diff --git a/s3/README.md b/s3/README.md
index 95bf6291..4134fcbb 100644
--- a/s3/README.md
+++ b/s3/README.md
@@ -32,7 +32,9 @@ func (s *Storage) Reset() error
 func (s *Storage) Close() error
 func (s *Storage) Conn() *s3.Client
 ```
+
 ### Installation
+
 S3 is tested on the 2 last [Go versions](https://golang.org/dl/) with support for modules. So make sure to initialize one first if you didn't do that yet:
 ```bash
 go mod init github.com/<user>/<repo>
@@ -43,7 +45,9 @@ go get github.com/gofiber/storage/s3/v2
 ```
 
 ### Examples
+
 Import the storage package.
+
 ```go
 import "github.com/gofiber/storage/s3/v2"
 ```
@@ -62,6 +66,25 @@ store := s3.New(s3.Config{
 })
 ```
 
+Create an object with `Set()`:
+```go
+err := store.Set("my-key", []byte("my-value"))
+```
+
+Or, call `SetWithChecksum()` to create an object with checksum to
+ask S3 server to verify data integrity on server side:
+
+> Currently only 4 algorithm are supported: `CRC32`, `CRC32C`, `SHA1`, `SHA256`.
+> For more information, see [PutObjectInput](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#PutObjectInput).
+
+```go
+val := []byte("my-value")
+sha256sum := sha256.New().Sum256(val)
+checksum := map[string][]byte{"SHA256": sha256sum}
+
+err := store.SetWithChecksum("my-key", []byte("my-value"), checksum)
+```
+
 ### Config
 ```go
 // Config defines the config for storage.
diff --git a/s3/s3_methods.go b/s3/s3_methods.go
index 4372b95f..6307ae4a 100644
--- a/s3/s3_methods.go
+++ b/s3/s3_methods.go
@@ -2,6 +2,7 @@ package s3
 
 import (
 	"bytes"
+	"fmt"
 
 	"github.com/aws/aws-sdk-go-v2/aws"
 	"github.com/aws/aws-sdk-go-v2/service/s3"
@@ -10,9 +11,11 @@ import (
 // Additional methods for S3, but not required by gofiber Storage interface.
 
 // SetWithChecksum sets key with value and checksum.
-// Key of `checksum` map is algorithm in upper cases like `CRC32`, `CRC32C`,
-// `SHA1`, `SHA256`, value is the checksum.
-func (s *Storage) SetWithChecksum(key string, val []byte, checksum map[string]string) error {
+// Key of `checksum` map is algorithm in upper cases, value is the checksum.
+// Currently only 4 algorithm are supported: `CRC32`, `CRC32C`, `SHA1`, `SHA256`.
+//
+// For more information, see [PutObjectInput](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/s3#PutObjectInput).
+func (s *Storage) SetWithChecksum(key string, val []byte, checksum map[string][]byte) error {
 	if len(key) <= 0 {
 		return nil
 	}
@@ -29,13 +32,15 @@ func (s *Storage) SetWithChecksum(key string, val []byte, checksum map[string]st
 	for alg, sum := range checksum {
 		switch alg {
 		case "CRC32":
-			poi.ChecksumCRC32 = aws.String(sum)
+			poi.ChecksumCRC32 = aws.String(fmt.Sprintf("%x", sum))
 		case "CRC32C":
-			poi.ChecksumCRC32C = aws.String(sum)
+			poi.ChecksumCRC32C = aws.String(fmt.Sprintf("%x", sum))
 		case "SHA1":
-			poi.ChecksumSHA1 = aws.String(sum)
+			poi.ChecksumSHA1 = aws.String(fmt.Sprintf("%x", sum))
 		case "SHA256":
-			poi.ChecksumSHA256 = aws.String(sum)
+			poi.ChecksumSHA256 = aws.String(fmt.Sprintf("%x", sum))
+		default:
+			return fmt.Errorf("invalid checksum algorithm: %s", alg)
 		}
 	}
 
diff --git a/s3/s3_methods_test.go b/s3/s3_methods_test.go
index 866acea1..0a390225 100644
--- a/s3/s3_methods_test.go
+++ b/s3/s3_methods_test.go
@@ -14,7 +14,7 @@ func Test_S3_SetWithChecksum(t *testing.T) {
 		sha256sum = sha256.New().Sum(val)
 	)
 
-	err := testStore.SetWithChecksum(key, val, map[string]string{"SHA256": string(sha256sum)})
+	err := testStore.SetWithChecksum(key, val, map[string][]byte{"SHA256": sha256sum})
 	require.NoError(t, err)
 
 	result, err := testStore.Get(key)