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InputMask is the input with a mask. Mask gives user the cue about the number and format of the data that needs to be entered.

Note, that InputMask should not be used as an input placeholder.

The mask helps user to avoid mistakes when entering the required number of characters and automatically formats the entered value.

Use InputMask when:

  • the format for the data is known;
  • user needs to enter a certain (usually large) number of characters.

Do not use InputMask if you don't know the exact format for the data.


The symbol that reserves space for character, – _.

The mask has the color of the text, so it is important to add a placeholder to the input. It can reduplicate the mask. Placeholders help the user navigate the form and see which inputs are already filled in.

Example of using a mask in the input field to enter a phone number.

Appearance examples Tokens
Placeholder Placeholder use --text-placeholder as color.
Mask Mask use --text-primary as color.

Help instructions

We recommend you to provide visible text instructions for inputs with constraints, such as a specific format for data.

Size (height in px) Text size for the hint Appearance example Margins
M (28px) 12px (use --fs-100, --lh-100 tokens)
L (40px) 14px (use --fs-200, --lh-200 tokens)


You can validate the characters user enters. If the user enters an invalid character (for example, /), the InputMask will cut it.

Example of the mask behavior in the input field for entering a phone number.

Placeholder Focus with mask Filled