CompareDiff

Compare Text, JSON, Images, PDFs & AI Edits

Privacy-first comparison tools. All processing happens in your browser.

Image Diff

Compare images with visual modes

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Before/After

Interactive image slider

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Text Diff

Line, word & character diff

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JSON Diff

Validate & compare JSON

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PDF Compare

Compare PDFs locally

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Why Use CompareDiff?

Privacy First

Your text, JSON, images, and PDFs are processed locally in your browser. No uploads, no server storage, no data collection.

Instant Results

No waiting for uploads or server processing. Compare files instantly with line-by-line, pixel-by-pixel, or key-by-key comparisons.

Multiple Formats

Compare text documents, JSON API responses, images, screenshots, PDFs, and AI-generated content all in one place.

Common Use Cases

For Developers

  • • Compare code changes before and after refactoring
  • • Validate JSON API responses across environments
  • • Check configuration file differences
  • • Review text-based diff output

For Designers & QA

  • • Visual regression testing for UI changes
  • • Compare design mockups with implemented UI
  • • Check screenshot differences across browsers
  • • Validate pixel-perfect implementations

For Content Creators

  • • Compare AI-generated image variations
  • • Show before/after photo editing results
  • • Track document revisions and changes
  • • Compare different AI model outputs

For Teams

  • • Review pull request changes visually
  • • Compare staging vs production outputs
  • • Validate data migrations and transformations
  • • Share visual comparison results

How It Works

  1. 1

    Choose Your Tool

    Select the comparison type you need: text, JSON, images, PDFs, or before/after slider.

  2. 2

    Upload or Paste Content

    Paste text directly, upload images or PDFs, or input JSON. Everything stays in your browser.

  3. 3

    Get Instant Results

    See highlighted differences, visual overlays, or side-by-side comparisons immediately.

  4. 4

    Download or Share

    Copy reports, download difference maps, or export comparison images.

Frequently Asked Questions

Is my data uploaded to your servers?

No. CompareDiff processes your content locally in your browser. Your files never leave your device.

What file formats are supported?

Text Diff accepts any plain text. JSON Diff validates JSON objects. Image tools support PNG, JPG, JPEG, and WebP up to 5 MB. PDF Compare accepts PDF files up to 25 MB.

Do I need to create an account?

No account needed. All tools are immediately available without registration or login.

Can I use this for sensitive documents?

Yes. Since processing happens locally in your browser, your sensitive content is not transmitted to any server.