Choosing the wrong image format costs you loading speed, storage, and sometimes quality. Here's a practical breakdown of when to use each.
Quick reference
| Format | Best for | Compression | Transparency | Browser support |
|---|---|---|---|---|
| JPG | Photos, general use | Lossy | No | Universal |
| PNG | Screenshots, graphics with text | Lossless | Yes | Universal |
| WebP | Web publishing | Lossy + Lossless | Yes | 95%+ |
| HEIC | iPhone photos | Lossy | No | Apple devices |
| SVG | Icons, logos | Vector | Yes | Universal |
JPG: the reliable default
JPG's lossy compression makes it ideal for photographs where slight quality loss is imperceptible. A photo at quality 85 in JPG is indistinguishable from the original at roughly 1/5th the file size.
Use when: sharing photos by email, social media uploads, any context where transparency isn't needed and file size matters.
Avoid when: you have text overlays, sharp edges, or need multiple re-saves (each save introduces new compression artifacts).
PNG: when quality is non-negotiable
PNG uses lossless compression. What you put in is exactly what you get out. It also supports transparency (alpha channel), making it the standard for UI assets, logos, and screenshots.
Use when: logos, UI screenshots, images with text, anything that will be edited again later.
Avoid when: file size is a concern for photographs. A PNG photo is typically 3–5x larger than the equivalent JPG.
WebP: the modern web format
Google developed WebP to be better than both JPG and PNG: lossy mode beats JPG by ~25–35% at equivalent quality, and lossless mode beats PNG by ~26%. It supports transparency.
Browser support is now 95%+, making the old "compatibility" concern largely obsolete.
Use when: publishing images on websites, especially where Core Web Vitals / LCP scores matter.
Convert to WebP: xyzconverter.com/jpg-to-webp or xyzconverter.com/png-to-webp
HEIC: Apple's storage optimizer
HEIC achieves roughly 2x the compression of JPG at equivalent quality. Apple uses it by default on iPhones to save storage. The problem: compatibility outside Apple's ecosystem is poor.
Use when: staying within Apple devices and iCloud.
Avoid when: sharing with non-Apple users, uploading to web services, editing in non-Apple software.
Need to convert? xyzconverter.com/heic-to-jpg handles batch conversion entirely in the browser.
The practical 2026 recommendation
- Photos for web → WebP (with JPG fallback for old email clients)
- Photos for print/email → JPG at 85 quality
- UI assets, logos → SVG (if vector) or PNG (if raster)
- Screenshots → PNG
- iPhone photos you need to share → Convert HEIC to JPG first
Format choice has real performance impact. Switching a site's images from PNG to WebP typically reduces image payload by 30–40%, directly improving page load times.
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