Compare two text blocks word by word and see additions and deletions highlighted in a single merged view, entirely in your browser.
Part of our Text & Documents collection — Explore more Text & Documents tools · See also: Word Counter, Text Tools: Clean, Convert & Reverse.
Quick answer: Text Diff Checker — Compare two texts word by word Free, no signup, runs in your browser. See below for the interactive tool, 4-step guide and FAQs.
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Reviewed by the Tool4SaaS Editorial Team — In-house reviewers who build and test every tool locally for accuracy across current Chrome, Edge, Firefox, and Safari. Last updated: . See our authors, methodology or contact us.
Contrasts two pasted passages token by token, marking insertions green and deletions red for rapid revision audits. For example, version 1 versus version 2 of 500-word features reveals 23 edits instantly. Breaks and punctuation remain visible aiding editorial precision.
No. The comparison happens entirely in your browser: both drafts stay on your machine, are never uploaded, and are discarded as soon as you close the page.
Yes. The comparison is word-level and has no explicit size cap, but very large inputs can take longer because the algorithm builds a table for the changed middle section. When that section exceeds one million token pairs, the tool skips fine-grained matching and marks the remainder as removed, then added. For long documents, compare chapter by chapter.
There is no line mode. Reordered paragraphs appear as paired deletions and insertions, so read the surrounding context before treating them as rewrites. For example, a moved 200-word methodology can look like extensive word churn even when the wording is unchanged.
Trailing spaces, double gaps and tab conversions alter token streams despite invisible appearance. For example, colour to color and extra space triggers dual markers. Normalize via cleaner beforehand to isolate substantive edits from formatting noise.
The tool compares two pasted passages word by word and renders one merged view with additions and deletions highlighted. Load the original in the first field and the revision in the second; unchanged text stays plain, removed words get a red strikethrough, and added words get a green background. Example: two 500-word drafts that differ in 23 places show those edits directly. It is useful for press releases, contracts and configuration files, but it is a reading aid rather than a merge tool.
Segmentation splits on whitespace while keeping punctuation and line breaks, so formatting changes count as tokens. A port change from 8080 to 9090 appears as a paired removal and addition, and a case-only edit also shows as a change rather than a subtle highlight. There is no ignore-case or ignore-whitespace option. When the changed middle section exceeds one million token pairs, the tool falls back to marking the old remainder as removed and the new remainder as added. Edge case: CJK text without spaces produces large token chunks, and very long inputs can be slow.
Load an original and a revised 500-word copy, review the green additions and red removals, then apply the preferred wording in your own document; the output is read-only. Word granularity suits prose but does not provide character-level merges, three-way reconciliation or rich-text formatting. For bulk literal and pattern substitution across a long document, continue in the Text Tools workspace. The comparison is case-sensitive, and the output is not downloadable; there is no copy button, so select the merged text manually if you need it elsewhere. The merged view updates as you type. Document decisions and archive version pairs for later comparison.