diff --git a/base64/Makefile b/base64/Makefile
new file mode 100644
index 0000000..2ba852e
--- /dev/null
+++ b/base64/Makefile
@@ -0,0 +1,7 @@
+build:
+	go test -c -o base64-bench.exec
+
+bench:
+	time ./base64-bench.exec -test.v -test.benchmem -test.bench ^Benchmark -test.count 5 -test.run ^$ > bench.txt
+
+run: build bench
diff --git a/base64/README.md b/base64/README.md
new file mode 100644
index 0000000..cfc5d5e
--- /dev/null
+++ b/base64/README.md
@@ -0,0 +1,35 @@
+# base64
+
+## Who
+
+```
+github.com/cristalhq/base64 v0.1.2
+github.com/segmentio/asm v1.1.4
+```
+
+## Where
+
+```
+MacBook Pro (16-inch, 2019)
+2,6 GHz 6-Core Intel Core i7
+16 GB 2667 MHz DDR4
+```
+
+## How
+
+```shell script
+# build & run benchmark
+$ make run
+
+# or in steps
+
+# build test executable
+$ go test -c -o base64-bench.exec
+
+# run executable
+$ time ./base64-bench.exec -v -benchmem -bench ^Benchmark -count 5 -run ^$ > bench.txt
+```
+
+## Results
+
+See [bench.txt](https://github.com/cristalhq/benchmarks/blob/main/base64/bench.txt)
diff --git a/base64/bench.txt b/base64/bench.txt
new file mode 100644
index 0000000..ec137f5
--- /dev/null
+++ b/base64/bench.txt
@@ -0,0 +1,22 @@
+goos: darwin
+goarch: arm64
+pkg: github.com/cristaloleg/benches/base64
+Benchmark_cristalhq
+Benchmark_cristalhq-10    	  586058	      2063 ns/op	3970.22 MB/s	   12288 B/op	       1 allocs/op
+Benchmark_cristalhq-10    	  591297	      2212 ns/op	3703.11 MB/s	   12288 B/op	       1 allocs/op
+Benchmark_cristalhq-10    	  534670	      2254 ns/op	3633.67 MB/s	   12288 B/op	       1 allocs/op
+Benchmark_cristalhq-10    	  544071	      2248 ns/op	3644.62 MB/s	   12288 B/op	       1 allocs/op
+Benchmark_cristalhq-10    	  534746	      2093 ns/op	3913.14 MB/s	   12288 B/op	       1 allocs/op
+Benchmark_golang
+Benchmark_golang-10       	  203595	      5799 ns/op	1412.60 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_golang-10       	  206269	      5834 ns/op	1404.17 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_golang-10       	  205230	      5795 ns/op	1413.72 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_golang-10       	  207208	      5828 ns/op	1405.53 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_golang-10       	  204903	      5803 ns/op	1411.58 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_segmentio
+Benchmark_segmentio-10    	  590043	      1958 ns/op	4184.40 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_segmentio-10    	  617035	      1956 ns/op	4187.37 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_segmentio-10    	  610040	      1945 ns/op	4211.46 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_segmentio-10    	  607477	      1950 ns/op	4201.10 MB/s	   24576 B/op	       2 allocs/op
+Benchmark_segmentio-10    	  618952	      1972 ns/op	4153.74 MB/s	   24576 B/op	       2 allocs/op
+PASS
diff --git a/base64/bench_test.go b/base64/bench_test.go
new file mode 100644
index 0000000..69c8a69
--- /dev/null
+++ b/base64/bench_test.go
@@ -0,0 +1,69 @@
+package base64_test
+
+import (
+	"math/rand"
+	"testing"
+
+	golang "encoding/base64"
+
+	cristalhq "github.com/cristalhq/base64"
+	segmentio "github.com/segmentio/asm/base64"
+)
+
+func Benchmark_cristalhq(b *testing.B) {
+	data := make([]byte, 8192)
+	b.SetBytes(int64(len(data)))
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	var v int64
+	for i := 0; i < b.N; i++ {
+		res := cristalhq.StdEncoding.EncodeToString(data)
+		v += int64(len(res))
+	}
+
+	sinkValue(v)
+}
+
+func Benchmark_golang(b *testing.B) {
+	data := make([]byte, 8192)
+	b.SetBytes(int64(len(data)))
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	var v int64
+	for i := 0; i < b.N; i++ {
+		res := golang.StdEncoding.EncodeToString(data)
+		v += int64(len(res))
+	}
+
+	sinkValue(v)
+}
+
+func Benchmark_segmentio(b *testing.B) {
+	data := make([]byte, 8192)
+	b.SetBytes(int64(len(data)))
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	var v int64
+
+	for i := 0; i < b.N; i++ {
+		res := segmentio.StdEncoding.EncodeToString(data)
+		v += int64(len(res))
+	}
+
+	sinkValue(v)
+}
+
+func checkErr(tb testing.TB, err error) {
+	if err != nil {
+		tb.Fatal(err)
+	}
+}
+
+func sinkValue(v int64) {
+	if rand.Float64() > 2 {
+		panic(v)
+	}
+}
diff --git a/base64/go.mod b/base64/go.mod
new file mode 100644
index 0000000..464705c
--- /dev/null
+++ b/base64/go.mod
@@ -0,0 +1,10 @@
+module github.com/cristaloleg/benches/base64
+
+go 1.17
+
+require (
+	github.com/cristalhq/base64 v0.1.2
+	github.com/segmentio/asm v1.1.4
+)
+
+require golang.org/x/sys v0.0.0-20211110154304-99a53858aa08 // indirect
diff --git a/base64/go.sum b/base64/go.sum
new file mode 100644
index 0000000..dfe6bfe
--- /dev/null
+++ b/base64/go.sum
@@ -0,0 +1,6 @@
+github.com/cristalhq/base64 v0.1.2 h1:edsefYyYDiac7Ytdh2xdaiiSSJzcI2f0yIkdGEf1qY0=
+github.com/cristalhq/base64 v0.1.2/go.mod h1:sy4+2Hale2KbtSqkzpdMeYTP/IrB+HCvxVHWsh2VSYk=
+github.com/segmentio/asm v1.1.4 h1:Q/FKBtrgnmDc0YMrurLROqG9mXE6Ndn276EtDnoWtMM=
+github.com/segmentio/asm v1.1.4/go.mod h1:Ld3L4ZXGNcSLRg4JBsZ3//1+f/TjYl0Mzen/DQy1EJg=
+golang.org/x/sys v0.0.0-20211110154304-99a53858aa08 h1:WecRHqgE09JBkh/584XIE6PMz5KKE/vER4izNUi30AQ=
+golang.org/x/sys v0.0.0-20211110154304-99a53858aa08/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=