For most WordPress sites, Really Simple SSL is the best first fix, SSL Insecure Content Fixer is the best lightweight backup, and Cloudflare is best as a network-level helper rather than the only repair. Mixed content happens when an HTTPS page still loads images, scripts, fonts, CSS, or embeds through HTTP, which browsers treat as unsafe; Google Chrome has blocked or upgraded many mixed content requests over time [source: Google Chrome]. The fastest path is usually: fix WordPress URLs first, then use Cloudflare to catch what remains.

TLDR: Really Simple SSL suits site owners who want a broad WordPress SSL setup with redirects, detection, and mixed content fixes in one place. SSL Insecure Content Fixer is better when the only job is replacing insecure front-end asset URLs without extra security features. Cloudflare helps at the edge with tools such as Automatic HTTPS Rewrites, but it may not repair hardcoded database links or plugin output. For example, a small WooCommerce site with 120 product images might clear 95% of mixed content after a database URL cleanup, while Cloudflare catches the last few external image calls that still load over HTTP.

What Mixed Content Really Means

Mixed content is not just a warning badge in the browser. It can break layouts, stop checkout scripts, block tracking pixels, or make visitors think a site is unsafe. That tiny lock icon matters more than many teams admit.

There are two common types:

• Passive mixed content: Images, video, or audio loaded through HTTP. Browsers may auto-upgrade some of it.
• Active mixed content: Scripts, stylesheets, iframes, and fonts loaded through HTTP. Browsers often block this because it can change page behavior.

Honestly, it feels like mixed content should be gone by now. Yet it still appears after migrations, theme changes, CDN setup, old page builder blocks, and imported demo content. One hardcoded logo URL can ruin an otherwise clean HTTPS setup.

SSL Insecure Content Fixer: Best for a Focused Repair

SSL Insecure Content Fixer is a WordPress plugin built for one main job: finding insecure HTTP asset URLs in page output and converting them to HTTPS where possible. It is not trying to be a full SSL management suite. That is both its strength and its weakness.

The plugin offers several fixing levels, often ranging from basic content fixes to broader output capture. A simple mode may fix images and links in post content. A more aggressive mode can scan larger chunks of page output before it reaches the browser.

Best use cases:

• Sites that already have a valid SSL certificate.
• WordPress installs where only a few front-end URLs still use HTTP.
• Developers who want a small fix without many extra settings.
• Older themes that print image or script URLs incorrectly.

Weak spots: aggressive fixing can add overhead, and it may hide the real source of the problem. If a plugin stores HTTP URLs in the database, a runtime replacement only masks it. The issue can return when caching changes or a new template loads.

Really Simple SSL: Best All-Round WordPress Option

Really Simple SSL is usually the easiest choice for non-technical WordPress users. It checks SSL status, adjusts WordPress settings, can enable redirects, and includes mixed content fixing. It is popular because it turns a messy SSL migration into a guided checklist.

This makes it a strong option after moving from HTTP to HTTPS. It can help update site URLs, handle common redirect rules, and reduce browser warnings without needing to edit server files by hand.

Best use cases:

• New HTTPS migrations.
• Small business sites without a developer on call.
• Blogs, brochure sites, and WooCommerce stores that need a quick SSL pass.
• Site owners who want SSL checks and mixed content fixes in one plugin.

The annoying part: it can feel like too much plugin for one small warning. If the only problem is one old image URL in a footer widget, installing a full SSL tool may feel heavy. Also, some premium security prompts may distract users who only want the lock icon fixed.

Cloudflare: Best as a CDN-Level Safety Net

Cloudflare works differently. It does not sit inside WordPress content. It sits between visitors and the website. Its SSL and rewrite tools can force HTTPS connections and rewrite some insecure resource URLs before the page reaches the visitor.

Cloudflare features that often matter here include:

• Always Use HTTPS: redirects HTTP requests to HTTPS.
• Automatic HTTPS Rewrites: tries to rewrite HTTP resource URLs to HTTPS.
• SSL or TLS modes: controls encryption between visitor, Cloudflare, and origin server.
• Page Rules or Redirect Rules: can enforce special redirects.

Cloudflare works well when external resources support HTTPS but are still called with HTTP. It is also useful when a site uses caching, a CDN, or a managed DNS setup. Still, it is not magic. If the origin site sends broken URLs, Cloudflare may not always fix them. It also will not clean up the WordPress database.

Another risk is using the wrong SSL mode. Flexible SSL can create redirect loops or leave the origin connection unencrypted. For WordPress, Full or Full Strict is usually safer when the origin has a valid certificate.

Side-by-Side Comparison

Which One Should a Site Owner Pick?

The practical answer depends on where the problem lives.

• If WordPress was just moved to HTTPS: use Really Simple SSL first.
• If only mixed content remains: use SSL Insecure Content Fixer.
• If Cloudflare already handles DNS and CDN: turn on HTTPS rewrites as a backup.
• If URLs are hardcoded in the database: run a proper search-and-replace after taking a backup.
• If scripts are blocked: fix the original HTTP script URL. Do not rely only on rewrites.

A smart workflow is simple. First, confirm that the SSL certificate works. Next, update WordPress Address and Site Address to HTTPS. Then search the database for old HTTP domain URLs. After that, enable a plugin fix. Finally, use Cloudflare to enforce redirects and catch edge cases.

Performance and Maintenance

Runtime fixes are convenient, but they are not always clean. A plugin that scans page output on every request can add small delays. On a cached site, that delay may be tiny. On a busy WooCommerce store with uncached carts, every extra process matters.

Really Simple SSL can be left active if it handles redirects and headers. SSL Insecure Content Fixer can also stay active, but it is better to solve root causes over time. Cloudflare should remain active if the site uses it for DNS, caching, firewall rules, or CDN delivery.

Best long-term setup: clean HTTPS URLs in WordPress, a valid origin certificate, server-level redirects, and Cloudflare set to Full Strict mode if possible. Plugins should patch gaps, not carry the whole SSL setup forever.

FAQ

Which is better for mixed content: Really Simple SSL or SSL Insecure Content Fixer?

Really Simple SSL is better for a full HTTPS migration. SSL Insecure Content Fixer is better when the site already uses HTTPS and only needs mixed content cleanup.

Can Cloudflare fix all mixed content errors?

No. Cloudflare can rewrite some HTTP resource URLs, but it may not fix hardcoded WordPress content, blocked scripts, or database-level problems.

Should Cloudflare be used with Really Simple SSL?

Yes, they can work together. Really Simple SSL handles WordPress-side settings. Cloudflare handles edge redirects, SSL settings, caching, and rewrites.

Why does the browser still show “Not Secure” after installing SSL?

The certificate may be valid, but the page may still load HTTP resources. Common causes include old images, fonts, scripts, iframes, ads, and page builder content.

Is a plugin enough to fix mixed content permanently?

Sometimes. A plugin can fix output quickly, but permanent repair usually means updating old HTTP URLs in the database, theme files, widgets, and plugin settings.

What is the safest recommendation?

Fix URLs at the source first. Then use Really Simple SSL or SSL Insecure Content Fixer for cleanup. Add Cloudflare as a final safety layer if the site already uses it.