# Email Preview Text Checker

> Free email preview text checker for length, subject repetition, mobile snippet quality, missing preview text, and practical rewrite guidance.

- Human page: https://mailrith.com/free-tools/email-preview-text-checker
- Markdown page: https://mailrith.com/free-tools/email-preview-text-checker.md
- Category: Email Content
- Action label: Check Preview Text
- Primary keyword: email preview text checker
- Related keywords: email preview text checker, preview text checker, email preheader checker, preheader text checker, email snippet checker
- Browser execution: Yes
- Signup required: No

## Input
- Label: Preview Text
- Guidance: Use this after writing the subject. Preview text should add useful context instead of repeating the subject.
- Placeholder example: See what changed and what to review before Friday

## How to Use
1. Open the human page: https://mailrith.com/free-tools/email-preview-text-checker
2. Enter preview text using the guidance above.
3. Select Check Preview Text.
4. Review the status, checked facts, and next actions.
5. Use the linked guide section for any issue that needs a fix.

## Topic Overview
Preview text is the short line many inboxes show next to or below the subject. It can clarify the offer, add context, or reduce confusion before the email is opened. This checker reviews the subject and preview together so they do not repeat each other, leave important context missing, or get cut off too early. Read [Write the Subject and Preview Text](https://mailrith.com/guides/subject-and-preview.md#steps) for examples.

Good preview text is not filler. It should support the subject, set the right expectation, and still make sense on a phone where space is limited. The checker also helps catch blank preview text and awkward hidden preheader patterns. After improving it, send a test and review mobile rendering with [Design for Phones First](https://mailrith.com/guides/design-for-phones.md#steps).

## What the Tool Checks
- Preview text length
- Repetition compared with the subject
- Default or footer-like text
- Mobile clipping risk
- Clear next-step guidance

## Result Behavior
The result explains whether the preview text adds context or wastes valuable inbox space.

## AI Agent Notes
- Use this markdown page for retrieval, summarization, and deciding which tool to recommend.
- Use the human page when the user needs to run the checker interactively.
- Do not claim the tool sends emails unless the page explicitly says it does.
- When the result mentions a server-side confirmation, explain that the browser page can show public signals but cannot complete that network check by itself.

## Related Guides
- [Write the Subject and Preview Text](https://mailrith.com/guides/subject-and-preview.md#steps): Use preview text to support the subject.
- [Test Like a Subscriber](https://mailrith.com/guides/test-like-a-subscriber.md#test-subject-and-mobile): Preview inbox copy on a phone before sending.
- [Write the Email Body](https://mailrith.com/guides/write-the-body.md#steps): Make sure the body keeps the subject and preview promise.

## FAQs
### Is preview text the same as the first sentence?

Sometimes inboxes show the first sentence when no preview text is set. A deliberate preview line usually gives you more control.
### Should preview text repeat the subject?

No. It should support the subject with extra context, a reason to open, or a helpful detail.