I've been seeing a lot of the same questions about watermarking over the last week, so I made this playground that lets you try out 3 different watermarking schemes (including a version of SynthID-Text) on your own text: https://watermark.keito.me/ to understand it experientially myself. I found it illustrative to try different examples like code, text rewriting, etc. to see how it affected the tokens. Playing around with the detector is interesting too to see how much of the watermark can remain in edited text. I hope this is helpful for others too.