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Design · Local utility

CSS Checkbox Generator

Style a custom checkbox with size, border, and state colors, and copy CSS that keeps a real, keyboard-accessible input underneath.

Task path / input to outcome

Set the control size

Runs locally · Nothing is uploaded

How CSS Checkbox Generator works, privacy, and related tools

Task path / input to outcome

How to design a custom CSS checkbox

  1. 01

    Set the control size

    The mark scales from the space inside the border, rather than the outer size. Preview and export use the same CSS border shape. Click the preview or focus it and press Space to switch its native checked state.

  2. 02

    Shape the frame

    Use an 18–64 px control and a 1–8 px border. At least 8 px must remain inside the border for the mark. Invalid combinations clear the preview and disable export.

  3. 03

    Pick the state colors

    Choose Border color for the resting outline and Checked color for the filled state. Keep the Checked color dark enough to contrast with the white mark it sits behind, because the mark itself is always white.

  4. 04

    Preview both states

    Flip Show checked state to compare the resting and filled sides in the live preview. The mark transitions in over 160 ms with a small scale-up — exactly the motion the exported CSS reproduces between states.

  5. 05

    Copy or download the CSS

    Press Copy CSS or Download .css to save toolars-checkbox.css. The ruleset keeps a real input underneath — appearance: none only repaints it — and :focus-visible plus :disabled states come included in the export.

  6. 06

    Keep the markup native

    Apply the .checkbox class directly to a real input element and pair it with a label as you would for any checkbox. Keyboard focus, click behavior, and assistive-technology announcements keep working because nothing semantic is replaced. The resting white background is part of the rule, so the empty state stays readable on tinted surfaces.

Tool facts

Processing
In your browser
Input leaves this device
Never
Retention
Nothing is stored
Price
Free

Your input stays in the browser.

CSS Checkbox Generator uses its verified local execution path and does not create a hidden input or output history.

Local execution

Runs inside the current browser tab.

No hidden processing

Active tool data never becomes a Toolars document record.

No account required

Use the core workflow without creating a profile. Favorites sync to your account after you sign in.

Immediate reset

Clear the tab and the active working data is gone.

What CSS Checkbox Generator actually does

A settings page full of default checkboxes looks unfinished, and a design system needs the same control in every form without pulling in a JavaScript dependency. Because the exported CSS keeps a genuine input element, keyboard focus and screen-reader announcements keep working — while the brand colors being auditioned never leave the browser tab. A quick flip of the preview toggle confirms both sides of the interaction before any code is copied. The same rule serves a single form or an entire component library.

Common questions

Is the checkbox still accessible?
Yes. The markup stays a real input element; appearance: none only replaces its painting. The export includes a 3 px :focus-visible outline in your accent color and a dimmed :disabled state, and the checked state remains the native one assistive technology announces.
Why was my border rejected?
Use an 18–64 px control and a 1–8 px border. At least 8 px must remain inside the border for the mark. Invalid combinations clear the preview and disable export.
How is the check mark sized?
The mark scales from the space inside the border, rather than the outer size. Preview and export use the same CSS border shape. Click the preview or focus it and press Space to switch its native checked state.
What happens when the checkbox changes state?
The mark scales from zero to full size over a 160 ms transform transition while the background fills with your Checked color. Under prefers-reduced-motion the transition is removed and the state simply snaps, so nothing animates for motion-sensitive users.
What is fixed in the export and what can I change?
The resting background and the mark are always white, so choose a Checked color with enough contrast against white. The 3 px focus outline, its offset, and the half-opacity :disabled state are fixed values you can edit freely after pasting the rule.
Does anything get uploaded?
No. Everything renders locally in the current tab, no account is required, and no value enters storage, logs, or the network. Press Reset to return to the defaults.

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