Free AI Checker Tools
Free AI checker tools for text, image and PDF: find invisible characters, compare text with AI-written examples and protect names, figures, links and quotations.
AI tools · Browser and platform
Free AI checker tools
Free AI tools for text, images and PDFs: Opace's free AI checker tools show measured accuracy, protect key facts and read signed origin evidence in your browser or your platform.
AI collection
Choose your free AI checker tools by workflow.
Free AI Content Checker
Check text in the browser with this free AI content checker, view each result separately and download a hash-only receipt.
Free AI Image & PDF Checker
Free AI image and PDF checker: read signed Content Credentials and declared metadata in your browser. Evidence, not a pixel guess.
AI Watermark & SynthID Checker
Run the published SynthID watermark calculation in your browser with three public Opace test keys.
Free AI Checker for Astro
Check rendered pages in the Astro Dev Toolbar or add report-only checks to builds with this free AI checker for Astro.
Free AI Checker Chrome Extension
Check selected or pasted text locally with this free AI checker Chrome extension: no host permissions, analytics or remote code.
Free AI Checker CLI & Local Service
Run this free AI checker CLI from a terminal, return JSON or connect an authenticated local service.
Free AI Checker WordPress Plugin
Check posts in WordPress with this free AI checker WordPress plugin and save a hash-only receipt only when you choose.
AI Detector Methodology
Read the evidence model, method states, limitations and privacy rules behind these AI detector tools.
Start with the free AI content checker, use the AI watermark lab to compare public test keys, or read the AI detector research. These AI detector tools also run as WordPress, Astro, Chrome and CLI checkers.
Opace tools
Use the checks in your browser, WordPress, Chrome, Astro or the command line.
Each page focuses on a specific workflow, from pasted text and selected page copy to WordPress drafts, Astro builds and terminal output. Open the relevant page to compare its checks and privacy controls.