Better DeepSeek

Better DeepSeek is a browser extension that enhances the DeepSeek chat interface with a powerful set of tools, persistent memory, and a customizable system prompt. It enables DeepSeek to generate files, run code, create presentations, and manage complex projects directly within the conversation, all while keeping your data local and private.

"Better DeepSeek" is an unofficial, independent, and community-driven open-source extension. It is NOT affiliated with, endorsed by, sponsored by, or officially connected to DeepSeek or DeepSeek AI in any way. All product names, logos, and brands are property of their respective owners.

Features

Hidden System Prompt

Inject a custom system prompt that guides DeepSeek's behavior without cluttering the chat. The prompt is automatically injected into every conversation and can be edited from the extension's settings panel.

Tool Tags for Enhanced Output

Better DeepSeek introduces a set of special tags that DeepSeek can use to produce rich, interactive content:

• <BDS:HTML>...</BDS:HTML> – Render a full HTML document in a preview card.
• <BDS:VISUALIZER>...</BDS:VISUALIZER> – Create high-contrast, monochrome simulations and interactive diagrams using a built-in UI kit.
• <BDS:run_python_embed>...</BDS:run_python_embed> – Execute Python code in the browser (via Pyodide) and display the output.
• <BDS:create_file fileName="path/to/file.ext">...</BDS:create_file> – Generate a downloadable file with the specified name and content.
• <BDS:pptx>...</BDS:pptx> – Generate a PowerPoint presentation using the PptxGenJS library.
• <BDS:excel>...</BDS:excel> – Generate an Excel spreadsheet using SheetJS.
• <BDS:docx>...</BDS:docx> – Generate a Word document using the docx library.
• <BDS:AUTO:REQUEST_WEB_FETCH>url</BDS:AUTO:REQUEST_WEB_FETCH> – Automatically fetch and convert a web page to markdown, then inject it into the chat context.
• <BDS:memory_write>key: value, importance: always|called</BDS:memory_write> – Store persistent facts about the user that are injected into future prompts.
• <BDS:character_create name="..." usage="...">...</BDS:character_create> – Define a roleplay persona that DeepSeek can adopt.

LONG_WORK Project Mode

When building multi-file projects, DeepSeek can use the <BDS:LONG_WORK> tag. All files created inside this block are collected, zipped, and presented as a single download after the block closes. During generation, the user sees only a "Working..." indicator, keeping the chat clean.

Persistent Memory and Skills

• Memory: Store key-value facts about the user. "Always" memories are included in every request; "called" memories appear only when their key is mentioned.
• Skills: Upload markdown files that define custom instructions or behaviors. Skills can be toggled on and off from the drawer.
• Characters: Create and manage roleplay personas. Only one character can be active at a time.

Voice Support (STT & TTS)

Better DeepSeek now supports full voice interaction:

• Voice-to-Text: Dictate your prompts using the microphone button next to the chat input. Supports optional auto-submission for a hands-free experience.
• Text-to-Speech: Assistant responses can be automatically read aloud once generation is complete.
• Language Selection: Configure your preferred voice and recognition language directly from the extension settings.

Native Navigation

The DeepSeek logo and "New Chat" button have been transformed into native links, allowing for standard browser interactions such as "Open in New Tab" via right-click or Ctrl/Cmd+Click.

User Interface

A sleek drawer slides out from a floating button on the DeepSeek page. Inside you can:

• Edit the system prompt.
• Toggle auto-download behavior for files and LONG_WORK zips.
• Import, export, and manage skills.
• Import, export, and manage memory entries.
• Create, edit, and activate characters.

Code Block Download Buttons

Every code block in DeepSeek responses gains a "Download" button, making it easy to save snippets with the correct file extension.

Advanced File Upload

The extension adds a "+" button next to the chat input, offering:

• Upload a folder (concatenates all text files into a single workspace file).
• Import a GitHub repository (fetches and packages the repo as a text file).
• Fetch a web page (converts the main content to markdown).

Installation

Recommended: Chrome Web Store

The easiest way to install Better DeepSeek is through the Chrome Web Store. This ensures you receive automatic updates.

Latest Development Build

If you want to try the very latest features before they reach the store, you can download the Latest Automated Build. Download the ZIP, unzip it, and load it via "Load unpacked" in Chrome.

Manual Installation (Developer Mode)

If you prefer to build from source or contribute to development:

Prerequisites

• Node.js (version 18 or later)
• npm

Build from Source

1. Clone the repository:

   git clone https://github.com/EdgeTypE/better-deepseek.git
   cd better-deepseek
   

2. Install dependencies:

   npm install
   

3. Build the extension:

   npm run build
   

   This will create a dist folder with the unpacked extension.
4. Load the extension in Chrome:
   • Open Chrome and navigate to chrome://extensions.
   • Enable "Developer mode" (toggle in the top right).
   • Click "Load unpacked" and select the dist folder.

The extension should now appear in your extensions list and be active on chat.deepseek.com.

Usage

Once installed, visit chat.deepseek.com. You will see a "BDS" button in the top-right corner. Click it to open the settings drawer.

Using Tool Tags

Simply ask DeepSeek to perform a task that would benefit from one of the tools. For example:

• "Create a Python script that calculates the Fibonacci sequence and run it."
• "Make an interactive pendulum simulation."
• "Generate a PowerPoint presentation about climate change."
• "Build a complete React to-do app as a downloadable project."

DeepSeek will use the appropriate tags automatically (guided by the injected system prompt).

Managing Memory

When DeepSeek writes to memory using <BDS:memory_write>, the entries appear in the "Stored Memory" section of the drawer. You can also manually import/export memory as JSON.

Uploading Folders and GitHub Repos

Click the "+" button next to the chat input to reveal the advanced upload menu. Choose "Upload Folder" to select a local directory; the extension will concatenate all text files into a single upload. "GitHub Repo" fetches the repository as a ZIP and converts it to a gitingest-style text file for context.

Development

Project Structure

better-deepseek/
├── src/
│   ├── background/       # Service worker for cross-origin requests
│   ├── content/          # Content script (runs on DeepSeek page)
│   │   ├── dom/          # DOM manipulation utilities
│   │   ├── files/        # File/folder/GitHub readers and code block downloads
│   │   ├── parser/       # BDS tag parsing and sanitization
│   │   ├── tools/        # Tool card renderers (HTML, Python, PPTX, etc.)
│   │   ├── ui/           # Svelte components for the drawer and overlays
│   │   └── index.js      # Content script entry point
│   ├── injected/         # Script injected into the page's MAIN world
│   ├── lib/              # Shared utilities (ZIP, download, hashing, etc.)
│   ├── sandbox/          # Sandboxed iframe for PPTX/Excel/DOCX generation
│   └── styles/           # CSS files
├── static/
│   ├── manifest.json     # Extension manifest
│   └── sandbox.html      # Sandbox page
├── scripts/              # Build helper scripts
├── build.js              # Vite build configuration
└── package.json

Building and Watching

• npm run build – Production build.
• npm run dev – Development build with watch mode.

After making changes, rebuild the extension and reload it from chrome://extensions (click the refresh icon on the extension card).

Design Principles

• The content script uses Svelte 5 for reactive UI components.
• The injected script patches window.fetch and XMLHttpRequest to modify outgoing chat completion requests.
• All data (settings, skills, memories, characters) is stored locally using chrome.storage.local.
• The extension is designed to be non-intrusive: it only modifies the DOM by adding host containers next to messages and hiding original markdown when tool tags are present.

Privacy

Better DeepSeek does not collect, transmit, or sell any personal data. All settings, memories, skills, and characters are stored locally on your device. The extension only communicates with DeepSeek's official API and the external services you explicitly request (e.g., GitHub for repository fetching). See the full Privacy Policy for details.

Changelog

v0.1.1 (2026-04-18)

• New Feature: Added full Voice Support (Speech-to-Text and Text-to-Speech).
• New Feature: Configurable voice and recognition languages in Settings.
• UX Improvement: Logo and "New Chat" button are now real <a> tags, supporting "Open in new tab".
• Improved Reliability: Better handling of stalled streams and automatic closing of tags.

Contributing

Contributions are welcome! Please open an issue or submit a pull request on GitHub. Before submitting a PR, ensure that your code builds without errors and follows the existing style.

Acknowledgements and Disclaimer

Use it at your own risk. Better DeepSeek is an independent project and is not affiliated with DeepSeek. It uses several open-source libraries, including:

• Svelte
• PptxGenJS
• SheetJS
• docx
• fflate
• Readability
• Turndown

"Better DeepSeek" is an unofficial, independent, and community-driven open-source extension. It is NOT affiliated with, endorsed by, sponsored by, or officially connected to DeepSeek or DeepSeek AI in any way. All product names, logos, and brands are property of their respective owners.