diff --git a/doc/benchmarks.rst b/doc/benchmarks.rst
@@ -76,6 +76,32 @@ These benchmarks also have an "eager" flavor that uses asyncio eager task factor
 if available.
 
 
+base64
+------
+
+Benchmark the ``base64`` module's encoding and decoding functions. Each
+algorithm has ``_small`` and ``_large`` variants that test both encode and
+decode in a single benchmark:
+
+* ``_small``: Balanced iterations across 20B, 127B, 3KiB, and 9KB data sizes
+  more likely to show the impact of overhead.
+* ``_large``: Large data focus with 100KiB and ~1MiB data sizes likely to
+  demonstrate implementation efficiency.
+
+Available benchmarks:
+
+* ``base64_small``, ``base64_large``: Standard Base64 encoding and decoding
+* ``urlsafe_base64_small``: URL-safe Base64 (small only, as URLs shouldn't
+  contain huge data)
+* ``base32_small``, ``base32_large``: Base32 encoding and decoding
+* ``base16_small``, ``base16_large``: Base16/hex encoding and decoding
+* ``ascii85_small``, ``ascii85_large``: Ascii85 encoding and decoding
+  (includes ``wrapcol=76`` code path)
+* ``base85_small``, ``base85_large``: Base85 encoding and decoding
+
+See the `base64 module <https://docs.python.org/dev/library/base64.html>`_.
+
+
 chameleon
 ---------
 

diff --git a/doc/changelog.rst b/doc/changelog.rst
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+Version 1.14.0
+--------------
+* Add base64 module benchmark (b64, b32, b16, a85, b85)
+
 Version 1.13.0 (2025-10-27)
 --------------
 * Re-enable xdsl benchmark

diff --git a/doc/conf.py b/doc/conf.py
@@ -55,7 +55,7 @@
 # built documents.
 #
 # The short X.Y version.
-version = release = "1.0.6"
+version = release = "1.14.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

diff --git a/pyperformance/__init__.py b/pyperformance/__init__.py
@@ -3,7 +3,7 @@
 import sys
 from importlib.metadata import distribution
 
-VERSION = (1, 13, 0)
+VERSION = (1, 14, 0)
 __version__ = ".".join(map(str, VERSION))
 
 

diff --git a/pyperformance/data-files/benchmarks/MANIFEST b/pyperformance/data-files/benchmarks/MANIFEST
@@ -24,6 +24,7 @@ async_tree_eager_memoization_tg	<local:async_tree>
 asyncio_tcp	<local>
 asyncio_tcp_ssl	<local:asyncio_tcp>
 asyncio_websockets	<local>
+base64	<local>
 bpe_tokeniser	<local>
 concurrent_imap	<local>
 coroutines	<local>

diff --git a/pyperformance/data-files/benchmarks/bm_base64/pyproject.toml b/pyperformance/data-files/benchmarks/bm_base64/pyproject.toml
@@ -0,0 +1,10 @@
+[project]
+name = "pyperformance_bm_base64"
+requires-python = ">=3.8"
+dependencies = ["pyperf"]
+urls = {repository = "https://github.com/python/pyperformance"}
+dynamic = ["version"]
+
+[tool.pyperformance]
+name = "base64"
+tags = "serialize"
diff --git a/pyperformance/data-files/benchmarks/bm_base64/run_benchmark.py b/pyperformance/data-files/benchmarks/bm_base64/run_benchmark.py
@@ -0,0 +1,277 @@
+"""Benchmark for the base64 module's primary public APIs.
+
+Tests encoding and decoding performance across various variants
+and data sizes, split into _small (balanced small data) and _large variants.
+
+Small weighs towards measuring overhead, large measures the core algorithm
+loop implementation.
+"""
+
+import base64
+import random
+import pyperf
+
+
+# Generate test data with a fixed seed for reproducibility
+random.seed(12345)
+DATA_TINY = random.randbytes(20)
+DATA_SMALL = random.randbytes(127)  # odd on purpose
+DATA_MEDIUM = random.randbytes(3072)
+DATA_9K = random.randbytes(9000)
+DATA_LARGE = random.randbytes(102400)
+DATA_HUGE = random.randbytes(1048574)  # 1M-2
+
+# Pre-encoded data for decode benchmarks
+B64_TINY = base64.b64encode(DATA_TINY)
+B64_SMALL = base64.b64encode(DATA_SMALL)
+B64_MEDIUM = base64.b64encode(DATA_MEDIUM)
+B64_9K_STR = base64.b64encode(DATA_9K).decode('ascii')
+B64_LARGE = base64.b64encode(DATA_LARGE)
+B64_HUGE = base64.b64encode(DATA_HUGE)
+
+B64_URLSAFE_TINY = base64.urlsafe_b64encode(DATA_TINY)
+B64_URLSAFE_SMALL = base64.urlsafe_b64encode(DATA_SMALL)
+B64_URLSAFE_MEDIUM = base64.urlsafe_b64encode(DATA_MEDIUM)
+B64_URLSAFE_9K_STR = base64.urlsafe_b64encode(DATA_9K).decode('ascii')
+
+B32_TINY = base64.b32encode(DATA_TINY)
+B32_SMALL = base64.b32encode(DATA_SMALL)
+B32_MEDIUM = base64.b32encode(DATA_MEDIUM)
+B32_9K_STR = base64.b32encode(DATA_9K).decode('ascii')
+B32_LARGE = base64.b32encode(DATA_LARGE)
+B32_HUGE = base64.b32encode(DATA_HUGE)
+
+B16_TINY = base64.b16encode(DATA_TINY)
+B16_SMALL = base64.b16encode(DATA_SMALL)
+B16_MEDIUM = base64.b16encode(DATA_MEDIUM)
+B16_9K_STR = base64.b16encode(DATA_9K).decode('ascii')
+B16_LARGE = base64.b16encode(DATA_LARGE)
+B16_HUGE = base64.b16encode(DATA_HUGE)
+
+A85_TINY = base64.a85encode(DATA_TINY)
+A85_SMALL = base64.a85encode(DATA_SMALL)
+A85_MEDIUM = base64.a85encode(DATA_MEDIUM)
+A85_9K_STR = base64.a85encode(DATA_9K).decode('ascii')
+A85_LARGE = base64.a85encode(DATA_LARGE)
+A85_HUGE = base64.a85encode(DATA_HUGE)
+
+B85_TINY = base64.b85encode(DATA_TINY)
+B85_SMALL = base64.b85encode(DATA_SMALL)
+B85_MEDIUM = base64.b85encode(DATA_MEDIUM)
+B85_9K_STR = base64.b85encode(DATA_9K).decode('ascii')
+B85_LARGE = base64.b85encode(DATA_LARGE)
+B85_HUGE = base64.b85encode(DATA_HUGE)
+
+
+# --- Base64 ---
+
+def bench_b64_small(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(450):
+            base64.b64encode(DATA_TINY)
+            base64.b64decode(B64_TINY)
+        for _ in range(71):
+            base64.b64encode(DATA_SMALL)
+            base64.b64decode(B64_SMALL)
+        for _ in range(3):
+            base64.b64encode(DATA_MEDIUM)
+            base64.b64decode(B64_MEDIUM)
+        base64.b64encode(DATA_9K)
+        base64.b64decode(B64_9K_STR)
+    return pyperf.perf_counter() - t0
+
+
+def bench_b64_large(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(10):
+            base64.b64encode(DATA_LARGE)
+            base64.b64decode(B64_LARGE)
+        base64.b64encode(DATA_HUGE)
+        base64.b64decode(B64_HUGE)
+    return pyperf.perf_counter() - t0
+
+
+# --- URL-safe Base64 (small only) ---
+
+def bench_urlsafe_b64_small(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(450):
+            base64.urlsafe_b64encode(DATA_TINY)
+            base64.urlsafe_b64decode(B64_URLSAFE_TINY)
+        for _ in range(71):
+            base64.urlsafe_b64encode(DATA_SMALL)
+            base64.urlsafe_b64decode(B64_URLSAFE_SMALL)
+        for _ in range(3):
+            base64.urlsafe_b64encode(DATA_MEDIUM)
+            base64.urlsafe_b64decode(B64_URLSAFE_MEDIUM)
+        base64.urlsafe_b64encode(DATA_9K)
+        base64.urlsafe_b64decode(B64_URLSAFE_9K_STR)
+    return pyperf.perf_counter() - t0
+
+
+# --- Base32 ---
+
+def bench_b32_small(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(450):
+            base64.b32encode(DATA_TINY)
+            base64.b32decode(B32_TINY)
+        for _ in range(71):
+            base64.b32encode(DATA_SMALL)
+            base64.b32decode(B32_SMALL)
+        for _ in range(3):
+            base64.b32encode(DATA_MEDIUM)
+            base64.b32decode(B32_MEDIUM)
+        base64.b32encode(DATA_9K)
+        base64.b32decode(B32_9K_STR)
+    return pyperf.perf_counter() - t0
+
+
+def bench_b32_large(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(10):
+            base64.b32encode(DATA_LARGE)
+            base64.b32decode(B32_LARGE)
+        base64.b32encode(DATA_HUGE)
+        base64.b32decode(B32_HUGE)
+    return pyperf.perf_counter() - t0
+
+
+# --- Base16 ---
+
+def bench_b16_small(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(450):
+            base64.b16encode(DATA_TINY)
+            base64.b16decode(B16_TINY)
+        for _ in range(71):
+            base64.b16encode(DATA_SMALL)
+            base64.b16decode(B16_SMALL)
+        for _ in range(3):
+            base64.b16encode(DATA_MEDIUM)
+            base64.b16decode(B16_MEDIUM)
+        base64.b16encode(DATA_9K)
+        base64.b16decode(B16_9K_STR)
+    return pyperf.perf_counter() - t0
+
+
+def bench_b16_large(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(10):
+            base64.b16encode(DATA_LARGE)
+            base64.b16decode(B16_LARGE)
+        base64.b16encode(DATA_HUGE)
+        base64.b16decode(B16_HUGE)
+    return pyperf.perf_counter() - t0
+
+
+# --- Ascii85 (includes wrapcol=76) ---
+
+def bench_a85_small(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(450):
+            base64.a85encode(DATA_TINY)
+            base64.a85encode(DATA_TINY, wrapcol=76)
+            base64.a85decode(A85_TINY)
+            base64.a85decode(A85_TINY)  # balance enc+dec weight
+        for _ in range(71):
+            base64.a85encode(DATA_SMALL)
+            base64.a85encode(DATA_SMALL, wrapcol=76)
+            base64.a85decode(A85_SMALL)
+            base64.a85decode(A85_SMALL)  # balance enc+dec weight
+        for _ in range(3):
+            base64.a85encode(DATA_MEDIUM)
+            base64.a85encode(DATA_MEDIUM, wrapcol=76)
+            base64.a85decode(A85_MEDIUM)
+            base64.a85decode(A85_MEDIUM)  # balance enc+dec weight
+        base64.a85encode(DATA_9K)
+        base64.a85encode(DATA_9K, wrapcol=76)
+        base64.a85decode(A85_9K_STR)
+        base64.a85decode(A85_9K_STR)  # balance enc+dec weight
+    return pyperf.perf_counter() - t0
+
+
+def bench_a85_large(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(10):
+            base64.a85encode(DATA_LARGE)
+            base64.a85encode(DATA_LARGE, wrapcol=76)
+            base64.a85decode(A85_LARGE)
+            base64.a85decode(A85_LARGE)  # balance enc+dec weight
+        base64.a85encode(DATA_HUGE)
+        base64.a85encode(DATA_HUGE, wrapcol=76)
+        base64.a85decode(A85_HUGE)
+        base64.a85decode(A85_HUGE)  # balance enc+dec weight
+    return pyperf.perf_counter() - t0
+
+
+# --- Base85 ---
+
+def bench_b85_small(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(450):
+            base64.b85encode(DATA_TINY)
+            base64.b85decode(B85_TINY)
+        for _ in range(71):
+            base64.b85encode(DATA_SMALL)
+            base64.b85decode(B85_SMALL)
+        for _ in range(3):
+            base64.b85encode(DATA_MEDIUM)
+            base64.b85decode(B85_MEDIUM)
+        base64.b85encode(DATA_9K)
+        base64.b85decode(B85_9K_STR)
+    return pyperf.perf_counter() - t0
+
+
+def bench_b85_large(loops):
+    range_it = range(loops)
+    t0 = pyperf.perf_counter()
+    for _ in range_it:
+        for _ in range(10):
+            base64.b85encode(DATA_LARGE)
+            base64.b85decode(B85_LARGE)
+        base64.b85encode(DATA_HUGE)
+        base64.b85decode(B85_HUGE)
+    return pyperf.perf_counter() - t0
+
+
+if __name__ == "__main__":
+    runner = pyperf.Runner()
+    runner.metadata['description'] = "Benchmark base64 module encoding/decoding"
+
+    runner.bench_time_func('base64_small', bench_b64_small)
+    runner.bench_time_func('base64_large', bench_b64_large)
+
+    runner.bench_time_func('urlsafe_base64_small', bench_urlsafe_b64_small)
+
+    runner.bench_time_func('base32_small', bench_b32_small)
+    runner.bench_time_func('base32_large', bench_b32_large)
+
+    runner.bench_time_func('base16_small', bench_b16_small)
+    runner.bench_time_func('base16_large', bench_b16_large)
+
+    runner.bench_time_func('ascii85_small', bench_a85_small)
+    runner.bench_time_func('ascii85_large', bench_a85_large)
+
+    runner.bench_time_func('base85_small', bench_b85_small)
+    runner.bench_time_func('base85_large', bench_b85_large)