Privacy

Last updated 13 November 2026

Chart to Data reads charts and gives you their numbers. This page says what happens to what you send, in plain words. Chart to Data is run from Ontario, Canada, and can be reached at support@charttodata.com.

The files you upload

• A file you upload is sent to our server, read, and deleted as soon as the reading ends. We do not keep it, and we do not keep the numbers read from it.
• A file larger than 4 MB is first put in private storage that only our server can read. It is deleted from there as soon as it has been read, and storage removes it by itself within a day if a read never finishes.
• The result lives in your browser. When you download the Excel file, your browser sends the numbers back, the file is made, and nothing is stored.
• A PDF that holds its chart as a drawing is read on our server by our own program. It is not sent to anyone else.
• A picture of a chart (an image, a scan, a screenshot, a photo, or a PDF page that is a picture) is sent to Anthropic, whose AI model reads it. Anthropic handles it under its own terms for business customers. Do not upload a picture you are not free to share with a service like that.

What we keep

• A count of picture reads. To limit free picture reads to one a day, we store a scrambled form of your internet address with the date. It cannot be turned back into the address, and it is deleted within a few days.
• A record of each picture read: the time, which model read it, how much text went in and out, and what it cost. It holds nothing from your file and nothing about you.
• A count of visits. The site counts page views with Vercel Web Analytics: the page, the site you came from, roughly where you are (country, region, city), and your kind of device and browser. It uses no cookies. Vercel tells one visitor from another by a scrambled value made from the request, which it discards after 24 hours, so a visit cannot be followed from day to day or to other sites.
• A count of what the site was used for. The same counter is told that a file was read, whether it was a PDF or a picture, and how it went (read exactly, read from the picture, nothing found, and so on); that a table was downloaded; that a reading was put right by hand; and that a pack was bought. Nothing from your file goes with it: no name, no numbers, no page. We use it to see what the reader fails on.
• Server logs. The company that hosts the site (Vercel) records each request: the time, the page, and the internet address it came from. It keeps these for a limited time under its own policy.

Through an AI assistant

If you use Chart to Data through an AI assistant (our connector), the assistant sends us the web address of a PDF. We fetch that file, read it with our own program, and delete it as soon as the reading ends. We do not receive your conversation. To limit use we count these requests against a scrambled form of the calling internet address, as described above, and our host’s log keeps for a short time the kind of request and whether it worked, never the address of the file.

If you buy picture reads

• You pay on a page run by Stripe, our payment company. Stripe takes your card and your email address and handles them under its own policy. Your card never reaches this site.
• We keep a scrambled form of your code (not the code itself), how many picture reads were bought on it, when each one was used, and Stripe’s reference for the payment. None of that says who you are.
• Your code is kept in your browser’s storage on your own device, so that you do not have to type it each time. “Forget it on this device” removes it. It is also printed on your receipt from Stripe.
• If you write to us about a payment, we find it in Stripe by the email address you paid with.

What we do not do

• There are no accounts, so we hold no name, email address or password.
• The site sets no cookies and runs no advertising. The only counting is what is described above.
• We do not sell or share anything about you.

If any of this changes, for example if accounts or payment are added, this page will change first.

Your rights

Depending on where you live, the law may give you the right to ask what is held about you and to have it deleted. Because we hold so little, the honest answer will usually be that nothing can be tied to you. Write to support@charttodata.com and we will answer.