diff --git a/src/console_cmds.cpp b/src/console_cmds.cpp
index 19c7ed0c8a..8519c0d217 100644
--- a/src/console_cmds.cpp
+++ b/src/console_cmds.cpp
@@ -1899,7 +1899,7 @@ static void OutputContentState(const ContentInfo *const ci)
 	static const char * const states[] = { "Not selected", "Selected", "Dep Selected", "Installed", "Unknown" };
 	static const TextColour state_to_colour[] = { CC_COMMAND, CC_INFO, CC_INFO, CC_WHITE, CC_ERROR };
 
-	IConsolePrint(state_to_colour[ci->state], "{}, {}, {}, {}, {:08X}, {}", ci->id, types[ci->type - 1], states[ci->state], ci->name, ci->unique_id, MD5SumToString(ci->md5sum));
+	IConsolePrint(state_to_colour[ci->state], "{}, {}, {}, {}, {:08X}, {}", ci->id, types[ci->type - 1], states[ci->state], ci->name, ci->unique_id, FormatArrayAsHex(ci->md5sum));
 }
 
 DEF_CONSOLE_CMD(ConContent)
diff --git a/src/gamelog.cpp b/src/gamelog.cpp
index 30e65d543a..05ae5f4ff4 100644
--- a/src/gamelog.cpp
+++ b/src/gamelog.cpp
@@ -109,7 +109,7 @@ void Gamelog::Reset()
 static void AddGrfInfo(std::back_insert_iterator<std::string> &output_iterator, uint32_t grfid, const MD5Hash *md5sum, const GRFConfig *gc)
 {
 	if (md5sum != nullptr) {
-		fmt::format_to(output_iterator, "GRF ID {:08X}, checksum {}", BSWAP32(grfid), MD5SumToString(*md5sum));
+		fmt::format_to(output_iterator, "GRF ID {:08X}, checksum {}", BSWAP32(grfid), FormatArrayAsHex(*md5sum));
 	} else {
 		fmt::format_to(output_iterator, "GRF ID {:08X}", BSWAP32(grfid));
 	}
diff --git a/src/misc.cpp b/src/misc.cpp
index d2d645f059..a22abe3121 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -81,7 +81,7 @@ std::string GenerateUid(std::string_view subject)
 	checksum.Append(coding_string.c_str(), coding_string.length());
 	checksum.Finish(digest);
 
-	return MD5SumToString(digest);
+	return FormatArrayAsHex(digest);
 }
 
 /**
diff --git a/src/network/network.cpp b/src/network/network.cpp
index 2b86cec4fc..561c1df7fd 100644
--- a/src/network/network.cpp
+++ b/src/network/network.cpp
@@ -197,7 +197,7 @@ std::string GenerateCompanyPasswordHash(const std::string &password, const std::
 	checksum.Append(salted_password_string.data(), salted_password_string.size());
 	checksum.Finish(digest);
 
-	return MD5SumToString(digest);
+	return FormatArrayAsHex(digest);
 }
 
 /**
diff --git a/src/network/network_client.cpp b/src/network/network_client.cpp
index 8ba9f30d06..6c14acc5f1 100644
--- a/src/network/network_client.cpp
+++ b/src/network/network_client.cpp
@@ -666,7 +666,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_CHECK_NEWGRFS(P
 		const GRFConfig *f = FindGRFConfig(c.grfid, FGCM_EXACT, &c.md5sum);
 		if (f == nullptr) {
 			/* We do not know this GRF, bail out of initialization */
-			Debug(grf, 0, "NewGRF {:08X} not found; checksum {}", BSWAP32(c.grfid), MD5SumToString(c.md5sum));
+			Debug(grf, 0, "NewGRF {:08X} not found; checksum {}", BSWAP32(c.grfid), FormatArrayAsHex(c.md5sum));
 			ret = NETWORK_RECV_STATUS_NEWGRF_MISMATCH;
 		}
 	}
diff --git a/src/network/network_content_gui.cpp b/src/network/network_content_gui.cpp
index ff049d2d58..f82b807c62 100644
--- a/src/network/network_content_gui.cpp
+++ b/src/network/network_content_gui.cpp
@@ -365,7 +365,7 @@ class NetworkContentListWindow : public Window, ContentCallback {
 				if (!first) url.push_back(',');
 				first = false;
 
-				fmt::format_to(std::back_inserter(url), "{:08X}:{}", ci->unique_id, MD5SumToString(ci->md5sum));
+				fmt::format_to(std::back_inserter(url), "{:08X}:{}", ci->unique_id, FormatArrayAsHex(ci->md5sum));
 			}
 		} else {
 			url += "do=searchtext&q=";
diff --git a/src/network/network_survey.cpp b/src/network/network_survey.cpp
index aa9aa84f11..3f21fdca71 100644
--- a/src/network/network_survey.cpp
+++ b/src/network/network_survey.cpp
@@ -268,7 +268,7 @@ static void SurveyGrfs(nlohmann::json &survey)
 		auto grfid = fmt::format("{:08x}", BSWAP32(c->ident.grfid));
 		auto &grf = survey[grfid];
 
-		grf["md5sum"] = MD5SumToString(c->ident.md5sum);
+		grf["md5sum"] = FormatArrayAsHex(c->ident.md5sum);
 		grf["status"] = c->status;
 
 		if ((c->palette & GRFP_GRF_MASK) == GRFP_GRF_UNSET) grf["palette"] = "unset";
diff --git a/src/newgrf_config.cpp b/src/newgrf_config.cpp
index f596e64f77..235d49a73d 100644
--- a/src/newgrf_config.cpp
+++ b/src/newgrf_config.cpp
@@ -481,7 +481,7 @@ GRFListCompatibility IsGoodGRFConfigList(GRFConfig *grfconfig)
 			 * same grfid, as it most likely is compatible */
 			f = FindGRFConfig(c->ident.grfid, FGCM_COMPATIBLE, nullptr, c->version);
 			if (f != nullptr) {
-				Debug(grf, 1, "NewGRF {:08X} ({}) not found; checksum {}. Compatibility mode on", BSWAP32(c->ident.grfid), c->filename, MD5SumToString(c->ident.md5sum));
+				Debug(grf, 1, "NewGRF {:08X} ({}) not found; checksum {}. Compatibility mode on", BSWAP32(c->ident.grfid), c->filename, FormatArrayAsHex(c->ident.md5sum));
 				if (!HasBit(c->flags, GCF_COMPATIBLE)) {
 					/* Preserve original_md5sum after it has been assigned */
 					SetBit(c->flags, GCF_COMPATIBLE);
@@ -494,7 +494,7 @@ GRFListCompatibility IsGoodGRFConfigList(GRFConfig *grfconfig)
 			}
 
 			/* No compatible grf was found, mark it as disabled */
-			Debug(grf, 0, "NewGRF {:08X} ({}) not found; checksum {}", BSWAP32(c->ident.grfid), c->filename, MD5SumToString(c->ident.md5sum));
+			Debug(grf, 0, "NewGRF {:08X} ({}) not found; checksum {}", BSWAP32(c->ident.grfid), c->filename, FormatArrayAsHex(c->ident.md5sum));
 
 			c->status = GCS_NOT_FOUND;
 			res = GLC_NOT_FOUND;
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
index 438413f6a5..da26d62f36 100644
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -105,7 +105,7 @@ static void ShowNewGRFInfo(const GRFConfig *c, const Rect &r, bool show_params)
 	}
 
 	/* Prepare and draw MD5 sum */
-	tmp = MD5SumToString(c->ident.md5sum);
+	tmp = FormatArrayAsHex(c->ident.md5sum);
 	SetDParamStr(0, tmp);
 	tr.top = DrawStringMultiLine(tr, STR_NEWGRF_SETTINGS_MD5SUM);
 
diff --git a/src/openttd.cpp b/src/openttd.cpp
index 168d82bcb9..6444d410b9 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -258,7 +258,7 @@ static void WriteSavegameInfo(const char *name)
 	if (_load_check_data.HasNewGrfs()) {
 		for (GRFConfig *c = _load_check_data.grfconfig; c != nullptr; c = c->next) {
 			fmt::format_to(std::back_inserter(message), "{:08X} {} {}\n", c->ident.grfid,
-				MD5SumToString(HasBit(c->flags, GCF_COMPATIBLE) ? c->original_md5sum : c->ident.md5sum), c->filename);
+				FormatArrayAsHex(HasBit(c->flags, GCF_COMPATIBLE) ? c->original_md5sum : c->ident.md5sum), c->filename);
 		}
 	}
 
diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
index 15213ca7d0..7cdd8dbb0b 100644
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -389,11 +389,11 @@ static void CDECL HandleSavegameLoadCrash(int signum)
 			if (HasBit(c->flags, GCF_COMPATIBLE)) {
 				const GRFIdentifier *replaced = _gamelog.GetOverriddenIdentifier(c);
 				fmt::format_to(std::back_inserter(message), "NewGRF {:08X} (checksum {}) not found.\n  Loaded NewGRF \"{}\" (checksum {}) with same GRF ID instead.\n",
-						BSWAP32(c->ident.grfid), MD5SumToString(c->original_md5sum), c->filename, MD5SumToString(replaced->md5sum));
+						BSWAP32(c->ident.grfid), FormatArrayAsHex(c->original_md5sum), c->filename, FormatArrayAsHex(replaced->md5sum));
 			}
 			if (c->status == GCS_NOT_FOUND) {
 				fmt::format_to(std::back_inserter(message), "NewGRF {:08X} ({}) not found; checksum {}.\n",
-						BSWAP32(c->ident.grfid), c->filename, MD5SumToString(c->ident.md5sum));
+						BSWAP32(c->ident.grfid), c->filename, FormatArrayAsHex(c->ident.md5sum));
 			}
 		}
 	} else {
diff --git a/src/screenshot.cpp b/src/screenshot.cpp
index 2f3a8257cb..8d853c52dc 100644
--- a/src/screenshot.cpp
+++ b/src/screenshot.cpp
@@ -320,7 +320,7 @@ static bool MakePNGImage(const char *name, ScreenshotCallback *callb, void *user
 	fmt::format_to(std::back_inserter(message), "Graphics set: {} ({})\n", BaseGraphics::GetUsedSet()->name, BaseGraphics::GetUsedSet()->version);
 	message += "NewGRFs:\n";
 	for (const GRFConfig *c = _game_mode == GM_MENU ? nullptr : _grfconfig; c != nullptr; c = c->next) {
-		fmt::format_to(std::back_inserter(message), "{:08X} {} {}\n", BSWAP32(c->ident.grfid), MD5SumToString(c->ident.md5sum), c->filename);
+		fmt::format_to(std::back_inserter(message), "{:08X} {} {}\n", BSWAP32(c->ident.grfid), FormatArrayAsHex(c->ident.md5sum), c->filename);
 	}
 	message += "\nCompanies:\n";
 	for (const Company *c : Company::Iterate()) {
diff --git a/src/settings.cpp b/src/settings.cpp
index b280a5204e..7843714889 100644
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -1140,7 +1140,7 @@ static void GRFSaveConfig(IniFile &ini, const char *grpname, const GRFConfig *li
 		GRFBuildParamList(params, c, lastof(params));
 
 		std::string key = fmt::format("{:08X}|{}|{}", BSWAP32(c->ident.grfid),
-				MD5SumToString(c->ident.md5sum), c->filename);
+				FormatArrayAsHex(c->ident.md5sum), c->filename);
 		group->GetItem(key, true)->SetValue(params);
 	}
 }
diff --git a/src/string.cpp b/src/string.cpp
index 2f8174eb4e..f55ebfbe24 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -613,17 +613,6 @@ int CDECL seprintf(char *str, const char *last, const char *format, ...)
 }
 
 
-/**
- * Convert the md5sum to a hexadecimal string representation
- * @param md5sum the md5sum itself
- * @return the string representation of the md5sum.
- */
-std::string MD5SumToString(const MD5Hash &md5sum)
-{
-	return FormatArrayAsHex(md5sum);
-}
-
-
 /* UTF-8 handling routines */
 
 
diff --git a/src/string_func.h b/src/string_func.h
index dd6a10341a..914cd064c3 100644
--- a/src/string_func.h
+++ b/src/string_func.h
@@ -29,7 +29,6 @@
 #include "core/bitmath_func.hpp"
 #include "core/span_type.hpp"
 #include "string_type.h"
-#include "3rdparty/md5/md5.h"
 
 char *strecat(char *dst, const char *src, const char *last) NOACCESS(3);
 char *strecpy(char *dst, const char *src, const char *last) NOACCESS(3);
@@ -91,8 +90,6 @@ static inline size_t ttd_strnlen(const char *str, size_t maxlen)
 	return t - str;
 }
 
-std::string MD5SumToString(const MD5Hash &md5sum);
-
 bool IsValidChar(WChar key, CharSetFilter afilter);
 
 size_t Utf8Decode(WChar *c, const char *s);