Terms of use
Short, and meant to be read. Using this site means accepting what is below.
What is offered
A set of static pages that run in your browser and help you write and check text about a picture: they measure the file, read back what you type, and report what is wrong with it. They do not compose a description on your behalf, and nothing in these terms should be read as promising that they will. It is offered free of charge and as it stands, with no warranty of any kind, express or implied. It may be unavailable, it may change, and it may be withdrawn.
Your pictures and your words
Whatever rights you have in a picture you open here, you keep. Nothing is claimed over it and nothing could be: the file is never transmitted and this site never holds a copy. The same applies to any text you write in a field on this site. It is yours, it stays in your browser, and copying it out is the only way it goes anywhere.
You are responsible for having the right to use the pictures you open, and for what you publish afterwards.
What the grade certifies
Nothing, in a legal or a regulatory sense. The checker reports structural faults in a string and presents a letter that sums them up. A grade of A means that string cleared the checks implemented on this site on the day you ran it. It is not an accessibility audit, it is not a conformance claim against WCAG or GIGW or any other standard, and it cannot be cited as one.
Conformance is a property of a page, assessed against criteria that include whether a description actually serves an equivalent purpose. No automated tool decides that, this one included, and this site states as much wherever the question comes up.
Liability
To the fullest extent the law allows, no liability is accepted for any loss arising from use of this site or from reliance on anything it reports — including a failed audit, a rejected submission, or a description that turned out to be wrong about the picture. The words you publish are your decision.
The written pages
The guides here summarise published standards in plain language and link the reasoning to the criteria they come from. They are an orientation, not legal advice, and where a guideline document and a page on this site disagree, the guideline document is right.