The tool
What the Gemini passive voice fixer does
You paste text, press Rewrite, and get the passage back with passive constructions turned active where that works. The output is the rewritten text and nothing else: no marked-up copy, no list of what changed, no percentage of passive sentences.
That is worth knowing before you start, because several tools on this search do the opposite. Sapling's passive voice checker detects rather than rewrites, taking each sentence and outputting whether it is passive along with the passive auxiliary. Grammarly underlines passive sentences where you are writing. This one returns clean prose, which means comparing the result against your original is on you.
The premise
Passive voice is not a grammatical error
Most converter tools treat every passive sentence as a defect to be removed. It is not. Grammarly, which sells a passive voice checker, says so on its own page: "Passive voice isn't a grammatical mistake, but it tends to make your writing unclear and hard to follow."
Grammarly goes further and names the cases where the passive wins, saying it does a better job "when the performer of the action is very general, unknown, or should get less emphasis." That is a description of an enormous amount of ordinary writing, including most reporting of findings and most description of processes.
So treat the tool as a drafting aid rather than a rule enforcer. It converts what you give it. Deciding which sentences to give it is the part that requires you.
How to
How to change passive voice to active in three steps
Purdue OWL's procedure is the reference every teaching page in this search echoes, and it is worth knowing by hand even when a tool is doing the work.
- Step 1. Find the actor
- Purdue puts it as: find the agent in a by-the phrase, or consider carefully who or what is performing the action. Sentences with a visible by phrase are the easy ones and convert cleanly.
- Step 2. Make the actor the subject
- Move the agent into the subject slot and change the verb to match. Mistakes were made becomes we made mistakes, which is Purdue's own example and shows exactly what the passive was hiding.
- Step 3. Read the result against the original
- Paste the passage here, press Rewrite, and compare. Check that no actor was invented, which is the subject of the next section. You get 5 runs per rolling 24 hours.
The risk
What an automatic passive voice fix can get wrong
Purdue's procedure contains a third step that is easy to skip past: "Sometimes you will need to infer the agent from the surrounding sentences which provide context." Inferring an agent is a judgement call, and a rewriter making that call at speed across a whole passage is supplying information your source never contained.
The clearest illustration comes from a Just Publishing Advice article on when not to convert. Take "The house was burgled." Forced into the active it becomes "A burglar burgled the house", which is both clumsy and an assertion: it says a burglar did it, when the original sentence deliberately did not name anyone.
This matters most in reporting, incident write-ups, scientific method sections and anything legal, where the absence of a named actor is the point. So read the output for new subjects. If a sentence now says who did something and your original did not, that is not a style fix, it is a new claim.
The exceptions
When to keep the passive voice
Just Publishing Advice sets out three cases and all three are common. The actor is irrelevant: "Markus was born in 1923" is a sentence about Markus, and nobody wants it to be about the people present at the birth. The actor is redundant: "Two burglars were arrested" does not need "by police" bolted on, because who else would it be.
The third case is general truths and idioms, where the passive carries a settled, authoritative quality that the active version loses. The same article notes that "In business, technical, and academic writing, there is more scope to use the passive voice", which is where most people needing this tool actually work.
Its blunt summary is the best advice on this search: "Don't let your writing become unnaturally contorted just to satisfy a grammar checker."
The number that does not exist
There is no correct passive voice percentage
Writing tools have trained a lot of people to aim for a number, and no source in this search publishes one. The Just Publishing Advice article declines to give a threshold at all, arguing for contextual judgement instead. Grammarly names situations rather than a figure.
This tool prints no number either. It does not count your passive sentences, does not score the passage and does not tell you what proportion changed. That is a limitation if you wanted a metric, and it is deliberate: a passage at twelve percent passive can be worse than one at thirty, depending entirely on which sentences they are.
If you need a count, a detector is the right tool for that job and this is not one.
The blunt question
Does removing passive voice make writing better?
Sometimes. Active sentences are usually shorter, name who is responsible, and put the action early where a reader finds it. On a page of bureaucratic prose the improvement is obvious and immediate.
But a wholesale conversion is not an improvement, it is a different set of problems. Forced actives produce sentences that state things your source did not, repeat obvious agents, and jar where the passive was carrying emphasis correctly.
The practical approach is selective. Run the paragraphs where you can feel the prose going slack, read the output against the original, and keep the passives that were doing a job. The tool has no opinion about which is which, and you do.
In practice
Who uses the Gemini passive voice fixer, and when
People writing in institutions, mostly. Policy documents, internal reports, procedure notes and academic drafts accumulate passive constructions because no individual wants to be named as the actor, and the result reads as though nothing was done by anyone.
Also students working against a marker's feedback, copywriters tightening a page that reads limply, and non-native English speakers whose first language uses the passive more freely than English does.
One group who should be careful: anyone writing incident reports, legal summaries or method sections. The passive is often load-bearing there, and the previous sections explain why.