A lightweight, self-hosted memo hub. Open Source and Free forever.

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Steven 8f29db2f49 fix(server): prevent memory exhaustion in thumbnail generation Address high memory usage when opening resource tab (fixes #5183) by implementing: 1. Concurrency control: Limit thumbnail generation to 3 concurrent operations using semaphore to prevent memory exhaustion when many images are requested simultaneously 2. S3 optimization: Skip server-side thumbnail generation for S3-stored images by default. S3 images now use presigned URLs directly, avoiding: - Downloading large images from S3 into server memory - Decoding and resizing images on the server - High memory consumption during batch requests 3. Memory management improvements: - Explicitly clear blob and decoded image from memory after use - Restructure thumbnail cache check to avoid unnecessary semaphore acquisition - Double-check pattern to prevent duplicate generation while waiting This restores the original S3 behavior before commit `e4f6345` while maintaining thumbnail support for local/database storage. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>		7 months ago
.github	chore: add Claude Code GitHub workflow (#5227 )	7 months ago
cmd/memos	refactor: remove unused constants	8 months ago
internal	chore: bump version	8 months ago
plugin	feat(store): add hierarchical tag filtering support	8 months ago
proto	refactor: rename workspace to instance throughout codebase	7 months ago
scripts	refactor: rename workspace to instance throughout codebase	7 months ago
server	fix(server): prevent memory exhaustion in thumbnail generation	7 months ago
store	fix(security): implement security review recommendations (#5228 )	7 months ago
web	refactor(web): use Radix Checkbox and remove memoTypeStats	7 months ago
.dockerignore	chore: update resource dialog style (#982 )	3 years ago
.gitignore	refactor: remove unused constants	8 months ago
.golangci.yaml	chore: update golangci config	1 year ago
.goreleaser.yaml	refactor: remove unused constants	8 months ago
CLAUDE.md	refactor: rename workspace to instance throughout codebase	7 months ago
CODEOWNERS	chore: update readme (#1047 )	3 years ago
LICENSE	chore: update LICENSE (#4394 )	1 year ago
README.md	chore: update readme	8 months ago
SECURITY.md	chore: update security	3 years ago
go.mod	fix(server): prevent memory exhaustion in thumbnail generation	7 months ago
go.sum	refactor: update markdown parser	8 months ago

README.md

Memos

An open-source, self-hosted note-taking service. Your thoughts, your data, your control — no tracking, no ads, no subscription fees.

💎 Featured Sponsors

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Overview

Memos is a privacy-first, self-hosted knowledge base that works seamlessly for personal notes, team wikis, and knowledge management. Built with Go and React, it offers lightning-fast performance without compromising on features or usability.

Why choose Memos over cloud services?

Feature	Memos	Cloud Services
Privacy	✅ Self-hosted, zero telemetry	❌ Your data on their servers
Cost	✅ Free forever, MIT license	❌ Subscription fees
Performance	✅ Instant load, no latency	⚠️ Depends on internet
Ownership	✅ Full control & export	❌ Vendor lock-in
API Access	✅ Full REST + gRPC APIs	⚠️ Limited or paid
Customization	✅ Open source, forkable	❌ Closed ecosystem

Features

🔒 Privacy-First Architecture
- Self-hosted on your infrastructure with zero telemetry
- Complete data ownership and export capabilities
- No tracking, no ads, no vendor lock-in
📝 Markdown Native
- Full markdown support
- Plain text storage — take your data anywhere
⚡ Blazing Fast
- Built with Go backend and React frontend
- Optimized for performance at any scale
🐳 Simple Deployment
- One-line Docker installation
- Supports SQLite, MySQL, and PostgreSQL
🔗 Developer-Friendly
- Full REST and gRPC APIs
- Easy integration with existing workflows
🎨 Beautiful Interface
- Clean, minimal design and dark mode support
- Mobile-responsive layout

Quick Start

Docker (Recommended)

docker run -d \
  --name memos \
  -p 5230:5230 \
  -v ~/.memos:/var/opt/memos \
  neosmemo/memos:stable

Open http://localhost:5230 and start writing!

Try the Live Demo

Don't want to install yet? Try our live demo first!

Other Installation Methods

Docker Compose - Recommended for production deployments
Pre-built Binaries - Available for Linux, macOS, and Windows
Kubernetes - Helm charts and manifests available
Build from Source - For development and customization

See our installation guide for detailed instructions.

Contributing

We welcome contributions of all kinds! Whether you're fixing bugs, adding features, improving documentation, or helping with translations — every contribution matters.

Ways to contribute:

Star History

License

Memos is open-source software licensed under the MIT License.

Website • Documentation • Demo • Discord • X/Twitter

Made with ❤️ by the Memos community