Privacy Policy

Last updated: September 2026

The short version

Your spreadsheet files never leave your device. All parsing, previewing and Excel/CSV generation happen locally in your browser. Our servers never receive the files, any cell value from them, or anything you type into the tool.

What we do NOT collect

• Your .numbers files — they are read by JavaScript running in your browser tab and are never uploaded.
• Spreadsheet content — sheet names, cell values, formulas and the generated .xlsx/.csv files stay in your browser's memory and are discarded when you close the tab.
• Accounts and cookies — the site has no signup, and it sets no cookies.

What is stored on your device

If you purchase and activate a license, the license key and its activation timestamp are stored in your browser's localStorage (key numbersconvert_license) so you don't have to re-enter it. Clear your browser's site data at any time to remove it. Nothing else is persisted.

What is sent over the network

• Page loads. The site is static files served by our hosting provider (Vercel). All JavaScript libraries are self-hosted on the same domain — no third-party CDN is contacted. Like any web request, the hosting provider may log your IP address and user agent per its own privacy policy.
• Anonymous usage statistics. We use Vercel Web Analytics, which counts page views and referrers without cookies and without collecting any file or personal data.
• Anonymous usage counters. Our server keeps running counts of tool events: files were parsed (count and byte size only), an export happened (file count, single or batch), and client-side error codes. These are bare numbers — they never include spreadsheet content or file names.
• License validation (paid users only). When you enter a license key, the key — and only the key — is sent to our serverless endpoint, which forwards it to Gumroad's license API to confirm validity. No spreadsheet data is ever attached to this request.
• Checkout (paid users only). If you buy a license, the transaction is handled by Gumroad under their privacy policy. We receive only an order confirmation and your email address for license delivery.
• Feedback you choose to send. The Feedback link opens a form delivered by Web3Forms: only the text you type and, if you fill it in, your reply email address are sent. Never attach or paste your spreadsheet content — we cannot use it and do not want it.

Data retention

Your spreadsheet data is never sent to us, so there is nothing for us to retain or delete. Anonymous usage counters (numbers only, as described above) are kept as daily aggregates and lifetime totals. License and order records are retained by Gumroad as required for accounting purposes.

Changes to this policy

If we ever change how data is handled, we will update this page. Any feature that would require sending file content to a server (we have none planned) would be opt-in and clearly marked before it affects you.

Contact

Questions about privacy? Email hello@numbersconvert.com or reply to your Gumroad receipt.