diff --git a/src/execplugin/execplugin.c b/src/execplugin/execplugin.c
index 0d2c447..6e1f9b9 100644
--- a/src/execplugin/execplugin.c
+++ b/src/execplugin/execplugin.c
@@ -882,22 +882,22 @@ gboolean read_execp(void *obj)
     return FALSE;
 }
 
-const char *time_to_string(int seconds, char *buffer)
+const char *time_to_string(int seconds, char *buffer, size_t buffer_size)
 {
     if (seconds < 60) {
-        sprintf(buffer, "%ds", seconds);
+        snprintf(buffer, buffer_size, "%ds", seconds);
     } else if (seconds < 60 * 60) {
         int m = seconds / 60;
         seconds = seconds % 60;
         int s = seconds;
-        sprintf(buffer, "%d:%ds", m, s);
+        snprintf(buffer, buffer_size, "%d:%ds", m, s);
     } else {
         int h = seconds / (60 * 60);
         seconds = seconds % (60 * 60);
         int m = seconds / 60;
         seconds = seconds % 60;
         int s = seconds;
-        sprintf(buffer, "%d:%d:%ds", h, m, s);
+        snprintf(buffer, buffer_size, "%d:%d:%ds", h, m, s);
     }
     return buffer;
 }
@@ -923,35 +923,39 @@ char *execp_get_tooltip(void *obj)
         if (execp->backend->last_update_finish_time) {
             // We updated at least once
             if (execp->backend->interval > 0) {
-                sprintf(execp->backend->tooltip_text,
-                        "Last update finished %s ago (took %s). Next update starting in %s.",
-                        time_to_string((int)(now - execp->backend->last_update_finish_time), tmp_buf1),
-                        time_to_string((int)execp->backend->last_update_duration, tmp_buf2),
-                        time_to_string((int)(execp->backend->interval - (now - execp->backend->last_update_finish_time)),
-                                       tmp_buf3));
+                snprintf(execp->backend->tooltip_text,
+                         sizeof(execp->backend->tooltip_text),
+                         "Last update finished %s ago (took %s). Next update starting in %s.",
+                         time_to_string((int)(now - execp->backend->last_update_finish_time), tmp_buf1, sizeof(tmp_buf1)),
+                         time_to_string((int)execp->backend->last_update_duration, tmp_buf2, sizeof(tmp_buf2)),
+                         time_to_string((int)(execp->backend->interval - (now - execp->backend->last_update_finish_time)),
+                                        tmp_buf3, sizeof(tmp_buf3)));
             } else {
-                sprintf(execp->backend->tooltip_text,
-                        "Last update finished %s ago (took %s).",
-                        time_to_string((int)(now - execp->backend->last_update_finish_time), tmp_buf1),
-                        time_to_string((int)execp->backend->last_update_duration, tmp_buf2));
+                snprintf(execp->backend->tooltip_text,
+                         sizeof(execp->backend->tooltip_text),
+                         "Last update finished %s ago (took %s).",
+                         time_to_string((int)(now - execp->backend->last_update_finish_time), tmp_buf1, sizeof(tmp_buf1)),
+                         time_to_string((int)execp->backend->last_update_duration, tmp_buf2, sizeof(tmp_buf2)));
             }
         } else {
             // we never requested an update
-            sprintf(execp->backend->tooltip_text, "Never updated. No update scheduled.");
+            snprintf(execp->backend->tooltip_text, sizeof(execp->backend->tooltip_text), "Never updated. No update scheduled.");
         }
     } else {
         // Currently executing command
         if (execp->backend->last_update_finish_time) {
             // we finished updating at least once
-            sprintf(execp->backend->tooltip_text,
-                    "Last update finished %s ago. Update in progress (started %s ago).",
-                    time_to_string((int)(now - execp->backend->last_update_finish_time), tmp_buf1),
-                    time_to_string((int)(now - execp->backend->last_update_start_time), tmp_buf3));
+            snprintf(execp->backend->tooltip_text,
+                     sizeof(execp->backend->tooltip_text),
+                     "Last update finished %s ago. Update in progress (started %s ago).",
+                     time_to_string((int)(now - execp->backend->last_update_finish_time), tmp_buf1, sizeof(tmp_buf1)),
+                     time_to_string((int)(now - execp->backend->last_update_start_time), tmp_buf3, sizeof(tmp_buf3)));
         } else {
             // we never finished an update
-            sprintf(execp->backend->tooltip_text,
-                    "First update in progress (started %s seconds ago).",
-                    time_to_string((int)(now - execp->backend->last_update_start_time), tmp_buf1));
+            snprintf(execp->backend->tooltip_text,
+                     sizeof(execp->backend->tooltip_text),
+                     "First update in progress (started %s seconds ago).",
+                     time_to_string((int)(now - execp->backend->last_update_start_time), tmp_buf1, sizeof(tmp_buf1)));
         }
     }
     return strdup(execp->backend->tooltip_text);
diff --git a/src/launcher/apps-common.c b/src/launcher/apps-common.c
index 7acfc31..3508eac 100644
--- a/src/launcher/apps-common.c
+++ b/src/launcher/apps-common.c
@@ -60,9 +60,9 @@ void expand_exec(DesktopEntry *entry, const char *path)
     // %c -> Name
     // %k -> path
     if (entry->exec) {
-        char *exec2 = calloc(strlen(entry->exec) + (entry->name ? strlen(entry->name) : 1) +
-                                 (entry->icon ? strlen(entry->icon) : 1) + 100,
-                             1);
+        size_t buf_size = strlen(entry->exec) + (entry->name ? strlen(entry->name) : 1) +
+                (entry->icon ? strlen(entry->icon) : 1) + 100;
+        char *exec2 = calloc(buf_size, 1);
         char *p, *q;
         // p will never point to an escaped char
         for (p = entry->exec, q = exec2; *p; p++, q++) {
@@ -82,23 +82,30 @@ void expand_exec(DesktopEntry *entry, const char *path)
                 if (!*p)
                     break;
                 if (*p == 'i' && entry->icon != NULL) {
-                    sprintf(q, "--icon '%s'", entry->icon);
+                    snprintf(q, buf_size, "--icon '%s'", entry->icon);
+                    char *old = q;
                     q += strlen("--icon ''");
                     q += strlen(entry->icon);
+                    buf_size -= (size_t)(q - old);
                     q--; // To balance the q++ in the for
                 } else if (*p == 'c' && entry->name != NULL) {
-                    sprintf(q, "'%s'", entry->name);
+                    snprintf(q, buf_size, "'%s'", entry->name);
+                    char *old = q;
                     q += strlen("''");
                     q += strlen(entry->name);
+                    buf_size -= (size_t)(q - old);
                     q--; // To balance the q++ in the for
                 } else if (*p == 'c') {
-                    sprintf(q, "'%s'", path);
+                    snprintf(q, buf_size, "'%s'", path);
+                    char *old = q;
                     q += strlen("''");
                     q += strlen(path);
+                    buf_size -= (size_t)(q - old);
                     q--; // To balance the q++ in the for
                 } else if (*p == 'f' || *p == 'F') {
-                    sprintf(q, "%c%c", '%', *p);
+                    snprintf(q, buf_size, "%c%c", '%', *p);
                     q += 2;
+                    buf_size -= 2;
                     q--; // To balance the q++ in the for
                 } else {
                     // We don't care about other expansions
diff --git a/src/launcher/icon-theme-common.c b/src/launcher/icon-theme-common.c
index a43058c..acd184a 100644
--- a/src/launcher/icon-theme-common.c
+++ b/src/launcher/icon-theme-common.c
@@ -621,7 +621,7 @@ char *get_icon_path_helper(GSList *themes, const char *icon_name, int size)
                     }
                     file_name[0] = 0;
                     // filename = directory/$(themename)/subdirectory/iconname.extension
-                    sprintf(file_name, "%s/%s/%s/%s%s", base_name, theme_name, dir_name, icon_name, extension);
+                    snprintf(file_name, (size_t)file_name_size, "%s/%s/%s/%s%s", base_name, theme_name, dir_name, icon_name, extension);
                     if (debug_icons)
                         fprintf(stderr, "tint2: Checking %s\n", file_name);
                     if (g_file_test(file_name, G_FILE_TEST_EXISTS)) {
@@ -679,9 +679,10 @@ char *get_icon_path_helper(GSList *themes, const char *icon_name, int size)
             for (GSList *ext = extensions; ext; ext = g_slist_next(ext)) {
                 char *base_name = (char *)base->data;
                 char *extension = (char *)ext->data;
-                file_name = calloc(strlen(base_name) + strlen(icon_name) + strlen(extension) + 100, 1);
+                size_t file_name_size = strlen(base_name) + strlen(icon_name) + strlen(extension) + 100;
+                file_name = calloc(file_name_size, 1);
                 // filename = directory/iconname.extension
-                sprintf(file_name, "%s/%s%s", base_name, icon_name, extension);
+                snprintf(file_name, file_name_size, "%s/%s%s", base_name, icon_name, extension);
                 if (debug_icons)
                     fprintf(stderr, "tint2: Checking %s\n", file_name);
                 if (g_file_test(file_name, G_FILE_TEST_EXISTS)) {
diff --git a/src/launcher/launcher.c b/src/launcher/launcher.c
index 8e9ae29..3d8b739 100644
--- a/src/launcher/launcher.c
+++ b/src/launcher/launcher.c
@@ -470,7 +470,7 @@ void launcher_load_icons(Launcher *launcher)
         launcherIcon->area.size_mode = LAYOUT_FIXED;
         launcherIcon->area._resize = NULL;
         launcherIcon->area._compute_desired_size = launcher_icon_compute_desired_size;
-        sprintf(launcherIcon->area.name, "LauncherIcon %d", index);
+        snprintf(launcherIcon->area.name, sizeof(launcherIcon->area.name), "LauncherIcon %d", index);
         launcherIcon->area.resize_needed = 0;
         launcherIcon->area.has_mouse_over_effect = panel_config.mouse_effects;
         launcherIcon->area.has_mouse_press_effect = launcherIcon->area.has_mouse_over_effect;
diff --git a/src/main.c b/src/main.c
index b1feb47..0641266 100644
--- a/src/main.c
+++ b/src/main.c
@@ -723,7 +723,7 @@ void handle_panel_refresh()
     if (debug_frames) {
         for (int i = 0; i < num_panels; i++) {
             char path[256];
-            sprintf(path, "tint2-%d-panel-%d-frame-%d.png", getpid(), i, frame);
+            snprintf(path, sizeof(path), "tint2-%d-panel-%d-frame-%d.png", getpid(), i, frame);
             save_panel_screenshot(&panels[i], path);
         }
     }
diff --git a/src/tint2conf/properties.c b/src/tint2conf/properties.c
index 2c63a11..33a67b7 100644
--- a/src/tint2conf/properties.c
+++ b/src/tint2conf/properties.c
@@ -1312,19 +1312,19 @@ void set_panel_items(const char *items)
         } else if (v == ':') {
             separator_index++;
             buffer[0] = 0;
-            sprintf(buffer, "%s %d", _("Separator"), separator_index + 1);
+            snprintf(buffer, sizeof(buffer), "%s %d", _("Separator"), separator_index + 1);
             name = buffer;
             value = ":";
         } else if (v == 'E') {
             execp_index++;
             buffer[0] = 0;
-            sprintf(buffer, "%s %d", _("Executor"), execp_index + 1);
+            snprintf(buffer, sizeof(buffer), "%s %d", _("Executor"), execp_index + 1);
             name = buffer;
             value = "E";
         } else if (v == 'P') {
             button_index++;
             buffer[0] = 0;
-            sprintf(buffer, "%s %d", _("Button"), button_index + 1);
+            snprintf(buffer, sizeof(buffer), "%s %d", _("Button"), button_index + 1);
             name = buffer;
             value = "P";
         } else {
@@ -4097,7 +4097,7 @@ void create_separator(GtkWidget *notebook, int i)
     Separator *separator = &g_array_index(separators, Separator, i);
 
     separator->name[0] = 0;
-    sprintf(separator->name, "%s %d", _("Separator"), i + 1);
+    snprintf(separator->name, sizeof(separator->name), "%s %d", _("Separator"), i + 1);
     separator->page_label = gtk_label_new(separator->name);
     gtk_widget_show(separator->page_label);
     separator->page_separator = gtk_vbox_new(FALSE, DEFAULT_HOR_SPACING);
@@ -4223,7 +4223,7 @@ void create_execp(GtkWidget *notebook, int i)
     Executor *executor = &g_array_index(executors, Executor, i);
 
     executor->name[0] = 0;
-    sprintf(executor->name, "%s %d", _("Executor"), i + 1);
+    snprintf(executor->name, sizeof(executor->name), "%s %d", _("Executor"), i + 1);
     executor->page_label = gtk_label_new(executor->name);
     gtk_widget_show(executor->page_label);
     executor->page_execp = gtk_vbox_new(FALSE, DEFAULT_HOR_SPACING);
@@ -4644,7 +4644,7 @@ void create_button(GtkWidget *notebook, int i)
     Button *button = &g_array_index(buttons, Button, i);
 
     button->name[0] = 0;
-    sprintf(button->name, "%s %d", _("Button"), i + 1);
+    snprintf(button->name, sizeof(button->name), "%s %d", _("Button"), i + 1);
     button->page_label = gtk_label_new(button->name);
     gtk_widget_show(button->page_label);
     button->page_button = gtk_vbox_new(FALSE, DEFAULT_HOR_SPACING);
@@ -5033,7 +5033,7 @@ void separator_update_indices()
 {
     for (int i = 0; i < separators->len; i++) {
         Separator *separator = &g_array_index(separators, Separator, i);
-        sprintf(separator->name, "%s %d", _("Separator"), i + 1);
+        snprintf(separator->name, sizeof(separator->name), "%s %d", _("Separator"), i + 1);
         gtk_label_set_text(GTK_LABEL(separator->page_label), separator->name);
     }
 
@@ -5051,7 +5051,7 @@ void separator_update_indices()
             separator_index++;
             char buffer[256];
             buffer[0] = 0;
-            sprintf(buffer, "%s %d", _("Separator"), separator_index + 1);
+            snprintf(buffer, sizeof(buffer), "%s %d", _("Separator"), separator_index + 1);
 
             gtk_list_store_set(panel_items, &iter, itemsColName, buffer, -1);
         }
@@ -5065,7 +5065,7 @@ void execp_update_indices()
 {
     for (int i = 0; i < executors->len; i++) {
         Executor *executor = &g_array_index(executors, Executor, i);
-        sprintf(executor->name, "%s %d", _("Executor"), i + 1);
+        snprintf(executor->name, sizeof(executor->name), "%s %d", _("Executor"), i + 1);
         gtk_label_set_text(GTK_LABEL(executor->page_label), executor->name);
     }
 
@@ -5083,7 +5083,7 @@ void execp_update_indices()
             execp_index++;
             char buffer[256];
             buffer[0] = 0;
-            sprintf(buffer, "%s %d", _("Executor"), execp_index + 1);
+            snprintf(buffer, sizeof(buffer), "%s %d", _("Executor"), execp_index + 1);
 
             gtk_list_store_set(panel_items, &iter, itemsColName, buffer, -1);
         }
@@ -5097,7 +5097,7 @@ void button_update_indices()
 {
     for (int i = 0; i < buttons->len; i++) {
         Button *button = &g_array_index(buttons, Button, i);
-        sprintf(button->name, "%s %d", _("Button"), i + 1);
+        snprintf(button->name, sizeof(button->name), "%s %d", _("Button"), i + 1);
         gtk_label_set_text(GTK_LABEL(button->page_label), button->name);
     }
 
@@ -5115,7 +5115,7 @@ void button_update_indices()
             button_index++;
             char buffer[256];
             buffer[0] = 0;
-            sprintf(buffer, "%s %d", _("Button"), button_index + 1);
+            snprintf(buffer, sizeof(buffer), "%s %d", _("Button"), button_index + 1);
 
             gtk_list_store_set(panel_items, &iter, itemsColName, buffer, -1);
         }
diff --git a/src/tint2conf/properties_rw.c b/src/tint2conf/properties_rw.c
index 7454e94..7c0b95d 100644
--- a/src/tint2conf/properties_rw.c
+++ b/src/tint2conf/properties_rw.c
@@ -478,7 +478,7 @@ void config_write_task_font_color(FILE *fp, char *name, GtkWidget *task_color)
     GdkColor color;
     gtk_color_button_get_color(GTK_COLOR_BUTTON(task_color), &color);
     char full_name[128];
-    sprintf(full_name, "task%s_font_color", name);
+    snprintf(full_name, sizeof(full_name), "task%s_font_color", name);
     config_write_color(fp, full_name, color, gtk_color_button_get_alpha(GTK_COLOR_BUTTON(task_color)) * 100 / 0xffff);
 }
 
@@ -489,7 +489,7 @@ void config_write_task_icon_osb(FILE *fp,
                                 GtkWidget *widget_brightness)
 {
     char full_name[128];
-    sprintf(full_name, "task%s_icon_asb", name);
+    snprintf(full_name, sizeof(full_name), "task%s_icon_asb", name);
     fprintf(fp,
             "%s = %d %d %d\n",
             full_name,
@@ -501,7 +501,7 @@ void config_write_task_icon_osb(FILE *fp,
 void config_write_task_background(FILE *fp, char *name, GtkWidget *task_background)
 {
     char full_name[128];
-    sprintf(full_name, "task%s_background_id", name);
+    snprintf(full_name, sizeof(full_name), "task%s_background_id", name);
     fprintf(fp, "%s = %d\n", full_name, gtk_combo_box_get_active(GTK_COMBO_BOX(task_background)));
 }
 
diff --git a/src/util/common.c b/src/util/common.c
index 80bcf13..614f0d7 100644
--- a/src/util/common.c
+++ b/src/util/common.c
@@ -191,7 +191,7 @@ const char *signal_name(int sig)
         return "SIGSYS: Bad system call.";
     }
     static char s[64];
-    sprintf(s, "SIG=%d: Unknown", sig);
+    snprintf(s, sizeof(s), "SIG=%d: Unknown", sig);
     return s;
 }
 
@@ -266,7 +266,7 @@ extern char *config_path;
 int setenvd(const char *name, const int value)
 {
     char buf[256];
-    sprintf(buf, "%d", value);
+    snprintf(buf, sizeof(buf), "%d", value);
     return setenv(name, buf, 1);
 }
 
@@ -793,7 +793,7 @@ Imlib_Image load_image(const char *path, int cached)
     }
     if (!image && g_str_has_suffix(path, ".svg")) {
         char tmp_filename[128];
-        sprintf(tmp_filename, "/tmp/tint2-%d.png", (int)getpid());
+        snprintf(tmp_filename, sizeof(tmp_filename), "/tmp/tint2-%d.png", (int)getpid());
         int fd = open(tmp_filename, O_CREAT | O_EXCL, 0600);
         if (fd >= 0) {
             // We fork here because librsvg allocates memory like crazy
diff --git a/src/util/tracing.c b/src/util/tracing.c
index ecb4d79..aebe49f 100644
--- a/src/util/tracing.c
+++ b/src/util/tracing.c
@@ -49,8 +49,9 @@ char *addr2name(void *func)
     free(strings);
     return result;
 #else
-    char *result = (char*) calloc(32, 1);
-    sprintf(result, "%p", func);
+    const size_t buf_size = 32;
+    char *result = (char*) calloc(buf_size, 1);
+    snprintf(result, buf_size, "%p", func);
     return result;
 #endif
 }