How to Convert HTML to PNG on a Serverside?

Question

Hello everyone!I need an advice. I work on a web app, that needs to send PNG images to users based on their achievements. The easiest way to do that is to construct an HTML that contains all the information, make a screenshot of it and finally upload it to the server. But this solution is extremely not optimal.So I'm curious how to implement the same logic, but without frontend involvement in terms of image generation. I know that there are many commercial libs and services for that, but maybe there is some open-source more or less good libs for that.I'm fine to work with Java, Scala, NodeJS or Golang.Any advice is welcome!

j45 · Accepted Answer

Not quite HTML, another way to similar output:
Both of the below should have a library you can use to generate the text into an image, if you don't want to work with them directly.
http://www.graphicsmagick.org
https://imagemagick.org/index.php

jeanvalmarc · Answer

https://wkhtmltopdf.org/

onesmallcoin · Answer

I'm currently bootstrapping an api/sass that takes any url and converts it to an image. It runs on top of chromium and uses the CDP protocol to do cool things like automate basic auth, custom http headers, injected js, mock mobile templates and device emulation, custom interactions with the webpage, it can also return json or upload the results to dropbox, s3, or google cloud storage. I'm looking to chat with people interested in this kind of technology as I polish off the final touches on the API and get the product live!What kind of features would be useful to you if you were to go the API route for something like this?

dustinmr · Answer

This arrived in my RSS feed today. Seems to fit the bill.https://www.thepolyglotdeveloper.com/2019/12/generate-images...

Grazester · Answer

There are libraries for converting HTML to PNG. Why would you need the frontend for anything?
Grab the users' achievement from the database(I could only assume user data is stored here). Format it however you want it to look in an HTML file then convert said HTML to a PNG. Its dead simple.
I did the equivalent but with PDF's for customer bills for a past job.

perilunar · Answer

Does it need to be HTML? SVG is easy to generate programmatically, and doesn't need to be converted.

chriskinsman · Answer

Headless chrome/puppeteer...