ShellNewHandler VS OpenAnyDoc

OpenAnyDoc's answer:

The file never leaves your computer, and you can check it: open your browser's DevTools, Network tab, drop a 50 MB file, and no request appears. The site's security policy forbids any request to another server, and an automated test fails the build if any page tries one. Most online viewers and formatters upload your file first. OpenAnyDoc is also fully bilingual, English and Arabic, with right-to-left layout and Windows-1256 detection for older Arabic files.

OpenAnyDoc's answer:

Because it opens and edits the file without uploading it, without an account and without tracking, and still does the real work: CSV with delimiter and encoding detection, search, filter, sort and cell editing on 100,000+ rows; Excel workbooks (xlsx, xls, xlsm, ods) with recalculating formulas, number formats, merged cells and cell styles; JSON with tree, table and text views, a validator that names the line and column of an error, and a repair tool; TXT with encoding and line-ending choices. Everything downloads back in the same format. The code is open source (MIT), so anyone can read how it works or host a copy inside their own network.

OpenAnyDoc's answer:

People who receive data files and need to open, check or fix them quickly without the right software or without the permission to upload them: finance, operations and support staff handling exports, developers and analysts looking at JSON and CSV, and Arabic-speaking users whose CSV files show broken text in Excel. Also organisations with a no-upload policy for customer data.

OpenAnyDoc's answer:

TypeScript, React 19, Vite and Tailwind CSS v4. Pages are prerendered at build time and hydrated in the browser. CSV: PapaParse with TanStack Virtual for the table. Excel: SheetJS and ExcelJS, plus a formula parser that recalculates after edits. JSON: the browser's own parser with big-integer support. Hosted on Cloudflare as a Worker with static assets; the privacy tests run in headless Chrome over the DevTools protocol.

OpenAnyDoc's answer:

At work I kept seeing colleagues paste customer files into online viewers and formatters that upload them, just to look at a CSV or a workbook. Every one of those tools makes a privacy promise you cannot verify. I built OpenAnyDoc so the promise is enforced by the browser itself: the page is static, the security policy blocks outside requests, and the test suite drives a real browser and fails on any network call or storage write. The first version shipped in October 2026 in English and Arabic, because the Arabic encoding problem in Excel was the most common complaint I heard.