Is there a size limit?

It depends on the plan: 25MB on the free tier, 200MB and up on paid tiers, and no scan quota at all in the Windows app for paid members (Pro or above).

What if I submit something not listed?

As much as can be read is read, and whatever could not be is recorded in the coverage figure. We never pretend to have read something we could not.

Does HWP really work?

Both HWP and HWPX are read. Document properties and editing history are checked the same way as for any other document format.

Can I submit many files at once?

Yes. They go through a queue, each gets its own report, and the distribution of verdicts is shown together.

Supported file formats

Different formats keep different layers, so what you can expect differs too. Alongside what you can put in, this lists what tends to come out of it.

Images

PNG, JPEG, WEBP, TIFF, HEIC, GIF and BMP are read. PNG tells you most through the text chunks a generator leaves; JPEG through its quantisation table and thumbnail structure. Regions that look edited are marked on a heatmap.

Documents, writing and source code

Reads PDF, DOCX, HWP, HWPX, PPTX and XLSX alongside TXT, MD, RTF and CSV. Korean HWP was in from the start because it is what Korean offices actually use. In documents the questions are the authoring tool, the edit history, the revision sessions and whether the cited sources exist. In source code (Python, JavaScript, TypeScript, Java, C/C++, Go, Rust, HTML, CSS and more) style is not examined — comment density and naming are decided by linters and coding standards, so they cannot serve as evidence. What is counted instead is the generation marker a file declares about itself, and residue carried over from a chat window.

Audio and video

MP3, WAV, FLAC, OGG, OPUS, M4A and AAC, plus MP4, MOV, WEBM, MKV and AVI. Container information, encoding history, waveforms and frames are analysed. No deep detection model is included yet; when one is, its limits will be published with it.

Archives and pasted text

A ZIP is opened and each file inside scanned separately, with the results grouped. You can also paste text straight into the scan box, where the limits of stylometry apply in full.

Frequently asked

Is there a size limit?: It depends on the plan: 25MB on the free tier, 200MB and up on paid tiers, and no scan quota at all in the Windows app for paid members (Pro or above).
What if I submit something not listed?: As much as can be read is read, and whatever could not be is recorded in the coverage figure. We never pretend to have read something we could not.
Does HWP really work?: Both HWP and HWPX are read. Document properties and editing history are checked the same way as for any other document format.
Can I submit many files at once?: Yes. They go through a queue, each gets its own report, and the distribution of verdicts is shown together.