HTML · INPUT TYPE

HTML input type number: min, max, step and when not to use it

Last reviewed November 3, 2026

An <input type="number"> is for real amounts and counts, like a quantity or a price. The browser blocks text that isn't a number and checks min, max and step before the form submits. Don't use it for phone numbers, ZIP codes or card numbers: those are digits, not numbers you do math with. Always check the value again on the server.

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Attributes & common mistakes

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Fill in the form above and press its button. The demo stops the request and lists every name=value pair the browser would send, plus the controls it leaves out.

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Example HTML (changes re-run the live demo)

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Minimal snippet

number-input-example.html

<label for="quantity">Quantity</label>
<input type="number" id="quantity" name="quantity" min="1" max="10" step="1">

Copy-paste code

HTML Input Type Number code you can paste today.

Replace YOUR_ACCESS_KEY with a key from your free splitforms dashboard. The form posts to one endpoint — submissions land in your inbox and dashboard with spam filtering built in.

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input-type-number.html

<form action="https://splitforms.com/api/submit" method="POST">
  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">

  <label for="name">Name</label>
  <input type="text" id="name" name="name" autocomplete="name" required>

  <label for="quantity">Quantity</label>
  <input type="number" id="quantity" name="quantity"
         min="1" max="10" step="1" required>

  <!-- step="0.01" allows cents; inputmode shows a decimal keypad -->
  <label for="budget">Budget (USD)</label>
  <input type="number" id="budget" name="budget"
         min="0" step="0.01" inputmode="decimal" placeholder="250.00">

  <!-- Honeypot: hidden from people, bots fill it in -->
  <input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">

  <button type="submit">Send</button>
</form>

Key facts

How does a number input behave?

A number input only accepts a valid number, checks it against min, max and step, and sends it as a string. The default step is 1, so decimals fail unless you change it.

How does a number input behave?
Fact	Detail
Mobile keyboard	A numeric keyboard. Add `inputmode="decimal"` to make sure a decimal point key shows.
Built-in validation	`badInput` when the text isn't a number, `rangeUnderflow` below `min`, `rangeOverflow` above `max`, and `stepMismatch` when the value doesn't fit `step`.
Submitted value	A number string such as `2.5`. It is empty when the field is left blank.
Default `step`	The default step is 1, so `2.5` fails. Use `step="0.01"` for money or `step="any"` for any decimal.
Scroll wheel and arrow keys	The up and down arrow keys, the spinner and, in some browsers, the scroll wheel change the value by one step.
`maxlength`	Ignored on number inputs. Use `max` to limit the value.

Sources: WHATWG HTML Standard: Number state (type=number) · MDN: <input type="number">

Attributes · <input type="number">

Which HTML Input Type Number attributes matter?

These attributes decide how the <input type="number"> behaves and what actually gets emailed to your inbox when someone submits.

HTML Input Type Number attributes and what each one does
Attribute	What it does	Docs
`name`	The key the value is sent under, such as `quantity`. Without a `name`, the field is never sent.
`min`	The lowest value allowed. Lower values fail with `rangeUnderflow`.	MDN
`max`	The highest value allowed. Higher values fail with `rangeOverflow`.	MDN
`step`	The size of each step. The default is 1. Use `0.01` for cents or `any` for any decimal.	MDN
`required`	Blocks submit while the field is empty.	MDN
`inputmode`	`inputmode="decimal"` asks phones for a keypad with a decimal point; `numeric` asks for digits only.
`placeholder`	An example value, like `250.00`. It disappears on typing, so it is not a label.

Common mistakes

HTML Input Type Number not working? Here's why.

Most broken forms come down to a few small mistakes with the <input type="number">. Check these before you ship, then forward every submission to Slack or a webhook.

Decimals fail with the default step
The default step is 1, so a value like 2.5 fails with stepMismatch. Add step="0.01" for money or step="any" for any decimal.
Don't use it for phone numbers, ZIP codes or card numbers
A number input drops leading zeros, shows spinner arrows and may change the value when you scroll. Use [input type=tel](/html/input-type-tel) for phone numbers, and type="text" with inputmode="numeric" for ZIP codes, postal codes and card numbers.
maxlength does nothing
Browsers ignore maxlength on a number input. Use max to set the highest value allowed.
The value is still a string on the server
The form sends text like "2.5", and anyone can send any value without your form. Parse it as a number on the server and check min, max and step again.

Sources: WHATWG HTML Standard: <input type="number"> · MDN: <input type="number">

Copy-paste ready

The HTML Input Type Number example below is a complete, working form — paste it into any HTML page and it submits, no edits to the markup required.

No backend to build

Your html input type number form posts to one endpoint. No server, PHP, or API route — accepted submissions are saved to your dashboard before owner notification email is attempted; delivery time and inbox placement depend on provider and recipient settings.

A form that really submits

Unlike a static reference snippet, this <input type="number"> form actually sends data to a free splitforms backend, with spam filtering built in.

How it works

How to add HTML Input Type Number to any page.

Copy the html input type number example, drop in your free access key, and paste it into any page — submissions start landing in your dashboard.

Copy the code

Copy the HTML Input Type Number example below.

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Questions

HTML Input Type Number questions, answered.

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How do I allow decimals in a number input?

Set the step attribute. The default step is 1, so only whole numbers pass. Use step="0.01" for money with cents, or step="any" to allow any decimal.

How do I set a min and max on a number input?

Add min and max attributes, for example min="1" max="10". The browser blocks submit when the value is below min or above max, and the spinner stays inside that range.

Why doesn't maxlength work on a number input?

The maxlength attribute only applies to text-like inputs, so browsers ignore it on type=number. Use max to limit the value instead, for example max="999" for up to three digits.

How do I hide the number input spinner arrows?

Use CSS. In Chrome, Edge and Safari, set -webkit-appearance: none and margin: 0 on the ::-webkit-inner-spin-button and ::-webkit-outer-spin-button pseudo-elements. In Firefox, set appearance: textfield on the input.

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