Text diff

About Text diff

Text Diff compares two blocks of plain text line by line and shows exactly what was added, removed, or unchanged. Works with any text — code, prose, configs, logs, lists, or markdown — no JSON structure required.

When to use Text diff

• Review changes to a configuration file or settings document
• Compare two versions of a paragraph or article draft during editing
• Find differences between two log file excerpts during debugging
• Check if two code snippets are identical or spot subtle line-level differences
• Verify a data transformation preserved all expected plain-text lines

How it works

Paste two text blocks separated by a line containing "---". The tool splits both inputs into individual lines and runs a line-by-line comparison. Lines present only in the left block are prefixed with "-"; lines present only in the right block are prefixed with "+"; lines shared by both appear without a prefix.

Example

Text Diff output

Input:

first line
shared line
old ending
---
first line
shared line
new ending

Output:

  first line
  shared line
- old ending
+ new ending

Privacy & security

Text diff runs entirely in your browser. No input data is uploaded to any server, stored in a database, or shared with third parties. You can use it offline once the page has loaded.