libpresign¶

High-performance library for generating AWS S3 presigned URLs.

160x Faster

Generate presigned URLs 160x faster than boto3 with our optimized C++ implementation

Performance benchmarks
Secure & Compatible

Fully compatible with AWS S3 signature version 4, supporting all regions and custom endpoints

API reference
Easy to Use

Drop-in replacement for boto3's presigned URL generation with a simple Python API

Quick start
Cross-Platform

Pre-built wheels for Linux, macOS, and Windows across Python 3.8-3.13

Installation

Why libpresign?¶

When you need to generate thousands of S3 presigned URLs quickly, boto3's performance can become a bottleneck. libpresign solves this by implementing the AWS signature version 4 algorithm in optimized C++ while maintaining full compatibility with S3.

Key Features¶

Blazing Fast: 5-15x faster in real-world usage, up to 160x faster in benchmarks
Memory Efficient: Minimal memory overhead (~262 bytes per URL)
Thread Safe: Generate URLs concurrently without locks
Zero Dependencies: No runtime Python dependencies required
Type Safe: Full type hints and mypy support
Well Tested: 100% test coverage with comprehensive test suite

Quick Example¶

import libpresign

# Generate a presigned URL
url = libpresign.get(
    access_key_id="AKIAIOSFODNN7EXAMPLE",
    secret_access_key="wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY",
    region="us-east-1",
    bucket="my-bucket",
    key="path/to/file.jpg",
    expires=3600  # 1 hour
)

print(url)
# https://my-bucket.s3.us-east-1.amazonaws.com/path/to/file.jpg?X-Amz-Algorithm=...

Performance Comparison¶

Here's how libpresign compares to boto3 for generating presigned URLs:

Operation	libpresign	boto3	Speedup
Single URL	6 μs	102 μs	17x
1000 URLs	6 ms	102 ms	17x
Memory per URL	262 bytes	1.6 KB	6x less

View detailed benchmarks →

Use Cases¶

libpresign is ideal for applications that need to:

Generate presigned URLs in bulk for large datasets
Serve presigned URLs with minimal latency
Process high-throughput S3 operations
Run in resource-constrained environments
Scale presigned URL generation horizontally

Getting Started¶

Install with pip
```
pip install libpresign
```
Install with uv
```
uv add libpresign
```

Ready to speed up your S3 presigned URL generation? Get started →

License¶

libpresign is released under the MIT License. See the LICENSE file for details.