Gmail Clipping Checker

How to check your email HTML

1. Paste the HTML or import a UTF-8 .html file.
2. Read exact bytes, decimal kB, binary KiB and the advisory band.
3. Review overlapping diagnostics, compare an edited version, then test the final delivered email.

Features

• Measures email HTML as UTF-8 source bytes
• Shows size contributors and overlapping findings
• Compares a revised version with the original
• Compares size with an advisory Gmail reference
• Lets you copy a concise size report

Use cases

• Check an email before a Gmail send test
• Find large markup in an email template
• Compare the byte size before and after editing
• Share a source-size report during email QA

What the number means

<p>Hello</p> is 12 UTF-8 bytes; &amp; is five source bytes. We count source code, not rendered text.

Remote image files are excluded, but URLs and embedded data URI text count. ESP tracking and personalization may change the received HTML.

A lower source size does not guarantee that Gmail will show the whole message. Preserve layout and required content when revising code.

Local analysis and limits

The tool analyzes locally and never renders or uploads your HTML. Files must be UTF-8 and at most 5 MiB; editor analysis stops above 5,000,000 UTF-16 units.