HubSpot WebP Woes: Why Your Images Show Up as PNGs (and How to Fix It)

Hey ESHOPMAN community!

We all know that in the world of e-commerce, speed is king. Every millisecond counts, especially when you're trying to captivate potential customers and encourage them to convert. That's why optimizing your site for performance, including using modern image formats like WebP, is a top priority for anyone looking to build your online store successfully. But what happens when you do all the right things, upload your shiny new WebP images to HubSpot, and then find them mysteriously showing up as old-school PNGs on your live site?

That's exactly the head-scratcher one of our fellow HubSpot users brought up in a recent HubSpot Community discussion, and it's a fantastic example of the subtle nuances of working with HubSpot's powerful platform.

The Case of the Vanishing WebP

The original poster in the thread was trying to improve page rendering by replacing legacy CTA banner PNGs with WebP files. They confirmed in the HubSpot CTA builder that the file was indeed WebP. However, once embedded on a page, the image consistently displayed as a PNG. Talk about frustrating!

It's a common scenario: you've done your due diligence, converted your images, and expect to see those performance gains, only to be met with an unexpected format. This prompted a great discussion that peeled back the layers of how HubSpot handles image optimization behind the scenes.

HubSpot's Automatic Optimization: A Double-Edged Sword?

A community moderator quickly jumped in, shedding some light on HubSpot's built-in image optimization. It turns out that HubSpot automatically optimizes JPG/JPEG/PNG images. It delivers WebP versions to compatible browsers while serving the original formats to users. This sounds great in theory, right?

The original poster then asked for clarification: "If I'm understanding correctly, are you saying that HubSpot serves WebP to crawlers like Google (thus improving the page load performance as measured by PageSpeed Insights), while a user will see a PNG?" This is a crucial question for anyone serious about both SEO and user experience.

While the moderator's initial response implied a distinction between what crawlers see and what users see, the full picture is a bit more nuanced. HubSpot does convert images on the fly to WebP for supported browsers, but there are situations where you might still see the original or a different format, especially with existing assets or specific HubSpot tools like the legacy CTA builder.

Unpacking HubSpot's CDN and Image Resizing

Another insightful community member provided the key piece of the puzzle: what you're seeing is likely due to HubSpot’s Automatic Image Resizing and how its Content Delivery Network (CDN) handles caching. Even if you upload a WebP, HubSpot’s CDN often processes images to ensure they match the dimensions defined in the CTA builder or elsewhere on your site. When you 'replace' an image in an existing CTA, the CDN might still be serving a cached version of the legacy format.

This is where the distinction becomes important for those of us running e-commerce sites. We want full control and predictable performance.

Actionable Steps to Verify and Resolve

So, what can you do if you're facing this WebP-to-PNG conundrum? Here are a few practical steps based on the community's insights:

1. Test with the ?no_upscale Parameter: This is a neat trick! As one expert suggested, try adding ?no_upscale to the end of your image URL in the file manager. This parameter can sometimes bypass HubSpot's automatic resizing, forcing it to serve the exact image you uploaded.
2. Create a Completely New CTA: Instead of replacing an image in an existing CTA, try creating a brand new CTA with your WebP file. This can help prevent the CDN from serving a cached legacy format associated with the old CTA.
3. Check Your Network Tab in DevTools: This is your best friend for debugging. Open your browser's developer tools (usually F12), go to the Network tab, and refresh your page. Inspect the image requests. HubSpot sometimes serves WebP content even if the file extension in the URL still says .png! The 'Type' column in DevTools will show you the actual content type being delivered (e.g., image/webp). This is the definitive way to know what the user's browser is truly receiving.
4. Understand HubSpot's CDN Caching: Be aware that changes to existing assets, especially in older modules or builders, might take some time to propagate through HubSpot's CDN. Clearing your browser cache and giving the CDN time to refresh its cache can sometimes help.

Understanding these intricacies is vital for anyone who relies on HubSpot for their online presence, especially when trying to optimize for speed and user experience. It's not just about uploading the right file; it's about understanding how HubSpot processes and serves those files.

ESHOPMAN Team Comment

This discussion highlights a critical point for e-commerce operators using HubSpot: while HubSpot provides excellent foundational optimization, the specifics of its CDN and caching for image assets, especially with legacy tools like the old CTA builder, can be tricky. We believe HubSpot should offer more transparent control over image serving, allowing users to explicitly force WebP delivery without workarounds. For ESHOPMAN users, this means always verifying your image formats via DevTools and being mindful that 'replacing' assets might not always yield immediate, expected results.

Optimizing your images is a cornerstone of a high-performing e-commerce site, driving everything from SEO rankings to conversion rates. Whether you're just starting to build your online store or refining an existing one, delving into these technical details will pay dividends. Keep leveraging the HubSpot Community and tools like DevTools to ensure your site is always delivering the best possible experience for your customers.