Inline view is compact and works well on narrow screens. All changes appear in one flow: you see the narrative of what was removed and what was added. Side-by-side view is easier when you need to read both versions in parallel, such as when reviewing a contract amendment or comparing two translations. Line numbers help you reference specific locations. The ignore options reduce noise when formatting differences do not matter. Ignore case makes "Hello" and "hello" identical, useful when comparing content where capitalization was changed for style. Ignore whitespace collapses spaces, tabs, and newlines, so "word word" and "word word" are treated the same. Trim lines removes leading and trailing spaces from each line, helpful when copy-pasting from different sources with inconsistent spacing.

Who Benefits from This Tool

Writers and editors compare draft versions to see what changed between revisions. Developers diff configuration files, code snippets, or configs to spot changes before deployment. Students compare their work to reference answers or model solutions. Translators check source text versus target translation to ensure completeness and accuracy. Legal and contract reviewers spot changes between document versions. Quality assurance staff verify that outputs match expected text. Researchers compare datasets or logs from different runs. Support staff compare customer messages to templates. Educators grade assignments against model answers. Anyone who receives revised documents and needs to see exactly what changed benefits from Text Compare. No account or installation is required.

Key features

Three Diff Levels

Line diff: Compare line by line. Best for multiline documents, logs, lists, and code. Word diff: Compare word by word within lines. Best for prose and sentences. Character diff: Compare character by character. Best for short strings and typo detection.

Two View Modes

Inline: Single flow with deleted text struck through and added text underlined. Compact and good for mobile. Side-by-side: Original on the left, modified on the right, with line numbers. Easier for parallel reading and long documents.

Comparison Options

Ignore case: Treat uppercase and lowercase as equal. Ignore whitespace: Collapse spaces and newlines before comparing. Trim lines: Remove leading and trailing spaces from each line. These reduce noise when format differences are irrelevant.

Swap and Statistics

Swap button exchanges the two text fields. Statistics panel: additions count, deletions count, unchanged count, similarity percent, plus line/word/character counts per input. Gives a quick overview of how much changed.

How to use

1. Paste or type the first text in the original field and the second in the modified field. You can paste from any source.
2. Choose diff level (line, word, or character) and view mode (inline or side-by-side). Enable ignore case, ignore whitespace, or trim lines if needed.
3. Click Compare. Review the highlighted output and the statistics panel.
4. Use Swap to exchange the two texts if you pasted them in the wrong order. Use Sample to load example data. Reset clears everything for a fresh comparison.

Common use cases

• Comparing contract or document revisions to see exactly what changed
• Checking code or configuration file changes before commit or deployment
• Reviewing translations against source text for completeness
• Grading student answers against model solutions
• Verifying that generated text matches a template or expected output
• Finding typos or small edits in short strings or identifiers
• Comparing logs or outputs from different runs or environments
• Spotting changes in legal agreements or terms of service
• Diffing JSON, XML, or other structured text
• Auditing changes in policy documents or procedures

Tips & best practices

Use line level for structured text where one idea or statement per line (e.g. config files, logs). Use word level for paragraphs and prose. Use character level sparingly; it can be very noisy for long text. Enable ignore case when capitalization does not matter (e.g. comparing content where only style changed). Enable ignore whitespace when formatting changes (spaces, line breaks) are irrelevant. Trim lines helps when copy-pasting from different sources with inconsistent spacing. For side-by-side view, ensure your screen is wide enough to read both columns comfortably. For very long texts, consider splitting into sections. The Swap button is useful when results look inverted or when you realize you pasted original and modified in the wrong fields. Sample loads example data so you can see how the tool works before pasting your own.

Limitations & notes

Large inputs (hundreds of thousands of characters) may slow the browser. The tool uses a longest-common-subsequence algorithm; for very large inputs, performance may vary. There is no file upload: you must paste text. Encoding is assumed UTF-8. Binary or non-text content (e.g. images, PDFs) is not supported. The tool compares plain text only. For binary file comparison, use a dedicated binary diff tool. Results are not saved; refreshing the page clears your input. Use copy-paste to save results if needed.

FAQs