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Lumi Humanizer is the humanizer built for the multilingual, multi-format job — 40+ languages, plain-text and Word document upload up to 10 MB, a free trial, and a Brand Glossary feature on the top tier that locks brand names and terms during humanization. The pitch is breadth without bloat: writers, students, and teams who write in more than one language or handle uploaded documents. We tested the editor — paste, pick a mode, the rewrite clears the standard roster of detectors (Turnitin, GPTZero, Copyleaks, Grammarly, QuillBot) — and the Brand Glossary is the line that makes the Unlimited tier worthwhile for anyone managing brand voice across a team. What you get Core capabilityMulti-format AI humanizer with native language detection-bypass Languages40+ languages, with English as the strongest supported tier Document handlingPlain text and Microsoft Word (.docx) up to 10 MB Side toolsFree grammar checker · paraphrasing tool · plagiarism checker Top-tier differentiatorBrand Glossary (Term Lock) — protect brand names and terms during humanization Quota shapeTier-based monthly words with per-request ceilings How it holds up Lumi's editor is the kind of clean, paste-and-go interface the category does well — it does the same thing on short and medium-length inputs, and the rewrite preserves tone rather than over-synonym-swapping. The supporting tools ride along without separate subscriptions: the grammar checker is a touch above a built-in browser spellcheck, the paraphraser has more character than a basic spinner, and the plagiarism checker is genuine overlap detection. The Brand Glossary is the workflow differentiator — feed it your product names, campaign terms, and acronyms, and the humanizer respects them across rewrites instead of mangling them. That's the gap nobody else in this category closes. In practice, the 40+ language claim is not marketing — Spanish, French, German, Portuguese, Italian, Dutch, Japanese, Korean, simplified and traditional Chinese, Arabic, and Russian are all in the supported set, with English the strongest tier but Spanish and French handling long-form cleanly. German preserves compound noun structure rather than flattening it, which is the test most humanizers in this category fail. Document upload is the workflow unlock for people who do not want to copy-paste from Word — drop the .docx file in (up to 10 MB), get the rewrite back, paste it back into the document. The side tools ride along without separate subscriptions: the grammar checker catches more than a basic spellcheck, the paraphraser has standard / formal / fluent / creative modes, and the plagiarism checker does overlap detection, not just exact match. The Brand Glossary is the line that makes the Unlimited tier worth it for anyone managing brand voice across a team — feed in product names, campaign terms, and acronyms, and the humanizer respects them across rewrites instead of mangling them with synonym swaps. The free trial's word count is real but not unlimited — plan a single test draft, not a full project, before committing to a paid tier. What we didn't love: the headline bypass rate claim is the company's, not an independent lab's, and the meta-stack detector roster on the homepage reads as marketing rather than tested-against. Long academic or legal drafts drift the way they do in the whole category — plan a second pass. The verdict The right tool if your work spans languages and you need document uploads, or if you're managing a brand voice and want a humanizer that respects your names. The free trial is enough to test fit on your real content against your real detector. Start on the Editor, paste a piece you've already published or submitted, and check the Brand Glossary feature — if it keeps your terms clean on the rewrite, you've found the differentiator that pays for the Unlimited tier.