Here's a list of all the significant updates that has been made to the website, sorted from newest to oldest.
The list of updates for the generators, if they have them, are listed in their page.
Despite having a maximum size of 67x70 px, many people keeps uploading Undertale Textbox sprites up to 10 times that size. From now on you will get a warning when you select a sprite that exceeds the maximum size, and in the near future the image will be automatically resized before uploading (which means it can get blurry permanently if you didn't keep a copy).
You're reading a specific update. To see all of them go to the news page.