Originality Checker

Originality Checker delivers exactly what its name promises, check writing for internal duplication, clichés, vocabulary richness & readability; runs in your browser (not a web scan), fast and free. Because it belongs to ToolsMonk's student tools collection, the whole workflow happens on a single page instead of being spread across separate apps or websites.

People reach for it most often when they need tightening a draft before submission by finding sentences you have accidentally written twice, catching self-plagiarism when you have reused paragraphs from an earlier assignment, and removing the stock phrases and filler that pad a piece without adding argument. With nothing to install, an unexpected one-off job takes no longer to start than your regular routine.

It is built for getting a real result on the first visit: no learning curve, no account, and the wider ToolsMonk toolbox close at hand.

The Originality Checker analyses one document against itself, entirely inside your browser. It finds sentences you have written twice in slightly different words, phrases you lean on, stock openings that pad a piece without arguing anything, and the readability level your writing lands at. It is a revision tool, and it is deliberately explicit about what it cannot do.

It does not search the web and it does not compare your work against a database of published papers or student submissions. That kind of source matching requires a licensed index and is what services like Turnitin exist to provide, normally through your institution rather than directly to you. Any free tool claiming to search the whole web for matches is worth treating with suspicion; this one tells you plainly that it does not.

What it does instead is often more immediately useful while you are still writing. Near-duplicate detection compares the words in each pair of sentences and reports any pair sharing 60% or more of their combined vocabulary, with the exact similarity shown so you can judge borderline cases. In practice the top of that list is usually a paragraph you rewrote and forgot to delete, or a point you made in the introduction and made again in the conclusion without noticing.

The repeated-phrase and stock-phrase checks target padding. Four-word sequences that appear more than once are often an unconscious tic; a set of well-known filler openings is matched separately, because those are the phrases that cost you credit with a marker for saying nothing. Lexical variety, the share of your words that are distinct, is reported alongside, and is only used against the score on shorter pieces, since any long document reuses ordinary words by necessity.

Readability is reported through six published indices rather than one, because each weighs different things and no single number is authoritative. Flesch Reading Ease and Flesch-Kincaid use syllables per word; Gunning Fog and SMOG count words of three or more syllables; Coleman-Liau and the Automated Readability Index work from characters and therefore act as an independent cross-check on the syllable counting. SMOG is shown but excluded from the composite average on anything under thirty sentences, because that is the sample size it was defined on.

Because everything runs on your own device, nothing you paste is uploaded, stored or logged. That matters most for exactly the work you would hesitate to paste into an online service: unpublished coursework, a dissertation under embargo, or a manuscript in review. Close the tab and the text is gone.