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Code Screenshot Generator ​

DifficultyBeginner
Team SizeSolo
Time~20-25 hours
Demo-ready byStep 4
PrerequisitesHTML, CSS, JavaScript
Built byCarbon, Ray.so, Chalk.ist, Silicon

Skills you'll earn: Syntax highlighting, Canvas API, image export, theming systems, clipboard API

Start with syntax highlighting. End with beautiful, shareable code images.

(Assumes starting from scratch with basic HTML/CSS/JS knowledge)

Step 1: Highlight code in the browser (~2 hours) ​

You have a code snippet. You want it to look like it does in your editor.

  • One HTML page with a <textarea> for input and a <div> for output
  • Use a syntax highlighting library (Prism.js or Highlight.js)
  • Detect the language or let the user pick from a dropdown
  • Render the highlighted code in real time

You now have: A browser-based syntax highlighter.

Step 2: Make it look like an editor window (~2 hours) ​

Highlighted code in a div doesn't look shareable. You want that macOS-window aesthetic.

  • Wrap the code block in a styled container with a title bar
  • Add the three colored dots (close, minimize, maximize)
  • Add padding, border-radius, and a background color behind the window
  • Let the user set a filename in the title bar

You now have: A code block that looks like a screenshot of an editor.

Step 3: Export as an image (~2-3 hours) ​

You can see it in the browser, but you can't paste it into a tweet.

  • Use html2canvas or the dom-to-image library to capture the styled div as a PNG
  • Add a "Download" button
  • Make sure the exported image has proper resolution (2x for retina)

You now have: Downloadable code screenshots.

Step 4: Theming (~2-3 hours) ​

Your friend likes dark mode. Your professor wants light mode.

  • Build a theme system with multiple color schemes (Dracula, One Dark, Solarized, GitHub Light)
  • Store themes as CSS custom property sets
  • Let the user switch themes from a dropdown
  • Also let them change the background gradient behind the window

You now have: Customizable themes.

Step 5: Customization controls (~2-3 hours) ​

Users want to tweak font size, padding, and window style.

  • Add controls for: font size, font family, line height, padding, border radius
  • Add toggle for line numbers
  • Add toggle for window shadow
  • Store preferences in localStorage

You now have: A fully configurable screenshot tool.

Step 6: Move it to a server (~3-4 hours) ​

You want to generate screenshots programmatically — for docs, for CI, for bots.

  • Build a Node.js API endpoint that accepts code, language, and theme
  • Use Puppeteer to render the styled HTML and capture a screenshot server-side
  • Return the image as a PNG response
  • Support query parameters for all customization options

You now have: A screenshot API.

Step 7: Copy to clipboard (~1 hour) ​

Downloading and then uploading is two steps too many.

  • Add a "Copy to clipboard" button using the Clipboard API
  • Copy the image blob directly (not a URL)
  • Show a brief confirmation when copied
  • Encode the code, language, and settings into a URL (base64 or URL params)
  • Opening the link reconstructs the exact screenshot
  • Add an Open Graph image so the link preview shows the code screenshot

Step 9: Deploy (~2-3 hours) ​

  • Containerize the frontend and the screenshot API
  • Deploy behind a CDN for the static frontend
  • Rate-limit the API to prevent abuse
  • Add CI/CD

Useful Resources ​

Where to go from here ​

  • VS Code extension that sends selected code to your service
  • CLI tool for generating screenshots from the terminal
  • Animated code screenshots (typing effect, line-by-line reveal)
  • Diff view — highlight changes between two snippets
  • Watermarks and branding options