onul.works

Diff Viewer

Use a text diff viewer to compare two texts and visualize differences.

⌘ Runs in browser ◴ No data stored ⌁ Free

Concept

Compare text changes across versions

Diff Viewer helps verify document, code, or config changes by comparing before-and-after text in one view.

Use it when validating document revisions, code snippets, or configuration files by pasting the original and updated versions and checking what was added, removed, or changed.

Line-level diff highlights whole-line changes for fast scope checks, while character-level diff helps identify tiny updates such as spacing, punctuation, or typo changes.

Before/after review

Compare two versions of documents, PR drafts, and notes to locate missing, inserted, or rewritten sections quickly.

Interpret by granularity

Use line-level diff for broad edits and character-level diff for subtle differences, and then verify the exact change intent in context.

Input safety checks

Before pasting, review sensitive values (secrets, tokens, credentials) and split large payloads if needed to keep comparisons safe and readable.

This is a text-only diff tool. Redact confidential content and chunk large files before comparing.

Original text
Text to compare
Line diff result

How to use

  1. 1 Paste the original text into the left editor.
  2. 2 Paste the modified text into the right editor.
  3. 3 Choose line, word, or character comparison and click compare.
  4. 4 Review the highlighted additions, removals, and changes in the diff result.

Common use cases

  • Document revision comparison
  • Configuration file change review
  • Line, word, or character diff viewer checks

Frequently asked questions

How does the tool compare two texts?

Enter the original and modified text, then choose character, word, or line mode to highlight added and removed parts in a simple difference viewer.

Can I paste from the clipboard or clear the inputs?

Yes. The paste button fills the original text field, and the clear button empties both comparison fields. Ctrl+Enter also runs the comparison.

Does it merge code or compare files?

This tool shows differences between the text you enter. It does not upload files, merge changes automatically, or perform syntax-aware code analysis.

Related workflow

Diff ViewerCompare the before and after text first to narrow the edit scope. → Cron GeneratorContinue here when schedule wording or a Cron expression needs cleanup. → Keycode InfoCheck the key event values needed for the changed input flow.