Legal

Terms of Use

Last updated: September 23, 2026

By using this site you agree to these terms. If you do not agree, please do not use the site.

What the tools are

Real Sizer provides free, browser-based measuring instruments. They run on your device using your browser's own capabilities, so what they produce depends on your browser, your operating system, your display and, most of all, on a calibration you perform yourself by visually aligning a clean, smooth-edged ID-1 card just above the display without touching it. Results vary with all of those. Each reading carries the error band printed beside it in the readout. That band bounds two named terms: the reference object's permitted dimensional spread, and an allowance for how accurately a person can line up two edges. It does not bound a bent card, a gap or tilt above the display, a curved panel, or a display swapped for another one that reports the same resolution. The methodology page sets all of this out in detail and is part of understanding what a reading tells you.

What a reading is not for

Real Sizer is a general-purpose utility. It is not a metrology instrument, and it is not built for anything where being wrong carries material consequences. Keep hard, sharp or abrasive objects away from the display; measure physical objects with the printable ruler or another physical ruler instead. Do not rely on an on-screen reading for engineering tolerances, medical or clinical purposes, legal or evidentiary measurement, or any decision about money or safety. Where a dimension matters, a traceable physical instrument is the authority. If a reading here disagrees with a physical ruler, the physical ruler is right.

No account, so nothing to terminate

There is no sign-up, no login and no profile. Using the site means loading a page that computes something, so there is no account for us to suspend or close and nothing for you to cancel.

Nothing is held here, so nothing can be restored

Your calibration lives in your own browser's storage on your own device, as the privacy policy describes. There is no copy on any server of ours, no account it is attached to, and no support route that could produce one for anybody, including you and us. If it is lost, the remedy is to calibrate again, which takes about twenty seconds. The same fact keeps your calibration out of everyone else's reach.

Provided as it is

The site and its tools are provided as they are and as available. To the fullest extent permitted by law, all implied terms and conditions of every kind are excluded, including any implied term as to satisfactory quality, merchantability, accuracy or fitness for a particular purpose, and no assurance is given that the site will be available, that any reading will be correct for your purpose, or that any page will behave identically on every browser or device. What is claimed about accuracy is claimed on the page itself, in the readout, as a band with a stated derivation. Nothing on this site should be read as an assurance beyond that band.

Use it at your own risk

You are responsible for using a clean, flat, undamaged, smooth-edged ID-1 card; holding it just above the display without touching, pressing or sliding it on the glass; looking square-on; choosing the edge you match; and recognizing that any gap or tilt is outside the printed band. Re-calibrate whenever your display changes, whenever you move to another screen, and whenever the page asks. A move to a different monitor of the same resolution is invisible to any browser, so re-calibrate after one even when nothing has asked you to.

Limitation of liability

To the maximum extent permitted by law, the site operator shall not be liable for any indirect, incidental, special or consequential damages arising from use of the site, including anything mis-measured, mis-ordered, mis-cut or mis-fitted as a result of a reading taken here. Some jurisdictions do not allow certain limitations, so parts of this section may not apply to you.

Content, data and sources

The text, data files, code and generated graphics on this site are the operator's own work. The dimensional figures are read out of published standards, which remain the property of their publishers; they are cited by clause and quoted in short extracts for one purpose, which is to show where a number came from and let a reader check it. Anything the tools compute for you is yours to use, for anything you like.

Acceptable use

Do not attempt to disrupt the site, scrape it abusively, present it as your own, or use it in violation of applicable law.

Changes

The tools and these terms may change over time. Continued use after a change means acceptance of the updated terms. The date at the top of this page shows when they last changed.

Contact

Questions: hello@realsizer.com. See also Privacy and About.