Privacy Policy

Last updated 2026-10-09.

Data this site collects

SizeDecoder is a static site. It does not require an account, and none of the size or measurement tools ask you to create one. Where a tool (such as My Size Card) lets you save your own measurements, that data is stored only in your browser's local storage on your own device — it is never transmitted to us or to any third party, and we have no way to see it. Clearing your browser data removes it.

Analytics

This site uses Google Analytics 4, run by Google, to understand which pages are useful and which aren't — page views, referring pages, approximate location at the country or city level, and general device and browser type. We read that information as aggregate reports; we never look up an individual visitor, and we have no mechanism here for attaching a name, email address, or account to any of it. Google Analytics does, however, assign your browser a randomly generated client identifier so it can tell a repeat visit apart from a new one, and that identifier persists between visits. We also use Vercel's own aggregate page-view analytics alongside it.

Cookies

Google Analytics sets cookies on your device — principally _ga and a per-property _ga_<id> — which store the randomly generated client identifier described above and how long your visit lasted. Google's advertising service, AdSense, sets cookies of its own, which are covered in the next section. We do not sell data to advertisers or data brokers. A payment processor may set its own cookies during an actual purchase, as described under Third-party services below. If you would rather not be counted at all, most browsers can block these cookies or block the Google Analytics script outright, and every conversion table, chart, and tool on this site works exactly the same either way.

Advertising

SizeDecoder shows display ads through Google AdSense, which helps keep the size charts and converters free. Google and its advertising partners use cookies to serve and measure those ads, and depending on your ad settings the ads may be personalised — including remarketing — based on your visits to this site and to other websites. If you are in the EEA or the UK, Google asks for your consent before setting personalised-advertising cookies, and you can change that choice at any time.

No size chart, conversion or fit recommendation is shaped by an advertiser, and advertisers never see a page before it is published. A few measuring guides also link to a tape measure, ring sizer or foot-measuring device on Amazon as an affiliate, as the affiliate disclosure explains.

To see why an ad appeared or to turn off ad personalisation, visit Google My Ad Center; to opt out of interest-based ads from many companies at once, use aboutads.info. Google explains its advertising cookies in its advertising policy.

Payments

If you purchase a paid product or make a donation on this site, payment is processed by Stripe. We do not store your card details ourselves — Stripe handles that in accordance with its own privacy policy and PCI compliance obligations.

What we don't collect

We don't ask for your name, email address, or any account credentials to use any conversion table, chart, or tool on this site. An email address enters the picture only if you choose to give us one: through the contact form, which is delivered to our inbox by Brevo and kept only as long as needed to answer you, or by subscribing to the newsletter, which stores your address with Brevo until you unsubscribe. A contact message is never added to the newsletter list without separate, explicit consent.

Local storage versus cookies

The My Size Card tool specifically uses your browser's local storage, a different mechanism from a cookie — local storage isn't sent to any server on each page request the way a cookie is, and it's readable only by pages on this site running in your own browser. Nothing about your saved measurements is visible to us, to analytics, or to any third party, since the data never leaves your device in the first place.

Children's privacy

This site isn't directed at children, and we don't knowingly collect personal information from anyone we know to be under 13. A parent measuring a child's shoe or clothing size using this site's charts and tools isn't submitting the child's personal information anywhere — as above, any measurement entered into a tool stays in the browser's local storage and is never transmitted.

Your choices

You can clear your browser's local storage at any time to remove anything saved by My Size Card, and most browsers let you block or limit analytics and third-party scripts through their own privacy settings without needing to contact us first. If you'd like confirmation of what limited data we might hold about a message you sent us, or want it deleted, contact us using the details below.

Third-party services

Google receives data through the Google Analytics and AdSense scripts described above, which load on every page and operate under Google's own privacy policy. Stripe's payment scripts load only at the point of an actual purchase and operate under Stripe's own privacy practices during that transaction only — they aren't present on ordinary conversion, chart, or measuring-guide pages where no purchase is happening. Vercel hosts the site and counts page views without cookies, and Brevo holds newsletter subscriptions and delivers contact messages. Nothing you type into any measuring tool on this site is sent to any of them.

International visitors

This site is used by visitors in many countries, and the data-handling approach above — minimal collection, no accounts, local-only storage for saved measurements — is the same regardless of where you're visiting from. The one difference is advertising: in the EEA and the UK, Google asks for your consent before personalised-advertising cookies are set.

Changes to this policy

If this policy changes in a way that affects what data is collected or how it's used, we'll update the date at the top of this page. Continuing to use the site after a change means you've seen the updated version.

Contact

Questions about this policy can be sent to contact@sizedecoder.com.