diff --git a/README.md b/README.md
index 749fd17..0acfac2 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,11 @@ for translation or other purposes. The available modes are:
 Suppress text hook on specified scenario pages. _list_ is a comma-separated list
 of page numbers.
 
+#### `-censor` _file_
+Enables **Streamer Mode**, which mosaics specific images to make them safe for
+streaming. The _file_ is a text file containing a list of image numbers
+to censor, one per line. Lines starting with '#' are treated as comments.
+
 #### `-trace`
 Enables trace mode, which prints debug information to the console.
 
diff --git a/src/config.cpp b/src/config.cpp
index 5a2440a..6be2a5a 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -140,6 +140,8 @@ Config::Config(int argc, char *argv[])
 			font_file = argv[++i];
 		else if (strcmp(argv[i], "-playlist") == 0)
 			playlist = argv[++i];
+		else if (strcmp(argv[i], "-censor") == 0)
+			censor_list = argv[++i];
 		else if (strcmp(argv[i], "-fm") == 0)
 			use_fm = true;
 		else if (strcmp(argv[i], "-mididevice") == 0)
@@ -208,6 +210,8 @@ void Config::load_ini()
 				font_file = normalize_path(val);
 			else if (!strcasecmp(key, "playlist"))
 				playlist = normalize_path(val);
+			else if (!strcasecmp(key, "censor"))
+				censor_list = normalize_path(val);
 			else if (!strcasecmp(key, "fm"))
 				use_fm = to_bool(val, lineno);
 			else if (!strcasecmp(key, "mididevice"))
diff --git a/src/config.h b/src/config.h
index b1f830b..0947742 100644
--- a/src/config.h
+++ b/src/config.h
@@ -39,6 +39,7 @@ struct Config {
 	std::string encoding;
 	std::string save_dir;
 	std::string playlist;
+	std::string censor_list;
 	std::string title;
 	int midi_device = -1;
 	bool print_version = false;
diff --git a/src/sys/ags.cpp b/src/sys/ags.cpp
index 58c123d..d8ca35b 100644
--- a/src/sys/ags.cpp
+++ b/src/sys/ags.cpp
@@ -5,6 +5,7 @@
 */
 
 #include "ags.h"
+#include <ctype.h>
 #include <string.h>
 #include "nact.h"
 #include "game_id.h"
@@ -64,6 +65,9 @@ AGS::AGS(const Config& config, const GameId& game_id) : game_id(game_id)
 	SDL_SetSurfacePalette(hBmpScreen[1], screen_palette);
 	SDL_SetSurfacePalette(hBmpScreen[2], screen_palette);
 
+	if (!config.censor_list.empty())
+		load_censor_list(config.censor_list.c_str());
+
 	// フォント
 	TTF_Init();
 	if (!config.font_file.empty()) {
@@ -483,6 +487,43 @@ int AGS::calculate_menu_max(int window) {
 	return 11;
 }
 
+void AGS::load_censor_list(const char* fname)
+{
+	censor_list.clear();
+	if (!fname || !*fname)
+		return;
+
+	FILE *fp = fopen(fname, "r");
+	if (!fp) {
+		ERROR("failed to open %s", fname);
+		return;
+	}
+
+	char line[256];
+	int line_no = 0;
+	while (fgets(line, sizeof(line), fp)) {
+		line_no++;
+		char* p = line;
+		char* comment = strchr(p, '#');
+		if (comment)
+			*comment = '\0';
+		while (*p && isspace((unsigned char)*p))
+			p++;
+		if (*p == '\0')
+			continue;
+
+		char *endptr;
+		censor_list.insert(strtol(p, &endptr, 10));
+
+		while (*endptr && isspace((unsigned char)*endptr))
+			endptr++;
+		if (*endptr != '\0')
+			WARNING("%s:%d: syntax error", fname, line_no);
+	}
+
+	fclose(fp);
+}
+
 #ifdef __EMSCRIPTEN__
 extern "C" {
 
@@ -490,5 +531,9 @@ bool EMSCRIPTEN_KEEPALIVE save_screenshot(const char* path) {
 	return g_nact->ags->save_screenshot(path);
 }
 
+void EMSCRIPTEN_KEEPALIVE load_censor_list(const char *path) {
+	return g_nact->ags->load_censor_list(path);
+}
+
 }
 #endif
diff --git a/src/sys/ags.h b/src/sys/ags.h
index e98cecc..8c93b47 100644
--- a/src/sys/ags.h
+++ b/src/sys/ags.h
@@ -103,6 +103,8 @@ public:
 	void load_cg(int page, int transparent);
 	void set_cg_file(const char *file_name);
 
+	void load_censor_list(const char* fname);
+
 	void set_palette(int index, uint8_t r, uint8_t g, uint8_t b);
 	std::vector<uint32_t> get_screen_palette() const;
 	uint8 get_pixel(int dest, int x, int y) const { return vram[dest][y][x]; }
@@ -203,6 +205,7 @@ public:
 	bool get_palette;
 	bool extract_palette;
 	bool extract_cg;
+	std::unordered_set<int> censor_list;
 	std::unordered_set<int> ignore_palette;
 	int palette_bank;
 
diff --git a/src/sys/ags_draw.cpp b/src/sys/ags_draw.cpp
index 2d025c3..d3cc560 100644
--- a/src/sys/ags_draw.cpp
+++ b/src/sys/ags_draw.cpp
@@ -14,6 +14,23 @@
 #include "game_id.h"
 #include "debugger/debugger.h"
 
+namespace {
+
+const int MOSAIC_SIZE = 16;
+
+void mosaic(SDL_Surface* sf) {
+	SDL_Surface *tmp = SDL_CreateRGBSurfaceWithFormat(
+		0, (sf->w + MOSAIC_SIZE - 1) / MOSAIC_SIZE, (sf->h + MOSAIC_SIZE - 1) / MOSAIC_SIZE, 8, SDL_PIXELFORMAT_INDEX8);
+	if (sf->format->palette)
+		SDL_SetSurfacePalette(tmp, sf->format->palette);
+	// NOTE: SDL_BlitScaled() does not support 8-bit surfaces.
+	SDL_SoftStretch(sf, NULL, tmp, NULL);
+	SDL_SoftStretch(tmp, NULL, sf, NULL);
+	SDL_FreeSurface(tmp);
+}
+
+}  // namespace
+
 void AGS::load_cg(int page, int transparent)
 {
 	if (bmp_prefix) {
@@ -78,6 +95,9 @@ void AGS::load_cg(int page, int transparent)
 	}
 	if (extract_cg && cg.surface()) {
 		SDL_SetSurfacePalette(cg.surface(), screen_palette);
+		if (censor_list.count(page)) {
+			mosaic(cg.surface());
+		}
 		SDL_Rect dstrect = { cg.x, cg.y, cg.surface()->w, cg.surface()->h };
 		SDL_BlitSurface(cg.surface(), NULL, hBmpScreen[dest_screen], &dstrect);
 		if (dest_screen == 0) {
diff --git a/system3.ini.example b/system3.ini.example
index 2317b94..531f753 100644
--- a/system3.ini.example
+++ b/system3.ini.example
@@ -46,6 +46,12 @@ texthook = none
 ; The example below is for Rance 4.1, to filter out system messages.
 ;texthook_suppress = 2,7
 
+; Censor list for Streamer Mode.
+; This mosaics images listed in the specified file, making them safe for
+; streaming or public viewing. The file should contain one image number
+; per line, with '#' treated as comments.
+;censor = censor_list.txt
+
 ; Enables trace mode, which prints debug information to the console.
 ;trace = true