At Sympley, we spend a huge amount of time improving website performance for our clients—especially during our ongoing WordPress maintenance service. One of the most overlooked performance factors is something deceptively simple: image file types.
An image file type refers to the format in which an image is saved and delivered to browsers—such as JPG, PNG, SVG, or WebP. Each format has its own strengths, limitations, compression methods, and ideal use cases. Choosing the wrong one can drastically slow your website down, while selecting the right one can improve load times, SEO, and overall user experience.
A Look Back: Key File Types Used Historically
For many years, websites primarily relied on a handful of standard image formats:
JPG / JPEG – The go-to format for photos. Small file sizes, decent quality, and near-universal browser support. Historically the best option for large image areas and photography.
PNG – Designed for sharper detail and transparency. PNGs were widely used for icons, logos, and UI elements. However, they produce much larger file sizes compared to JPG, making them less suitable for full-width images or photography.
GIF – Traditionally used for simple animations. While still around, GIFs are largely outdated due to poor compression and limited colour range.
These file types served the early web well, but modern performance expectations require more efficient solutions.
The Recommended Image File Types for 2025
With speed, accessibility, and cross-device optimisation becoming more important than ever, here are the file types we recommend in 2025:
WebP – The Modern Standard (With One Caveat)
WebP offers excellent compression, resulting in smaller files without noticeable quality loss. It’s ideal for both photos and illustrations. The main downside? Not all browsers fully support WebP, especially older devices or niche browsers. For this reason, we still recommend fallback versions (e.g., JPG or PNG) when using WebP in production environments.
JPG / JPEG – Still Essential
Even in 2025, JPG remains a reliable workhorse. It’s still the best choice for:
- Full-width banners
- Photography
- Blog images
- Product photos (when not using WebP)
It provides good quality at a tiny file size—exactly what modern websites need.
PNG – Only When Truly Needed
PNG should not be used for full photos or large hero banners due to massive file sizes.
Instead, use PNG only for:
- Icons
- Transparent background graphics
- UI elements that require crisp, pixel-perfect edges
If you’re using PNGs for photos, you’re slowing your site down significantly.
SVG – The Best Choice for Logos & Icons
SVG (Scalable Vector Graphics) is the recommended format for:
- Logos
- Icons
- Illustrations
- UI shapes
- Line graphics
They load instantly, scale infinitely at perfect quality, and are extremely small in size.
If your logo or icon set is not in vector format, it’s worth converting it. You can use a vector tracing service—many freelancers on Fiverr provide this service affordably and quickly.
Why File Types Matter: Performance & SEO
Image file types directly affect:
- Page speed
- Core Web Vitals
- SEO rankings
- User experience
- Mobile performance
- Hosting and bandwidth usage
Heavy images result in slow load times, frustrated users, and reduced conversions. Choosing the correct format is one of the simplest but most high-impact improvements you can make.
Here at Sympley, we regularly audit and optimise image libraries as part of our WordPress maintenance service. We ensure your website is using the best possible formats, compression tools, and delivery methods to maximise both quality and speed.
Make Sure It Counts
If you’re unsure whether your current website is using the right image file types—or if you’d like a professional review of your image optimisation workflow—reach out to us here at Sympley. We can assess your entire website, recommend improvements, and help you implement the best modern image standards for 2025 and beyond.
Let us help you create a faster, cleaner, and better-performing website.
