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Privacy by architecture

Private AI Detector that Runs Entirely in Your Browser

Check sensitive text with no upload, no account, and nothing stored.

No sign-up No limits 100% in your browser Instant & free
Related: AI Content Detector · How AI Detection Works
Try it on a known sample — we already know what each one is:
Paste your text here to analyze it. Use at least 40 words for a reliable read.
Likely human Mixed Possibly AI Likely AI

Probability, not a verdict. Colors show per-sentence signals, not accusations.

Words: 0/5000

By using our detector, you agree to our Terms.

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of text is likely AI
Human vs AI, across the passage
Human written AI generated
Awaiting text
Paste a passage to begin
Your result and the reasoning behind it will appear here after you run a scan.
AI-generated0%
Human-written0%
AI-refined0%

Astra AI Detector shows probability, not proof — no AI checker is 100% accurate.

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01Privacy by design

A private AI detector that never sees your text

The analysis runs on your device, so your text is never uploaded, stored, logged or used for training.

Most AI detectors send your writing to a server to be analyzed, and many make you create an account first.

Independent guides are blunt about the risk: some tools store submitted text, and several reserve the right to use it to train their models — often buried in the terms of service. Astra is a private AI detector built the opposite way: the analysis runs on your own device, so your text is never uploaded, stored, logged or used for training. No sign-up, no login, nothing kept.

Never UploadedStoredLoggedUsed for training

Paste or upload above and check as much as you like — it's a safe choice for sensitive, confidential or unpublished writing you'd rather not hand to a third party.

02Proof

How we know it's private

The detection model loads and runs client-side — and you can verify it yourself.

It runs in your browser

The detection model loads and runs client-side. Your text is processed locally on your device — not on our servers.

Verify it yourself

Open your browser's developer tools and watch the Network tab while you run a check: your text isn't sent anywhere. You can even disconnect from the internet after the page loads.

Nothing stored, nothing trained

No account, no upload, no logging, and your text is never used to train anything. Close the tab and it's gone.

03Offline

Works offline, by design

Astra keeps working after the page loads, even with no connection.

Because the analysis was never happening on a server, Astra keeps working after the page has loaded even if you go offline.

That's not a gimmick — it's proof of where the processing happens.

A tool that stops working without a connection is sending your text somewhere; Astra isn't.

04Server-side

What other AI detectors do with your text

Server-side detectors upload your writing — and their retention policies vary widely.

Server-side detectors upload your writing to be analyzed, and their policies vary widely.

Some popular free tools state that submissions may be used to improve their models; others store text as “customer data” unless you opt out; a few explicitly discard it after analysis. That may be fine for public content, but it's a real concern for drafts, client work, legal or medical text, and anything under NDA.

Astra removes the question entirely by never receiving your text in the first place — as the guides put it, if a free tool has no clear business model, your data may be the product.

05Compliance

Confidential, client and student work

Nothing leaves the browser, so sensitive material never becomes a data transfer.

Because nothing leaves the browser, Astra suits sensitive material — unpublished manuscripts, legal or medical drafts, internal reports, and student work.

It matters for compliance, too: a student essay is personal data, and pasting it into a server-side tool is a data transfer that may need a proper agreement.

A detector that stores nothing sidesteps that problem, making Astra a practical no-signup, no-storage AI checker you can use without creating a data trail.

06Learn more

Read the details

Go deeper on the method and the privacy guarantees.

See exactly how the analysis works on how AI detection works, or read our privacy policy.

07Before you paste

How to check any AI detector is safe before you paste

Before you hand any tool a draft, a few quick checks reveal where your words actually go.

Run these checks on Astra and on any competitor. The point is not to trust a claim but to confirm it for yourself.

Read the fine print for storage words

Search the privacy policy and terms for store, retain, process on our servers, improve our models and training. If a tool reserves the right to keep or learn from submissions, assume it will.

Check whether it forces an account

A required email, login or payment is a way to tie your text to your identity and keep it. No sign-up means there is nothing to attach your writing to.

Watch the Network tab

Open your browser's developer tools, open the Network panel, and run a scan. If you can see your text inside a request body leaving the page, it went to a server; if nothing is sent, the work happened locally.

Try it with the internet off

Disconnect after the page has loaded and scan again. A genuine browser tool still works; a cloud tool fails, because it needs to reach a server to read your text.

Astra is built so every one of these checks passes by design: no account, no request carrying your text, and full functionality offline. Even so, you should never take that on faith — use the same checklist on us that you would on anything else you paste sensitive writing into.

08Local vs cloud

Browser-based vs cloud AI detectors: what actually changes

"Runs in your browser" and "runs in the cloud" are two different stories about your data.

Both approaches return a score, but they handle your text in opposite ways. Here is the honest trade-off.

Browser-based (local, offline-capable)

the analysis is done by code and a model file already downloaded to your device. Your text is read in memory, never uploaded, and the tool keeps working with the connection off. Because the model has to run on your own machine, it is a lightweight heuristic that returns a probability, not proof — and it needs no account.

Cloud-based (server-side)

your text is sent over the internet to the vendor's servers, scored there, and a result is returned. The vendor can run heavier models, but now holds a copy of your writing that is subject to their retention rules, their training policy and their breach exposure — and usually a login.

Neither approach makes a detector infallible; both are estimates. What differs is the cost of getting that estimate. A cloud tool trades your privacy for more compute; a browser tool like Astra trades some raw model size for a hard guarantee that your writing never leaves the device. For unpublished, confidential or client work, that guarantee is usually the better deal — and for public text you do not mind sharing, either can do the job.

09Security case

Nothing stored means nothing to breach

The safest place for a sensitive draft is a copy that was never made.

That is the whole security case for a browser-only detector, and it is worth spelling out.

When you paste into a cloud tool, your text becomes a record in someone else's system — application logs, database rows, backups, sometimes a training set. Every record is something that can later be kept past its usefulness, exposed if the vendor is breached, handed over under a legal request, or repurposed when a policy quietly changes. The moment your writing arrives on a server, that server's security becomes part of your own risk.

A browser-only tool removes the exposure at its source. Because Astra never receives your text, there is no server-side copy to leak, sell, subpoena or reuse — the kind of incident where one breach spills thousands of users' documents simply cannot include words that never left your browser.

One honest caveat: local processing protects your text from the tool's side, not from your own device. It does not encrypt your disk or guard your shoulder, so on a shared or managed computer keep the usual habits — lock your screen and mind what is already installed. What it does guarantee is that the detector itself adds nothing new to your attack surface.

10Questions

Privacy FAQ

What's stored, what isn't, offline use, and how to verify privacy for yourself.

Does pasting my text into a private AI detector make it public?

No. Nothing is published, posted or shared anywhere. With Astra the text is analyzed on your own device and is never sent to us, so there is no copy on any server that could be exposed or seen by anyone else.

Do I need to install an app or browser extension?

No. Astra is an ordinary web page that runs in any modern browser — no download, no extension, no app store. Open the page and it works, and it keeps working offline once it has loaded.

If it runs in my browser, can my school or employer see what I checked?

The scan happens locally, so no request carrying your text ever reaches Astra to be logged or shared. Be aware that monitoring or filtering software already installed on a managed device is separate from the detector and outside its control.

Is a browser-based detector as accurate as a cloud one?

Running locally does not make a detector more or less accurate — detection is probabilistic either way. Browser tools use lighter models, so whichever tool you use, treat the score as one signal rather than proof of who wrote something.

Do you store my text?

No. Text is analyzed in your browser and is never uploaded, stored or logged. Close the tab and it's gone.

Do you use my text to train anything?

No — your text is never used for training. Some other detectors reserve that right in their terms; Astra can't, because your text never reaches a server.

Do I need an account or login?

No account, no email, no payment — nothing to sign up for.

Is it safe to paste a confidential or unpublished document?

Yes — nothing is uploaded, so drafts, client copy and sensitive documents stay on your device. That's safer than server-side tools for anything under an NDA.

Does it work offline?

Yes — once the page has loaded, the detector keeps working without a connection, because the analysis was never happening on a server.

How can I verify it's really private?

Open your browser's developer tools, watch the Network tab while you run a check, and confirm your text isn't sent anywhere — or simply disconnect after the page loads.

Is it free?

Yes, completely free with no limits.

AI-generated
H
High Confidence