diff --git a/benchmarks/bench_encode.py b/benchmarks/bench_encode.py
index b79eda9..043c3e8 100644
--- a/benchmarks/bench_encode.py
+++ b/benchmarks/bench_encode.py
@@ -13,6 +13,9 @@
 MEDIUM_DATA_ENCODED = base64.b64encode(MEDIUM_DATA)
 LARGE_DATA_ENCODED = base64.b64encode(LARGE_DATA)
 
+MEDIUM_DATA_ENCODEBYTES = base64.encodebytes(MEDIUM_DATA)
+LARGE_DATA_ENCODEBYTES = base64.encodebytes(LARGE_DATA)
+
 
 def stdlib_b64encode(data, altchars=None) -> None:
     for _ in range(ITERATIONS):
@@ -23,6 +26,26 @@ def base64_utils_b64encode(data, altchars=None) -> None:
     for _ in range(ITERATIONS):
         base64_utils.b64encode(data, altchars=altchars)
 
+def stdlib_encodebytes(data) -> None:
+    for _ in range(ITERATIONS):
+        base64.encodebytes(data)
+
+
+def base64_utils_encodebytes(data) -> None:
+    for _ in range(ITERATIONS):
+        base64_utils.encodebytes(data)
+
+
+def stdlib_decodebytes(data) -> None:
+    for _ in range(ITERATIONS):
+        base64.decodebytes(data)
+
+
+def base64_utils_decodebytes(data) -> None:
+    for _ in range(ITERATIONS):
+        base64_utils.decodebytes(data)
+
+
 def stdlib_b64decode(data, altchars=None, validate=False) -> None:
     for _ in range(ITERATIONS):
         base64.b64decode(data, altchars=altchars, validate=validate)
@@ -58,5 +81,25 @@ def base64_utils_b64decode(data, altchars=None, validate=False) -> None:
         lambda: stdlib_b64decode(MEDIUM_DATA_ENCODED),
         lambda: base64_utils_b64decode(MEDIUM_DATA_ENCODED),
         "b64decode (100 KB data)",
-    )
+    ),
+    (
+        lambda: stdlib_encodebytes(MEDIUM_DATA),
+        lambda: base64_utils_encodebytes(MEDIUM_DATA),
+        "encodebytes (100 KB data)",
+    ),
+    (
+        lambda: stdlib_encodebytes(LARGE_DATA),
+        lambda: base64_utils_encodebytes(LARGE_DATA),
+        "encodebytes (1 MB data)",
+    ),
+    (
+        lambda: stdlib_decodebytes(MEDIUM_DATA_ENCODEBYTES),
+        lambda: base64_utils_decodebytes(MEDIUM_DATA_ENCODEBYTES),
+        "decodebytes (100 KB data)",
+    ),
+    (
+        lambda: stdlib_decodebytes(LARGE_DATA_ENCODEBYTES),
+        lambda: base64_utils_decodebytes(LARGE_DATA_ENCODEBYTES),
+        "decodebytes (1 MB data)",
+    ),
 ]
diff --git a/python/base64_utils/__init__.py b/python/base64_utils/__init__.py
index 19a1ad8..b8cf66a 100644
--- a/python/base64_utils/__init__.py
+++ b/python/base64_utils/__init__.py
@@ -2,6 +2,8 @@
     __version__,
     b64decode,
     b64encode,
+    decodebytes,
+    encodebytes,
     standard_b64decode,
     standard_b64encode,
     urlsafe_b64decode,
@@ -12,6 +14,8 @@
     "__version__",
     "b64decode",
     "b64encode",
+    "decodebytes",
+    "encodebytes",
     "standard_b64decode",
     "standard_b64encode",
     "urlsafe_b64decode",
diff --git a/python/base64_utils/__init__.pyi b/python/base64_utils/__init__.pyi
index 7af5c3d..ac6aa01 100644
--- a/python/base64_utils/__init__.pyi
+++ b/python/base64_utils/__init__.pyi
@@ -5,6 +5,8 @@ __version__: str
 __all__ = [
     "b64decode",
     "b64encode",
+    "decodebytes",
+    "encodebytes",
     "standard_b64decode",
     "standard_b64encode",
     "urlsafe_b64decode",
@@ -17,6 +19,8 @@ def b64decode(
     validate: bool = False,
 ) -> bytes: ...
 def b64encode(s: ReadableBuffer, altchars: ReadableBuffer | None = None) -> bytes: ...
+def decodebytes(s: ReadableBuffer) -> bytes: ...
+def encodebytes(s: ReadableBuffer) -> bytes: ...
 def standard_b64decode(s: str | ReadableBuffer) -> bytes: ...
 def standard_b64encode(s: ReadableBuffer) -> bytes: ...
 def urlsafe_b64decode(s: str | ReadableBuffer) -> bytes: ...
diff --git a/src/decoder.rs b/src/decoder.rs
index b1d4a96..75f94de 100644
--- a/src/decoder.rs
+++ b/src/decoder.rs
@@ -95,3 +95,13 @@ pub fn urlsafe_b64decode(py: Python<'_>, s: StringOrBytes) -> PyResult<Py<PyByte
     })?;
     Ok(output.into())
 }
+
+#[pyfunction]
+pub fn decodebytes(py: Python<'_>, s: StringOrBytes) -> PyResult<Py<PyBytes>> {
+    let mut input: Vec<u8> = s.into_bytes();
+    input.retain(|b| !b.is_ascii_whitespace());
+
+    let output = forgiving_decode_inplace(&mut input)
+        .map_err(|_| PyValueError::new_err("Invalid base64-encoded string"))?;
+    Ok(PyBytes::new(py, output).into())
+}
diff --git a/src/encoder.rs b/src/encoder.rs
index d7aaf60..d5fd37c 100644
--- a/src/encoder.rs
+++ b/src/encoder.rs
@@ -3,6 +3,9 @@ use pyo3::exceptions::PyValueError;
 use pyo3::prelude::*;
 use pyo3::types::PyBytes;
 
+const MAXLINESIZE: usize = 76;
+const MAXBINSIZE: usize = 57;
+
 #[pyfunction]
 #[pyo3(signature = (s, altchars=None))]
 pub fn b64encode(py: Python<'_>, s: &[u8], altchars: Option<&[u8]>) -> PyResult<Py<PyBytes>> {
@@ -56,3 +59,23 @@ pub fn urlsafe_b64encode(py: Python<'_>, s: &[u8]) -> PyResult<Py<PyBytes>> {
     })?;
     Ok(output.into())
 }
+
+#[pyfunction]
+pub fn encodebytes(py: Python<'_>, s: &[u8]) -> PyResult<Py<PyBytes>> {
+    let encoded_len = STANDARD.encoded_length(s.len());
+    let num_lines = (encoded_len + MAXLINESIZE - 1) / MAXLINESIZE;
+    let total_len = encoded_len + num_lines; // one \n per line
+
+    let output = PyBytes::new_with(py, total_len, |buf| {
+        let mut pos = 0;
+        for chunk in s.chunks(MAXBINSIZE) {
+            let enc_len = STANDARD.encoded_length(chunk.len());
+            let _ = STANDARD.encode(chunk, Out::from_slice(&mut buf[pos..pos + enc_len]));
+            pos += enc_len;
+            buf[pos] = b'\n';
+            pos += 1;
+        }
+        Ok(())
+    })?;
+    Ok(output.into())
+}
diff --git a/src/lib.rs b/src/lib.rs
index 10cf229..bceff51 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,5 +12,7 @@ fn _base64_utils(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(encoder::b64encode, m)?)?;
     m.add_function(wrap_pyfunction!(encoder::standard_b64encode, m)?)?;
     m.add_function(wrap_pyfunction!(encoder::urlsafe_b64encode, m)?)?;
+    m.add_function(wrap_pyfunction!(encoder::encodebytes, m)?)?;
+    m.add_function(wrap_pyfunction!(decoder::decodebytes, m)?)?;
     Ok(())
 }
diff --git a/tests/test_base64_decode.py b/tests/test_base64_decode.py
index 6ff7bd5..16d539d 100644
--- a/tests/test_base64_decode.py
+++ b/tests/test_base64_decode.py
@@ -74,3 +74,26 @@ def test_urlsafe_b64decode() -> None:
 
     assert isinstance(decoded, bytes)
     assert expected == decoded
+
+
+def test_decodebytes() -> None:
+    data = base64.encodebytes(b"Hello, World!")
+
+    decoded = base64_utils.decodebytes(data)
+    expected = base64.decodebytes(data)
+
+    assert isinstance(decoded, bytes)
+    assert expected == decoded
+
+
+def test_decodebytes_multiline() -> None:
+    data = base64.encodebytes(b"A" * 100)
+
+    decoded = base64_utils.decodebytes(data)
+    expected = base64.decodebytes(data)
+
+    assert expected == decoded
+
+
+def test_decodebytes_empty() -> None:
+    assert base64_utils.decodebytes(b"") == base64.decodebytes(b"")
diff --git a/tests/test_base64_encode.py b/tests/test_base64_encode.py
index 4822bdc..cc0bca3 100644
--- a/tests/test_base64_encode.py
+++ b/tests/test_base64_encode.py
@@ -44,3 +44,26 @@ def test_urlsafe_b64encode() -> None:
 
     assert isinstance(encoded, bytes)
     assert expected == encoded
+
+
+def test_encodebytes() -> None:
+    data = b"Hello, World!"
+    encoded = base64_utils.encodebytes(data)
+    expected = base64.encodebytes(data)
+
+    assert isinstance(encoded, bytes)
+    assert expected == encoded
+
+
+def test_encodebytes_multiline() -> None:
+    data = b"A" * 100
+    encoded = base64_utils.encodebytes(data)
+    expected = base64.encodebytes(data)
+
+    assert expected == encoded
+    lines = encoded.split(b"\n")
+    assert all(len(line) <= 76 for line in lines)
+
+
+def test_encodebytes_empty() -> None:
+    assert base64_utils.encodebytes(b"") == base64.encodebytes(b"")