diff --git a/src/libsigrok-internal.h b/src/libsigrok-internal.h
index 317cad4a..a567d14b 100644
--- a/src/libsigrok-internal.h
+++ b/src/libsigrok-internal.h
@@ -1026,6 +1026,9 @@ SR_PRIV int sr_atof(const char *str, float *ret);
 SR_PRIV int sr_atod_ascii(const char *str, double *ret);
 SR_PRIV int sr_atof_ascii(const char *str, float *ret);
 
+SR_PRIV GString *sr_hexdump_new(const uint8_t *data, const size_t len);
+SR_PRIV void sr_hexdump_free(GString *s);
+
 /*--- soft-trigger.c --------------------------------------------------------*/
 
 struct soft_trigger_logic {
diff --git a/src/strutil.c b/src/strutil.c
index 73c9fc6a..93e424ee 100644
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -590,6 +590,42 @@ SR_API int sr_vsnprintf_ascii(char *buf, size_t buf_size,
 #endif
 }
 
+/**
+ * Convert a sequence of bytes to its textual representation ("hex dump").
+ *
+ * Callers should free the allocated GString. See @ref sr_hexdump_free().
+ *
+ * @param[in] data Pointer to the byte sequence to print.
+ * @param[in] len Number of bytes to print.
+ *
+ * @return #NULL upon error, newly allocated GString pointer otherwise.
+ */
+SR_PRIV GString *sr_hexdump_new(const uint8_t *data, const size_t len)
+{
+	GString *s;
+	size_t i;
+
+	s = g_string_sized_new(3 * len);
+	for (i = 0; i < len; i++) {
+		if (i)
+			g_string_append_c(s, ' ');
+		g_string_append_printf(s, "%02x", data[i]);
+	}
+
+	return s;
+}
+
+/**
+ * Free a hex dump text that was created by @ref sr_hexdump_new().
+ *
+ * @param[in] s Pointer to the GString to release.
+ */
+SR_PRIV void sr_hexdump_free(GString *s)
+{
+	if (s)
+		g_string_free(s, TRUE);
+}
+
 /**
  * Convert a string representation of a numeric value to a sr_rational.
  *