Email Subject Line Pixel Width & Mobile Previewer
Measure exact pixel width and character truncation points of email subject lines and preheader text across iPhone Mail, Gmail Android, and Outlook Desktop. 100% free, instant execution, dark mode supported, and zero registration required on TempoMailUSA.
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Overview & Usage
Email Subject Line Pixel Width & Mobile Previewer is a free online tool designed for email subject line mobile pixel preview. Measure exact pixel width and character truncation points of email subject lines and preheader text across iPhone Mail, Gmail Android, and Outlook Desktop. It runs quickly and privately in your browser with instant copy and export options.
This tool runs with complete privacy in your browser. All inputs, calculations, and DNS verifications follow current web standards.
Technical Specifications
| Tool Name | Email Subject Line Pixel Width & Mobile Previewer |
|---|---|
| Category | Email & SMTP Forensics |
| Processing | Client-Side (Browser) |
| Privacy | Private — No inputs are saved or tracked |
| Output Formats | Clipboard Copy, Text, and JSON |
How to Use Email Subject Line Pixel Width & Mobile Previewer
Enter your domain, IP address, text, or code into the input field above, or click one of the quick sample presets.
The tool processes your input locally in your browser in milliseconds without sending your data to any server.
Inspect the generated code, formatted results, and diagnostic details in the results panel.
Click the Copy button to copy the output directly to your clipboard, or download it to your computer.