diff --git a/cmd/ffwebp/main.go b/cmd/ffwebp/main.go
index bb7beae..ab8d10e 100644
--- a/cmd/ffwebp/main.go
+++ b/cmd/ffwebp/main.go
@@ -11,6 +11,7 @@ import (
 	"github.com/coalaura/ffwebp/internal/codec"
 	"github.com/coalaura/ffwebp/internal/logx"
 	"github.com/coalaura/ffwebp/internal/opts"
+	"github.com/nfnt/resize"
 	"github.com/urfave/cli/v3"
 )
 
@@ -46,6 +47,11 @@ func main() {
 			Aliases: []string{"l"},
 			Usage:   "force lossless mode (overrides --quality)",
 		},
+		&cli.UintFlag{
+			Name:    "thumbnail",
+			Aliases: []string{"t"},
+			Usage:   "create a thumbnail no wider/taller than the specified size",
+		},
 		&cli.BoolFlag{
 			Name:    "silent",
 			Aliases: []string{"s"},
@@ -149,6 +155,14 @@ func run(_ context.Context, cmd *cli.Command) error {
 
 	logx.Printf("decoded image: %dx%d %s in %s\n", img.Bounds().Dx(), img.Bounds().Dy(), colorModel(img), time.Since(t0).Truncate(time.Millisecond))
 
+	if thumbnail := cmd.Uint("thumbnail"); thumbnail > 0 {
+		t2 := time.Now()
+
+		img = resize.Thumbnail(thumbnail, thumbnail, img, resize.Lanczos3)
+
+		logx.Printf("resized image: %dx%d in %s\n", img.Bounds().Dx(), img.Bounds().Dy(), time.Since(t2).Truncate(time.Millisecond))
+	}
+
 	t1 := time.Now()
 
 	err = oCodec.Encode(writer, img, common)
diff --git a/go.mod b/go.mod
index fbc8673..597970f 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require github.com/urfave/cli/v3 v3.3.8
 
 require (
 	github.com/gen2brain/webp v0.5.5
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8
 )
 
diff --git a/go.sum b/go.sum
index 1c0b020..d4bf5c5 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/ebitengine/purego v0.8.3 h1:K+0AjQp63JEZTEMZiwsI9g0+hAMNohwUOtY0RPGex
 github.com/ebitengine/purego v0.8.3/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
 github.com/gen2brain/webp v0.5.5 h1:MvQR75yIPU/9nSqYT5h13k4URaJK3gf9tgz/ksRbyEg=
 github.com/gen2brain/webp v0.5.5/go.mod h1:xOSMzp4aROt2KFW++9qcK/RBTOVC2S9tJG66ip/9Oc0=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=