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Online Diff Generator

Paste two versions of text and generate a clear diff with added/removed lines or words. This tool runs in your browser (no upload) and lets you copy a compact unified diff.

Category: Text · URL: /tools/online-diff-generator.html
Mode
Tip: Line mode is best for code/logs; Word mode is best for short sentences.
Original
Modified
Diff Output
Green = added, red = removed, gray/blue = unchanged/context.
Related tools: Diff Generator Online · Online Case Generator · Text Checker English · Online Slug Generator · Markdown Table Generator

No diff yet. Paste text and click “Generate Diff”.


    

  



          

          

            Privacy: runs locally in your browser. No uploads, no tracking scripts.
          

        

      


      
    


    

      
How to use

      
Use this diff generator to compare two text blocks.
  1. Paste the original text on the left and the updated text on the right.
  2. Select Line (best for code/logs) or Word (best for short prose).
  3. Optionally hide unchanged content and set context lines.
  4. Click Generate Diff, then Copy Diff if you want a shareable unified output.

      

        Keywords this page targets (natural cluster): online diff generator, text diff online, compare two texts online, diff checker, line by line diff, word diff tool, unified diff generator, diff viewer online, compare code snippets, find differences between two texts, text comparison tool, git style diff online, patch diff output, client side diff tool, no upload diff, side by side text compare, difference checker online, compare two versions of text
      

      

        Secondary intents covered: Compare two versions of a document and see what changed, Generate a unified diff you can paste into a ticket or PR comment, Review edits with optional context lines around changes, Swap inputs to compare in the opposite direction, Hide unchanged content to focus only on additions/removals, Do a quick word-level diff for small edits inside a sentence, Copy the diff output for sharing or archiving, Check whether two texts are identical before publishing
      

    


    

      
FAQ

    
Is this online diff generator client-side (no upload)?
Yes. The diff is computed in your browser and the tool does not send your text to a server.
What’s the difference between Line mode and Word mode?
Line mode compares newline-separated lines (best for code/logs). Word mode compares words and spaces to highlight small edits inside sentences.
Can I hide unchanged lines and keep context around changes?
Yes. Enable “Hide unchanged” and set the number of context lines to keep around each change.
Does it generate a Git-style unified diff file?
It outputs a compact unified-style view with +/− prefixes for easy sharing, but it’s not a full patch format with file headers.
Why do I see “(empty line)” in the output?
That label is used to make empty lines visible in Line mode so you can spot added/removed blank lines.
What if my text is very large?
Very large inputs may hit browser limits. Switch to Line mode, hide unchanged lines, or compare smaller sections.
Can I copy the diff output?
Yes. Click “Copy Diff” to copy a plain-text unified output to your clipboard.