Free Text & Code Diff Checker Online — Compare Two Files Side by Side

About Our Free Visual Diff Checker Tool

Whether you're reviewing code changes, comparing document versions, or spotting edits between drafts, our Visual Diff Checker highlights exactly what's different between two texts. Additions are highlighted in green, deletions in red — making it instantly clear what changed and where.

Everything runs in your browser. Paste code, configuration files, emails, essays — anything text-based — and get a clear visual diff without uploading files to any external service.

Key Features

Visual Highlighting — Green for additions, red for deletions
Line-by-Line & Word-Level — Toggle between diff granularity
Handles Any Text — Code, prose, config files, JSON, markdown
100% Private — Nothing is uploaded or stored
Instant — Diff renders immediately as you paste

How to Use Visual Diff Checker

Paste your original text in the left panel
Paste the modified text in the right panel
The diff highlights automatically — green for additions, red for deletions
Toggle between line-level and word-level diff as needed

Frequently Asked Questions

What is a diff and why is it useful?

A diff (short for difference) shows exactly which lines or words were added, removed, or changed between two versions of a text. It is used by developers with git, technical writers reviewing document edits, and anyone who needs to quickly identify what changed between two versions.

Can I use this to compare code files?

Yes. The diff checker works with any plain text, including source code in any language. For the best results with code, ensure consistent indentation between the two versions.

Does this tool support three-way merges?

Currently the tool supports two-way comparison. Three-way merge (comparing two versions against a common ancestor) is a more complex operation typically handled by version control systems like git.