I’m trying to generate an image using the ChatGPT Image Generation node, then convert it from PNG → WebP in n8n, and finally upload it to WordPress via REST API.
The PNG is generated successfully, but when I try to convert it to WebP using either the Image node or a Function node with sharp, the result doesn’t seem to work correctly for upload — it either uploads as a broken image or fails to convert at all.
I’d like to know:
What is the correct way to convert an image generated by the OpenAI Image node (PNG) into WebP format inside n8n Cloud?
Is there a known limitation with the Image node when handling this?
Hi there, i would suggest you to use a 3rd party API within n8n cloud for this, such an convertAPI or cloudconvert
for cloud convert you can see the documentation here on how to implement it, and i believe they have some free quota for you to try it out if im not mistaken
You can create webp-images directly with gpt-image-1. In order to use the OpenAI API with a request body optimized for your needs, you may replace the ChatGPT Image Generation node with a HTTP request node (method POST, url: https://api.openai.com/v1/images/generations)
