Best multilingual AI humanizer

Vendors make three kinds of language statement: a full named list, a count with a few examples, or a count alone. A fourth group says nothing about the humanizer and offers the website in several languages, which is a different thing. The table orders the 13 by the longest named list, then by stated count. Every figure is the vendor's own, read on 9 November 2026 unless a different date is given.

Which vendors name which languages?

The six languages below are the ones people most often pair with "AI humanizer" in search. "Named" means the language is in the vendor's own list; "count only" means a number and no names; "not in list" means a closed list that leaves the language out; "interface only" means the website is offered in that language and the vendor says nothing about the humanizer.

Three vendors, Undetectable AI, Netus AI and HIX Bypass, name all six. Undetectable AI's list is the one to read in full, because the vendor labels the whole list "secondary" and says its primary focus is English (Undetectable AI, AI Humanizer page, read 9 November 2026). HIX Bypass states "50+ Languages Supported" on each plan card and names 35 on its homepage (HIX Bypass pricing, read 9 November 2026), so 15 or more of its claimed languages are unnamed.

What does the research say about humanizers and detectors outside English?

Two published findings bear on anyone working outside English. Weber-Wulff and colleagues tested 14 AI text detectors in 2023 and found every one below 80 percent accuracy, with accuracy falling further on text that had been paraphrased or machine-translated (Weber-Wulff et al. 2023, International Journal for Educational Integrity, read 9 November 2026). A text translated into English and then humanized has been transformed twice before a detector reads it.

Liang and colleagues ran 91 TOEFL essays by non-native English writers through seven GPT detectors, which flagged 61 percent as AI-written on average, while essays by US eighth graders were classified almost perfectly (Liang et al. 2023, Patterns, read 9 November 2026). The authors tied the gap to lower measured vocabulary variety, the same signal that a humanizer changes. No detector score should be the only evidence in a misconduct case, and that holds twice over when the writer's first language is not English.

The published method weights meaning kept at 35 of 100 points, errors added at 20, detector pass at 30 and limits and access at 15, on an English input set. A non-English series would be a separate input set, with raters who read the language, and a separate run; this page will carry its figures when one exists.