Text Diff Checker
Compare two pieces of text to find differences.
Powerful Text Comparison
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Comparing Two Texts to Spot Every Difference
Overview
A text diff tool compares two blocks of text and highlights exactly what changed — words added, removed, or edited — so you don't have to hunt line by line. It's the same idea developers use for code review, applied to any writing: contracts, drafts, config files, or translated copy. This tool runs the comparison in your browser, so both versions stay private and nothing is uploaded.
How to Use (Step by Step)
- 1
Paste the original text
Put the first (or older) version into the left side.
- 2
Paste the changed text
Put the second (or newer) version into the right side.
- 3
Read the highlighted differences
Additions and deletions are color-coded so every change stands out at a glance.
How It Works
You paste an original text on one side and a revised text on the other. The tool aligns the two and marks the differences, typically showing removed content in one color and added content in another. It compares at the line, word, or character level depending on the mode, making even small edits easy to see. All processing is local, so confidential documents never leave your device.
When to Use This
Reviewing edits between two drafts of an article or contract. Checking what changed between two versions of a config or data file. Confirming a copy-paste didn't drop or alter text. Comparing a translation against its source for missing sentences. Spotting subtle changes someone made to a shared document. Verifying two supposedly identical texts really match.
Frequently Asked Questions
Most diff tools offer more than one granularity. Line mode is best for code or structured data; word or character mode is better for prose, where a single word changed inside a long sentence.
Important Notes
A diff shows what changed, not whether the change is correct. Reformatting (like different line wrapping) can produce noisy differences even when the meaning is identical.