diff --git a/src/samplers/string.js b/src/samplers/string.js
index ef30dba..e6f7182 100644
--- a/src/samplers/string.js
+++ b/src/samplers/string.js
@@ -104,6 +104,10 @@ function regexSample() {
   return '/regex/';
 }
 
+function binarySample() {
+  return [116, 101, 115, 116];
+}
+
 const stringFormats = {
   'email': emailSample,
   'idn-email': idnEmailSample, // https://tools.ietf.org/html/rfc6531#section-3.3
@@ -125,6 +129,7 @@ const stringFormats = {
   'json-pointer': jsonPointerSample,
   'relative-json-pointer': relativeJsonPointerSample, // https://tools.ietf.org/html/draft-handrews-relative-json-pointer-01
   'regex': regexSample,
+  'binary': binarySample,
 };
 
 export function sampleString(schema, options, spec, context) {
diff --git a/test/unit/string.spec.js b/test/unit/string.spec.js
index 46686b3..96b7471 100644
--- a/test/unit/string.spec.js
+++ b/test/unit/string.spec.js
@@ -135,6 +135,11 @@ describe('sampleString', () => {
       });
   });
 
+  it('should return binary for format binary', () => {
+    res = sampleString({format: 'binary'});
+    expect(res).toEqual([116, 101, 115, 116]);
+  });
+  
   it.each([
     'email',
     // 'idn-email', // unsupported by ajv-formats