diff --git a/README.md b/README.md
index 1de6ec4..832da62 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,8 @@ endpoint. All the routes use the same format and general idea.
 Converting a single HTML file into a PDF:
 
 ```python
+from gotenberg_client import GotenbergClient
+
 with GotenbergClient("http://localhost:3000") as client:
     with client.chromium.html_to_pdf() as route:
       response = route.index("my-index.html").run()
@@ -65,6 +67,8 @@ with GotenbergClient("http://localhost:3000") as client:
 Converting an HTML file with additional resources into a PDF:
 
 ```python
+from gotenberg_client import GotenbergClient
+
 with GotenbergClient("http://localhost:3000") as client:
     with client.chromium.html_to_pdf() as route:
       response = route.index("my-index.html").resource("image.png").resource("style.css").run()
@@ -74,6 +78,7 @@ with GotenbergClient("http://localhost:3000") as client:
 Converting an HTML file with additional resources into a PDF/A1a format:
 
 ```python
+from gotenberg_client import GotenbergClient
 from gotenberg_client.options import PdfAFormat
 
 with GotenbergClient("http://localhost:3000") as client:
@@ -85,6 +90,7 @@ with GotenbergClient("http://localhost:3000") as client:
 Converting a URL into PDF, in landscape format
 
 ```python
+from gotenberg_client import GotenbergClient
 from gotenberg_client.options import PageOrientation
 
 with GotenbergClient("http://localhost:3000") as client:
@@ -98,6 +104,8 @@ used as context manager. If for some reason you cannot, you should `.close` the
 routes:
 
 ```python
+from gotenberg_client import GotenbergClient
+
 try:
   client = GotenbergClient("http://localhost:3000")
   try:
diff --git a/src/gotenberg_client/__init__.py b/src/gotenberg_client/__init__.py
index e54c6d9..015889f 100644
--- a/src/gotenberg_client/__init__.py
+++ b/src/gotenberg_client/__init__.py
@@ -1,3 +1,6 @@
 # SPDX-FileCopyrightText: 2023-present Trenton H <rda0128ou@mozmail.com>
 #
 # SPDX-License-Identifier: MPL-2.0
+from gotenberg_client._client import GotenbergClient
+
+__all__ = ["GotenbergClient"]
diff --git a/src/gotenberg_client/base.py b/src/gotenberg_client/_base.py
similarity index 98%
rename from src/gotenberg_client/base.py
rename to src/gotenberg_client/_base.py
index 5061f3b..41a69e8 100644
--- a/src/gotenberg_client/base.py
+++ b/src/gotenberg_client/_base.py
@@ -14,8 +14,8 @@
 from httpx._types import RequestFiles
 
 from gotenberg_client._types_compat import Self
+from gotenberg_client._utils import guess_mime_type
 from gotenberg_client.options import PdfAFormat
-from gotenberg_client.utils import guess_mime_type
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/gotenberg_client/client.py b/src/gotenberg_client/_client.py
similarity index 87%
rename from src/gotenberg_client/client.py
rename to src/gotenberg_client/_client.py
index 50f9bff..e384d29 100644
--- a/src/gotenberg_client/client.py
+++ b/src/gotenberg_client/_client.py
@@ -10,11 +10,11 @@
 
 from httpx import Client
 
-from gotenberg_client.convert.chromium import ChromiumApi
-from gotenberg_client.convert.libre_office import LibreOfficeApi
-from gotenberg_client.convert.pdfa import PdfAApi
-from gotenberg_client.health import HealthCheckApi
-from gotenberg_client.merge import MergeApi
+from gotenberg_client._convert.chromium import ChromiumApi
+from gotenberg_client._convert.libre_office import LibreOfficeApi
+from gotenberg_client._convert.pdfa import PdfAApi
+from gotenberg_client._health import HealthCheckApi
+from gotenberg_client._merge import MergeApi
 
 
 class GotenbergClient:
diff --git a/src/gotenberg_client/convert/__init__.py b/src/gotenberg_client/_convert/__init__.py
similarity index 100%
rename from src/gotenberg_client/convert/__init__.py
rename to src/gotenberg_client/_convert/__init__.py
diff --git a/src/gotenberg_client/convert/chromium.py b/src/gotenberg_client/_convert/chromium.py
similarity index 85%
rename from src/gotenberg_client/convert/chromium.py
rename to src/gotenberg_client/_convert/chromium.py
index 1a0a577..5ffc18f 100644
--- a/src/gotenberg_client/convert/chromium.py
+++ b/src/gotenberg_client/_convert/chromium.py
@@ -9,9 +9,9 @@
 from typing import List
 from typing import Union
 
+from gotenberg_client._base import BaseApi
+from gotenberg_client._convert.common import ConvertBaseRoute
 from gotenberg_client._types_compat import Self
-from gotenberg_client.base import BaseApi
-from gotenberg_client.convert.common import ConvertBaseRoute
 from gotenberg_client.options import EmulatedMediaType
 from gotenberg_client.options import Margin
 from gotenberg_client.options import PageSize
@@ -28,25 +28,6 @@ def __bool__(self) -> bool:
 FORCE_MULTIPART: Final = ForceMultipartDict()
 
 
-# Define common paper sizes as shortcuts
-A0: Final = PageSize(width=33.1, height=46.8)
-A1: Final = PageSize(width=23.4, height=33.1)
-A2: Final = PageSize(width=16.54, height=23.4)
-A3: Final = PageSize(width=11.7, height=16.54)
-A4: Final = PageSize(width=8.5, height=11)
-A5: Final = PageSize(width=5.83, height=8.27)
-A6: Final = PageSize(width=4.13, height=5.83)
-Letter = A4
-Legal: Final = PageSize(width=8.5, height=14)
-Tabloid: Final = PageSize(width=11, height=17)
-Ledge: Final = PageSize(width=17, height=11)
-
-
-Gotenberg_Default_Margines: Final = Margin(0.39, 0.39, 0.39, 0.39)
-Word_Default_Margins: Final = Margin(top=1.0, bottom=1.0, left=1.0, right=1.0)
-Word_Narrow_Margins: Final = Margin(top=0.5, bottom=0.5, left=0.5, right=0.5)
-
-
 class ChromiumBaseRoute(ConvertBaseRoute):
     """
     https://gotenberg.dev/docs/routes#convert-with-chromium
diff --git a/src/gotenberg_client/convert/common.py b/src/gotenberg_client/_convert/common.py
similarity index 94%
rename from src/gotenberg_client/convert/common.py
rename to src/gotenberg_client/_convert/common.py
index 72a6d45..afb88fb 100644
--- a/src/gotenberg_client/convert/common.py
+++ b/src/gotenberg_client/_convert/common.py
@@ -3,8 +3,8 @@
 # SPDX-License-Identifier: MPL-2.0
 import logging
 
+from gotenberg_client._base import BaseRoute
 from gotenberg_client._types_compat import Self
-from gotenberg_client.base import BaseRoute
 from gotenberg_client.options import PageOrientation
 
 logger = logging.getLogger()
diff --git a/src/gotenberg_client/convert/libre_office.py b/src/gotenberg_client/_convert/libre_office.py
similarity index 93%
rename from src/gotenberg_client/convert/libre_office.py
rename to src/gotenberg_client/_convert/libre_office.py
index 3a35dfb..65654f8 100644
--- a/src/gotenberg_client/convert/libre_office.py
+++ b/src/gotenberg_client/_convert/libre_office.py
@@ -4,9 +4,9 @@
 from pathlib import Path
 from typing import List
 
+from gotenberg_client._base import BaseApi
+from gotenberg_client._convert.common import ConvertBaseRoute
 from gotenberg_client._types_compat import Self
-from gotenberg_client.base import BaseApi
-from gotenberg_client.convert.common import ConvertBaseRoute
 
 
 class LibreOfficeConvertRoute(ConvertBaseRoute):
diff --git a/src/gotenberg_client/convert/pdfa.py b/src/gotenberg_client/_convert/pdfa.py
similarity index 89%
rename from src/gotenberg_client/convert/pdfa.py
rename to src/gotenberg_client/_convert/pdfa.py
index 2f9ec90..d0ba3e2 100644
--- a/src/gotenberg_client/convert/pdfa.py
+++ b/src/gotenberg_client/_convert/pdfa.py
@@ -4,9 +4,9 @@
 from pathlib import Path
 from typing import List
 
+from gotenberg_client._base import BaseApi
+from gotenberg_client._convert.common import ConvertBaseRoute
 from gotenberg_client._types_compat import Self
-from gotenberg_client.base import BaseApi
-from gotenberg_client.convert.common import ConvertBaseRoute
 
 
 class PdfAConvertRoute(ConvertBaseRoute):
diff --git a/src/gotenberg_client/health.py b/src/gotenberg_client/_health.py
similarity index 98%
rename from src/gotenberg_client/health.py
rename to src/gotenberg_client/_health.py
index c76f36d..3f717bc 100644
--- a/src/gotenberg_client/health.py
+++ b/src/gotenberg_client/_health.py
@@ -9,7 +9,7 @@
 from typing import TypedDict
 from typing import no_type_check
 
-from gotenberg_client.base import BaseApi
+from gotenberg_client._base import BaseApi
 
 _TIME_RE = re.compile(
     r"(?P<year>\d{4})-"
diff --git a/src/gotenberg_client/merge.py b/src/gotenberg_client/_merge.py
similarity index 91%
rename from src/gotenberg_client/merge.py
rename to src/gotenberg_client/_merge.py
index 7d48bea..52848a1 100644
--- a/src/gotenberg_client/merge.py
+++ b/src/gotenberg_client/_merge.py
@@ -4,8 +4,8 @@
 from pathlib import Path
 from typing import List
 
-from gotenberg_client.base import BaseApi
-from gotenberg_client.base import BaseRoute
+from gotenberg_client._base import BaseApi
+from gotenberg_client._base import BaseRoute
 
 
 class MergeRoute(BaseRoute):
diff --git a/src/gotenberg_client/metrics.py b/src/gotenberg_client/_metrics.py
similarity index 100%
rename from src/gotenberg_client/metrics.py
rename to src/gotenberg_client/_metrics.py
diff --git a/src/gotenberg_client/utils.py b/src/gotenberg_client/_utils.py
similarity index 100%
rename from src/gotenberg_client/utils.py
rename to src/gotenberg_client/_utils.py
diff --git a/src/gotenberg_client/options.py b/src/gotenberg_client/options.py
index 8f58d8e..4751de7 100644
--- a/src/gotenberg_client/options.py
+++ b/src/gotenberg_client/options.py
@@ -4,10 +4,11 @@
 import dataclasses
 import enum
 from typing import Dict
+from typing import Final
 from typing import Optional
 from typing import Union
 
-from gotenberg_client.utils import optional_to_form
+from gotenberg_client._utils import optional_to_form
 
 
 @enum.unique
@@ -52,6 +53,20 @@ def to_form(self) -> Dict[str, str]:
         return data
 
 
+# Define common paper sizes as shortcuts
+A0: Final = PageSize(width=33.1, height=46.8)
+A1: Final = PageSize(width=23.4, height=33.1)
+A2: Final = PageSize(width=16.54, height=23.4)
+A3: Final = PageSize(width=11.7, height=16.54)
+A4: Final = PageSize(width=8.5, height=11)
+A5: Final = PageSize(width=5.83, height=8.27)
+A6: Final = PageSize(width=4.13, height=5.83)
+Letter = A4
+Legal: Final = PageSize(width=8.5, height=14)
+Tabloid: Final = PageSize(width=11, height=17)
+Ledge: Final = PageSize(width=17, height=11)
+
+
 @dataclasses.dataclass
 class Margin:
     top: Optional[Union[float, int]] = None
@@ -67,6 +82,11 @@ def to_form(self) -> Dict[str, str]:
         return data
 
 
+Gotenberg_Default_Margins: Final = Margin(0.39, 0.39, 0.39, 0.39)
+Word_Default_Margins: Final = Margin(top=1.0, bottom=1.0, left=1.0, right=1.0)
+Word_Narrow_Margins: Final = Margin(top=0.5, bottom=0.5, left=0.5, right=0.5)
+
+
 @enum.unique
 class EmulatedMediaType(str, enum.Enum):
     Print = enum.auto()
diff --git a/tests/conftest.py b/tests/conftest.py
index 7b2ba4a..a8ff35c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -6,7 +6,7 @@
 
 import pytest
 
-from gotenberg_client.client import GotenbergClient
+from gotenberg_client._client import GotenbergClient
 
 GOTENBERG_URL: Final[str] = os.getenv("GOTENBERG_URL", "http://localhost:3000")
 
diff --git a/tests/test_convert_chromium_html.py b/tests/test_convert_chromium_html.py
index 026f410..d9e790c 100644
--- a/tests/test_convert_chromium_html.py
+++ b/tests/test_convert_chromium_html.py
@@ -6,9 +6,9 @@
 from httpx import codes
 from pytest_httpx import HTTPXMock
 
-from gotenberg_client.client import GotenbergClient
-from gotenberg_client.convert.chromium import A4
-from gotenberg_client.convert.chromium import Margin
+from gotenberg_client._client import GotenbergClient
+from gotenberg_client._convert.chromium import Margin
+from gotenberg_client.options import A4
 from gotenberg_client.options import PageOrientation
 from gotenberg_client.options import PdfAFormat
 from tests.conftest import SAMPLE_DIR
diff --git a/tests/test_convert_chromium_markdown.py b/tests/test_convert_chromium_markdown.py
index 3c45521..e300053 100644
--- a/tests/test_convert_chromium_markdown.py
+++ b/tests/test_convert_chromium_markdown.py
@@ -1,6 +1,6 @@
 from httpx import codes
 
-from gotenberg_client.client import GotenbergClient
+from gotenberg_client._client import GotenbergClient
 from tests.conftest import SAMPLE_DIR
 
 
diff --git a/tests/test_convert_chromium_url.py b/tests/test_convert_chromium_url.py
index bee4bfd..5674ee6 100644
--- a/tests/test_convert_chromium_url.py
+++ b/tests/test_convert_chromium_url.py
@@ -4,8 +4,8 @@
 from httpx import codes
 from pytest_httpx import HTTPXMock
 
-from gotenberg_client.client import GotenbergClient
-from gotenberg_client.convert.chromium import EmulatedMediaType
+from gotenberg_client._client import GotenbergClient
+from gotenberg_client._convert.chromium import EmulatedMediaType
 from tests.utils import verify_stream_contains
 
 
diff --git a/tests/test_convert_libre_office.py b/tests/test_convert_libre_office.py
index dfe62cd..1933742 100644
--- a/tests/test_convert_libre_office.py
+++ b/tests/test_convert_libre_office.py
@@ -6,9 +6,9 @@
 import pytest
 from httpx import codes
 
-from gotenberg_client.client import GotenbergClient
+from gotenberg_client._client import GotenbergClient
+from gotenberg_client._utils import guess_mime_type_stdlib
 from gotenberg_client.options import PdfAFormat
-from gotenberg_client.utils import guess_mime_type_stdlib
 from tests.conftest import SAMPLE_DIR
 from tests.conftest import SAVE_DIR
 from tests.conftest import SAVE_OUTPUTS
@@ -86,7 +86,7 @@ def test_libre_office_convert_multiples_format_merged(self, client: GotenbergCli
             (SAVE_DIR / "test_libre_office_convert_multiples_format.zip").write_bytes(resp.content)
 
     def test_libre_office_convert_std_lib_mime(self, client: GotenbergClient):
-        with patch("gotenberg_client.utils.guess_mime_type") as mocked_guess_mime_type:
+        with patch("gotenberg_client._utils.guess_mime_type") as mocked_guess_mime_type:
             mocked_guess_mime_type.side_effect = guess_mime_type_stdlib
             with client.libre_office.to_pdf() as route:
                 resp = route.convert_files([SAMPLE_DIR / "sample.docx", SAMPLE_DIR / "sample.odt"]).no_merge().run()
diff --git a/tests/test_convert_pdf_a.py b/tests/test_convert_pdf_a.py
index 184b65e..8b80c25 100644
--- a/tests/test_convert_pdf_a.py
+++ b/tests/test_convert_pdf_a.py
@@ -5,7 +5,7 @@
 import pytest
 from httpx import codes
 
-from gotenberg_client.client import GotenbergClient
+from gotenberg_client._client import GotenbergClient
 from gotenberg_client.options import PdfAFormat
 from tests.conftest import SAMPLE_DIR
 from tests.conftest import SAVE_DIR
diff --git a/tests/test_health.py b/tests/test_health.py
index 5f26b4a..84f415e 100644
--- a/tests/test_health.py
+++ b/tests/test_health.py
@@ -1,5 +1,5 @@
-from gotenberg_client.client import GotenbergClient
-from gotenberg_client.health import StatusOptions
+from gotenberg_client._client import GotenbergClient
+from gotenberg_client._health import StatusOptions
 
 
 class TestHealthStatus:
diff --git a/tests/test_merge.py b/tests/test_merge.py
index be18b08..7ccc1f6 100644
--- a/tests/test_merge.py
+++ b/tests/test_merge.py
@@ -7,7 +7,7 @@
 import pytest
 from httpx import codes
 
-from gotenberg_client.client import GotenbergClient
+from gotenberg_client._client import GotenbergClient
 from gotenberg_client.options import PdfAFormat
 from tests.conftest import SAMPLE_DIR
 from tests.conftest import SAVE_DIR