diff --git a/umap/static/umap/js/umap.core.js b/umap/static/umap/js/umap.core.js
index e3ce8f02..2cf791ba 100644
--- a/umap/static/umap/js/umap.core.js
+++ b/umap/static/umap/js/umap.core.js
@@ -260,6 +260,18 @@ L.Util.hasVar = (value) => {
   return typeof value === 'string' && value.indexOf('{') != -1
 }
 
+L.Util.isPath = function (value) {
+  return value && value.length && value.startsWith('/')
+}
+
+L.Util.isRemoteUrl = function (value) {
+  return value && value.length && value.startsWith('http')
+}
+
+L.Util.isDataImage = function (value) {
+  return value && value.length && value.startsWith('data:image')
+}
+
 L.Util.copyToClipboard = function (textToCopy) {
   // https://stackoverflow.com/a/65996386
   // Navigator clipboard api needs a secure context (https)
diff --git a/umap/static/umap/js/umap.forms.js b/umap/static/umap/js/umap.forms.js
index fb7a41c1..b3970973 100644
--- a/umap/static/umap/js/umap.forms.js
+++ b/umap/static/umap/js/umap.forms.js
@@ -538,8 +538,8 @@ L.FormBuilder.IconUrl = L.FormBuilder.BlurInput.extend({
     this.footer.innerHTML = ''
     this.buildTabs()
     const value = this.value()
-    if (!value || value.startsWith('/')) this.showSymbolsTab()
-    else if (value.startsWith('http')) this.showURLTab()
+    if (!value || L.Util.isPath(value)) this.showSymbolsTab()
+    else if (L.Util.isRemoteUrl(value) || L.Util.isDataImage(value)) this.showURLTab()
     else this.showCharsTab()
     const closeButton = L.DomUtil.createButton(
       'button action-button',
@@ -596,18 +596,11 @@ L.FormBuilder.IconUrl = L.FormBuilder.BlurInput.extend({
     this.body.innerHTML = ''
   },
 
-  isPath: function () {
-    const value = this.value()
-    return value && value.length && value.startsWith('/')
-  },
-
-  isRemoteUrl: function () {
-    const value = this.value()
-    return value && value.length && value.startsWith('http')
-  },
-
   isImg: function () {
-    return this.isPath() || this.isRemoteUrl()
+    const value = this.value()
+    return (
+      L.Util.isPath(value) || L.Util.isRemoteUrl(value) || L.Util.isDataImage(value)
+    )
   },
 
   updatePreview: function () {
@@ -731,7 +724,10 @@ L.FormBuilder.IconUrl = L.FormBuilder.BlurInput.extend({
 
   showURLTab: function () {
     this.openTab('url')
-    const value = this.isRemoteUrl() ? this.value() : null
+    const value =
+      L.Util.isRemoteUrl(this.value()) || L.Util.isDataImage(this.value())
+        ? this.value()
+        : null
     const input = this.buildInput(this.body, value)
     input.placeholder = L._('Add image URL')
     input.type = 'url'