One of 55 free AI tools built by Zalt, an AI architect and consultant with 16 years of experience.
Free Text Diff Compare
Paste two versions of any text and instantly see the differences highlighted with additions, deletions, and changes. Switch between four diff modes — character, word, line, and sentence — to get exactly the level of detail you need. Powered by jsdiff, the most widely used JavaScript diff library, implementing the Myers diff algorithm (the same algorithm used by git). All processing happens locally in your browser — no signup, no server, no data sent anywhere.
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Why Use a Text Diff Tool?
Comparing two versions of text by eye is slow and error-prone — you will miss subtle word changes, deleted sentences, and rearranged paragraphs. This text diff tool highlights every addition, deletion, and change instantly, so you can see exactly what is different between two versions without reading both line by line.
The tool is powered by jsdiff, the most widely used JavaScript diff library. It implements the Myers diff algorithm — the same algorithm used by git — to produce minimal, accurate diffs. Choose from four comparison modes: character diff for spotting typos, word diff for general text comparison, line diff for code and config files, and sentence diff for reviewing paragraph-level edits. Green highlights show additions, red with strikethrough shows deletions.
Use it to compare drafts of documents, review AI-generated text against the original, check configuration changes, proofread edits, or verify what changed between two API responses. All comparison happens locally in your browser — your text is never uploaded or stored anywhere.
Four Diff Modes for Every Use Case
Not all text comparisons are the same. A single typo needs character-level precision, while a document rewrite is easier to review sentence by sentence. This tool gives you four diff modes so you can match the comparison granularity to the task.
Character diff compares every individual character, making it ideal for catching typos, spacing issues, and subtle formatting changes. Word diff (the default) treats each word as a unit, which is the most natural way to compare edited prose, articles, and general text. Line diff compares entire lines at once, mirroring how git diff works — best for source code, JSON, YAML, and configuration files. Sentence diff treats each sentence as a token, giving you a high-level view of structural changes in paragraphs and documents.
All four modes use the same underlying Myers diff algorithm to find the minimum set of changes, ensuring accurate and optimal results regardless of which mode you choose.
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How It Works
Paste or type the original text on the left and the modified text on the right.
Choose a diff mode: character, word, line, or sentence.
Click Compare and see differences highlighted instantly.
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Key Features
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Use Cases
Limitations
- Best suited for plain text comparison
- Does not support syntax-aware diffing for code
- Very large texts may slow the comparison