Email Width & Dimension Checker scans your HTML email and extracts every dimensional value — table widths, image sizes, container dimensions, padding, margins, font sizes, and more. It maps your email structure, flags elements wider than 600px, and shows a visual width breakdown so you can spot layout issues instantly.
Email Width & Dimension Checker
Analyze your HTML email dimensions: content width, table widths, image sizes, padding, font sizes, and element structure. Detect oversized elements that break mobile layouts.
HTML Email 0
Paste HTML and click Analyze
About Email Width & Dimension Checker
Features
- Full dimension scan: Extracts widths, heights, padding, margins, fonts from all elements
- Width violation detection: Flags any element exceeding the 600px email standard
- Image analysis: Lists all images with their width/height attributes
- Table structure map: Shows nested table hierarchy with widths at each level
- Visual width bar: Color-coded bars showing each element's width relative to 600px
- Summary stats: Max width found, total images, tables, font range
How to Use
- Paste your HTML email code
- Click Analyze to scan all dimensions
- Review the visual width breakdown and issue flags
Benefits
- Catch oversized elements before they break layouts
- Verify image dimensions match retina best practices
- Understand your email structure at a glance
- Free, private, runs in your browser
Frequently Asked Questions
What does this tool check?
It parses your HTML and extracts all dimensional values: table widths, image dimensions, container max-widths, padding and margin values, font sizes, and line heights. It flags anything over 600px (the standard email max width) and elements that could cause overflow.
Why is 600px the standard email width?
Most email clients have a reading pane between 500-700px wide. Using 600px as the max content width ensures your email fits in virtually all clients without horizontal scrolling, including Outlook, Gmail, and webmail views.
What image sizes should I use?
Hero images should be 600px wide (1200px for retina). Column images should match their column width. All images need explicit width and height attributes, plus max-width: 100% for responsive scaling.
Does it check file sizes?
No. This tool analyzes HTML dimensions only (width/height attributes and CSS values). It does not download or measure actual image file sizes.
Is my HTML stored anywhere?
No. All analysis runs in your browser. Nothing is transmitted.