Icons on input field
Input field without icons
Do icons really matter on an input field? Do they encourage users signing up?
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When the icons exactly (or as near possible) confer the ideas and concepts of a form's box, they are greatly beneficial to rapidity of viewer comprehension.
Good/Great icons provide another more subjective quality, that of endearment and apparent consideration (demonstrated empathy) of and to the time/rate of the user's digestion and ease of familiarity with the functions and purposes of elements/forms etc.
Unfortunately there's no objective way to absolutely say that an icon is absolutely the best and most effective of its type and for its purpose. Although I think it can be safely and assuredly said that the example you show works quite well.
If this is your situation, I suggest you use these types of icons with stylistic considerations appropriate to your site/environment.
The best answer would be 'Ask Yourself'.
When you drive car, Do you want to read Road Signals in written text?
Probably Not. Because it will take time and you should be focused on the road.
So, Red, Yellow and Green colors are simple enough to convey the meaning of signals.
Arrow signs are quite simple than 'TURN RIGHT' or 'DO NOT TRY TO OVERTAKE' (by the time you read, you .. you know)
Likewise, People are tired of reading the same sentences all over the Internet. 'Enter your name', 'email address' etc..
But, when you see a Kid's head, You get the idea that this field is asking for nickname and a Locker image is nothing but the Password field.
And most importantly. Pictures attract more than text. ( for example, 'Like' text or 'Heart' icon. Which one will you prefer for your Instagram pics? ) I like <3<3<3