is there a max size to the length of a hidden input in html?

It depends on the method you send the form with.

With GET, there is a commonly agreed on limit of about 1-2 kilobytes, depending on browser and server limitations.

With POST, there is no technical limit in the browser, but usually one on the server side – see e.g. Apache’s LimitRequestBody, PHP’s post_max_size and so on.

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