Text Difference Checker - Find Every Change, Free
Compare any two texts with 4 diff modes - word, character, line & sentence. Get a live similarity score, change statistics, and export colored HTML diffs. Character-level diff is free here. Everywhere else it costs $8/month.
What makes it different
The free diff tool that goes
deeper than the paid ones.
Four diff modes including character-level, a live similarity score, change statistics, HTML export, and a share link - all completely free.
Character-level diff
See exactly which characters changed inside a word - not just that the word changed. Diffchecker locks this behind a $8/month paywall. Yours is free.
free · Diffchecker Pro featureLive diff as you type
The diff updates in real time as you type in either panel - no clicking Compare, no waiting. Toggle to manual if you prefer.
instant · no button neededSimilarity score
An animated gauge shows the percentage similarity between both texts - from identical (100%) to completely different (0%). No other free tool shows this clearly.
LCS-based score · animated gaugeChange statistics
Words added, removed, and changed. Character counts. Line counts. Reading time delta. All updated live - Diffchecker shows none of this free.
words · chars · lines · reading timeExport colored HTML
Download the diff as a self-contained HTML file with green/red highlights - paste it into any CMS, email, or document. Diffchecker charges for PDF export.
HTML · .txt · share linkSession history
Your last 5 comparisons are saved locally - one click to restore any previous pair. No account, no cloud, nothing uploaded.
browser-local · privateQuick guide
Compare two texts in 3 steps
Works on any device. No login, no extension, no install.
Paste your original text
Paste the original version into the left panel - an essay draft, a contract clause, a code snippet, or any text you want as the baseline.
Paste the modified text
Paste the revised version into the right panel. The diff, similarity score, and change stats appear instantly - no button to click.
Switch modes & export
Toggle between Word, Char, Line, and Sentence diff modes to see changes at different granularities. Export as HTML or share a link.
Who uses a text difference checker - and why
Text diffing is not just for developers. Anyone who works with documents, writing, or contracts uses it daily. Here are the people who benefit most.
Writers & editors
Compare drafts to see exactly what changed between revisions. Spot accidental deletions or additions in seconds.
Developers
Diff code snippets, config files, or JSON payloads without opening a terminal. Line mode mirrors Git-style output.
Lawyers & paralegals
Catch subtle word changes in contract clauses - "shall" vs "may", "exclusive" vs "non-exclusive". Character diff makes these visible.
Students & teachers
Compare essay versions, check if revisions were actually made, or verify that submitted work matches a reference document.
Translators
Compare a source text against its updated version to identify only the sentences that need re-translating.
Content teams
Track changes between published and updated web pages, blog posts, or product descriptions to audit what actually changed.
The 4 diff modes - which one to use when
Different situations call for different levels of granularity. Here is when to use each mode.
Word diff - best for most writing tasks
Highlights entire words that were added, removed, or changed. This is the most readable mode for comparing prose, blog posts, emails, and reports. It gives you a clear picture of how the meaning of a sentence changed without getting lost in individual characters.
Character diff - best for proofreading and legal text
Goes inside each word and highlights the exact characters that changed. Essential for catching typos (their vs there), subtle word substitutions in contracts, or spacing errors that word-level diff would miss entirely. This mode is behind a paywall on Diffchecker and most other tools - it is free here.
Line diff - best for code and structured data
Compares text line by line, the same way Git displays changes. Ideal for code files, configuration, CSV data, or any text where line structure carries meaning. Added lines are shown in green, removed lines in red, with line numbers for navigation.
Sentence diff - best for documents and contracts
Splits both texts into sentences and compares them as units. This mode is ideal when you want to understand which complete thoughts were added or removed, rather than individual words. Useful for reviewing policy documents, terms of service updates, or academic papers.
How ToolNexIn compares to Diffchecker
| Feature | ToolNexIn | Diffchecker Free | Diffchecker Pro ($8/mo) |
|---|---|---|---|
| Word diff | FREE | FREE | FREE |
| Character diff | FREE | PAID | INCLUDED |
| Line diff | FREE | FREE | FREE |
| Sentence diff | FREE | PAID | INCLUDED |
| Similarity score | FREE | ❌ | ❌ |
| Live diff (no button) | FREE | ❌ | ❌ |
| Change statistics | FREE | ❌ | ❌ |
| Export HTML | FREE | PAID | INCLUDED |
| Share link | FREE | PAID | INCLUDED |
| Session history | FREE | ❌ | ❌ |
| Signup required | Never | No | Yes |
| Text uploaded to server | Never | Yes | Yes |
FAQ
Text diff questions,
answered.
Everything about comparing texts, diff modes, and what the scores mean.
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