Works with Klaviyo

Spam Score Checker for Klaviyo: Free Browser-Based Tool

Q: Is there a free way to spam-trigger analysis for Klaviyo campaigns?

Yes. The MiN8T Spam Score Checker below runs entirely in your browser — no signup, no upload, and the output works with any Klaviyo workflow.

→ Open the free Spam Score Checker

Browser-only, no signup, no upload. Output works with any Klaviyo campaign.

Built by the MiN8T Engineering Team · Updated 28 May 2026

MiN8T Spam Score Checker interface preview

Klaviyo's built-in tools cover the basics, but the spam score checker workflow often benefits from a dedicated, browser-only preprocessor before uploading. Pre-send spam-trigger analysis catches issues before they impact your sender reputation. Free rule-based scoring combined with a Naive Bayes classifier identifies precisely which content triggers fire.

Why pre-process before uploading to Klaviyo

Klaviyo's Email Health Check tab provides aggregate inbox-placement data but no per-campaign pre-send rule scoring.

Step-by-step: spam-trigger analysis for Klaviyo

Paste your campaign HTML into the free spam score checker below
60+ rules evaluate subject patterns, body keywords, header completeness, link density, HTML structure, image-to-text ratio, and authentication signals
A Naive Bayes classifier trained on 50,000+ labeled messages provides a complementary spam-probability score
Review the rule-by-rule breakdown and fix triggers before sending via Klaviyo

Klaviyo-specific deliverability quirks to know

Klaviyo recommends keeping email weight under 100 KB to avoid Gmail clipping. Their built-in image CDN handles transformations but does not minimize source weight.

Frequently asked questions

Does Klaviyo include a built-in spam score checker?

Klaviyo provides basic functionality but lacks granular control. Klaviyo's Email Health Check tab provides aggregate inbox-placement data but no per-campaign pre-send rule scoring.

Is there a free way to spam-trigger analysis for Klaviyo campaigns?

Yes. The free MiN8T Spam Score Checker runs entirely in your browser — no signup, no upload, no rate limits. The output is a standard file you can upload directly to Klaviyo.

What image size limit does Klaviyo enforce?

Klaviyo accepts uploads up to 2000 KB per image and recommends a max width of 600px for email body width. Supported formats: JPG, PNG, GIF, WebP.

Does Klaviyo verify SPF, DKIM, and DMARC automatically?

Klaviyo requires dedicated sending domain with full SPF + DKIM + DMARC alignment for sender-score recovery.

What about subject line analysis for Klaviyo?

Klaviyo offers AI subject line generation but does not score spam triggers, sentiment, or length penalties against benchmark data. Use the free subject line analyzer for length scoring, spam-trigger detection, and sentiment analysis before pasting into Klaviyo.

Related free tools

While preparing your Klaviyo campaign, you may also want:

Image Compressor — also free, browser-based, optimized for email marketers
GIF Compressor — also free, browser-based, optimized for email marketers
CSS Inliner — also free, browser-based, optimized for email marketers
Inbox Preview — also free, browser-based, optimized for email marketers