diff --git a/app/src/main/java/com/keylesspalace/tusky/util/SpanUtils.kt b/app/src/main/java/com/keylesspalace/tusky/util/SpanUtils.kt
index 0a6b1ca00..4da9b16d4 100644
--- a/app/src/main/java/com/keylesspalace/tusky/util/SpanUtils.kt
+++ b/app/src/main/java/com/keylesspalace/tusky/util/SpanUtils.kt
@@ -66,7 +66,7 @@ fun Spannable.highlightSpans(colour: Int, finders: List<PatternFinder> = default
 
     for (finder in finders) {
         // before running the regular expression, check if there is even a chance of it finding something
-        if (this.contains(finder.searchString)) {
+        if (this.contains(finder.searchString, ignoreCase = true)) {
             val matcher = finder.pattern.matcher(this)
 
             while (matcher.find()) {
diff --git a/app/src/test/java/com/keylesspalace/tusky/SpanUtilsTest.kt b/app/src/test/java/com/keylesspalace/tusky/SpanUtilsTest.kt
index 6d12f7634..7a369d7bb 100644
--- a/app/src/test/java/com/keylesspalace/tusky/SpanUtilsTest.kt
+++ b/app/src/test/java/com/keylesspalace/tusky/SpanUtilsTest.kt
@@ -115,6 +115,10 @@ class SpanUtilsTest(
             arrayOf("😜https://connyduck.at", listOf(2 to 22)),
             arrayOf("😜#tag", listOf(2 to 6)),
             arrayOf("😜@user@mastodon.example", listOf(2 to 24)),
+            // case should be ignored on protocols https://github.com/tuskyapp/Tusky/issues/4641
+            arrayOf("HTTPS://example.com", listOf(0 to 19)),
+            arrayOf("Http://example.com/test", listOf(0 to 23)),
+            arrayOf("test Https://example.com/test", listOf(5 to 29)),
         )
     }
 
diff --git a/app/src/test/java/com/keylesspalace/tusky/components/compose/StatusLengthTest.kt b/app/src/test/java/com/keylesspalace/tusky/components/compose/StatusLengthTest.kt
index 9b1404dbe..8b2b0113a 100644
--- a/app/src/test/java/com/keylesspalace/tusky/components/compose/StatusLengthTest.kt
+++ b/app/src/test/java/com/keylesspalace/tusky/components/compose/StatusLengthTest.kt
@@ -43,7 +43,7 @@ class StatusLengthTest(
                 arrayOf("🫣", 1),
                 // "@user@server" should be treated as "@user"
                 arrayOf("123 @example@example.org", 12),
-                // URLs under 23 chars are treated as 23 chars
+                // URLs are always treated as 23 even if they are shorter
                 arrayOf("123 http://example.org", 27),
                 // URLs over 23 chars are treated as 23 chars
                 arrayOf("123 http://urlthatislongerthan23characters.example.org", 27),
@@ -52,7 +52,11 @@ class StatusLengthTest(
                 // Long hashtags are *also* treated as is (not treated as 23, like URLs)
                 arrayOf("123 #atagthatislongerthan23characters", 37),
                 // urls can have balanced parenthesis, otherwise they are ignored https://github.com/tuskyapp/Tusky/issues/4425
-                arrayOf("(https://en.wikipedia.org/wiki/Beethoven_(horse))", 25)
+                arrayOf("(https://en.wikipedia.org/wiki/Beethoven_(horse))", 25),
+                // protocols can have any case https://github.com/tuskyapp/Tusky/issues/4641
+                arrayOf("Http://example.org", 23),
+                arrayOf("HTTPS://example.org", 23),
+                arrayOf("HTTPS://EXAMPLE.ORG", 23)
             )
         }
     }