Diff Checker
Paste an original and modified version of any text to see added and removed lines. Switch between side-by-side columns and a unified inline view.
Compare text
How to use this tool
Open the Edit tab and paste your baseline content into the Original field. Put the updated version in Modified. The diff runs automatically as you type, so you can iterate on migrations, copy updates, or config changes without leaving the page.
Switch to Diff result to inspect changes. Side-by-side mode shows both versions in parallel — ideal for reviewing pull requests or comparing environment files. Inline mode stacks additions and deletions in one panel, which is easier to screenshot or paste into tickets.
Removed lines appear with a red background; added lines use green. Unchanged lines stay neutral so you can scan for drift quickly. Use this alongside the JSON formatter when validating API payloads, or with the regex tester when checking pattern replacements across a document.
Frequently asked questions
- Which diff view should I use?
- Side-by-side works well for comparing whole files. Inline view merges changes into one stream, which is helpful for small edits and code review comments.
- Does the diff work line by line?
- Yes. The checker compares text line by line and highlights additions in green and removals in red.
- Is there a file size limit?
- There is no server upload, so limits depend on your browser. Very large inputs may feel slower but stay on your device.