Useful data tools with an honest boundary

Product principles

Core file processing happens in a dedicated browser worker. Detection confidence and file limits stay visible, automatic repairs are reversible, and an export is blocked when the complete result cannot be retained safely.

What it is not

The project is not cloud storage, collaborative spreadsheet software or a promise that every browser can open files of unlimited size. Optional server features will be clearly labeled if they are ever introduced.

Testing

Releases are checked with synthetic fixtures covering delimiters, multiline fields, inconsistent rows, leading zeros, nested JSON and international text. Product limits are updated only after browser testing.

How the tools are designed

Each landing page focuses on one concrete task so the controls, explanations and export choices match the result a visitor expects. The explanatory page is delivered as static HTML, while the interactive workbench loads separately. This keeps the instructions readable even before the application starts and avoids turning the site into a list of unrelated utilities.

How to verify important output

Keep the source file unchanged, compare reported row and column counts, and inspect known edge cases before using a converted file in another system. A successful download means the browser completed the requested export; it does not replace validation against the destination application's requirements.