---
id: nanopb
version: "0.4.9.1"
license: Zlib
license_treatment: permissive
maintenance: active
---

# nanopb — Nanopb is a small code-size Protocol Buffers implementation in ansi C. It is especially suitable for use in microcontrollers, but fits any memory restricted system.

License: permissive · Maintenance: active · Downloads: 422.6K/mo

## What it is and what it does

Nanopb is a Protocol Buffer compiler and runtime library designed for embedded systems and memory-constrained devices. It takes standard .proto files and generates minimal C code (pb_encode.c, pb_decode.c, pb_common.c) that can be compiled into your project. Unlike the full protobuf library, nanopb prioritizes small code size and low memory footprint, making it suitable for microcontrollers and other resource-limited environments.

The package provides a Python-based code generator that runs on your development machine to produce the C headers and source files from your .proto definitions. It integrates with common build systems (Make, CMake, SCons, Bazel, Conan) and platforms (Arduino, Zephyr, PlatformIO). The generated code depends only on protobuf as a runtime dependency for the generator itself, while the compiled C output has minimal external dependencies, making it ideal for bare-metal or deeply embedded applications.

Use it for:

- Generate compact C serialization code for IoT devices and microcontroller firmware that need to exchange structured data over limited bandwidth or storage.
- Build embedded systems that communicate with cloud services using Protocol Buffers without the overhead of a full protobuf runtime library.
- Integrate Protocol Buffer message definitions into Arduino or STM32 projects where code size and memory are critical constraints.
- Create firmware for devices running on Zephyr RTOS or other embedded operating systems that require efficient message serialization.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Nanopb is a code generator and runtime library that compiles Protocol Buffer definitions into minimal C code suitable for embedded systems and memory-constrained environments.

Yes, if you are building embedded C/C++ systems that need Protocol Buffer serialization. The active maintenance, permissive license, and wide integration with embedded platforms make it a solid choice. Install only if you have a C build system in place and need to generate code from .proto files; this is a build-time tool, not a runtime library for Python applications.

## Install

pip install nanopb
uv add nanopb
poetry add nanopb

## Installing nanopb

Before you install: Low install friction with a single runtime dependency on protobuf. The package is actively maintained with a recent release and 5520 repository stars, indicating stable community adoption.

License in practice: Licensed under Zlib (permissive), allowing use in commercial and proprietary projects with minimal restrictions.

Quickstart:

pip install nanopb

# Generate C code from a .proto file
python -m nanopb.generator myprotocol.proto

# Or use the generator directly
from nanopb import generator
# Integrate with your build system to compile .pb.c and .pb.h files

Requires protobuf as a runtime dependency; C compiler and build system (Make, CMake, SCons, or Bazel) needed to compile the generated .pb.c and .pb.h files into your embedded project.

Verify before relying:

- Whether the PyPI package includes precompiled generator binaries or requires Python to run the generator
- Performance characteristics or code-size benchmarks compared to other embedded protobuf implementations
- Support status for Protocol Buffer versions beyond the current release cycle

## Package facts

- License: Zlib (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 422.6K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

protobuf code generator embedded, protocol buffers microcontroller, protoc minimal C implementation, small footprint serialization, embedded protobuf compiler, memory-efficient protobuf, nanopb generator tool, embedded-systems, code-generation, protobuf

[View on SkillFed](https://skillfed.io/packages/nanopb) · [View on PyPI](https://pypi.org/project/nanopb/)