What is the Text Diff Checker?

The Text Diff Checker compares two pieces of text and shows exactly what changed between them — words added, words removed, and lines modified — with color-coded highlighting. Paste an original and a revised version, and the tool produces a visual diff you can read at a glance.

It works on any text: prose documents, code snippets, configuration files, legal text, email drafts, or anything else where you need to understand what changed between two versions.

---

How to Use the Text Diff Checker

1. Paste your original text in the left panel.
2. Paste your revised text in the right panel.
3. Read the diff. Changes are highlighted immediately:
   • Green — text present in the revised version that wasn't in the original (added)
   • Red — text present in the original that isn't in the revised version (removed)
4. Switch between views. The side-by-side view shows both versions in parallel. The inline view shows a single annotated document with additions and deletions marked in context.

---

Line-Level vs Word-Level Comparison

Line-level diff compares whole lines. A line that changed at all is marked as removed and replaced with the new version. This is how most code diff tools (Git, diff) work by default — clean and easy to read for code and structured text.

Word-level diff (also called inline diff) compares individual words within lines. Changes inside a paragraph are highlighted at the word level rather than marking the entire paragraph as changed. This is more useful for prose — a one-word change in a long sentence shows as exactly that one word, rather than the whole sentence.

---

Common Uses

Document revision review — compare a draft you sent for feedback against the version that came back. See every edit at once rather than reading through looking for changes.

Legal and contract review — track changes between two versions of a contract or agreement. Spot additions and removals in clauses without reading word-for-word.

Academic work — compare an essay before and after supervisor feedback, or check a submitted version against a revised one.

Code and config comparison — diff two versions of a configuration file, a script, or any code snippet that didn't go through version control. Useful when comparing files from two different environments or systems.

Content editing — editors comparing two versions of marketing copy, blog posts, or scripts can see all changes in one view rather than toggling between documents.

Proofreading — paste two versions of the same text to catch unintended changes introduced during editing — words accidentally deleted, phrases moved incorrectly, or substitutions that changed meaning.

---

Diff vs Version Control

A diff tool and version control (Git) serve related but different purposes. Git tracks the history of changes to files over time and is the right tool for code and ongoing project management. A diff checker is for one-off comparisons — when you have two text blobs and need to understand the difference, without needing a full repository or commit history.

---

Privacy

All text comparison happens in your browser. No text you enter is sent to any server or stored anywhere.