ReflowPDF

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ReflowPDF is a browser-based PDF editor with true structural reflow. Unlike tools that position text in fixed boxes, it builds real semantic document structure (tables, headings, lists), so editing content reflows the document like a word processor — add a table row and everything below repaginates automatically. It runs entirely in the browser with no software to install. The custom rendering engine is built from scratch with zero external dependencies — no headless Chrome or Node. Exports pass PDF/UA-1 and PDF/A-3a validation, making it suitable for accessibility compliance work (EAA, ADA Title II, EN 301 549). A key feature is round-trip editing: the editable source is embedded directly inside the exported PDF, so the file you download is the same file you reopen to keep editing — no server-side document storage required. There is an open demo with no signup required. Built for translators and localization teams, accessibility compliance teams, and regulated SMBs (bookkeepers, accountants, paralegals).