diff --git a/README.md b/README.md
index 7439286..f8d6595 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,9 @@ is a tool for testing a CSAF Trusted Provider according to [Section 7 of the CSA
 ## [csaf_downloader](docs/csaf_downloader.md)
 is a tool for downloading advisories from a provider.
 
+## [csaf_validator](docs/csaf_validator.md)
+is a tool to validate local advisories files against the JSON Schema and an optional remote validator.
+
 ## Setup
 Note that binaries for the server side are only available and tested
 for GNU/Linux-Systems, e.g. Ubuntu LTS.
diff --git a/cmd/csaf_validator/main.go b/cmd/csaf_validator/main.go
new file mode 100644
index 0000000..1603ee3
--- /dev/null
+++ b/cmd/csaf_validator/main.go
@@ -0,0 +1,130 @@
+// This file is Free Software under the MIT License
+// without warranty, see README.md and LICENSES/MIT.txt for details.
+//
+// SPDX-License-Identifier: MIT
+//
+// SPDX-FileCopyrightText: 2023 German Federal Office for Information Security (BSI) <https://www.bsi.bund.de>
+// Software-Engineering: 2023 Intevation GmbH <https://intevation.de>
+
+// Package main implements the csaf_validator tool.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/csaf-poc/csaf_distribution/csaf"
+	"github.com/csaf-poc/csaf_distribution/util"
+	"github.com/jessevdk/go-flags"
+)
+
+type options struct {
+	Version                bool     `long:"version" description:"Display version of the binary"`
+	RemoteValidator        string   `long:"validator" description:"URL to validate documents remotely" value-name:"URL"`
+	RemoteValidatorCache   string   `long:"validatorcache" description:"FILE to cache remote validations" value-name:"FILE"`
+	RemoteValidatorPresets []string `long:"validatorpreset" description:"One or more presets to validate remotely" default:"mandatory"`
+}
+
+func main() {
+	opts := new(options)
+
+	parser := flags.NewParser(opts, flags.Default)
+	parser.Usage = "[OPTIONS] files..."
+	files, err := parser.Parse()
+	errCheck(err)
+
+	if opts.Version {
+		fmt.Println(util.SemVersion)
+		return
+	}
+
+	if len(files) == 0 {
+		log.Println("No domains given.")
+		return
+	}
+
+	errCheck(run(opts, files))
+}
+
+// run validates the given files.
+func run(opts *options, files []string) error {
+
+	var validator csaf.RemoteValidator
+
+	if opts.RemoteValidator != "" {
+		validatorOptions := csaf.RemoteValidatorOptions{
+			URL:     opts.RemoteValidator,
+			Presets: opts.RemoteValidatorPresets,
+			Cache:   opts.RemoteValidatorCache,
+		}
+		var err error
+		if validator, err = validatorOptions.Open(); err != nil {
+			return fmt.Errorf(
+				"preparing remote validator failed: %w", err)
+		}
+		defer validator.Close()
+	}
+
+	for _, file := range files {
+		doc, err := loadJSONFromFile(file)
+		if err != nil {
+			log.Printf("error: loading %q as JSON failed: %v\n", file, err)
+			continue
+		}
+		// Validate agsinst Schema.
+		validationErrs, err := csaf.ValidateCSAF(doc)
+		if err != nil {
+			log.Printf("error: validating %q against schema failed: %v\n",
+				file, err)
+
+		}
+		if len(validationErrs) > 0 {
+			fmt.Printf("schema validation errors of %q\n", file)
+			for _, vErr := range validationErrs {
+				fmt.Printf("  * %s\n", vErr)
+			}
+		} else {
+			fmt.Printf("%s passes the schema validation.\n", file)
+		}
+		// Validate against remote validator.
+		validate, err := validator.Validate(doc)
+		if err != nil {
+			return fmt.Errorf("remote validation of %q failed: %w",
+				file, err)
+		}
+		var passes string
+		if validate {
+			passes = "passes"
+		} else {
+			passes = "does not pass"
+		}
+		fmt.Printf("%q %s remote validation.\n", file, passes)
+	}
+
+	return nil
+}
+
+func errCheck(err error) {
+	if err != nil {
+		if flags.WroteHelp(err) {
+			os.Exit(0)
+		}
+		log.Fatalf("error: %v\n", err)
+	}
+}
+
+// loadJSONFromFile loads a JSON document from a file.
+func loadJSONFromFile(fname string) (any, error) {
+	f, err := os.Open(fname)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	var doc any
+	if err = json.NewDecoder(f).Decode(&doc); err != nil {
+		return nil, err
+	}
+	return doc, err
+}
diff --git a/docs/csaf_validator.md b/docs/csaf_validator.md
new file mode 100644
index 0000000..8aefa43
--- /dev/null
+++ b/docs/csaf_validator.md
@@ -0,0 +1,18 @@
+## csaf_validator
+
+is a tool to validate local advisories files against the JSON Schema and an optional remote validator.
+
+### Usage
+
+```
+csaf_validator [OPTIONS] files...
+
+Application Options:
+      --version                Display version of the binary
+      --validator=URL          URL to validate documents remotely
+      --validatorcache=FILE    FILE to cache remote validations
+      --validatorpreset=       One or more presets to validate remotely (default: mandatory)
+
+Help Options:
+  -h, --help                   Show this help message
+```