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OTP Input

An intuitive 6-digit OTP input component that autofocuses when you enter a single character and returns to the previous box with backspace. Also supports paste.

HTMLCSSJavaScript

Preview

6-digit OTP input box. Entering a number automatically moves to the next box.

Enter verification code
When you enter a number, it will automatically move to the next box.

Use cases and features

  • Authentication flow: Ideal for SMS/email authentication code input, two-factor authentication (2FA) screens.

  • Paste support: Pasting numbers from the clipboard will automatically distribute them to each box.

  • Mobile optimization: inputmode="numeric" automatically displays the numeric keyboard on smartphones.

  • Validation: Exclude non-numeric inputs with replace(/[^0-9]/g, '').

Points of design and UX

  1. 52x60px box size: Optimal size for high visibility and easy touch operation.

  2. transform: scale(1.05) on focus: You can clearly see which box is currently being entered.

  3. .filled class: Visualize progress by changing the border color of the filled box.

How to customize

Changed to 4 digit OTP


{/* Reduce input elements to 4 */}

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

Change box size


.otp-box { width: 44px; height: 52px; font-size: 1.25rem; }

Implementation code

<div class="otp-inputs" id="otp-inputs">

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

<input class="otp-box" type="text" inputmode="numeric" maxlength="1" />

</div>



<style>
.otp-inputs { display: flex; gap: 0.75rem; }

.otp-box {

width: 52px; height: 60px;

background: rgba(255,255,255,0.06);

border: 2px solid rgba(255,255,255,0.12);

border-radius: 12px;

color: white;

font-size: 1.5rem;

font-weight: 700;

text-align: center;

outline: none;

transition: border-color 0.2s, background 0.2s, transform 0.1s;

}

.otp-box:focus { border-color: #6366f1; background: rgba(99,102,241,0.1); transform: scale(1.05); }

.otp-box.filled { border-color: rgba(99,102,241,0.5); }
</style>



<script>

(function() {

var inputs = Array.from(document.querySelectorAll('#otp-inputs .otp-box'));

inputs.forEach(function(input, i) {

  input.addEventListener('input', function(e) {

    var val = e.target.value.replace(/[^0-9]/g, '');

    e.target.value = val.slice(-1);

    if (val && i < inputs.length-1) inputs[i+1].focus();

    e.target.classList.toggle('filled', !!e.target.value);

  });

  input.addEventListener('keydown', function(e) {

    if (e.key==='Backspace' && !e.target.value && i>0) {

      inputs[i-1].focus(); inputs[i-1].value=''; inputs[i-1].classList.remove('filled');

    }

  });

  input.addEventListener('paste', function(e) {

    e.preventDefault();

    var text = (e.clipboardData || window.clipboardData).getData('text').replace(/[^0-9]/g, '');

    text.split('').forEach(function(ch, j) {

      if (inputs[i+j]) { inputs[i+j].value = ch; inputs[i+j].classList.add('filled'); }

    });

    var nextEmpty = inputs.findIndex(function(inp, j) { return j >= i && !inp.value; });

    if (nextEmpty !== -1) inputs[nextEmpty].focus();

  });

});

})();

</script>

Browser compatibility status

| Browser | Compatibility status |

|--------|-------|

| Chrome 66+ | ✅ Fully compatible |

| Firefox 63+ | ✅ Fully compatible |

| Safari 12+ | ✅ Fully compatible |

| Edge 79+ | ✅ Fully compatible |

On mobile, inputmode="numeric" automatically displays the numeric keyboard, greatly improving usability.