PDF Accessibility Checker is a free browser-local pre-check for people who need an early, explainable look at common PDF accessibility signals before a formal review. It is designed for PDF authors, educators, accessibility practitioners, developers, and document teams who want to identify obvious structural gaps without sending the document to an upload service.
The tool accepts one unlocked PDF up to 20 MB. Processing happens locally in the browser. The selected PDF, its filename, extracted text, hash, and local path are not sent to the server. This privacy boundary is useful when someone is working with internal drafts or documents that should not be copied to an external checking service.
The automated checks focus on machine-verifiable signals. They include whether the file exposes a document title and primary language, whether tags and basic structure are present, whether pages appear likely to be image-only, and whether links and form fields expose useful structural information. Results are presented with plain-language explanations and next-step guidance so that the user can understand why a signal matters.
The product is intentionally described as a pre-check, not a certification service. A successful automated result does not prove conformance with WCAG, PDF/UA, Section 508, or any legal requirement. Important questions still need human judgment, including reading order, the quality and purpose of alternative text, complex tables, color contrast, logical navigation, and the experience of people using real assistive technologies.
Scanned and image-only PDFs may need OCR before useful structure can be evaluated. OCR is not included. The tool also does not perform complete automatic remediation. Its purpose is to help users find common issues earlier, understand the limits of automated testing, and prepare for validation in Adobe Acrobat, PAC, screen readers, or another professional accessibility workflow.
A typical workflow is simple: open the public tool page, choose a PDF from the device, run the check, and review the resulting list of signals and manual-review reminders. The interface explains which findings came from automated checks and which areas remain outside the tool's scope. No account is required on the product site.
PDF Accessibility Checker is useful as a first pass during authoring, quality assurance, education, procurement review, or document handoff. It helps teams ask better questions before a formal audit while preserving a clear boundary between automated evidence and professional judgment. The free tool is available at the official website and is maintained with a public support channel for bug reports and questions.
