DevTools Logo

Diff Checker

Diff Checker

Compare two text blocks and highlight differences side-by-side

About this tool

Compare two text blocks and highlight differences side-by-side Diff Checker runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.

What this tool does not do

  • Diff Checker is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.

How do I use this tool?

  1. How do I use Diff Checker?

    Open Diff Checker, enter or paste your input, and copy the result. The page works without an account.

Related guides

Text Diffing and Comparison: Understanding the Myers Algorithm

How diff algorithms compute minimum edit scripts, unified vs side-by-side comparison modes, and character-level change highlighting.

Related tools

Base64 Toolbox

Professional Base64 workspace for text, files and images with Base64URL, MIME, Data URI, strict validation, image preview and ready-to-use snippets.

C# to VB.NET Converter

Convert a subset of C# — classes, methods, variables, loops — into VB.NET

CSV Data Viewer

Paste CSV and browse rows in a sortable table with delimiter detection

CSV to Chart

Paste or upload CSV data and generate bar, line, pie, or doughnut charts. Export as PNG.

CSV to JSON Converter

Paste CSV data and convert it to pretty-printed JSON instantly — supports custom delimiters, header row toggling, and value trimming.

CSV to Markdown Converter

Convert CSV to a Markdown table and Markdown tables back to CSV