Privacy policy
Last updated 13 November 2026
- To read a chart, your screenshot is sent to Anthropic's Claude API. We don't store the image or the numbers.
- The table you edit and the files you download are made in your browser.
- We count how many charts each visitor reads per day using a one-way hash of the IP address, kept for two days.
- No accounts, no advertising and no tracking cookies.
What happens to your screenshot
When you add an image, your browser shrinks it if it's very large and sends it to our server, which passes it to Anthropic's Claude API (an AI model) to read the chart. The model returns the chart's type, labels and numbers; we check that reply and send it back to your browser. We don't save your image, the numbers or the reply on our servers, and we don't look at them.
Anthropic processes the image as our service provider under its commercial terms, which don't allow it to use API inputs to train its models. Anthropic may keep API data for a limited time for safety and abuse monitoring, as described in its own privacy policy. Please don't upload charts you aren't allowed to share with a service provider.
The sample charts on the page were read earlier and are loaded from our site; using them sends nothing anywhere.
Your table and downloads
The data table, your edits, and the PowerPoint, Excel and CSV files are created in your browser. They aren't uploaded. They disappear when you close the page unless you've downloaded them.
Usage limits
Reading charts costs us money for each image, so we limit how many each visitor can read. To do that, our server stores a counter keyed by a one-way hash of your IP address and the date, which can't be turned back into the address and is deleted after two days. For Pro, the counter is keyed by a one-way hash of your license key and kept for about 40 days.
What we store in your browser
If you have Pro, your license key is saved in your browser's local storage so Pro stays unlocked. ChartSnap doesn't use cookies. You can clear this at any time by clearing the site's data in your browser.
Purchases
Payments are handled by Polar Software Inc., our merchant of record. Polar collects your name, email address, billing address and payment details to process the payment, calculate tax and send receipts, under its own privacy policy. Polar shares your email address, order details and license key with us so we can provide Pro and answer support requests. We never receive your card details. When you return from checkout, the page asks our server for your license key using the checkout reference in the address bar, so Pro can unlock right away.
Hosting and logs
ChartSnap is hosted by Cloudflare, which processes your IP address and basic request information to deliver the site and protect it from abuse. We don't use analytics or advertising trackers.
Your rights
You can ask what personal information we hold about you, ask us to correct it, or ask us to delete it, by emailing tinyusefulthings003+chartsnap@gmail.com. Purchase records held by Polar are covered by Polar's privacy policy, and some must be kept for tax reasons.
Changes
If we change this policy, we'll update the date at the top of this page.