---
title: "Diff Checker — Documentation & FAQ"
description: "How to use Diff Checker, plus answers to common questions."
canonical: "https://www.razi.pro/tools/diff-checker/docs"
tags: ["diff checker", "compare text online", "code difference tool"]
source: "razi.pro"
---

# Diff Checker — Documentation & FAQ

Documentation for [Diff Checker](https://www.razi.pro/tools/diff-checker) — Compare source code or text files side-by-side with highlighted changes.

## Quick start

Paste original text on the left and modified text on the right to see color-coded differences.

## Frequently asked questions

### How do I compare two text files online?

Paste your original text on the left and the modified text on the right. The tool will instantly highlight additions, deletions, and changes with color coding for easy comparison.

### Can I compare code files?

Yes. The diff checker works with any text including source code, configuration files, JSON, XML, and more. Syntax differences are highlighted line by line.

### Does the diff checker support side-by-side view?

Yes. Changes are displayed side-by-side with color-coded highlighting: green for additions, red for deletions, and yellow for modifications.