The Short Answer
Use JPG for photographs and images with many colours, PNG for graphics that need transparency or have text, and WebP for everything on modern websites where file size matters. That said, the right choice depends heavily on context — and getting it wrong can cost you loading speed, quality, or compatibility.
| Feature | JPG | PNG | WebP |
|---|---|---|---|
| Compression | Lossy | Lossless | Both |
| Transparency | ❌ No | ✅ Yes | ✅ Yes |
| File Size | Small | Medium–Large | Very Small |
| Best For | Photos | Logos, Graphics | Web Images |
| Browser Support | Universal | Universal | 95%+ (2025) |
| Colour Depth | 16.7M colours | 16.7M+ colours | 16.7M+ colours |
| Animation | ❌ No | ❌ No (use APNG) | ✅ Yes |
JPG (JPEG) — The Photographer's Format
JPG (Joint Photographic Experts Group) was created in 1992 and became the dominant format for digital photographs because it delivers excellent quality at dramatically reduced file sizes using lossy compression. At 80% quality, a JPG photo is typically 5–10× smaller than the raw image with almost no visible degradation.
How JPG compression works: JPG divides the image into 8×8 pixel blocks and uses discrete cosine transform (DCT) to discard colour information that the human eye is less sensitive to — particularly fine colour gradients. This is why JPG is perfect for photographs (millions of smooth colour transitions) but terrible for screenshots or logos with sharp edges, where compression artefacts appear as ugly blocky distortions.
✅ Use JPG when:
- • Sharing photos on WhatsApp, Instagram, or email
- • Uploading product photos to e-commerce sites like Flipkart or Amazon
- • Displaying portrait or landscape photography on a website
- • File size must be kept small (under 500KB per image)
❌ Avoid JPG when:
- • The image has text, sharp lines, or is a logo
- • You need a transparent background
- • You will edit and re-save the image multiple times (quality degrades each save)
PNG — The Designer's Format
PNG (Portable Network Graphics) was created in 1996 as a patent-free replacement for GIF. Its defining feature is lossless compression — every single pixel is preserved exactly. PNG also supports full alpha transparency (24-bit), making it the standard for logos, icons, UI elements, and any image that needs a transparent background.
PNG-8 vs PNG-24: PNG comes in two variants. PNG-8 supports only 256 colours (like GIF) and produces very small files for simple graphics. PNG-24 supports 16.7 million colours and full 8-bit transparency — this is what you typically mean when you say "PNG". PNG-24 files are significantly larger than equivalent JPGs.
✅ Use PNG when:
- • The image needs a transparent background (logos on websites)
- • The image contains text with sharp edges
- • Saving screenshots or UI mockups
- • Image quality must be pixel-perfect (medical imaging, technical diagrams)
WebP — The Modern Web Format
WebP was developed by Google in 2010 and has become the recommended format for web images. It supports both lossy and lossless compression, transparency, and animation — essentially combining the best features of JPG, PNG, and GIF into one format with significantly better compression efficiency.
How much smaller is WebP? According to Google's own studies: WebP lossy images are 25–34% smaller than equivalent JPG images. WebP lossless images are 26% smaller than equivalent PNGs. For a typical Indian e-commerce website with 50 product images, switching to WebP can reduce total image data by 30–40%, directly improving page load time.
✅ Use WebP when:
- • Optimising images for a website or web app
- • Building Next.js, React, or any modern web application
- • You need Core Web Vitals scores (LCP) to be high
- • Replacing both JPGs and PNGs with a single modern format
⚠️ WebP compatibility caveat:
WebP is supported by all modern browsers (Chrome, Firefox, Safari, Edge) and covers 95%+ of users in 2025. However, some older Android apps and email clients may not support WebP — for email marketing, stick with JPG/PNG.
File Size Comparison: Real-World Example
Taking a 4000×3000px professional photograph as a baseline:
| Format | Typical File Size | Quality Loss |
|---|---|---|
| RAW / Uncompressed | ~25 MB | None |
| PNG-24 | ~8–15 MB | None |
| JPG (80% quality) | ~2–4 MB | Minimal |
| JPG (60% quality) | ~800 KB–1.5 MB | Slight |
| WebP (80% quality) | ~1.5–3 MB | Minimal |
| WebP (60% quality) | ~600 KB–1 MB | Slight |
Quick Decision Guide
📷 Use JPG
Photos, product images, social media posts, email attachments
🎨 Use PNG
Logos, icons, screenshots, images with transparency
🌐 Use WebP
Website images, web apps, anything optimised for browsers
Converting Between Formats
Need to convert between image formats? ToolsWallet's free Image Format Converter lets you convert JPG to PNG, PNG to WebP, WebP to JPG, and more — entirely in your browser, no upload, no signup, no watermark.
For bulk compression of existing images, use the Image Compressor to reduce file sizes by up to 80% before serving them to users.