The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Short answer: Zed edits your HTML and CSS, while the documented screenshot workflow uses the HTML/CSS to Image (HCTI) remote MCP server. In Zed’s Agent Panel, connect that MCP service, then ask it either to capture a public URL or to render HTML/CSS files as a PNG. A public URL must be reachable by the hosted renderer; a local file path or localhost address alone is not enough for that service.
What Zed does—and what HCTI does
Zed is the editor and agent interface. Its HTML extension supplies language support, and its CSS support provides editing help. Zed’s HTML documentation describes Prettier as the default formatter, with manual formatting available from Cmd+Shift+I on macOS or Ctrl+Shift+I on Linux and Windows. The command palette (Cmd+Shift+P or Ctrl+Shift+P) is a way to find Agent Panel and other actions if your layout or key bindings differ.
The documented image output comes from HCTI’s remote MCP integration, not from a built-in Zed browser renderer. HCTI exposes operations such as create_image for supplied HTML/CSS, create_url_image for a public page or CSS selector, create_templated_image for saved templates, and create_batch_images for variations. Tool names and options can change, so verify the current HCTI documentation when configuring a new connection.
Before you start
- Install a current Zed release and open the project containing your HTML and CSS.
- Have access to HCTI’s remote MCP integration and its current setup instructions. This article does not assume a particular settings JSON or connection-button sequence because those fields are service-version dependent.
- For URL capture, use a public URL that the hosted renderer can reach. Authentication-only intranet pages, localhost, and private network addresses will not work as a substitute for a publicly reachable target.
- For source rendering, keep the HTML and CSS available to attach as Agent Panel context. If the markup references local images, fonts, or scripts, be prepared to make those dependencies self-contained.
Capture a public webpage from Zed
This path is for an existing website. The HCTI guide’s example requests a PNG at a 1,440-pixel viewport and device scale 1; those are useful starting values, not universal requirements.
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- Open Agent Panel. Use the panel action in Zed, or find it through the command palette if your current key binding is different.
- Make sure the HCTI remote MCP server is available. Follow HCTI’s current connection instructions and confirm that its HTML/CSS-to-image tools appear to the agent.
- Send an explicit capture prompt. Replace the sample address with your target URL:
Use HTML/CSS to Image to screenshot https://example.com as a PNG. Set viewport_width to 1440 and device_scale to 1. Return the image URL. - Inspect the returned URL. Open the hosted image and check that the page loaded at the expected breakpoint, that fonts and images are present, and that no consent overlay obscures the content.
- Repeat with adjusted parameters. Change the viewport, device scale, output format, or selector in a follow-up request rather than editing the site merely to obtain a different crop.
Useful capture variations
- Element only: ask for a CSS selector when you need a component rather than the whole page.
- Different formats: request PNG, JPG, WebP, or PDF where supported by the current HCTI tool.
- Responsive checks: run the same URL at several viewport widths and compare the returned images.
- Batch work: use the documented batch operation for URL variations instead of sending many nearly identical prompts.
Render HTML and CSS files as an image
Use this path for a design that exists in your project rather than on a deployed website. Attach the relevant files to Agent Panel context and ask HCTI to render them. The service’s hosted renderer cannot infer your computer’s filesystem from a path or a localhost URL alone.
- Open the source. Include the HTML file and every CSS file that contributes to the design in the Agent Panel context.
- Ask the agent to make the document self-contained. This means resolving relative stylesheets, replacing unavailable local references, and preserving the intended dimensions and fonts where possible.
- Request a PNG render. A practical prompt is:
Read the attached HTML and CSS. Make the markup self-contained, render it as a PNG with HCTI at device_scale 1, and return the image URL. - Review the image URL. Look for missing assets, unexpected default fonts, overflow, and transparent areas that were meant to have a background.
- Iterate in the source. Make one focused change at a time—text, color, spacing, or dimensions—then request another render so you can identify which edit changed the result.
A small first render
For a predictable first pass, use explicit text, colors, and dimensions instead of relying on browser defaults. HCTI’s example uses a 1,200 × 630 card with centered text; treat that as an illustration, not a required social-image size. A minimal document can look like this:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
html, body { margin: 0; width: 1200px; height: 630px; }
body { display: grid; place-items: center; background: #111827; color: #fff; font: 700 56px/1.1 system-ui, sans-serif; }
.card { padding: 64px; text-align: center; }
</style>
</head>
<body><div class="card">A render from Zed</div></body>
</html>Paste the complete markup in the request or attach it as a file. If external fonts, images, or scripts are essential, explain which ones the renderer must load and provide publicly reachable URLs when the service requires them.
Choosing the right workflow
| Question | Public-page capture | Source rendering |
|---|---|---|
| Input | A publicly reachable URL | HTML/CSS supplied in Agent Panel context |
| Typical output | A snapshot of the page or selected element | A preview of the design you are editing |
| Main controls | Viewport, device scale, format, selector | Self-contained markup, dimensions, styles, assets |
| Local files required? | No | Yes, attached to the prompt; a path alone is insufficient |
| Best use | Regression checks, documentation, social previews | Design iteration before deployment |
Make Zed a better authoring environment
Use Zed’s HTML and CSS language features to catch errors before asking for a render. HTML support comes from Zed’s automatically installed HTML extension. Prettier is the documented default HTML formatter, and you can invoke formatting from the command palette or the manual-format shortcut.
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For CSS, Zed documents standard CSS support and optional Tailwind-specific completion, diagnostics, and hover previews. Tailwind IntelliSense requires configuring the Tailwind CSS language server for CSS and disabling the default CSS language server, as described in Zed’s CSS documentation. These tools improve editing and validation; they do not themselves produce the screenshot.
Common failures and fixes
The agent cannot see an image tool
Cause: the remote MCP connection is missing, disabled, or configured with outdated fields. Fix: revisit HCTI’s current MCP setup instructions, reconnect, and confirm that the image tools are listed in Agent Panel before retrying.
The result is blank or only partly loaded
Cause: the URL is private, the page depends on blocked resources, or the capture occurred before content finished loading. Fix: use a public URL, remove authentication-only dependencies, and ask for an appropriate wait or loading condition if the current HCTI tool supports it.
Local CSS or images are missing
Cause: the hosted renderer cannot read your local filesystem. Fix: attach the source files, make the HTML self-contained, and replace local-only asset references with embedded data or reachable URLs.
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Cause: the requested viewport or fixed document dimensions do not match the design. Fix: set explicit width and height, choose a viewport that contains the content, and request a full-page or element capture when that is the intended result.
Fonts look different
Cause: a local font is unavailable to the hosted service or the page falls back to another family. Fix: use a broadly available stack or provide a font that the renderer can reach, then render again.
A second request returns an old image
Cause: an intermediate cache may be serving the prior result. Fix: alter the source or request parameters enough to create a new render, and check the service’s current caching controls.
Performance, reliability, and cost considerations
For quick visual iteration, keep the first render small and deterministic: inline critical CSS, avoid unnecessary third-party scripts, and use device scale 1 until the layout is correct. Increase scale only when you need denser output; it increases the amount of image data to generate and inspect. For many pages, batch operations can reduce repetitive prompting, but validate one representative page first.
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A hosted renderer also means your result depends on network reachability and the target page’s own loading behavior. Record the URL, viewport, device scale, and source revision with each render if the image is part of a review or regression process. HCTI’s guide documents the workflow and returned image URL; it does not establish a universal timing, uptime, or pixel-identical guarantee.
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It also offers an MCP server for Claude, Cursor, and other MCP clients, with take_screenshot, get_page_info, and capture_pdf tools. The API supports full-page and CSS-selector captures, dark mode, device presets or custom viewports, retina scale, PDF controls, custom CSS and JavaScript, clicks, waits, blocking rules, headers, cookies, user agents, authorization, timezone and geolocation, transparent backgrounds, resizing, TTL caching, signed links, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, a usage API, and an OpenAPI specification.
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FAQ
Can Zed render a localhost URL directly?
Not through the documented HCTI hosted workflow. Attach the HTML and CSS and ask the agent to make the markup self-contained, or publish the page at a reachable URL.
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Is 1,440 pixels the required viewport?
No. It is the HCTI guide’s example value. Choose the viewport that matches the device, design, or comparison you need.
Does Zed’s formatter create screenshots?
No. Formatting and language-server features help author HTML and CSS; HCTI supplies the documented image rendering step.
Frequently Asked Questions
Can I capture a private staging site with the HCTI workflow?
Only if the hosted renderer can reach it and authenticate as required; a machine-local address by itself is not sufficient.
Which output should I choose for a design review?
PNG is a practical default for crisp UI details. Use JPG or WebP when smaller files matter, and PDF when the deliverable is a paginated document.
Quick Recap
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