diff --git a/.rubocop.yml b/.rubocop.yml
index 3e72169..1837b30 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -7,7 +7,7 @@ AllCops:
   NewCops: enable
 
 Metrics/BlockLength:
-  IgnoredMethods: ['describe']
+  AllowedMethods: ['describe']
 
 Style/Documentation:
   Enabled: false
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 46d4e64..0c12689 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+Unreleased
+* Add a command line tool `gmi2html`
+
 v0.2.0
 * Group consecutive links under single paragraph tag
 * Remove spec and hidden files from built gem
diff --git a/README.md b/README.md
index 7a8bcf4..aef12b6 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,9 @@ html_string = File.open('capsule/my_gemtext.gmi', 'r') do |f|
 end
 ```
 
+There is also a command line tool called `gmi2html`.
+Please refer to the help message (`gmi2html --help`) for its usage.
+
 ## Status
 
 Second release but should be feature complete
diff --git a/exe/gmi2html b/exe/gmi2html
new file mode 100755
index 0000000..4a4a3a8
--- /dev/null
+++ b/exe/gmi2html
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'gmi2html'
+require 'optparse'
+
+input = $stdin unless $stdin.tty?
+output = $stdout
+
+parser = OptionParser.new
+parser.on('-o', '--output=PATH', 'Output HTML path.  Standard output is used by default.') do |path|
+  output = File.open(path, 'w')
+end
+parser.on('-i', '--input=PATH', 'Input Gemtext path.  Standard input is used by default.') do |path|
+  input = File.open(path)
+end
+parser.parse!
+
+unless input
+  warn 'No input provided.  Please specify input path or use stdin.'
+  puts parser
+  exit 1
+end
+
+html = Gmi2html::Document.new(input).to_html
+input.close
+
+output.write(html)
+output.close
diff --git a/gmi2html.gemspec b/gmi2html.gemspec
index a3d83c6..041ee1b 100644
--- a/gmi2html.gemspec
+++ b/gmi2html.gemspec
@@ -17,10 +17,10 @@ Gem::Specification.new do |gem|
   gem.license       = 'MIT'
 
   gem.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR).reject do |f|
-                        f.match(%r{^(\.|spec)})
-                      end
-  gem.executables   = gem.files.grep(%r{^bin/}).map { |f| File.basename(f) }
-  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
+    f.match(%r{^(\.|spec)})
+  end
+  gem.bindir        = 'exe'
+  gem.executables   = gem.files.grep(%r{^exe/}).map { |f| File.basename(f) }
   gem.require_paths = %w[lib]
   gem.required_ruby_version = '>= 2.5.0'
 
@@ -28,7 +28,7 @@ Gem::Specification.new do |gem|
     'homepage_uri' => 'https://github.com/jebw/gmi2html/',
     'changelog_uri' => 'https://github.com/jebw/gmi2html/blob/main/CHANGELOG.md',
     'source_code_uri' => 'https://github.com/jebw/gmi2html/',
-    'documentation_uri' => "https://github.com/jebw/gmi2html/blob/main/README.md",
+    'documentation_uri' => 'https://github.com/jebw/gmi2html/blob/main/README.md',
     'bug_tracker_uri' => 'https://github.com/jebw/gmi2html/issues',
     'rubygems_mfa_required' => 'true'
   }
diff --git a/spec/gmi2html/node_renderers/base_spec.rb b/spec/gmi2html/node_renderers/base_spec.rb
index a684ee8..eb9773b 100644
--- a/spec/gmi2html/node_renderers/base_spec.rb
+++ b/spec/gmi2html/node_renderers/base_spec.rb
@@ -19,7 +19,7 @@ def tag
     let(:instance) { described_class.for_gemtext node }
 
     it 'will return a Gmi2html::NodeRenderers::Text' do
-      expect(instance).to be_kind_of Gmi2html::NodeRenderers::Text
+      expect(instance).to be_a Gmi2html::NodeRenderers::Text
     end
 
     it 'will assign the content' do
diff --git a/spec/gmi2html/node_renderers/link_spec.rb b/spec/gmi2html/node_renderers/link_spec.rb
index 29c4dce..f448a6a 100644
--- a/spec/gmi2html/node_renderers/link_spec.rb
+++ b/spec/gmi2html/node_renderers/link_spec.rb
@@ -12,6 +12,9 @@
     let(:link) { Gemtext::Link.new '/my-capsule my capsule' }
 
     context 'when only link' do
+      let(:prev_node) { nil }
+      let(:next_node) { nil }
+
       it 'will render opening and closing p tags in addition to the a tag' do
         expect(rendered).to eql \
           %(<p>\n<a href="/my-capsule">my capsule</a>\n</p>\n)
diff --git a/spec/gmi2html_spec.rb b/spec/gmi2html_spec.rb
index e4ae6a4..72a89fa 100644
--- a/spec/gmi2html_spec.rb
+++ b/spec/gmi2html_spec.rb
@@ -6,6 +6,6 @@
   describe 'VERSION' do
     subject { described_class::VERSION }
 
-    it { is_expected.to eql '0.1.0' }
+    it { is_expected.to eql '0.2.0' }
   end
 end