How does git lfs work

Content on WhatAnswers is provided "as is" for informational purposes. While we strive for accuracy, we make no guarantees. Content is AI-assisted and should not be used as professional advice.

Last updated: April 8, 2026

Quick Answer: Git LFS (Large File Storage) is a Git extension that replaces large files with text pointers in the repository while storing the actual file content on a remote server. It was developed by GitHub and released in 2015 to address Git's inefficiency with binary files over 100 MB. Git LFS uses a client-server architecture where the Git repository contains only pointer files, and the large files are managed separately through HTTP or SSH protocols.

Key Facts

Git LFS was released by GitHub in 2015
Git LFS replaces files over 100 MB with text pointers
Git LFS uses a client-server architecture with separate file storage
Git LFS supports HTTP and SSH protocols for file transfer
Git LFS is open-source software under the MIT license

Overview

Git LFS (Large File Storage) is an open-source extension for Git that solves the problem of versioning large files in Git repositories. Developed by GitHub and first released in 2015, Git LFS addresses Git's fundamental limitation with binary files - Git stores every version of every file in its history, making repositories with large files slow to clone and bloated in size. Before Git LFS, developers faced practical limits around 100 MB per file, with GitHub imposing hard limits that made working with media files, datasets, binaries, and other large assets problematic. The solution emerged from GitHub's own experience with repositories containing game assets, design files, and scientific data that exceeded Git's efficient handling capabilities. Git LFS is maintained as an open-source project with contributions from multiple organizations and is licensed under the MIT license.

How It Works

Git LFS works by replacing large files in your repository with tiny text pointers while storing the actual file content on a separate server. When you add a large file to a Git LFS-tracked repository, Git LFS intercepts the file and replaces it with a pointer file containing metadata about the original file. This pointer includes the file's original name, size, and a unique object identifier (OID). The actual file content gets uploaded to a Git LFS server (which can be GitHub, GitLab, Bitbucket, or a self-hosted server). When you clone or checkout the repository, Git LFS downloads the pointer files first, then automatically retrieves the actual file content from the LFS server as needed. The system uses HTTP or SSH protocols for transferring the large files, and it supports resumable uploads and downloads. Configuration is done through a .gitattributes file that specifies which file patterns should be handled by Git LFS.

Why It Matters

Git LFS matters because it enables version control for projects that work with large binary files while maintaining Git's workflow efficiency. Without Git LFS, repositories with large assets become impractical - cloning takes hours, storage requirements balloon, and network transfers become prohibitively slow. Git LFS has become essential for game development (storing 3D models and textures), data science (managing large datasets), multimedia projects (handling video and audio files), and engineering (versioning CAD files). It allows teams to maintain the benefits of Git's branching, merging, and collaboration features while working with files that would otherwise break Git's performance. Major platforms like GitHub, GitLab, and Bitbucket have integrated Git LFS support, making it a standard solution for large file management in version control.