# Code & Text Diff / Patch Studio

> Private Code & Text Diff Checker | Privatools
> Canonical URL: [https://privatools.dev/tools/diff-viewer/](https://privatools.dev/tools/diff-viewer/)
> Markdown Alternate: [https://privatools.dev/tools/diff-viewer.md](https://privatools.dev/tools/diff-viewer.md)
> Execution Architecture: 100% Client-Side In-Memory Execution (Zero Remote Egress)

## Overview
Compare text, source code, JSON configs, and documentation with side-by-side or unified difference views. Highlights line changes, insertions, and character-level edits with zero data leakage.

## Format Specifications
- **Category:** Data & Config
- **Supported Formats:** `Diff`, `Patch`, `Code`, `JSON`, `Text`
- **Privacy Guarantee:** 0 bytes uploaded to remote servers. All computation executes locally in browser memory.
- **Compliance:** GDPR, HIPAA & SOC 2 Friendly (process sensitive payloads and PII directly on your local device).

## Technology Stack
- diff-match-patch Algorithm
- Character-level Myers Diff
- Dual Synchronized Scroll Engine
- Unified & Split Renderers

## How It Works
1. Left (original) and right (modified) texts are parsed into lines and lexical tokens locally.
2. The Myers diff algorithm calculates the shortest edit script to transform the original into the modified text.
3. Word-level and character-level differences are calculated within changed lines for precision debugging.
4. Synchronized dual-pane scrolling enables seamless review across lengthy documents.

## Practical Use Cases
### Reviewing Proprietary Source Code
Compare code snippets, configuration files, or database schemas before committing without exposing intellectual property to public pastebins.

### Legal Contract & Document Redlining
Detect precise clause revisions, additions, and deletions between two versions of confidential business agreements.

### API Response & JSON Payload Verification
Compare production vs staging API responses to identify regression bugs and unexpected field changes.

### Release Notes & Changelog Verification
Verify documentation updates and configuration diffs across multi-tier deployment environments.

## Frequently Asked Questions
### Are my diff inputs stored or sent to a server?
No. Diff computation runs entirely on your CPU within the browser thread. Zero text is uploaded or retained.

### Can I toggle between Side-by-Side and Unified views?
Yes. You can switch between split-view and inline unified view with a single click, with responsive adaptation for smaller screens.

### Does it show character-level differences within modified lines?
Yes. Changed lines highlight the exact characters or words that were added, removed, or altered.

## Related Tools
- [Structured Data Converter](https://privatools.dev/tools/data-converter/)
- [Text & Encoding Studio](https://privatools.dev/tools/text-converter/)
- [Markdown & Technical Documentation Studio](https://privatools.dev/tools/markdown-lab/)

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