Copy edit
Input
Small tools stay in your browser. Copy the result when ready.
Output
Small local tools stay in your browser. Copy the result when it looks right.
Text Diff Checker
Paste an original and changed version to inspect what was added, removed, or left unchanged.
Text tools
What it helps with
- Compare two drafts before sharing
- Review generated text changes
- Inspect small config or notes edits
How to use
- Paste the original text and the changed text into the two input areas.
- Review added, removed, and unchanged line counts with the highlighted diff.
- Copy the summary when you need a compact change note.
Examples
List change
Input
JSON Formatter SQL Formatter URL Encoder
Output
JSON Formatter SQL Formatter Regex Tester URL Encoder
Good to know
- Line-level diff only, with simple inline word highlights for nearby changed lines.
- Not a merge tool.
- Very large inputs can slow the browser tab.
FAQ
- Does this text diff upload my input?
- No. The comparison is designed to run in your browser for this tool.
- Is this a merge tool?
- No. It helps inspect differences, but it does not merge files or resolve conflicts.
- Does it show inline changes?
- For nearby removed and added line pairs, it shows a simple word-level highlight.
Related tools
Nearby utilities from the KoguNavi toolbox.
Text tools
Character / Word Counter
Count characters, words, lines, bytes, and Japanese writing estimates.
Open tool →
Text tools
Markdown Live Preview
Write Markdown and preview the rendered page.
Open tool →
Text tools
Japanese Punctuation Converter
Normalize Japanese punctuation, spaces, brackets, and dash variants.
Open tool →