SearXNG : Core Philosophy, Key Features, Advantages, and How to Use Public & Private Instances
TL;DR
SearXNG is a powerful privacy-centric metasearch engine that brings together results from many search services while actively protecting your personal data.
What Is SearXNG?
SearXNG is a free and open-source metasearch engine that aggregates results from many different search services while not tracking, storing, or profiling users. It was created as the successor to the original Searx project, continuing its philosophy of privacy and decentralization.
Feature | Details |
|---|---|
Type | Metasearch engine (doesn’t crawl/index by itself) |
License | GNU Affero General Public License (AGPL-3.0) |
Codebase | Python (with web interface in HTML/CSS) |
Runs on | Linux, macOS, FreeBSD, and other Unix-like systems |
Offered as | Public instances or self-hosted servers |
Released | March 27, 2021 |
Website & Docs | docs.searxng.org and public instance listings at searx.space |
How It Works
SearXNG does not function like traditional search engines that crawl and index web pages itself. Instead:
You enter a search query in the SearXNG interface.
SearXNG sends that query to multiple configured search engines (e.g., Google, Bing, DuckDuckGo, Qwant) simultaneously.
It aggregates, deduplicates, and cleans up the results before showing them to you.
At no point does SearXNG store or log personal queries or user IP addresses.
This aggregation means you often get broader and less biased results than you would from any single engine.
Strong Privacy & Anonymity
Privacy is the core philosophy of SearXNG:
Feature | Description |
|---|---|
No Tracking | SearXNG does not log search queries, IP addresses, cookies, or user data. |
Opaque to Upstream Engines | Requests to search engines remove private data before being sent. |
No Profiling | No personalization or ad-targeting based on user activity. |
Optional Tor Support | Searches can be routed through Tor for additional anonymity. |
Encrypted Connections (HTTPS) | All traffic is encrypted to ensure security and privacy. |
Core Philosophy and Privacy
SearXNG’s primary goal is to provide search results without compromising user privacy. Unlike mainstream search engines that track queries, it implements a “zero-tracking” policy.
No User Tracking: It does not store or share search queries, and by default, it disables all tracking cookies.
IP Protection: All search requests are routed through the SearXNG instance, which hides your real IP address from the external search engines it queries .
Result Sanitization: The engine actively removes tracking parameters from the URLs of search results before presenting them to you.
Forced Encryption: It strongly encourages the use of HTTPS to encrypt the connection between you and the instance, ensuring your search activity cannot be easily intercepted
Key Features and Customization
SearXNG offers a highly customizable search experience that puts you in control.
Powerful Search Syntax: You can refine your searches with special commands directly in the search box .
Use ! to search specific engines or categories (e.g., !wp paris to search Wikipedia, or !images car for an image search).
Use : to select a language filter (e.g., :fr !wp Wau Holland).
It supports external bangs from DuckDuckGo with !! to search other sites directly (e.g., !!wfr Wau Holland).
Extensive Filtering Options: You can filter searches by time (day, week, month, year), language, and safe search level to fine-tune your results.
Multiple Categories: Search across different categories like general web, images, videos, news, and maps, often with the ability to select multiple categories at once.
Customizable Interface: You can change the theme, including a dark mode, and adjust the layout to your liking. You can even set results to open in a new tab by default.
Special Queries: It includes built-in tools for tasks like generating a random UUID, calculating averages, or hashing text (e.g., md5 lorem ipsum).
Technology and Architecture
SearXNG is built on a modular and extensible architecture.
Metasearch Framework: It acts as an aggregator, sending your query to multiple search engines simultaneously and merging the results. This is powered by a plugin-like system of engine adapters for each external service.
Performance Focus: To ensure fast searches, it uses asynchronous requests to query engines in parallel. It can also be configured with a caching system like Redis to store popular queries and reduce load.
Flexible API: It provides a RESTful API, allowing developers to integrate its search capabilities into other applications or tools.
How to Get Started with SearXNG
You have two main options for using SearXNG: use an existing public instance or run your own.
Use a Public Instance: This is the easiest way to try it out. You can find a list of publicly available instances on the SearXNG project website. You can even set one as your browser’s default search engine.
Run Your Own Instance: For maximum privacy and control, you can self-host SearXNG. This is surprisingly accessible thanks to its official Docker image.
Docker Deployment (Recommended): The quickest method is using Docker. After installing Docker, you can run a container with a simple command :
bash
docker run --name searxng -d -p 8888:8080 docker.io/searxng/searxng:latest
You would then access your new instance at http://localhost:8888.
Other Deployment Options: You can also install SearXNG directly on a Linux server (like Ubuntu) with or without Docker. For Windows users who prefer not to use a virtual machine or WSL, community projects offer adapted versions that run natively.
Search Capabilities
Metasearch Engine Aggregation
SearXNG can query hundreds of separate search engines, including:
Standard web search sources
Images, videos, and news aggregators
Specialized sources (scientific, social media, music, files, etc.)
Multiple language and country variations
Some instances support up to around 247 search engines, with many enabled by default.
Search Categories
Users can choose to search within different categories, such as:
General web, Images, Videos, News, Social Media, Files, Science & academia, Maps and more
This categorization helps narrow results to specific content types.
Customization & Control
Self-Hosting
You can run your own SearXNG instance on a server, local machine, or cloud provider. This gives full control over:
Which engines are queried
UI themes and languages
Request handling and privacy settings
Maximum anonymity without relying on public instances
Self-hosting is popular among privacy-focused individuals and organizations.
User Preferences
Even on public instances, users can customize:
Search categories and engines
Language filters
Themes and appearance
Default search engine settings (via OpenSearch)
Architecture & UI
Built on Flask, a lightweight Python web framework.
UI renders server-side HTML with progressive enhancement so core search works without heavy JavaScript.
Multiple themes, responsive design, and custom icon systems for different result types.
There’s a clear separation between request handling, engine loading, query orchestration, and result formatting.
Advantages
Privacy-first search — no tracking or profiling.
Aggregated results from many sources gives broader insights.
Open Source & Transparent — code is open for audit and contributions.
Self-hostable & customizable for users and organizations.
Supports Tor for enhanced anonymity
Considerations (Limitations)
Public instance reliability can vary — they’re run by volunteers.
Self-hosting requires technical knowledge (Docker, server setup).
Advanced search operators & deep query features may be limited compared to Google/Bing.
Results may sometimes differ in quality or relevance, especially for non-English queries depending on engine configurations. (community feedback)
Use Cases
Typical use cases include:
Privacy-first web searching
Custom search portals for companies or communities
Integration with workflows or AI tools
Educational and research purposes
Comparative search results across sources
Public & Private Instances
Public instances: Everyone can use them like a typical search engine.
Private/self-hosted instances: Only you or your organization uses them — best for maximum privacy.
A list of public instances is maintained at searx.space.
Community & Development
SearXNG is actively developed by a community of contributors.
Code and issue tracking hosted on GitHub.
There are regular updates, plugins, and community-driven enhancements.
