Get certified for free when you join Fabric Data Days 2026 and dive into Fabric, Power BI, SQL, AI, and other essential data skills.
Join nowData Days is here! Join us now for 60+ days of learning, challenges, and connection. Learn more
Does anyone have a working json file that updates the font and font size? The defaults are horrific. I've tried the theme generator and example from curbal but neither actually work.
Hi @cdknuth,
Maybe you can refer to following link which told about custom theme elements.
Custom Report Theme JSON Property settings in Tables/Matrix
Regards,
Xiaoxin Sheng
Thanks, Xiaoxin. I've tried these formats and neither work.
{
"name":"Jan 2018 Theme",
"dataColors":
[
"#0069aa",
"#4f8dc2",
"#9ab7da",
"#cedaec",
"#00c762",
"#fbe7a6",
"#ff544a",
"#f89a1c",
"#545451"
],
"background":"#FFFFFF",
"foreground":"#545451",
"tableAccent":"#4f8dc2",
"visualStyles":{
"*":{
"*": {
"*": {[ "fontFamily":"Segoe UI"]}
}
}
}
}
{
"name":"Jan 2018 Theme",
"dataColors":
[
"#0069aa",
"#4f8dc2",
"#9ab7da",
"#cedaec",
"#00c762",
"#fbe7a6",
"#ff544a",
"#f89a1c",
"#545451"
],
"background":"#FFFFFF",
"foreground":"#545451",
"tableAccent":"#4f8dc2",
"visualStyles":{
"*":{
"*": {
"*": [{ "fontFamily":"Segoe UI"}]
}
}
}
}
HI @cdknuth,
You can try to use below json formula and replace bold part with a valid font name.
{
"name":"Jan 2018 Theme",
"dataColors":[
"#0069aa",
"#4f8dc2",
"#9ab7da",
"#cedaec",
"#00c762",
"#fbe7a6",
"#ff544a",
"#f89a1c",
"#545451"
],
"background":"#FFFFFF",
"foreground":"#545451",
"tableAccent":"#4f8dc2",
"visualStyles":{
"*":{
"*":{
"*":[
{
"fontFamily":"Segoe UI"
}
]
}
}
}
}
Regards,
Xiaoxin Sheng
Thanks for the attempt, but this still doesn't work for me. Perhaps I need a newer version.
HI @cdknuth,
Maybe you can try to use below json file, I package code and confirm it works on my side.
Regards,
Xiaoxin Sheng
Don't miss out on Data Days, June 15 through August 7. Learn Fabric, Power BI, SQL, AI and more.
Check out the May 2026 Power BI update to learn about new features.
| User | Count |
|---|---|
| 23 | |
| 23 | |
| 20 | |
| 18 | |
| 14 |
| User | Count |
|---|---|
| 58 | |
| 51 | |
| 41 | |
| 30 | |
| 24 |