WebP vs JPG: Which Should You Use?

What changes between WebP and JPG?

JPG and JPEG are names for the same image format. WebP is a different format with both lossy and lossless compression modes and support for transparency. JPEG is widely supported for photographic images but does not retain a transparent background. These are format capabilities; a particular converter may offer only some of them. See Google’s WebP documentation for the format’s capabilities.

When should you use WebP?

For a website you control, export a WebP version from the original photograph and compare it with the existing JPG. Look at hair, foliage, fabric and lettering. A smaller export is useful only if it still looks right where you plan to use it. A thumbnail can tolerate choices that look poor in a full-width portfolio image.

Use JPG to WebP for this comparison. Keep both versions until you have checked the actual page. Do not assume that setting two different encoders to “80” produces equivalent quality: treat each control as a starting point for visual inspection.

Original JPGPixilo WebP

When is JPG the better choice?

Choose JPG when compatibility is the immediate problem: a submission form rejects WebP, an older editor cannot open it, or a client specifically asks for JPEG. The goal here is a usable file, even if the resulting JPG is larger. Use WebP to JPG and open the downloaded file in the destination application before deleting anything.

If the image has transparent areas, decide on a background first. A white product cutout that looks correct on a white page may look wrong against a dark slide. Use the background color tool when you need to choose a solid background deliberately.

Does conversion reduce image quality?

Yes, converting to a lossy format can change detail. A small compression difference may be invisible in a thumbnail but noticeable in a large image. Compare the result at its actual display size, especially small text and textured areas.

In Pixilo, the JPG/WebP converters use a quality slider and browser encoding. They are not a promise of lossless conversion. Images larger than 4000 pixels on either side are resized proportionally so the longest side is 4000 pixels. A large original may therefore change in both dimensions and encoding.

Here, 100% means viewing the image at its actual pixel size in an image viewer: one image pixel is shown as one screen pixel. The browser’s page zoom is a separate setting.

A practical comparison workflow

1. Choose one representative photo, including fine detail or text if those matter to your project.
2. Decide its displayed dimensions and whether you need a larger version for high-pixel-density screens.
3. Export from the original, then inspect at normal viewing size and at 100% zoom.
4. Compare downloaded file sizes. Keep the original if the new file is larger without a useful compatibility benefit.
5. Check the actual destination: website, email attachment or upload form.

Pixilo processes the selected image locally in your browser rather than uploading it for conversion. Keep the original separately, especially for print, archival work or future edits. For a broader decision, read the website image format guide.