[damir]

I believe tiddlywiki stores PNGs as base64 strings, so image is always there.

Yes, the file can grow large with many images, but it's a single file containing everything... even scripting!

[bayindirh]

Yes, it embeds all attachments as base64.

TiddlyWiki is great until you want to add a structure to your Wiki. I was using it like mad, then I found out that linking pages took more time then writing notes, and I pulled the trigger and moved to Obsidian.

[Tomte]

If you run the node.js server version it can handle images properly, as separate files. That also gives you the practical ability to use many large images and videos.