What is the difference between line diff and word diff?

Line diff marks an entire line as changed if any part of it differs. Word diff goes further and highlights the exact words within a changed line that are different. Use line diff for code comparison where the line is the logical unit; use word diff for prose where you want to see precise wording changes.

Can I use this to compare code files?

Yes. The text diff tool works on any plain text, including source code. Paste two versions of a function or configuration file to see exactly what changed. For full file diff workflows, tools like git diff are more powerful, but for quick ad-hoc comparisons this browser-based tool requires no setup.

Does the tool handle whitespace and line endings?

You can toggle whitespace sensitivity. With whitespace-insensitive mode on, differences in indentation or trailing spaces are ignored and only meaningful content changes are highlighted — useful for comparing code that was reformatted.

Is there a text size limit?

The tool processes text in your browser and handles documents of tens of thousands of lines without issue on modern devices. For very large files (megabytes of text), a desktop diff tool like VS Code or diff utility may perform better.

How to Compare Two Texts Online

Find differences between two blocks of text instantly with our free Text Diff tool. Highlights additions, deletions, and changes side by side.

Steps

Paste the original text

In the left panel, paste the original or older version of your text. This is the baseline the tool compares against. It can be anything: a document draft, a code snippet, a configuration file, or a paragraph.

Paste the modified text

In the right panel, paste the updated or newer version. The tool will identify every line and word that differs between the two versions.

Choose your diff mode

Select line-by-line diff to see which whole lines changed, or word-by-word diff for a finer-grained view that highlights individual word changes within each line. Word-level diff is especially useful for catching small edits like a number change or a single word substitution.

Review the highlighted differences

Additions appear in green and deletions in red. Changed lines are shown with the old version struck through next to the new version. Scroll through both panels together to review every change in context.

Copy or export the diff

Copy the diff summary to your clipboard for sharing in a pull request comment, bug report, or document review. You can also download the unified diff as a .diff or .patch file.

When to Use a Text Diff Tool

Text comparison comes up in more situations than most people expect. Writers use it to track revisions between drafts and to verify that an editor's changes match what was agreed. Developers use it to compare configuration files, check what changed between two API responses, or verify that a refactor did not accidentally alter output. Translators use it to identify which source paragraphs changed between version 1.0 and 1.1 of a document so they know what needs re-translating. Support teams use it to compare customer-submitted logs against known-good templates. In every scenario, the diff tool collapses a tedious manual search into a glance.

Understanding Diff Output: Additions, Deletions, and Context

A diff presents changes in a structured way. Lines that appear only in the original are marked as deletions (typically in red). Lines that appear only in the modified version are marked as additions (typically in green). Lines that are identical in both versions are shown as context — they help you understand where in the document a change occurred without cluttering the view. Most diff tools show a few lines of context around each change by default. The unified diff format, used in patch files and git commits, represents the same information in a single-column view with + and - prefixes for easy sharing and applying changes programmatically.

Text Diff vs Version Control: Choosing the Right Tool

For ongoing software projects, version control systems like Git are the right solution for tracking changes over time. But there are many situations where you have two pieces of text and you just need to know what is different right now — no repository, no commit history, no setup required. A browser-based text diff tool fills this gap perfectly. It is also useful for comparing text that does not belong in a code repository at all: contract clauses, policy documents, translated content, or customer data extracts. Use the diff tool for quick, one-off comparisons and reach for Git or a dedicated code review platform when you need a complete audit trail.