The 2025 Guide to Image Compression: JPG vs. PNG vs. WEBP
In late 2024 and heading into 2025, a fast website isn't a luxury; it's a survival trait. I recently audited a client's site where uncompressed images were causing a 4-second load delay—an eternity in internet time. This guide breaks down exactly which format you should be using right now.
The State of Image Formats Today
For years, the rule of thumb was simple: "JPG for photos, PNG for logos." But the web has moved on. With Google pushing Core Web Vitals harder than ever this month, using the wrong format can tank your SEO score. The rise of WEBP has blurred the lines. It’s not just about making files smaller anymore; it’s about balancing visual fidelity with raw speed.
JPG (JPEG): The Old Reliable
Best for: Photographs and complex real-world scenes. I still rely on JPG for universal compatibility, but its "lossy" nature means quality degrades every time I re-save it. It is terrible for text or sharp lines, but for a header photo of a landscape, it is a solid choice.
PNG: The Crystal Clear Option
Best for: Logos, screenshots, and anything requiring a transparent background. I love PNGs for their crispness and transparency, but they are heavy. I've seen users upload 2MB PNGs for a simple blog image, which destroys mobile performance. Use this only when perfect clarity is mandatory.
WEBP: The New Standard
Best for: Almost everything on the modern web. We ran a test recently converting a library of PNGs to WEBP, and we saw an average file size reduction of 30% with zero visible quality loss. With 97% browser support in 2025, there is almost no reason not to use WEBP as your default.
The Verdict for 2025
If you asked me five years ago, I would have said stick to JPG. Today? Make WEBP your default. It is lighter, faster, and supports transparency. Keep PNGs only for your master files or high-res logos, and use JPGs only as a fallback for ancient devices.