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The quickest local conversion is IMGKit with wkhtmltoimage: pass an HTML string to IMGKit.new, call to_img(:jpeg), and write the returned bytes to a file. For pages that depend on current Chrome CSS, web fonts, or JavaScript, use Grover (Puppeteer/Chromium) instead. A managed Chrome API such as html2img removes browser packaging. The right choice depends on rendering fidelity, deployment constraints, privacy, and how much output control you need.
Choose the rendering path first
| Approach | Rendering engine | Best fit | Deployment and access | Important trade-off |
|---|---|---|---|---|
| IMGKit + wkhtmltoimage | WebKit-based wkhtmltoimage | Simple local HTML/CSS conversion | Ruby gem plus a wkhtmltoimage binary | Its browser behavior can differ from current Chrome, especially for modern CSS and JavaScript |
| Grover | Google Puppeteer/Chromium | Chrome-level layout, JavaScript, and web-font rendering | Ruby gem with Chromium/Puppeteer packaging | More browser runtime and deployment work |
| html2img Ruby client | Managed real Chrome | Hosted rendering without packaging Chromium | API key and network access; the gem has zero runtime dependencies | HTML is sent to a service and usage is governed by the account allowance |
There are no independent speed or image-quality benchmarks in the available documentation, so treat these as architectural differences rather than performance rankings.
Option 1: Convert HTML with IMGKit and wkhtmltoimage
IMGKit describes itself as creating JPGs from “plain old HTML+CSS.” It supports JPEG, JPG, and PNG output and can render an HTML string, URL, or file. The following example writes a JPEG directly.
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Install the gem and renderer
- Add
imgkitto your Gemfile and runbundle install, or install it withgem install imgkit. - Install the
wkhtmltoimageexecutable on the host, or add thewkhtmltoimage-binarygem as your project’s packaging method. - Verify that the binary is available to the process that runs Ruby.
If the executable is not on the normal PATH, configure its location explicitly:
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IMGKit.configure do |config|
config.wkhtmltoimage = "/opt/wkhtmltox/bin/wkhtmltoimage"
endRender an HTML string to JPEG bytes
require "imgkit"
html = <<~HTML
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
body { margin: 0; font-family: Arial, sans-serif; background: #f4f6f8; }
.card { width: 800px; padding: 32px; background: white; color: #18212b; }
h1 { margin-top: 0; }
</style>
</head>
<body>
<main class="card">
<h1>Ruby HTML capture</h1>
<p>This document is rendered locally.</p>
</main>
</body>
</html>
HTML
kit = IMGKit.new(html, quality: 50)
image_blob = kit.to_img(:jpeg)
File.binwrite("output.jpg", image_blob)
# The convenience method writes the file itself:
kit.to_file("output-2.jpg")quality: 50 is an example setting, not a universal optimum. Test the quality that preserves your text and images at the intended display size. IMGKit also accepts a URL or local file when the content is not generated as a string.
When IMGKit is the right choice
- Your HTML uses broadly supported CSS and does not depend on current browser APIs.
- You want a self-contained, local pipeline and can install a system binary.
- Your input is trusted or you have an explicit policy for loading remote resources.
If a page looks different from Chrome, that is a rendering-engine limitation rather than a JPEG-writing error. Move to a Chromium-based option when fidelity matters more than the smaller setup.
Option 2: Use Grover for Chromium rendering
Grover’s RubyGems description is “Transform HTML into PDF/PNG/JPEG using Google Puppeteer/Chromium.” It is the better fit when the result depends on current Chrome CSS behavior, JavaScript execution, or web fonts. Grover 1.2.4 was published on November 4, 2025 and requires Ruby >= 3.0.0, < 3.5.0; check those constraints against your deployed Ruby version before adopting it.
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- Add the
grovergem to your Gemfile and runbundle install. - Install or make available the Chromium/Puppeteer runtime required by your Grover installation.
- Render your HTML through Grover and select JPEG output using the version’s documented API.
A minimal application pattern is:
require "grover"
html = <<~HTML
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>body { margin: 0; font-family: system-ui, sans-serif; }</style>
</head>
<body><h1>Chromium-rendered HTML</h1></body>
</html>
HTML
# Grover's release-specific API should be checked in its documentation.
# The resulting JPEG bytes can then be written with File.binwrite.
image = Grover.new(html).to_jpeg
File.binwrite("output.jpg", image)Confirm the exact constructor and output method for the Grover version locked in your bundle; browser wrappers can change option names between releases. The key decision is the Chromium engine, not a particular JPEG quality number.
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Why Chromium can fix a WebKit mismatch
- Modern CSS layout can follow the same engine family used by your users’ Chrome browsers.
- Client-side JavaScript can run before capture, allowing the page to build its final DOM.
- Web fonts can be loaded by the browser rather than approximated by a different renderer.
Chromium also increases operational surface area: the executable must be present, launch permissions must be correct, and a server process needs enough memory and time for browser startup and page loading.
Option 3: Render through the html2img Ruby client
The html2img client documentation says every render runs in real Chrome. Its HTML endpoint accepts a complete document and returns an image URL, while the Ruby gem has zero runtime dependencies. This is useful when you prefer a hosted browser over installing wkhtmltoimage or Chromium in each deployment environment.
Account and security requirements
- An API key is required.
- The documentation states that each account starts with 50 free credits.
- Free-tier renders are hosted for seven days.
- Keep the key on your server; do not embed it in browser-delivered JavaScript or public HTML.
Because the endpoint returns an image URL, your application must decide whether to download the image immediately, store it, or pass the URL to another service. Review the provider’s current client documentation for the exact Ruby method names and endpoint parameters before pinning an implementation.
JPEG output: quality, dimensions, and transparency
JPEG is a lossy format. It is commonly useful for photographic content or compact full-page captures. PNG is usually the safer choice for crisp text edges, flat interface colors, or transparency; both IMGKit and Grover document PNG alongside JPEG. No authoritative benchmark establishes a universal file-size or quality advantage, so compare representative pages from your own workload.
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Control the input before conversion
- Set an explicit viewport or content width in the renderer so responsive breakpoints are deterministic.
- Use print-safe CSS only when your selected renderer applies it as expected.
- Wait for remote fonts and images before capturing; otherwise the screenshot can contain fallback fonts or empty image boxes.
- Keep a stable HTML snapshot for reproducible output. Dynamic timestamps, advertisements, and animations can change pixels between runs.
Neither JPEG nor PNG can repair a page that was captured before its JavaScript finished building the content. Rendering readiness belongs in the browser configuration or in the page itself.
Ruby implementation checklist
- Define the source. Decide whether Ruby receives a complete HTML string, reads a file, or navigates to a URL.
- Choose the engine. Select IMGKit for a simple WebKit pipeline, Grover for Chromium fidelity, or html2img for managed Chrome.
- Make dependencies explicit. Package the binary or browser runtime in deployment documentation and verify it in the same user account that runs the job.
- Make rendering deterministic. Set dimensions, include required CSS, and wait for assets and JavaScript.
- Write binary data correctly. Use
File.binwriteor open the destination with binary mode; do not treat JPEG bytes as UTF-8 text. - Validate the result. Check that the file exists, has a nonzero size, and opens as an image before publishing it.
- Protect untrusted input. A renderer that can fetch URLs or execute JavaScript should run with a least-privilege account and an egress policy appropriate to your application.
Or skip the browser setup
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The API supports full-page captures with lazy images loaded, CSS-selector element captures, dark mode, device presets or custom viewports, retina scale, custom CSS and JavaScript, click-before-capture actions, waits for selectors, delays or network idle, request and resource blocking, headers, cookies, user agents, Authorization, timezone, geolocation, transparent backgrounds, resizing, chosen cache TTLs, signed links, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, a usage API, and an OpenAPI specification. Existing parameter names used by other screenshot APIs also work, easing migration.
Ruby call
require "net/http"
require "uri"
uri = URI("https://api.screenshotneo.com/v1/shot")
uri.query = URI.encode_www_form(
access_key: "YOUR_API_KEY",
url: "https://stripe.com"
)
response = Net::HTTP.get_response(uri)
raise "Screenshot failed: #{response.code}" unless response.is_a?(Net::HTTPSuccess)
File.binwrite("shot.webp", response.body)See the ScreenshotNeo documentation for parameters and response headers. The same request in cURL is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
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Troubleshooting Ruby HTML-to-JPEG jobs
“No wkhtmltoimage executable found”
The gem is installed but the binary is missing or not on PATH. Install wkhtmltoimage, use the binary gem, or set IMGKit.configure to the absolute executable path. Test under the same service account used in production.
The JPEG is blank or only partly rendered
Check that the source URL is reachable from the rendering host and that the page does not require a blocked login, cookie, or network resource. For JavaScript-heavy pages, use a Chromium path and wait for the page’s final state before capture.
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This usually indicates an engine or font-loading difference. Compare IMGKit’s WebKit output with Grover’s Chromium output, embed or reliably serve the required fonts, and fix the viewport so responsive CSS selects the intended breakpoint.
The Ruby process cannot launch Chromium
Check Ruby compatibility, executable permissions, sandbox policy, and the browser runtime installation. Keep the Grover version and browser setup aligned in the deployment image rather than relying on an untracked system installation.
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The output file is corrupt
Write the response in binary mode and inspect the HTTP status before saving it. With a hosted API, an error response may be HTML or JSON rather than image bytes; do not save it as .jpg without checking.
Which option should you use?
- Use IMGKit when local execution and a straightforward HTML/CSS feature set matter most.
- Use Grover when current Chrome behavior, JavaScript, or web fonts determine correctness and you can operate Chromium.
- Use html2img when a managed real-Chrome service is acceptable and you want a Ruby client without runtime dependencies.
- Use ScreenshotNeo when you want a single API call, consent and popup cleanup, usage-aware billing, and an MCP route for AI agents.
Frequently Asked Questions
Can Ruby convert a local HTML file directly?
Yes. IMGKit can load a file as its input, or you can read the file into a Ruby string and pass that string to IMGKit.new before calling to_img(:jpeg).
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It depends on the renderer. A WebKit-based IMGKit pipeline may not match a current browser, while Chromium-based Grover and managed Chrome services are intended for browser-rendered pages; configure an explicit readiness condition for dynamic content.
Should I keep the intermediate image bytes in memory?
For small images, returning bytes and using File.binwrite is simple. For large or concurrent jobs, stream or store results according to your application’s memory and retention limits.
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