Following the lead of other vendors, now Adobe itself is abandoning support for the venerable “Type 1” font format that it created <https://arstechnica.com/gadgets/2023/08/microsoft-adobe-and-others-have-dropped-support-for-old-postscript-fonts/>. Back in the days when PostScript printers were new and wonderful things, the PostScript language was an open, published spec, but the high-quality font format that Adobe’s printers used was not. This format included a “secret sauce” in the form of “hints” to the rasterizer that smoothed out irregularities. Because if you took letter shapes expressed as scalable vector graphics and tried rendering them in a straight geometric fashion at typical text sizes on a black-and-white output device, even at as high as 300 dpi, there would be a noticeable roughness to the shapes. Nowadays the techniques for applying such hinting are no longer such a big secret. However, I take issue with this bit: ... it's possible that you created a document in 2022 that you simply won't be able to open in 2023. The change will also cause problems if you open and work with decades-old files with any kind of regularity; files that use Type 1 fonts will begin generating lots of "missing font" messages ... As far as I know, office-type and layout-type apps do not typically embed fonts in the document. Instead, they store font-matching information (family name, weight etc) that will be used to find the best available fonts when the document is next opened, perhaps on a different system. Remember, it is only the old font format that is being dropped; the same classic, professional-quality font designs that people have been using for years or decades will still be available, just in the newer formats. So a proper font match, if it is installed, can still be found. A self-contained document format like PDF does embed fonts (typically only in subset form), but that has its own internal font representation, so it should not be affected by the demise of Type-1. This part is true, though: You'll also either need to convert any specialized PostScript Type 1 font that you may have paid for in the past or pay for an equivalent OpenType alternative. This article <https://www.prepressure.com/fonts/basics/history> is a good potted history of font formats (the important ones, at any rate). By the way, I don’t think the open-source FreeType library is dropping support for Type-1 font rendering any time soon. It still handles Multiple Master fonts, which Adobe gave up on a long time ago.