Code Screenshot Generator

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What This Tool Does

Code screenshots are everywhere: Twitter threads, blog posts, slide decks, README files. Plain text pastes don't carry syntax highlighting or visual context. This tool turns a code snippet into a PNG image with proper highlighting, a configurable background, and optional window chrome (the red/yellow/green dots).

It works like Carbon or Ray.so, but runs entirely in your browser. Your code stays on your machine.

Customization Options

Editor Themes

The tool ships with several syntax themes ported from popular editors:

• Night Owl — dark blue, designed for readability in low light
• Dracula — high-contrast purple/pink, widely used
• Nord — muted arctic tones, easy on the eyes for long sessions
• Monokai — the classic warm theme from Sublime Text
• VS Code Dark — the default dark theme from VS Code

Each theme uses Prism.js tokenization, so highlighting accuracy depends on how well Prism supports your language. TypeScript, JavaScript, Python, Rust, Go, and HTML/CSS work well. Niche languages may have partial highlighting.

Backgrounds

Choose from solid colors, gradients (like a fuchsia-to-indigo "Hyper" or a teal "Oceanic"), or a frosted glass effect with backdrop blur. There's also a plain black option if you want the code to be the only visual element.

Layout Controls

• Padding — adjustable whitespace around the code window (more padding = better for social media, less = better for documentation)
• Window controls — toggle macOS-style traffic light dots on/off
• Font size — 12px to 24px, affects both the preview and the exported image
• Line numbers — show or hide

Export

Images export at 2x resolution using html2canvas. This means a 400px-wide preview produces an 800px-wide PNG, which looks sharp on Retina/HiDPI displays and stays legible when social media platforms compress the image.

Tips for Better Code Screenshots

Keep snippets short. 5-15 lines work best for social media. If you need to show more, consider splitting into multiple images or linking to a Gist.

Pick the right theme for the context. High-contrast themes like Dracula or Hyper backgrounds catch attention in Twitter feeds. Subdued themes like Nord or Deep Space work better in technical blog posts where the code needs to blend with surrounding text.

Check readability before exporting. Some theme + background combinations look great in the preview but lose contrast when platforms add their own compression. The "Glass" background in particular can be hard to read with light-colored themes.

Use comments in the code itself to add context. A well-placed // This is the important part inside the snippet often communicates better than surrounding text in the post.

How html2canvas Works (and Its Limits)

The export uses html2canvas, which renders the DOM node to a <canvas> element and converts it to a PNG. It's not a real browser renderer — it re-implements CSS layout in JavaScript. This means:

• Most CSS properties work (backgrounds, borders, fonts, shadows)
• CSS backdrop-filter (used by the Glass theme) may not render perfectly in the export even though it looks fine in the live preview
• Very long code blocks can hit canvas size limits in some browsers (Safari caps at 16,384px height)

If the export fails or looks wrong, try reducing your code length or switching to a simpler background.

Language Support

The tool uses Prism.js for tokenization. Supported languages include: TypeScript, JavaScript, JSX/TSX, Python, Rust, Go, Java, C/C++, HTML, CSS, SQL, Bash, JSON, YAML, and Markdown. The language selector determines which grammar Prism applies — picking the wrong language won't break anything, but keywords won't highlight correctly.

Frequently Asked Questions

Can I use the generated images commercially? Yes. The images are rendered locally from your own code. There's no license restriction.

Why does my export look different from the preview? html2canvas doesn't support every CSS feature. Backdrop blur and certain gradients may render differently. The 2x scaling can also shift subpixel alignment slightly.

Is there a line limit? No hard limit, but images taller than ~16,000px may fail in Safari due to canvas restrictions. For best results, keep snippets under 50 lines.

Can I change the font? The tool uses a system monospace stack (JetBrains Mono, Fira Code, Menlo, Consolas as fallbacks). Custom font uploads aren't supported currently.

How do I remove the window title bar? Clear the title text field in the settings panel. The traffic light dots can be toggled separately.

My code has sensitive data. Is it uploaded? No. Everything happens in the browser. The code never leaves your device.

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