HTML PDF JS Viewer

This tool provides a client-side viewer capable of rendering HTML, PDF, and JavaScript content from a URL or local file. It uses a sandboxed iframe for HTML to ensure isolation, a built-in PDF engine for PDFs, and a read-only display for JS code to prevent execution. Conceptually, it treats each format as a rendering surface that is driven by a single, consistent interface: inputs, render, inspect, and export when needed. Who benefits includes developers validating UI rendering, QA teams checking cross-format documents, and educators verifying published materials. Its unique value lies in unifying cross-format viewing in a privacy-preserving, offline-capable environment, enabling rapid format switching and page-level navigation without leaving the tool. Core features include source input via URL or file, automatic or explicit format detection, per-format rendering, and optional multi-pane comparison in advanced modes. Use cases include verifying that an HTML page mirrors its PDF export, validating embedded content across formats, and quickly surveying multiple documents during a project review. The tool emphasizes safety and data control by ensuring HTML rendering occurs in a sandbox and JS content is shown as read-only text. Core differentiators are client-side processing, strict format-specific pipelines, and the ability to compare formats side-by-side without server involvement.