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Check selected text, pasted text or a page for AI writing in 39 languages. See the score and language with humanize.fast. Human or AI? Check before you share. An article worth a closer look. A social post that sounds too polished. A passage you want to double-check. humanize.fast helps you inspect what you read, right where you read it. Powered by Pallas, the same AI text detector used on humanize.fast, the extension gives you a clear classification, an AI score and the detected language — together in a simple side panel. CHECK TEXT IN THREE WAYS • Highlight a passage, right-click and choose “Check for AI with humanize.fast”. • Paste your own text into the extension. • Choose “Check this page” to inspect the page’s main text. Text detection supports 39 languages. Each check handles up to 2,000 words, and free accounts receive the same rounded scores as on the website. TAKE A CLOSER LOOK AT YOUR FEED Enable post checks on LinkedIn, X, Reddit, Medium or Substack. New posts receive a clear Check for AI button as you scroll; nothing is analyzed until you click it. See a breakdown of the posts you chose to check, filtered by platform. It reflects your checked sample, not everything in your feed. Stop the per-post controls whenever you want. CHECK IMAGES, TOO Upload a JPG, PNG, WebP or GIF up to 10 MB. See the AI-image estimate alongside metadata findings, such as a generator tag when one is present. The website’s existing image allowance applies. LOOK UP YOUR SOURCES Paste up to five references or DOIs to look up publication details in Crossref. Review found DOI records and possible matches side by side with your original references. A record confirms a source exists; it does not verify a claim. KEEP USEFUL READINGS Reopen recent account checks without running another detection. Copy a report or save it as a text file with the displayed score, classification and language. CONTINUE ON HUMANIZE.FAST Want to work on the wording? “Fix this with humanize.fast” opens the website’s humanizer with up to 4,000 characters prefilled. Rewriting happens on the website under its usual plan rules. GET STARTED Install, pin the extension and connect your humanize.fast account. Free accounts can use their included detection allowance; paid plans provide more. The extension uses your existing account allowances. YOU CHOOSE WHAT TO CHECK Page and post checks start only when you request them. The extension does not type or rewrite for you, and includes no advertising or analytics SDK. See our privacy policy for processing and account-history details. AI detection is an estimate, not proof of authorship. Questions or feedback? https://humanize.fast/contact