diff --git a/cmd/new.go b/cmd/new.go
index af6f147..5b0bcbf 100644
--- a/cmd/new.go
+++ b/cmd/new.go
@@ -3,15 +3,43 @@ package cmd
 import (
 	"fmt"
 
+	"github.com/mickael-menu/zk/core/note"
 	"github.com/mickael-menu/zk/core/zk"
+	"github.com/mickael-menu/zk/util/opt"
 )
 
+// New adds a new note to the slip box.
 type New struct {
-	Directory string `arg optional name:"directory" default:"."`
+	Directory string            `arg optional type:"path" default:"." help:"Directory in which to create the note"`
+	ShowPath  bool              `help:"Shows the path of the created note instead of editing it"`
+	Title     string            `short:"t" help:"Title of the new note" placeholder:"TITLE"`
+	Template  string            `type:"path" help:"Custom template to use to render the note" placeholder:"PATH"`
+	Extra     map[string]string `help:"Extra variables passed to the templates"`
 }
 
-func (cmd *New) Run() error {
-	zk, err := zk.Open(cmd.Directory)
-	fmt.Printf("%+v\n", zk)
-	return err
+func (cmd *New) Run(container *Container) error {
+	zk, err := zk.Open(".")
+	if err != nil {
+		return err
+	}
+
+	dir, err := zk.DirAt(cmd.Directory)
+	if err != nil {
+		return err
+	}
+
+	opts := note.CreateOpts{
+		Dir:      *dir,
+		Title:    opt.NewNotEmptyString(cmd.Title),
+		Content:  opt.NullString,
+		Template: opt.NewNotEmptyString(cmd.Template),
+		Extra:    cmd.Extra,
+	}
+	file, err := note.Create(zk, opts, container.Renderer())
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("%+v\n", file)
+	return nil
 }
diff --git a/core/note/note.go b/core/note/note.go
new file mode 100644
index 0000000..16a66ec
--- /dev/null
+++ b/core/note/note.go
@@ -0,0 +1,124 @@
+package note
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/mickael-menu/zk/core/zk"
+	"github.com/mickael-menu/zk/util/errors"
+	"github.com/mickael-menu/zk/util/opt"
+	"github.com/mickael-menu/zk/util/paths"
+	"github.com/mickael-menu/zk/util/rand"
+)
+
+// Renderer renders templates.
+type Renderer interface {
+	// Render renders a handlebars string template with the given context.
+	Render(template string, context interface{}) (string, error)
+	// RenderFile renders a handlebars template file with the given context.
+	RenderFile(path string, context interface{}) (string, error)
+}
+
+// CreateOpts holds the options to create a new note.
+type CreateOpts struct {
+	// Parent directory for the new note.
+	Dir zk.Dir
+	// Title of the note.
+	Title opt.String
+	// Initial content of the note, which will be injected in the template.
+	Content opt.String
+	// Custom template to use for the note, overriding the one declared in the config.
+	Template opt.String
+	// Extra template variables to expand.
+	Extra map[string]string
+}
+
+// Create generates a new note in the given slip box from the given options.
+func Create(zk *zk.Zk, opts CreateOpts, renderer Renderer) (string, error) {
+	wrap := errors.Wrapper("note creation failed")
+
+	exists, err := paths.Exists(opts.Dir.Path)
+	if err != nil {
+		return "", wrap(err)
+	}
+	if !exists {
+		return "", wrap(fmt.Errorf("directory not found at %v", opts.Dir.Path))
+	}
+
+	extra := zk.Extra(opts.Dir)
+	for k, v := range opts.Extra {
+		extra[k] = v
+	}
+
+	context := renderContext{
+		// FIXME Customize default title in config
+		Title:   opts.Title.OrDefault("Untitled"),
+		Content: opts.Content.Unwrap(),
+		Extra:   extra,
+	}
+
+	file, err := genFilepath(zk, opts.Dir, renderer, &context)
+	if err != nil {
+		return "", wrap(err)
+	}
+
+	template := opts.Template.OrDefault(
+		zk.Template(opts.Dir).OrDefault(""),
+	)
+	if template != "" {
+		content, err := renderer.RenderFile(template, context)
+		if err != nil {
+			return "", wrap(err)
+		}
+		err = paths.WriteString(path, content)
+		if err != nil {
+			return "", wrap(err)
+		}
+	}
+
+	return file, nil
+}
+
+// renderContext holds the placeholder values which will be expanded in the templates.
+type renderContext struct {
+	Title        string
+	Content      string
+	Filename     string
+	FilenameStem string `handlebars:"filename-stem"`
+	RandomID     string `handlebars:"random-id"`
+	Extra        map[string]string
+}
+
+func genFilepath(zk *zk.Zk, dir zk.Dir, renderer Renderer, context *renderContext) (string, error) {
+	template := zk.FilenameTemplate(dir)
+	isRandom := strings.Contains(template, "random-id")
+
+	i := 0
+	for {
+		context.RandomID = rand.GenID(zk.RandIDOpts(dir))
+
+		filename, err := renderer.Render(template, context)
+		if err != nil {
+			return "", err
+		}
+
+		// FIXME Customize extension in config
+		path := filepath.Join(dir.Path, filename+".md")
+		exists, err := paths.Exists(path)
+		if err != nil {
+			return "", err
+		}
+
+		if !exists {
+			context.Filename = filepath.Base(path)
+			context.FilenameStem = paths.FilenameStem(path)
+			return path, nil
+
+		} else if !isRandom || i > 50 { // Attempts 50 tries if the filename template contains a random ID before failing.
+			return "", fmt.Errorf("%v: file already exists", path)
+		}
+
+		i++
+	}
+}
diff --git a/util/opt/opt.go b/util/opt/opt.go
index 87baaf0..1b542ef 100644
--- a/util/opt/opt.go
+++ b/util/opt/opt.go
@@ -41,3 +41,7 @@ func (s String) OrDefault(def string) string {
 func (s String) Unwrap() string {
 	return s.OrDefault("")
 }
+
+func (s String) String() string {
+	return s.OrDefault("")
+}
diff --git a/util/paths/paths.go b/util/paths/paths.go
new file mode 100644
index 0000000..3945ead
--- /dev/null
+++ b/util/paths/paths.go
@@ -0,0 +1,37 @@
+package paths
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// Exists returns whether the given path exists on the file system.
+func Exists(path string) (bool, error) {
+	if _, err := os.Stat(path); err == nil {
+		return true, nil
+	} else if os.IsNotExist(err) {
+		return false, nil
+	} else {
+		return false, err
+	}
+}
+
+// FilenameStem returns the filename component of the given path,
+// after removing its file extension.
+func FilenameStem(path string) string {
+	filename := filepath.Base(path)
+	ext := filepath.Ext(filename)
+	return strings.TrimSuffix(filename, ext)
+}
+
+// WriteString writes the given content into a new file at the given path.
+func WriteString(path string, content string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = f.WriteString(content)
+	return err
+}