JPG vs PNG vs WebP: Which Image Format Should You Use?
Choosing the right image format isn’t just a design decision — it directly affects page load speed, SEO rankings, storage costs, and user experience. Google has confirmed that Core Web Vitals (including Largest Contentful Paint, which images heavily influence) are ranking factors. A hero image saved as an uncompressed PNG instead of a properly compressed WebP can add 2-3 seconds to your page load time.
But the answer isn’t “always use WebP” or “always use JPG.” Each format has strengths, weaknesses, and specific situations where it’s the best choice. Here’s when to use each one, with actual numbers and real examples.
JPG (JPEG): The Photograph Standard
JPG has been the default format for photographs since the mid-1990s. It uses lossy compression, meaning it permanently discards some image data to achieve smaller file sizes. The quality parameter (usually 0-100) controls how much data gets discarded.
Best for:
- Photographs and complex images with many colors
- Product photos, hero images, blog post images
- Social media images (Instagram, Facebook, Twitter all convert to JPG internally)
- Any situation where file size matters more than pixel-perfect accuracy
Not ideal for:
- Images with text, logos, or sharp edges (lossy compression creates visible artifacts around high-contrast boundaries)
- Images requiring transparency
- Icons, illustrations, or screenshots with flat colors
- Images that will be edited and re-saved multiple times (each save degrades quality further)
File size reference: A 1920x1080 photograph at quality 80 typically lands between 200-500KB. At quality 60, it drops to 100-250KB with noticeable but often acceptable quality loss.
The sweet spot for quality: For web use, quality 75-85 delivers the best size-to-quality ratio. Below 70, compression artifacts become visible to most people. Above 90, file sizes increase rapidly with minimal perceptible quality improvement. Going from quality 90 to 100 can double the file size while producing a difference invisible to the human eye.
The Image Compressor lets you experiment with different quality levels and see the file size reduction in real time — useful for finding that sweet spot for your specific images.
PNG: The Lossless Workhorse
PNG uses lossless compression, meaning no image data is lost during compression. Every pixel in the output is identical to the input. PNG also supports transparency (alpha channel), which JPG does not.
Best for:
- Logos, icons, and brand assets (sharp edges stay sharp)
- Screenshots and UI mockups (text stays crisp)
- Images with transparency (overlays, stickers, cutouts)
- Images with flat colors and limited color palettes (PNG compresses these extremely well)
- Source files that will be edited later (no generation loss)
- Diagrams, charts, and infographics with text
Not ideal for:
- Photographs (file sizes are 3-10x larger than equivalent JPGs with no visible quality advantage)
- Large images where file size is critical
- Animation (use GIF, WebP, or video instead)
File size reference: A 1920x1080 screenshot with UI elements might be 300-800KB as PNG. The same dimensions as a photograph could be 2-5MB. A simple logo at 200x200 might only be 5-15KB.
PNG-8 vs PNG-24: PNG-8 uses a 256-color palette (like GIF) and produces much smaller files for simple graphics. PNG-24 uses full 24-bit color (16.7 million colors). If your image has fewer than 256 colors — most logos and simple icons do — PNG-8 produces dramatically smaller files with zero quality loss.
WebP: The Modern All-Rounder
Google developed WebP to replace both JPG and PNG with a single format that handles both lossy and lossless compression. WebP consistently produces files 25-35% smaller than equivalent JPGs and 25-50% smaller than equivalent PNGs.
Best for:
- Web images of any type (photos, graphics, icons)
- Sites where performance is a priority (e-commerce, media, SaaS)
- Serving images to modern browsers (global WebP support is 97%+ as of 2026)
- Images that need both quality and small file sizes
- Transparent images that also need lossy compression (something PNG can’t do)
Not ideal for:
- Print production workflows (limited software support outside browsers)
- Email HTML templates (some email clients still don’t support WebP)
- Images shared on platforms that strip WebP and re-encode (some social platforms)
- Archival purposes where you need universal format support decades from now
File size reference: A 1920x1080 photograph at quality 80 in WebP is typically 150-350KB — roughly 25-30% smaller than the same image at quality 80 in JPG.
Browser support: WebP is supported in Chrome, Firefox, Safari (since version 14), Edge, and all major mobile browsers. The only notable holdout was older Safari versions, but that hasn’t been relevant since 2021. If you need to support Safari 13 or earlier (you almost certainly don’t), use the <picture> element with a JPG fallback.
AVIF: The Next Generation
AVIF deserves a mention as the next-generation format gaining traction. Based on the AV1 video codec, AVIF produces files 50% smaller than JPG and 20% smaller than WebP at equivalent quality. It supports HDR, wide color gamut, and transparency.
The catch: encoding is slow (10-50x slower than WebP), browser support is at 92% (as of early 2026), and tooling is still maturing. For most sites, WebP is the practical choice right now. Keep an eye on AVIF for 2027 and beyond.
Direct Comparison: Same Image, Different Formats
Here’s what the numbers look like for the same 1920x1080 photograph at equivalent visual quality:
| Format | File Size | Quality | Transparency |
|---|---|---|---|
| JPG (quality 80) | 380 KB | Lossy | No |
| PNG-24 | 2.4 MB | Lossless | Yes |
| WebP (quality 80) | 265 KB | Lossy | Yes |
| AVIF (quality 80) | 190 KB | Lossy | Yes |
And for a 400x400 logo with flat colors and transparency:
| Format | File Size | Quality | Transparency |
|---|---|---|---|
| JPG (quality 90) | 35 KB | Lossy (artifacts visible) | No |
| PNG-8 | 12 KB | Lossless | Yes (1-bit) |
| PNG-24 | 45 KB | Lossless | Yes (8-bit) |
| WebP (lossless) | 18 KB | Lossless | Yes |
Notice how the “best” format changes depending on the image type. For the photograph, WebP wins decisively. For the simple logo, PNG-8 actually beats WebP because the image is so simple that PNG’s deflate compression is optimal.
How to Choose: A Decision Framework
Use this quick decision tree:
-
Does the image need transparency?
- Yes, and it’s a photo/complex image: WebP (lossy with alpha)
- Yes, and it’s a logo/icon with few colors: PNG-8
- Yes, and it’s a logo/icon with gradients: PNG-24 or WebP (lossless)
- No: continue to step 2
-
Is it a photograph or complex image?
- Yes: WebP (lossy). Fall back to JPG if WebP isn’t supported.
- No: continue to step 3
-
Is it a screenshot, diagram, or image with text?
- Yes, few colors: PNG-8
- Yes, many colors: PNG-24 or WebP (lossless)
-
When in doubt: WebP lossy at quality 80.
Optimizing Images for the Web
Choosing the right format is step one. Proper optimization is step two. Even a WebP image can be wastefully large if it’s 4000px wide on a page where it’s displayed at 800px.
Resize first, compress second. A 4000x3000 photo compressed to quality 60 is still larger than a 1600x1200 photo at quality 85. Always resize to the largest display size you need before compressing. The Image Resizer handles this — set your target dimensions and the image is resized in your browser before you download it.
Use responsive images. The srcset attribute lets you serve different sizes for different screen widths. A phone doesn’t need a 1920px image that a desktop monitor does.
<img
src="photo-800.webp"
srcset="photo-400.webp 400w, photo-800.webp 800w, photo-1200.webp 1200w"
sizes="(max-width: 600px) 400px, (max-width: 1200px) 800px, 1200px"
alt="Description"
/>Batch convert to WebP. If you’re migrating an existing site from JPG/PNG to WebP, the Image Format Converter handles one-off conversions. For large batches, cwebp (Google’s command-line tool) or sharp (Node.js) can process entire directories.
Strip metadata. Photos from cameras and phones contain EXIF data — camera model, GPS coordinates, timestamps, color profiles. This data can add 20-100KB per image and is rarely needed on the web. Most image compressors strip EXIF by default. Our Image Compressor removes metadata automatically while letting you control the quality level.
Lazy load below-the-fold images. Use loading="lazy" on images that aren’t visible on initial page load. This doesn’t reduce file size, but it prevents unnecessary downloads and dramatically improves initial page load time.
The Bottom Line
For most web projects in 2026, the answer is WebP for everything, with PNG for logos/icons that need perfect edges and transparency, and JPG as a fallback only when legacy support is genuinely required. That simple rule covers 95% of cases.
Don’t overthink format selection. A properly sized and compressed JPG is better than an unoptimized WebP. Focus on getting the dimensions right, the quality level right, and the format right — in that order. The format is the smallest lever of the three, but the easiest one to get right.