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Text Diff — Compare Two Texts, Line by Line

Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, browser-only

  • Runs locally
  • Category Text
  • Best for Removing repetitive cleanup work from everyday writing and operations.
Added
0
Removed
0
Unchanged
0
Paste text on both sides to see a diff.

What this tool does

Free online text diff tool for comparing drafts, code snippets, configuration files, release notes, legal clauses, translations, and support replies. Paste the original text on the left and the revised text on the right; the result marks deleted, added, and unchanged lines with clear colors. The implementation uses a Myers-style line-level LCS diff, the same family of algorithms used by Git, so it keeps stable matching lines together instead of producing noisy add/delete pairs. It is intentionally line-based: perfect for config, markdown, CSV fragments, logs, and edited paragraphs where line breaks carry meaning. Everything runs in the browser, so private drafts and internal snippets are not uploaded.

Tool details

Input
Text
The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output
Live result
The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy
Browser-side processing
The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share
No account required
Open the page and use it; whether results survive refresh depends on the tool.
Performance budget
Initial JS <= 10 KB
No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit
Text · Developer
Category and role tags drive related tools, internal links, and quick fit checks.

How to use

  1. 1. Input

    Paste or drop your content into the tool panel.

  2. 2. Process

    Click the button. All processing is local in your browser.

  3. 3. Copy / Download

    Copy the result or download to disk in one click.

How Text Diff fits into your work

Use it to clean, compare, reshape, or extract plain text before it goes into a document, CMS, spreadsheet, or prompt.

Text jobs

  • Removing repetitive cleanup work from everyday writing and operations.
  • Making text easier to compare, paste, publish, or feed into another tool.
  • Working with content locally when the text is private or unfinished.

Text checks

  • Scan for unintended whitespace, duplicate lines, and lost punctuation.
  • For long text, test the first few lines before applying the whole change.
  • Copy the final output only after checking the preview.

Good next steps

These links move the current task into a more complete workflow.

  1. 1 Text Deduplicator Remove duplicate lines from any list — case-sensitive optional, whitespace-trim optional, count duplicates — browser-only Open
  2. 2 Text Sorter Sort lines alphabetically, numerically, by length, or reverse — case-sensitive optional — browser-only Open
  3. 3 Text to Binary Converter Text to binary (and back) — UTF-8 aware, 8/16/32 bit grouping, emoji safe. Open

Real-world use cases

  • Review copy, release notes, and documentation edits

    Paste the previous draft and the edited draft to see which lines changed before publishing. This is useful when edits arrive through chat, email, or a CMS that does not provide a built-in diff view.

  • Compare config, logs, or code snippets safely

    Developers and operators can compare two small config files, environment snippets, SQL fragments, or log excerpts without uploading internal text to a third-party diff service.

  • Check translation and localization changes

    Put the old localization file or paragraph on one side and the new version on the other to catch missing lines, accidental deletions, and reordered content.

Common pitfalls

  • Expecting word-level highlighting. This tool is line-level by design, so edits inside one line appear as a removed line plus an added line.

  • Pasting huge files. Line diff can become memory-heavy at very large sizes; split giant files into sections.

  • Ignoring whitespace changes. Extra blank lines or indentation shifts are real line changes and will be highlighted.

Privacy

The diff algorithm runs entirely in the browser. Toolora does not upload the left or right text, which makes the tool suitable for drafts and internal snippets.

FAQ

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Made by Toolora · 100% client-side · Updated 2026-06-13