Your journal's title field stops taking new characters at 120 characters, and the tagline field stops at 500 characters. That is a hard limit built into the editor, not a fault in your keyboard or your browser. Once a field reaches its limit, typing or pasting further text has no effect until you delete something first.
The counter that explains it only shows while you are inside the field
Each field carries a small character count, but it only renders while that field has focus. Blur out of the title and the counter disappears completely, so if you are watching your draft rather than a corner of the screen, the moment your keystrokes stop landing looks exactly like a stuck key. Click back into the field and the count reappears, and it changes color once you pass 100 characters in the title or 450 in the tagline, a warning before you actually hit the wall.
The limit lives in your browser, not on UNI's servers
Nothing on the backend rejects a longer title or tagline. The database field has no length cap of its own, and the endpoint that saves your edits writes whatever you send it without checking a maximum. The 120 and 500 caps exist only in the editor's own field, which means a journal whose title or tagline was set before this limit existed, or through a path other than this editor, can already be longer than that. If you open one of those to edit it, you will find you cannot type a single extra character anywhere in the field: the stored text is already past the editor's own ceiling, so the browser refuses everything you try to add until you cut it back down.
Bring the field under the limit before you add anything
If typing does nothing in a title or tagline field:
- Click into the field and check the live count. If it reads a full 120/120 or 500/500, delete text until there is room, then continue.
- If the count is nowhere near the limit and typing still does nothing, something else is wrong with the field, not the length cap.
- If you cannot tell what is going on because the field was already full when you opened it, select a chunk of the existing text and delete it first. Once the count drops below the cap, typing resumes normally.
Both fields also decide your journal's permanent address
The title and tagline are not only what readers see. Together they are the raw material UNI turns into your journal's web address the moment you first publish. How a journal's web address is built and why it cannot be changed covers that in full, including why a short title lets more of the tagline show up in the address, and a long one crowds it out entirely.