Is the Text Diff free to use?

Yes, our Text Diff is completely free with no registration required. Use it unlimited times without any restrictions.

Is my data secure when using this tool?

Yes, all processing happens locally in your browser. Your data never leaves your device and is not stored on our servers.

Do I need to install anything?

No installation needed. The tool works directly in your web browser on any device.

How do I use the Text Diff?

Enter your input, click the action button, and get instant results. Copy the output for use in your projects.

Text Diff - Free Online Tool

Last updated March 22, 2026

How to Use

Paste your original text or code in the left textarea
Paste the modified version in the right textarea
Click "Compare Texts" to see differences
Red lines show deletions, green lines show additions
Unchanged lines appear in normal text

Why Use the Text Diff Tool

Multiple diff views — side-by-side, inline, and unified diff formats
Character-level diff — see exactly which characters changed within a line
Whitespace control — ignore or include whitespace changes as needed
Syntax highlighting — code diffs are easier to read with language-aware highlighting
Export options — download as HTML, unified diff, or plain text
Complete privacy — documents never leave your browser, all comparison is client-side

Whether you are reviewing code, comparing configuration files, tracking document changes, or verifying patches, the Text Diff Tool at TechConverter.me makes text comparison fast, visual, and accurate.

Features

Line-by-line comparison with color-coded output
Highlights additions in green and deletions in red
Works with any text format: code, documents, logs
100% client-side processing - your data never leaves your browser
No file size limits or usage restrictions
Mobile-responsive design for on-the-go comparisons
Instant results with no server delays

Common Use Cases

Code Review

Compare code before and after changes to review modifications, identify bugs, and ensure code quality. Perfect for pull request reviews and pair programming sessions.

Document Comparison

Track changes in contracts, articles, or documentation. Identify what was added, removed, or modified between versions.

Configuration Files

Compare configuration files to troubleshoot issues, verify settings, or understand changes between environments (dev, staging, production).

Log Analysis

Compare log files from different time periods to identify new errors, warnings, or changes in application behavior.

Examples

Example 1: Comparing Two Versions of a Configuration File

A DevOps engineer needs to compare a production nginx.conf with a staging version before deploying a change. They paste both files into the diff tool and immediately see the differences highlighted:

Original (production):
  worker_processes 2;
  keepalive_timeout 65;
  client_max_body_size 10m;

Modified (staging):
  worker_processes 4;
  keepalive_timeout 75;
  client_max_body_size 50m;

The diff highlights three changed lines in red (removed) and green (added). The engineer can confirm the changes are intentional before deploying. No surprises in production.

Example 2: Code Review — Spotting Unintended Changes

A developer submits a pull request claiming to fix only a single bug. A reviewer pastes the old and new versions of the file into the diff tool and notices an unintended change:

Original:
  const timeout = config.timeout || 5000;

Modified:
  const timeout = config.timeout || 3000;  // changed from 5000 to 3000

The reviewer spots the timeout change that was not mentioned in the PR description. Using the character-level diff mode makes it immediately obvious that only the number changed, not the surrounding code. The reviewer asks the developer to explain the change before merging.

Example 3: Document Editing — Tracking Changes

A technical writer submits a revised version of an API documentation page. The editor uses the diff tool to see exactly what changed between the original and revised versions:

Added lines appear in green — new sections, new examples, new notes
Removed lines appear in red — outdated information, deprecated endpoints
Modified lines show both the old and new version — updated parameter descriptions, corrected examples

The editor can review all changes in minutes instead of reading the entire document again. The diff view makes it impossible to miss any change, no matter how small.

Text Diff Checker