Passive Voice Checker
Highlights passive sentences in real time with a live percentage gauge. Pro Mode adds active-voice rewrite suggestions, a Flesch readability breakdown, batch document processing, and academic vs creative writing profiles.
Drop multiple .txt or .md files here, or tap to browse
Academic profile relaxes the gauge thresholds since passive framing is standard in scientific writing. Creative profile tightens them, since active voice reads more punchy.
Rule-based, not AI: we can only auto-rewrite sentences with an explicit "by [agent]" clause. Others get flagged with a manual tip instead.
How to Use the Passive Voice Checker
From a blank box to a polished, direct draft — no signup, nothing ever leaves your browser.
Everything above runs entirely in your browser — your text is never uploaded to a server, so it stays completely private from start to finish.
Passive Voice Checker — Free Online Tool with Live Gauge
A passive voice checker scans your writing sentence by sentence, highlights each passive construction, and shows a live percentage so you can see how much of your text leans passive at a glance. This one updates as you type, runs entirely in your browser, and never uploads your text to a server.
Passive voice isn't a grammar error — sentences like "the bridge was built in 1932" are perfectly correct, and passive constructions are often the right call when the person doing an action is unknown, unimportant, or deliberately left out. The problem is overuse: when most of a page reads "mistakes were made" instead of "we made mistakes," writing gets vaguer, wordier, and harder to follow. This passive voice checker online tool flags every instance live as you type, and Pro Mode extends it into rule-based active-voice rewrites, a Flesch readability breakdown, batch processing for multiple documents, and writing-context profiles that adjust what counts as "too much" passive voice for academic vs. creative writing.
1Simple vs Pro — What Each Mode Includes
| Feature | Simple Mode | Pro Mode (Free) |
|---|---|---|
| Live passive-voice percentage gauge | ✓ | ✓ |
| Sentence highlighting in your text | ✓ | ✓ |
| Word, sentence, passive & active counts | ✓ | ✓ |
| Upload TXT, DOCX, PDF, MD or RTF files | ✓ | ✓ |
| Rule-based active-voice rewrite suggestions | — | ✓ |
| Flesch readability breakdown | — | ✓ |
| Academic / Business / Creative writing profiles | — | ✓ |
| Multi-document batch processing | — | ✓ |
2Common Reasons People Check for Passive Voice
Plain-language advocates in government writing push hard against unnecessary passive voice for a specific reason: it lets a writer hide who's responsible for an action. "Your request will be answered" reads politely, but it also quietly avoids naming who's doing the answering. The U.S. National Archives' own plain-language writing guidance makes this exact point — that active voice communicates with the reader more clearly, quickly, and honestly.
3The Zombie Test — A Quick Manual Check
If you want to spot-check a sentence without a tool, there's a well-known trick: add the phrase "by zombies" right after the verb. If the sentence still makes grammatical sense, it's passive. "The form was processed (by zombies)" works, so it's passive. "She was feeling (by zombies) tired" doesn't make sense, so it isn't passive at all — just a state-of-being verb that looks similar. The test is popularly credited to Rebecca Johnson of Marine Corps University and shows up in plain-language training precisely because it's fast and memorable, even if an automated checker like this one is more reliable for longer documents.
| Context | Typical Passive Voice Share |
|---|---|
| Web / blog / marketing copy | Under ~10% — direct, active phrasing reads more persuasive and scannable |
| General business writing | ~10-15% — occasional passive is fine, especially for outcomes over blame |
| Academic / scientific writing | Higher tolerance — passive voice is often the convention to keep focus on results, not the researcher |
Every scan, highlight, and Pro feature — including the active-voice rewrite tool and batch processing — runs entirely in your browser using JavaScript. Nothing you type is ever sent to a server.
4Frequently Asked Questions
Grounded in official and established writing guidance — the case for active voice follows the U.S. National Archives' plain-language writing tips, and the "zombie test" background draws on Mental Floss's explainer on passive voice detection.
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