Text Diff Checker

Text Diff Checker

Added: 0

Removed: 0

Unchanged: 0

Original: 0 chars

Modified: 0 chars

Workflow & Usage

  1. Paste or type text into the Original and Modified editors.
  2. Click Diff to switch from editing to comparison view.
  3. Choose a diff mode:
    • Chars – highlight individual character changes.
    • Words – compare words while preserving spaces.
    • Lines – show added, removed, and unchanged lines with line numbers.
    • Patch – view a unified, Git-style diff.
  4. Adjust options:
    • Ignore case to treat uppercase/lowercase as equal.
    • Hide unchanged (Lines only) to collapse unmodified sections.
  5. Copy the output with one click, or swap/clear texts to start over.

Badges at the bottom show added, removed, and unchanged counts, plus original and modified character totals.

Use Cases

  • Copy & Content Editing Compare drafts, revisions, or translations to see exactly what changed.

  • SEO & Metadata Reviews Spot subtle differences in titles, descriptions, or keyword usage.

  • Config & Data Files Review .env, JSON, YAML, or text configs before deploying changes.

  • Code Snippets (Lightweight) Quickly inspect changes without opening a full code editor or Git client.

  • Client Feedback & Approvals Share a clean, readable diff instead of sending two long documents.

  • Audits & QA Verify that only intended lines or sections were modified.

Tips for Best Results

  • Use Words for prose. It highlights meaningful edits without noisy character-level changes.
  • Use Lines for structure. Ideal for paragraphs, lists, configs, and logs.
  • Use Patch when sharing. It’s the most portable format for issues, reviews, and emails.
  • Collapse unchanged lines. Focus attention on what actually changed.
  • Copy unified output. Paste clean diffs directly into tickets or docs.

How It Works

Everything runs client-side in your browser:

  • Multiple diff algorithms. Character, word-with-space, and line diffs are computed with proven text-diff logic. Patch view generates a standard unified diff format.

  • Line-aware rendering. Line diffs are expanded so additions and removals never share the same visual row, ensuring accurate line numbers.

  • Normalization for clarity. Line endings are normalized and end-of-file quirks are handled so formatting noise doesn’t appear as real changes.

  • Safe guardrails. Large or slow diffs are automatically aborted to keep the UI responsive.

  • Offline-first by design. Built as a Progressive Web App, the tool works without servers nor uploads.

Frequently Asked Questions

You can compare text at four levels: **Characters**, **Words**, **Lines**, and **Patch**. This lets you zoom from tiny edits (typos) to structural changes (paragraphs or files).

Patch view shows a unified diff similar to Git, with + and - lines, file headers, and context markers. It’s useful for sharing changes in issues, pull requests, or emails.

Yes. The tool normalizes CRLF/LF differences and suppresses false changes caused by missing final newlines, so you only see meaningful edits.

No. All comparison runs entirely in your browser. Your text never leaves your device and is never saved or transmitted.

Yes. This tool is a Progressive Web App (PWA). You can install it on your device and continue using it offline once it’s been loaded once, because all processing happens locally in your browser.

Yes, with guardrails. The tool uses timeouts to prevent long-running comparisons. If a diff becomes too slow, it aborts safely and suggests switching to Lines or Patch view.

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