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Text Processing

Three-Way Text Comparison & Merge Suite

· Last updated：2026-08-07

Line/word/char diff with ignore rules, three-way merge with conflict markers, and unified patch

Details

What this tool helps you do

Compares two texts at line, word, or character granularity with optional case/whitespace ignoring, performs a three-way merge of two branches against a common ancestor (marking conflicts Git-style), and emits a unified patch. Based on jsdiff (LCS). Pure local — no AI, no network.

Execution

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Text Processing
Input types
textarea, select, checkbox, number
Output type
html
Sample coverage
4
API ready
Yes

Overview

Compare two text blocks by line, word, or character, merge two branches against a shared ancestor, or generate a unified patch. You can optionally ignore letter case and whitespace, and three-way conflicts are marked in Git style.

When to use

  • Review additions, removals, and changes between two versions of a text.
  • Combine two edited branches while checking for changes made in the same area.
  • Create a unified patch showing how to change Branch A into Branch B.

How it works

  1. 1Enter Branch A and Branch B in the two required text areas.
  2. 2For a three-way merge, also enter the common ancestor in the Base / ancestor field.
  3. 3Choose Two-way diff, Three-way merge, or Patch, then select line, word, or character granularity.
  4. 4Optionally ignore case or whitespace and set the number of context lines for patch output.

Use cases

  • Compare revised documentation, configuration text, or source code at the level that best exposes the change.
  • Merge independent edits from two branches using a common ancestor and identify overlapping changes.
  • Prepare a compact unified patch for reviewing or communicating text changes.

Examples

1. Combine independent branch edits

Developer

Background

A developer has a shared four-line base text. Branch A changes the second line, while Branch B changes the fourth line.

Problem

Merge both edits without treating changes in separate areas as conflicts.

How to use

Enter the shared text as Base / ancestor, place each branch in its respective field, and select Three-way merge with line granularity.

mode: threeway; granularity: line; ignoreCase: false; ignoreWs: false

Outcome

The two non-overlapping changes are combined into one result with zero conflicts.

2. Review a line-level text revision

Technical writer

Background

A document version contains the lines "alpha", "beta", and "gamma". The revised version changes "beta" to "BETA" and adds "delta".

Problem

Identify the replacement and newly added line quickly.

How to use

Enter the original text as Branch A and the revised text as Branch B, then select Two-way diff with line granularity.

FAQ

What inputs are required?

Branch A and Branch B are required. A Base / ancestor text is needed for three-way merge mode.

What comparison levels are supported?

You can compare text by lines, words, or characters.

Can the comparison ignore case or whitespace?

Yes. Enable Ignore case or Ignore whitespace before running the comparison.

How are three-way conflicts shown?

Conflicts are marked with Git-style conflict markers so you can review both branch changes.

What does Patch mode produce?

Patch mode produces a unified patch describing the changes from Branch A to Branch B.

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mode: twoway; granularity: line; ignoreCase: false; ignoreWs: false

Outcome

The HTML result shows the changed line and the added line in the A-versus-B diff.