An online text comparison tool highlights exactly what changed between two versions of a document, code snippet, or data file - without needing Git, a code editor, or any desktop software. Paste two texts side by side and see differences line by line in seconds.
What is Text Comparison (Diff)?
A "diff" (short for difference) is a structured way to show what has been added, removed, or changed between two versions of text. Each line is compared against its counterpart, and any mismatch is flagged. This is the same technique used by version control systems like Git, code review platforms like GitHub, and document collaboration tools.
There are different levels of comparison:
- Line-level diff - each line is compared as a unit. A changed line appears as a removed old line and an added new line.
- Word-level diff - changes within a line are identified at the word boundary.
- Character-level diff - the most granular comparison, showing exactly which characters changed.
How to Use the Text Compare Tool
- Paste your original text - enter the first version of your text in the left panel. This is typically the older or baseline version.
- Paste the modified text - enter the second version in the right panel. This is the newer or edited version.
- Review the highlighted differences - differing lines are displayed side by side with added and removed content clearly indicated.
Common Use Cases
- Comparing two versions of a contract, policy document, or legal text
- Reviewing changes in configuration files before deploying
- Checking whether a copy-paste preserved the original text accurately
- Comparing translated texts to spot omissions or changes
- Diffing two sets of data exports to verify consistency
- Spotting unintended changes in AI-generated rewrites of content
Frequently Asked Questions
Is the comparison case-sensitive? By default, yes - "Hello" and "hello" are treated as different. Some diff tools offer a case-insensitive option to ignore capitalization when comparing.
Can I compare code files with this tool? Yes. The tool works with any plain text including source code, HTML, CSS, JSON, YAML, or any language. You can paste the contents of any text file.
Does it upload my text to a server? No. The comparison runs entirely in your browser using JavaScript. Your text is never sent anywhere and remains completely private.
What if the texts are very long? The tool handles long documents, but extremely large texts (thousands of lines) may take a second to process depending on your device's performance. For source code comparisons, a dedicated version control system is more appropriate for ongoing use.
Use the Text Compare tool free, no sign-up required.