# Website does not accept WebP format: how to convert and upload?

Source: https://1kapps.com/en/app/webp-to-jpg-png/articles/website-does-not-accept-webp-how-to-convert
Language: en
Publisher: 1kApps
Published: 2026-11-05 15:25:11 UTC
Updated: 2026-11-05 17:15:01 UTC
App: https://1kapps.com/en/app/webp-to-jpg-png

![Mug photos converted from WebP to JPG and accepted in a product listing form.](https://1kapps.com/uploads/articles/198/cover/3c8bb0a146452511f931ae6a.webp)

You are listing products on Amazon, eBay, Shopify, or an e-commerce platform. Or perhaps you are submitting photos to a real estate portal, job board, or application form. When uploading your images, the site throws an error: \*\*“Invalid file format: please upload only JPG or PNG files”\*\* or \*\*“Unsupported media type”\*\*. When checking your files, they all have a \*\*.webp\*\* extension.

## Why do upload portals and marketplaces reject WebP?

Many established e-commerce platforms, enterprise databases, and legacy listing portals rely on backend image pipelines built years ago. These systems strictly expect traditional formats such as JPG or PNG to generate consistent thumbnails, calculate watermarks, and feed product listings.

When a WebP file is uploaded, form validation halts the submission immediately to prevent broken product galleries or catalog rendering issues.

## How to convert batches of photos in seconds

Converting a single file takes only moments. But when you need to list ten, twenty, or fifty product shots, converting one image at a time becomes an exhausting bottleneck.

In \[WebP to JPG and PNG\](https://1kapps.com/en/app/webp-to-jpg-png), you can drop ==all your WebP files simultaneously== onto the workspace. The tool converts every image sequentially with impressive speed and provides a single button to download everything neatly bundled inside a ZIP package.

## Control megabyte size to meet upload caps

Most listing portals and web forms enforce strict file size ceilings (such as 2 MB or 5 MB per image). While converting in our app, you can slide the quality control to make your JPG files lightweight without sacrificing the crisp clarity that sells your items.

You can also set maximum pixel width limits, ensuring your pictures comply effortlessly with marketplace specifications.

## Privacy and security for commercial files

If the photos you are processing contain sensitive product previews, supplier invoices, or client assets, your privacy is fully protected. Conversions run entirely on your own desktop or phone without transmitting any pictures to external servers. Your business data remains exclusively yours.

## Related articles

If you also need to use web images inside desktop software, read \[what to do when a WebP file will not open in Photoshop or Word\](https://1kapps.com/en/app/webp-to-jpg-png/articles/webp-file-will-not-open-in-photoshop-or-word). If your images are icons or branding cutouts, check out \[how to convert WebP to PNG while keeping transparent background\](https://1kapps.com/en/app/webp-to-jpg-png/articles/convert-webp-to-png-transparent-background).