What is Gmail clipping?

When an email HTML exceeds ~102KB, Gmail clips it and shows a 'View entire message' link. This hurts engagement: tracking pixels below the fold may not fire, CTAs can be missed.

What's the maximum safe email size?

Keep HTML under 100KB to be safe on Gmail. Under 80KB is ideal. Total rendered size (HTML + inlined CSS) is what matters, not the source file.

Why are inline data-URI images bad?

They bloat file size dramatically and many email clients (including Gmail and Outlook) strip them. Always host images on a CDN and reference them by URL.

Does every image need alt text?

Yes. Alt text is critical for accessibility (screen readers) and for users with images disabled. Decorative images should use alt="" to be skipped by screen readers.

Do comments affect email size?

Yes. Build-tool comments, MSO conditionals, and documentation comments can add 10–20KB. Strip non-essential comments before sending.

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Email Size Checker

Name: Orbit
Availability: InStock
Author: Justin Williames

Check your email HTML file size, Gmail clipping risk, and common issues.

This tool is part of Orbit. A free Claude Desktop extension with 50+ lifecycle marketing skills. Pay what you think it's worth once it saves you a day.

Get Orbit Pay what it's worth

Paste your HTML

Paste HTML to see results

About the Email Size Checker

Free email HTML size checker that flags the most common production issues: Gmail clipping risk (102KB limit), inline data-URI images, bloated CSS, missing alt text, and excessive HTML comments. Paste your HTML, get a report in seconds.

How to use

Paste your full email HTML into the input.
The tool reports total size, compressed size, and the 102KB Gmail clipping threshold.
It flags data-URI images (they bloat file size), missing alt attributes, CSS weight, and HTML comment weight.
Fix the flagged issues and re-check.

Common use cases

Pre-flight check before publishing a Braze template
Auditing a third-party email template for deliverability risks
Debugging why a Gmail render is cut off
Catching accessibility issues (missing alt text) before send

Who it's for

Email developers, lifecycle marketers, CRM managers, and QA teams shipping production email.

Frequently asked questions

What is Gmail clipping?: When an email HTML exceeds ~102KB, Gmail clips it and shows a 'View entire message' link. This hurts engagement: tracking pixels below the fold may not fire, CTAs can be missed.
What's the maximum safe email size?: Keep HTML under 100KB to be safe on Gmail. Under 80KB is ideal. Total rendered size (HTML + inlined CSS) is what matters, not the source file.
Why are inline data-URI images bad?: They bloat file size dramatically and many email clients (including Gmail and Outlook) strip them. Always host images on a CDN and reference them by URL.
Does every image need alt text?: Yes. Alt text is critical for accessibility (screen readers) and for users with images disabled. Decorative images should use alt="" to be skipped by screen readers.
Do comments affect email size?: Yes. Build-tool comments, MSO conditionals, and documentation comments can add 10–20KB. Strip non-essential comments before sending.

Related Orbit tools

Built into Orbit for Claude

Orbit prevents Gmail clipping before you hit send.

Inside Orbit for Claude, every email Claude produces is size-checked, alt-tagged, and CSS-optimised automatically. The Email Production skill keeps templates under the Gmail 102KB limit, strips bloat, and flags accessibility issues, all before the template ever reaches Braze.

Get Orbit Pay what it's worth