diff --git a/.github/workflows/release_notes.sh b/.github/workflows/release_notes.sh
index e868116..a08022d 100755
--- a/.github/workflows/release_notes.sh
+++ b/.github/workflows/release_notes.sh
@@ -14,6 +14,7 @@ wget https://github.com/busyloop/envcat/releases/download/v${VERSION}/envcat-${V
 chmod +x envcat-${VERSION}.darwin-x86_64
 sudo mv envcat-${VERSION}.darwin-x86_64 /usr/local/bin
 sudo ln -sf /usr/local/bin/envcat-${VERSION}.darwin-x86_64 /usr/local/bin/envcat
+sudo ln -sf /usr/local/bin/envcat-${VERSION}.darwin-x86_64 /usr/local/bin/envtpl
 \`\`\`
 
 ## Linux
@@ -23,6 +24,7 @@ wget https://github.com/busyloop/envcat/releases/download/v${VERSION}/envcat-${V
 chmod +x envcat-${VERSION}.linux-x86_64
 sudo mv envcat-${VERSION}.linux-x86_64 /usr/bin
 sudo ln -sf /usr/bin/envcat-${VERSION}.linux-x86_64 /usr/bin/envcat
+sudo ln -sf /usr/bin/envcat-${VERSION}.linux-x86_64 /usr/bin/envtpl
 \`\`\`
 
 
diff --git a/README.md b/README.md
index ee90296..e6e0417 100644
--- a/README.md
+++ b/README.md
@@ -26,13 +26,13 @@ Do not edit this file. Edit 'docs/templates/README.md.j2' instead and run 'make
 
 | OS           | Arch    | Version               |      |
 | ------------ | ------- | --------------------- | ---- |
-| OSX (Darwin) | x86_64  | 1.0.0 (latest)  | [Download](https://github.com/busyloop/envcat/releases/tag/v1.0.0) |
-| Linux        | x86_64  | 1.0.0 (latest)  | [Download](https://github.com/busyloop/envcat/releases/tag/v1.0.0) |
-| Linux        | aarch64 | 1.0.0 (latest)  | [Download](https://github.com/busyloop/envcat/releases/tag/v1.0.0) |
+| OSX (Darwin) | x86_64  | 1.0.1 (latest)  | [Download](https://github.com/busyloop/envcat/releases/tag/v1.0.1) |
+| Linux        | x86_64  | 1.0.1 (latest)  | [Download](https://github.com/busyloop/envcat/releases/tag/v1.0.1) |
+| Linux        | aarch64 | 1.0.1 (latest)  | [Download](https://github.com/busyloop/envcat/releases/tag/v1.0.1) |
 
 #### Dockerfile
 
-See the [download page](https://github.com/busyloop/envcat/releases/tag/v1.0.0) for an example Dockerfile. :whale:
+See the [download page](https://github.com/busyloop/envcat/releases/tag/v1.0.1) for an example Dockerfile. :whale:
 
 
 ## Usage
@@ -60,7 +60,7 @@ echo "{{BIND}}:{{PORT | default('443')}} {{NAME}}" | envcat -f j2 -c PORT:?port
 
 ## Templating
 
-With `-f j2` envcat renders a jinja2 template from _stdin_ to _stdout_.  
+With `-f j2`, or when called by the name `envtpl`, envcat renders a jinja2 template from _stdin_ to _stdout_.  
 Environment variables are available as `{{VAR}}`.
 
 envcat will abort with code 5 if your template references an undefined variable,  
@@ -78,15 +78,49 @@ unset NOPE
 echo "{{FOO}}"                                          | envcat -f j2 FOO  # => a,b,c
 echo "{{NOPE | default('empty')}}"                      | envcat -f j2 NOPE # => empty
 echo "{% for x in FOO | split(',') %}{{x}}{% endfor %}" | envcat -f j2 FOO  # => abc
-echo "{% if FOO == 'd,e,f' %}A{% else %}B{% endif %}"   | envcat -f j2 FOO  # => B
-echo "{% if BAR | int + 1 == 42 %}yes{% endif %}"       | envcat -f j2 BAR  # => yes
+echo "{% if FOO == 'd,e,f' %}A{% else %}B{% endif %}"   | envtpl FOO        # => B
+echo "{% if BAR | int + 1 == 42 %}yes{% endif %}"       | envtpl BAR        # => yes
 ```
 
-If you need more, please consult the [jinja2 documentation](https://jinja.palletsprojects.com/en/2.11.x/templates/).
 
-**Note:**
-There are some [subtle differences](https://straight-shoota.github.io/crinja/#:~:text=Differences%20from%20Jinja2) between [the jinja2 library used in envcat](https://straight-shoota.github.io/crinja/) and the original Python jinja2.  
-But likely none that you will encounter in normal usage.
+## Template syntax
+
+Envcat supports most jinja2 syntax and [builtin filters](https://jinja.palletsprojects.com/en/2.11.x/templates/#list-of-builtin-filters).
+
+On top it provides the following additional filters:
+
+#### b64encode, b64encode_urlsafe
+
+```bash
+export FOO="hello? world?"
+
+# b64encode, b64encode_urlsafe
+echo "{{FOO | b64encode}}"                              | envtpl FOO  # => aGVsbG8/IHdvcmxkPw==
+echo "{{FOO | b64encode_urlsafe}}"                      | envtpl FOO  # => aGVsbG8_IHdvcmxkPw==
+```
+
+#### b64decode
+
+```bash
+export B64_REGULAR="aGVsbG8/IHdvcmxkPw=="
+export B64_URLSAFE="aGVsbG8_IHdvcmxkPw=="
+
+echo "{{B64_REGULAR | b64decode}}"                      | envtpl 'B*' # => hello? world?
+echo "{{B64_URLSAFE | b64decode}}"                      | envtpl 'B*' # => hello? world?
+```
+
+#### split
+
+
+```bash
+export FOO=a,b,c
+
+echo "{% for x in FOO | split(',') %}{{x}}..{% endfor %}" | envtpl FOO  # => a..b..c..
+```
+
+**Note:**  
+Envcat uses a [Crystal implementation of the jinja2 template engine](https://straight-shoota.github.io/crinja/).  
+Python expressions are **not** supported.
 
 
 ## Checks
@@ -210,7 +244,3 @@ $ envcat -f json VARS_ETF:etf A B C
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create a new Pull Request
-
-## Contributors
-
-- [moe](https://github.com/m-o-e) - creator and maintainer
diff --git a/docs/templates/README.md.j2 b/docs/templates/README.md.j2
index b0d9bc8..f5173de 100644
--- a/docs/templates/README.md.j2
+++ b/docs/templates/README.md.j2
@@ -63,7 +63,7 @@ echo "{{BIND}}:{{PORT | default('443')}} {{NAME}}" | envcat -f j2 -c PORT:?port
 
 ## Templating
 
-With `-f j2` envcat renders a jinja2 template from _stdin_ to _stdout_.  
+With `-f j2`, or when called by the name `envtpl`, envcat renders a jinja2 template from _stdin_ to _stdout_.  
 Environment variables are available as `{{VAR}}`.
 
 envcat will abort with code 5 if your template references an undefined variable,  
@@ -81,15 +81,49 @@ unset NOPE
 echo "{{FOO}}"                                          | envcat -f j2 FOO  # => a,b,c
 echo "{{NOPE | default('empty')}}"                      | envcat -f j2 NOPE # => empty
 echo "{% for x in FOO | split(',') %}{{x}}{% endfor %}" | envcat -f j2 FOO  # => abc
-echo "{% if FOO == 'd,e,f' %}A{% else %}B{% endif %}"   | envcat -f j2 FOO  # => B
-echo "{% if BAR | int + 1 == 42 %}yes{% endif %}"       | envcat -f j2 BAR  # => yes
+echo "{% if FOO == 'd,e,f' %}A{% else %}B{% endif %}"   | envtpl FOO        # => B
+echo "{% if BAR | int + 1 == 42 %}yes{% endif %}"       | envtpl BAR        # => yes
 ```
 
-If you need more, please consult the [jinja2 documentation](https://jinja.palletsprojects.com/en/2.11.x/templates/).
 
-**Note:**
-There are some [subtle differences](https://straight-shoota.github.io/crinja/#:~:text=Differences%20from%20Jinja2) between [the jinja2 library used in envcat](https://straight-shoota.github.io/crinja/) and the original Python jinja2.  
-But likely none that you will encounter in normal usage.
+## Template syntax
+
+Envcat supports most jinja2 syntax and [builtin filters](https://jinja.palletsprojects.com/en/2.11.x/templates/#list-of-builtin-filters).
+
+On top it provides the following additional filters:
+
+#### b64encode, b64encode_urlsafe
+
+```bash
+export FOO="hello? world?"
+
+# b64encode, b64encode_urlsafe
+echo "{{FOO | b64encode}}"                              | envtpl FOO  # => aGVsbG8/IHdvcmxkPw==
+echo "{{FOO | b64encode_urlsafe}}"                      | envtpl FOO  # => aGVsbG8_IHdvcmxkPw==
+```
+
+#### b64decode
+
+```bash
+export B64_REGULAR="aGVsbG8/IHdvcmxkPw=="
+export B64_URLSAFE="aGVsbG8_IHdvcmxkPw=="
+
+echo "{{B64_REGULAR | b64decode}}"                      | envtpl 'B*' # => hello? world?
+echo "{{B64_URLSAFE | b64decode}}"                      | envtpl 'B*' # => hello? world?
+```
+
+#### split
+
+
+```bash
+export FOO=a,b,c
+
+echo "{% for x in FOO | split(',') %}{{x}}..{% endfor %}" | envtpl FOO  # => a..b..c..
+```
+
+**Note:**  
+Envcat uses a [Crystal implementation of the jinja2 template engine](https://straight-shoota.github.io/crinja/).  
+Python expressions are **not** supported.
 
 
 ## Checks
@@ -161,8 +195,4 @@ $ envcat -f json VARS_ETF:etf A B C
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create a new Pull Request
-
-## Contributors
-
-- [moe](https://github.com/m-o-e) - creator and maintainer
 {% endraw %}
diff --git a/shard.yml b/shard.yml
index ab1f5fb..421b3ec 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: envcat
-version: 1.0.0
+version: 1.0.1
 
 authors:
   - moe <moe@busyloop.net>
diff --git a/src/envcat/cli.cr b/src/envcat/cli.cr
index 77d88e2..abc2e6c 100644
--- a/src/envcat/cli.cr
+++ b/src/envcat/cli.cr
@@ -29,9 +29,9 @@ class Envcat::Cli
   Toka.mapping({
     format: {
       type:        String,
-      default:     Format::DEFAULT,
+      default:     Envcat::Cli.default_format,
       value_name:  "FORMAT",
-      description: Format.keys.sort!.join("|") + " (default: #{Format::DEFAULT})",
+      description: Format.keys.sort!.join("|") + " (default: #{Envcat::Cli.default_format})",
     },
     check: {
       type:        Array(String),
@@ -53,6 +53,10 @@ class Envcat::Cli
     help:   false,
   })
 
+  def self.default_format
+    PROGRAM_NAME.try &.includes?("envtpl") ? "j2" : Format::DEFAULT
+  end
+
   def self.help
     String.build(4096) do |s|
       s.puts "FORMAT"