AI detector. AI humanizer. Advanced Scan. Authorship Verification. Nearly 100% accurate. The web is full of impressive labels attached to a box that asks you to upload your work.

resnoop is the nosy alternative. Drop in a file and it makes that file talk — on your machine, inside your browser, without sending the document anywhere.

Yes, it really runs locally

No account. No upload. No remote analysis API quietly receiving your novel, contract, photograph or half-finished manifesto. The analysis engines run on your device.

Even the import libraries are bundled with resnoop and work locally. Word, PDF, EPUB, HTML, RTF, CSV, XML, Markdown and plain text are opened in the browser; ZIP archives are mapped without first being unpacked onto your disk.

The website delivers the application. After that, your processor does the snooping. Clear the session and resnoop forgets the file because it was never a file repository in the first place.

A file is more than its filename

Extensions can lie. resnoop checks the file signature, calculates its SHA-256 hash and looks at what is actually inside: metadata, Content Credentials, hidden characters, document structure, decoded pixels and writing patterns.

It does not flatten all of that into one mysterious percentage and hide the workings. The clues stay visible, including the awkward ones that disagree with each other.

Put text under the microscope

For Italian and English prose, resnoop builds a deterministic writing profile and places it on a Human-like → AI-like scale. It measures rhythm, repeated openings, recurring wording, punctuation, formulaic transitions, entropy, predictability, redundancy, compression, Zipf fit, character n-grams, sentence-length behaviour and changes between neighbouring sections.

Long documents are not fed to an average-shaped blender. Their headings and sections become anchors, so you can see where the voice is stable, where it shifts and which passages pull the overall result.

The number is a compatibility index, not a confession. Formal prose can look generated; edited AI text can look human; translation, genre, quotations and broken extraction can move everything. When the evidence is not good enough, resnoop says so.

Then do something useful with it

If the text is yours, edit the Markdown and recalculate immediately. resnoop keeps the before-and-after measurements so you can see whether the prose actually changed or merely swapped one tic for another.

It can also build a humanization prompt from the measurements it has already calculated, giving an editor precise revision priorities without pretending that another model can determine authorship.

Short documents can travel inside the prompt. Long ones become a guided block-by-block session. The model gets the diagnostics; the final editorial choices remain yours.

Images have two different stories

Provenance is what the file declares. If C2PA Content Credentials are present, resnoop reads the manifest locally, checks the content binding and signature it can verify, and shows exactly which checks were and were not completed.

Pixels are what survived. Entropy, contrast, colour, edges, residual noise, repeated blocks, compressibility and frequency energy describe the visible surface. They can reveal structure and transformation, but they cannot magically prove who — or what — made the image.

Need a shareable copy without the luggage? resnoop can produce a new PNG from decoded pixels only, leaving out EXIF, IPTC, XMP, GPS, Content Credentials and container metadata. Visible watermarks, naturally, remain visible.

The honest ending

resnoop can measure rhythm, predictability, formulaicity, entropy, redundancy, structure and anomalies. It can compare versions of the same text and show exactly what a transformation changed.

But the final leap — from this text has these properties to this text was written by AI — is not licensed by mathematics. A carefully prompted model, a thorough edit or an unusual Human voice can make provenance disappear from the surface.

These are powerful instruments, not a truth machine. The useful future may not be knowing who wrote a text, but seeing precisely how it was built and how it changed. Less spectacular than a verdict. More honest.

Never use this score alone to accuse, penalize or make decisions about a person. Authorship cannot be proven — or disproven — from the surface of a document.