Privacy

MergeStudio is designed to keep normal spreadsheet jobs on your device and to tell you where processing will happen before any future cloud upload occurs.

Spreadsheet files

Before local parsing starts, MergeStudio checks the selected file sizes and estimates whether the job is safe for the browser. Local jobs are transferred to a background worker within your browser and remain on your device.

Very large jobs

The cloud-processing backend is not connected yet. If MergeStudio determines that a job is too large for safe local processing, it stops before parsing and clearly says that cloud processing would be required. The current production tool does not upload that oversized job anywhere.

If temporary cloud processing is enabled in the future, the tool will identify that mode before upload and this policy will be updated to describe storage, retention and deletion behavior.

Downloads

For local jobs, the merged workbook is generated inside the browser and downloaded from an in-browser object URL. The result does not need to be stored on a MergeStudio server.

Hosting

The public website can be served as static files from Vercel. Like most web hosts, Vercel may process ordinary request metadata needed to deliver the website, such as IP address, user agent, requested URL and timing information. This is separate from the spreadsheet contents selected inside the tool.

Third-party assets

The site may load external web assets such as fonts or the SheetJS browser library from a CDN. Those providers may receive normal web request metadata when those assets load. Spreadsheet contents are not intentionally included in those requests.

Practical limits and safeguards

Browser memory varies by device. MergeStudio therefore uses conservative safety checks for raw file size, estimated working memory, worksheet size and result growth. A job may be stopped even when a powerful computer could technically complete it; this is intentional to reduce the risk of a frozen or terminated browser tab.

Accounts and retention

• No MergeStudio account is required to merge files.
• Local-processing spreadsheet contents are not retained by MergeStudio.
• Starting over, refreshing or closing the page clears the in-memory working state.