---
title: "Free tools for social images and brand colours"
url: "https://www.onmark.com.au/tools"
description: "Free tools for business owners, marketers and designers: check social image crops and brand colour contrast. No sign-up, and nothing is uploaded."
site: "Onmark"
---

# Tools that make it clear.

Free tools for business owners, marketers and other designers. We built them for our own work and share them because they’re useful. There’s no sign-up, and nothing is uploaded.

Social · imagesUpdated Sep 2026

## Social image check

Drop in an image to see exactly how it crops on LinkedIn, Instagram, Google and in email. Then measure any area and check any text on it can be read.

- Crop previews and safe zones for 9 formats, with fits, crops and too-small flags
- Drag a rectangle to see its size and ratio live, or snap to any standard ratio
- Contrast check on text in the image (WCAG 2.2 and APCA), plus colour-blindness previews

[Check an image](https://www.onmark.com.au/tools/social-image-check) For marketers, business owners and social teams

Brand · accessibilityUpdated Sep 2026

## Brand colour check

Enter your brand colours to see which combinations can carry text, which ones confuse people with colour-blindness, and the smallest change that fixes each failing pair.

- Scores every text and background pair against WCAG 2.2, with APCA (the WCAG 3 draft) as an option
- Colour-blindness simulation that flags colours that look alike
- One-click fixes, a share link, and export to CSS or Tailwind v4

[Check your colours](https://www.onmark.com.au/tools/brand-colour-check) For brand owners, designers and developers

What should we build next? Email [info@onmark.com.au](mailto:info@onmark.com.au). We often build from the questions we get asked.

## How our tools work

### Private by design

Everything runs in your browser. Your images and colours are never uploaded, stored or tracked.

### Kept current

We review platform sizes every quarter, when we update our own templates.

### Built to the standard

WCAG 2.2 today, with APCA ready for WCAG 3. The tools themselves work with a keyboard and a screen reader.

## Good to know.

### Are the tools really free?

Yes. There’s no sign-up, no trial and no limit. Use them for your own work or for clients.

### Do you upload or store my images or colours?

No. Everything runs in your browser. Images are read on your device and never sent anywhere, and nothing is tracked.

### Which platforms and standards do they cover?

LinkedIn, Instagram, Google Business Profile and email for images. For colour and text contrast, WCAG 2.2, the current standard, and APCA, the draft method for WCAG 3.

### How often are the platform sizes updated?

Every quarter, when we update our own templates. They were last checked in September 2026.

## Rather have it done properly?

We build brand systems, websites and social templates that pass these checks from the start.

[Start a project](https://www.onmark.com.au/contact)