Are NanoTools completely free to use?

Yes, all basic tools on NanoTools are completely free to use with no registration required. We offer premium features for power users.

Is my data secure when using NanoTools?

Your files are processed securely and are automatically deleted after processing. We do not store your files or data on our servers.

Do I need to install any software to use NanoTools?

No installation required. All tools work directly in your browser on any device - computer, tablet, or smartphone.

What file formats are supported?

We support a wide range of formats including PDF, JPG, PNG, WebP, GIF, JSON, XML, CSV, and many more depending on the tool.

Responsive Grid Tester - Test Responsive Design

Test responsive grids online for free. Preview layouts at different screen sizes. Responsive design tool.

Responsive Grid Tester

Test layout responsiveness with custom breakpoints

Device Breakpoints

Grid Settings

Columns: 12

Gap: 16px

Grid Preview

Mobile: 375px

1

2

3

4

5

6

7

8

9

10

11

12

Column Width: 16.58px

Generated CSS

.grid-container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}

/* Media Query for Mobile */
@media (min-width: 375px) {
  .grid-container {
    max-width: 375px;
  }
}

Common Breakpoints:

Mobile: 375px - 767px
Tablet: 768px - 1023px
Laptop: 1024px - 1439px
Desktop: 1440px+

What This Tool Does

Test grid layouts at multiple breakpoints
Preview mobile, tablet, laptop, desktop sizes
Adjust grid columns and gap spacing
Calculate column widths automatically
Generate responsive CSS media queries

How to Use

1
Select device
Choose breakpoint (mobile, tablet, laptop, desktop)
2
Configure grid
Set number of columns and gap size
3
Preview layout
See how grid looks at selected breakpoint
4
Copy CSS
Get generated grid CSS with media queries

How it works

1

Select device

Choose breakpoint (mobile, tablet, laptop, desktop)

2

Configure grid

Set number of columns and gap size

3

Preview layout

See how grid looks at selected breakpoint

4

Copy CSS

Get generated grid CSS with media queries

Use Cases

Testing responsive grid layouts before coding
Planning breakpoint strategies
Designing mobile-first grid systems
Learning responsive design principles
Prototyping grid-based page layouts

Frequently Asked Questions

What are common breakpoints?

Mobile: 375px, Tablet: 768px, Laptop: 1024px, Desktop: 1440px+

Should I design mobile-first?

Yes, mobile-first approach is recommended for better responsive design.

How many columns should I use?

12 columns is standard for flexibility, but 4-6 columns works for simpler layouts.

What is gap in CSS grid?

Gap sets spacing between grid items without affecting outer margins.