Privacy policy

Last updated: 8 November 2026 (OnSketch Pro payments added)

OnSketch (onsketch.io) is a free sketching app that runs in your browser. This page explains what it stores about you, why, and where. In short: you can use OnSketch without an account, nothing is sold, and there is no advertising.

Without an account

Your drawing, your window layout and your preferences (theme, toggles) are kept in your own browser's storage. They never leave your device unless you choose to export them or send a problem report.

With an account

Signing in is optional. It lets you keep your projects online and open them on other devices. When you sign in we store:

• Your email address, used to identify your account and send you sign-in links or codes.
• If you sign in with Google: your name, email address and profile picture, as shared by Google. We only use them to show who is signed in. We do not get access to your Google account, contacts or files.
• Your public username, which you choose yourself and can change at any time. It is shown next to your public sketches in the library. Your account picture is shown with it only if you tick "Show my account picture". Your email address and the name on your Google account are never shown.
• Optional profile details you choose to add: a short description, your country and a website. They are public, on your profile page (onsketch.io/library/?u=yourname) and next to your sketches, and you can remove them at any time.
• Thumbs-up you give to public sketches. Only the total per sketch is shown; nobody else can see which sketches you liked.
• The projects you save to your account: the drawing, its name, and when it was created and changed. On the free plan, sketches are public: once saved with a title and a description, they appear in the library, where anyone can view them and open a copy. Premium sketches can be private.

Accounts and projects are stored by Supabase, the database and sign-in service OnSketch uses. Your browser also keeps a sign-in token so you stay signed in.

OnSketch Pro payments

If you subscribe to OnSketch Pro, the payment is handled by Lemon Squeezy, our reseller (merchant of record): it collects your payment details, billing address and tax information, and sends the invoices. OnSketch never receives your card details. We receive and keep what is needed to run your subscription: its status, plan (monthly or yearly), renewal or end date, and Lemon Squeezy's subscription and customer numbers, linked to your account.

Visit statistics

We count visits with Umami, which does not use cookies and does not track you across sites. It records pages viewed, the referring site, browser, device type and country, without identifying you. It also counts which features are used (for example: a sketch saved, a tool picked, a library sketch opened, an error in the editor), with short labels such as the tool's name. It never receives your drawings, what you type, or your email address.

Problem reports

If you use "Report a problem", we receive your message, the email address you enter (optional), your browser, screen size, app version and recent errors, and the current drawing if you tick the box. Reports are delivered by Formspree and used only to fix the problem.

Hosting

The site is hosted on GitHub Pages, which may log technical data such as IP addresses for security. The editor loads the Supabase sign-in library from the jsDelivr CDN when you sign in.

What we don't do

• No advertising, no selling or renting of your data.
• No use of your drawings for anything other than storing and showing them to you (and to others, if you make a project public).
• Data from Google sign-in is used only as described above, in line with the Google API Services User Data Policy.

Keeping and deleting your data

Your projects stay in your account until you delete them. You can delete any project from My projects in the editor. To delete your whole account, or to get a copy of your data, send a request through "Report a problem" in the editor (with your account email). We delete the account and all its projects. Data in your browser can be cleared by clearing the site's data.

Your rights

Depending on where you live (for example under the GDPR in the European Union), you can ask to access, correct, export or delete your personal data, and object to how it is used. Contact us as described above. You can also complain to your data protection authority.

Changes

If this policy changes, the new version will be posted on this page with a new date.