Skip to content
We use cookies to improve the site and measure traffic. See our Cookie Policy. You can accept or reject non-essential cookies.
ToolYour Logo
  • Free
  • No signup
  • Fast
  • Privacy-friendly

Back to Category

Duplicate Content Checker

Compare two URLs or pasted texts for lexical similarity, shared n-grams, and uniqueness risk — no generative AI.

Free · API · MCPToolYour platform

Use Duplicate Content Checker three ways

The free Duplicate Content Checker on this page works in your browser. The same workflow is available via REST API for apps and via MCP for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the seo-apis module under Digital Tools.

  • Free in browserUse Duplicate Content Checker here — no account required.
  • REST APICall from your server with X-Api-Key.
  • MCP for agentsConnect Cursor or Claude to ToolYour MCP with the same key.
  • 1. Get an API keySign in and open Dashboard → API Keys (works for REST and MCP).
  • 2. Call or connectUse the REST API from your server, or paste the MCP URL into your agent config.
  • 3. Same qualityOutput matches the free web tool across all three surfaces.
Manage API keysMCP setupAPI referenceCreate free account

What is Duplicate Content Checker?

Near-duplicate and thin-variant pages waste crawl budget and blur which URL should rank. You need a measurable overlap signal — not a vague “feels similar” judgment.

Duplicate Content Checker compares two public URLs (visible body text) or two pasted drafts using token Jaccard plus bigram/trigram overlap. It surfaces shared n-grams, tokens unique to each side, and severity-ranked guidance (exact match, near-duplicate, moderate overlap). No generative AI — deterministic NLP only.

Use it for rewrite drafts, locale/boilerplate variants, and same-site cannibalization checks. Pair with SEO Change Diff when you need meta/canonical field changes instead of body similarity.

What are common questions about Duplicate Content Checker?

How is similarity calculated?

A weighted mix of token Jaccard, bigram Jaccard, and trigram Jaccard. Exact normalized text match scores 100.

Can I paste text instead of URLs?

Yes. Send textA and textB, or use the Text mode in the browser tool. Do not mix URL and text modes in one request.

Does this detect paraphrases?

No. It is lexical (tokens/n-grams), not semantic paraphrase detection.

What does the report grade mean?

The grade favors uniqueness (100 − similarity). Higher uniqueness means lower duplicate risk.

Is AI used?

No. Fetch/parse and n-gram heuristics only.

What are the key features of Duplicate Content Checker?

URL or text mode

Compare two pages or two pasted drafts.

N-gram overlap

Shared bigrams/trigrams highlight reused phrases.

Uniqueness score

Report grade favors lower duplicate risk.

Problems & fixes

Severity-ranked guidance with exact technical terms.

How do you use Duplicate Content Checker?

Choose URLs or paste text

Use public HTTPS pages or draft body copy.

Review similarity and shared n-grams

Spot near-duplicates and boilerplate overlap.

Rewrite or canonicalize

Differentiate copy or consolidate with canonical/redirects.

Related tools

Use SEO Change Diff for field-level meta/heading/schema changes. Use Competitor Page Compare for scored feature gaps vs another domain.

Where do you browse more digital tools tools?

Related tools

Popular in Digital Tools

Which toolkits include Duplicate Content Checker?