The Most Common Conversion Scenarios
Scenario 1: JPG to WebP (Most Recommended)
When to do it: Any time you're serving a photograph on a website and browser compatibility is not a concern (which, in 2025, it almost never is).
Why it helps: WebP delivers 25–35% smaller file sizes at equivalent visual quality to JPG. Converting your entire photo library from JPG to WebP for web delivery is one of the single highest-impact performance optimizations available.
What you lose: Nothing, in most cases. If you need to edit the image later, keep the original JPG. The WebP is your web-delivery copy.
Watch out for: Some older CMS systems and email clients don't support WebP. For email marketing, stick to JPG. For everything on the web: convert.
Scenario 2: PNG to JPG
When to do it: When you have a PNG photograph (not a graphic/logo) and don't need transparency. PNG photographs are often 5–10x larger than they need to be.
Why it helps: JPG and WebP use lossy compression optimized for photographs. A PNG photo at 4MB can become a JPG at 300KB with no visible quality difference at normal viewing sizes.
What you lose: Transparency (if there was any) and the lossless quality preservation. All subsequent edits on the JPG will further compound compression artifacts.
Never do this for: Logos, icons, screenshots, or images with text — PNG's lossless compression is essential for sharp edges and text. JPG compression creates visible artifacts on sharp lines.
Scenario 3: JPG to PNG
When to do it: Almost never, for web purposes. Converting JPG to PNG doesn't recover lost quality (once the lossy compression has happened, that data is gone forever). You'll just get a larger file with the same quality as the original JPG.
The exception: If you need to layer the image over a background and add transparency in post-processing, or if a tool requires PNG input and you have no other source.
Scenario 4: PNG to WebP
When to do it: For web-delivered graphics, logos, and images with transparency. WebP supports lossless compression with transparency (alpha channel), making it a direct PNG replacement on the web.
Why it helps: Lossless WebP is typically 26% smaller than PNG at identical quality. For icons and UI elements served at scale, this adds up significantly.
Scenario 5: WebP to JPG or PNG
When to do it: For compatibility with tools, platforms, or systems that don't accept WebP. Some image editors, CMS plugins, and older upload systems still require JPG or PNG input.
Why it helps: Enables you to use WebP-sourced images in legacy workflows.
The Golden Rules of Image Conversion
- Always keep originals. Never overwrite your source file with a converted version. Store original RAW or TIFF files, convert to JPG/WebP/PNG for specific uses.
- Avoid lossy-to-lossy chains. Converting JPG → JPG (re-saving) compresses artifacts from the first save. Each generation degrades quality. If you must edit and re-save, use the highest quality setting possible.
- Format for destination, not source. Ask "where will this image be displayed?" not "what format is it in now?" Match the format to the use case, not the workflow history.
- Batch convert, don't do it one at a time. Our converter handles 20 images at once — use batch conversion for efficiency.
Quick Reference Decision Table
| Situation | Convert To | Reason |
|---|---|---|
| Photo for website | WebP | 25–35% smaller, all modern browsers |
| Photo for email | JPG | Email clients don't support WebP |
| Logo for web | SVG or WebP | SVG scales losslessly; WebP supports transparency |
| Screenshot | PNG or WebP lossless | Text and UI elements need lossless compression |
| Product photo (Amazon) | JPG | Amazon requires JPG for main images |
| Social media post | JPG | Platforms re-compress anyway; start optimized |