diff --git a/dulcepan.cfg b/dulcepan.cfg
index 682c5b0..7afa8e0 100644
--- a/dulcepan.cfg
+++ b/dulcepan.cfg
@@ -11,3 +11,6 @@ border-size = 2
 # If true, dulcepan will save immediately when interactive selection is stopped
 # or when a whole output is selected with a mouse button.
 quick-select = false
+
+# PNG (zlib) compression level, 0-9
+png-compression = 6
diff --git a/src/config.c b/src/config.c
index 8116677..0470f4d 100644
--- a/src/config.c
+++ b/src/config.c
@@ -76,6 +76,7 @@ void dp_config_load(struct dp_config *config, const char *user_path) {
 
 	*config = (struct dp_config){
 		.border_size = 2,
+		.png_compression = 6,
 		.quick_select = false,
 	};
 	bytes_to_color((uint32_t[]){0xff, 0xff, 0xff, 0x40}, &config->unselected_color);
@@ -168,6 +169,12 @@ void dp_config_load(struct dp_config *config, const char *user_path) {
 			load_color(value, line_idx, &config->border_color);
 		} else if (strcmp(key, "border-size") == 0) {
 			load_int(value, line_idx, &config->border_size);
+		} else if (strcmp(key, "png-compression") == 0) {
+			load_int(value, line_idx, &config->png_compression);
+			if (config->png_compression > 9) {
+				dp_log_fatal(
+						"Config: invalid value %d for png-compression", config->png_compression);
+			}
 		} else if (strcmp(key, "quick-select") == 0) {
 			load_bool(value, line_idx, &config->quick_select);
 		} else {
diff --git a/src/dulcepan.h b/src/dulcepan.h
index 78ca80e..532c4e4 100644
--- a/src/dulcepan.h
+++ b/src/dulcepan.h
@@ -105,6 +105,7 @@ struct dp_config {
 	pixman_color_t selected_color;
 	pixman_color_t border_color;
 	int border_size; // 0 if disabled
+	int png_compression;
 	bool quick_select;
 };
 
diff --git a/src/save.c b/src/save.c
index 1563639..81fb7ec 100644
--- a/src/save.c
+++ b/src/save.c
@@ -61,7 +61,7 @@ static pixman_format_code_t shm_to_pixman(enum wl_shm_format shm_format) {
 	return 0; // Unreachable, actually
 }
 
-static void write_png(FILE *fp, pixman_image_t *image, int width, int height) {
+static void write_png(FILE *fp, pixman_image_t *image, int width, int height, int level) {
 	void *data = pixman_image_get_data(image);
 	size_t size = (size_t)(width * height * 4);
 
@@ -75,6 +75,7 @@ static void write_png(FILE *fp, pixman_image_t *image, int width, int height) {
 
 	spng_set_ihdr(spng_ctx, &ihdr);
 	spng_set_png_file(spng_ctx, fp);
+	spng_set_option(spng_ctx, SPNG_IMG_COMPRESSION_LEVEL, level);
 
 	int err = spng_encode_image(spng_ctx, data, size, SPNG_FMT_PNG, SPNG_ENCODE_FINALIZE);
 	if (err != 0) {
@@ -158,7 +159,8 @@ void dp_save(struct dp_state *state) {
 	case DP_FILE_UNKNOWN:
 		abort(); // Unreachable
 	case DP_FILE_PNG:
-		write_png(fp, out_image, selection->width, selection->height);
+		write_png(
+				fp, out_image, selection->width, selection->height, state->config.png_compression);
 		break;
 	case DP_FILE_PPM:
 		write_ppm(fp, out_image, selection->width, selection->height);