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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesTo turn a Rails invoice into a downloadable PDF, render its HTML template with render_to_string, pass the resulting HTML to a PDF renderer, and send the returned bytes with a PDF content type and filename. Grover uses Puppeteer and Chromium; Wicked PDF and PDFKit use wkhtmltopdf. The right choice depends on your app’s runtime and the invoice’s CSS, JavaScript, and asset requirements.
Choose a renderer for your invoice
| Option | Rendering engine | Best fit and considerations |
|---|---|---|
| Grover | Puppeteer and Chromium | A candidate when the invoice relies on browser behavior or modern web styling. Deployment must include the required Node.js/Puppeteer/Chromium runtime. Its README documents Rails template rendering with render_to_string. Grover documentation |
| Wicked PDF | wkhtmltopdf, invoked as a shell utility | Offers Rails controller integration and methods to render a string or save bytes. The README lists Ruby 2.2–3.2 and Rails 4–7.0 as verified; check the exact gem release before relying on those compatibility statements. Wicked PDF documentation |
| PDFKit | wkhtmltopdf | A Ruby wrapper with HTML conversion and Rails/Rack middleware options. Its README lists Ruby 2.5–3.1 and Rails 4.2, 5.2, and 6.0–7.0 as supported; confirm those claims against the release you choose. PDFKit documentation |
These project documents do not provide a controlled performance comparison or a direct feature test across all three libraries. Do not choose based on an assumed speed advantage: test your invoice’s layout, assets, and deployment environment with the renderer you plan to run.
Build a Rails invoice PDF with Grover
Install the Ruby gem and browser dependencies
Grover’s documented setup uses the grover gem and Puppeteer’s npm package. Add the gem to your Gemfile and install it:
gem "grover"bundle installInstall the Puppeteer package using the package manager and lockfile workflow already used by your application. Your production environment must also be able to run the browser runtime; verify that Chromium can launch there rather than assuming a local development setup will behave the same way.
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Render the invoice template and return a PDF
Keep invoice markup in a dedicated Rails view so it can be reviewed and styled as HTML. For example, create app/views/invoices/show.pdf.erb or a dedicated HTML partial, and render it with the invoice record available to the template. A controller action can then render the HTML to a string and pass it to Grover:
class InvoicesController < ApplicationController
def download
@invoice = current_user.invoices.find(params[:id])
html = render_to_string(
template: "invoices/show",
formats: [:html],
layout: "invoice"
)
pdf = Grover.new(html).to_pdf
send_data pdf,
filename: "invoice-#{@invoice.id}.pdf",
type: "application/pdf",
disposition: "attachment"
end
endUse the authorization and record lookup appropriate to your application; the example scopes the invoice to the current user. Keep the view’s data requirements explicit so rendering it for a PDF does not depend on state that exists only during an ordinary browser request.
Make relative assets resolvable
When Grover receives HTML directly, relative paths need a base URL. Its README documents a display_url option; absent a configured display URL, its documented default is http://example.com. You can supply the application origin so paths resolve against the intended host:
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pdf = Grover.new(
html,
display_url: "https://app.example.com"
).to_pdfAlternatively, generate absolute asset URLs in the HTML. Ensure that the browser process can reach any URL it needs, including authenticated assets, and avoid depending on a developer-only hostname or credentials.
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Use Wicked PDF or PDFKit instead
Wicked PDF controller response
Wicked PDF integrates with Rails’ response formats. After installing the gem and the wkhtmltopdf executable, a controller can respond to a PDF request:
def download
@invoice = current_user.invoices.find(params[:id])
respond_to do |format|
format.pdf do
render pdf: "invoice-#{@invoice.id}",
template: "invoices/show.pdf.erb",
disposition: "attachment"
end
end
endUse the option names and template conventions supported by the exact Wicked PDF release in your application. The project README also documents rendering to a string and saving PDF bytes when a direct Rails response is not the right fit. Because wkhtmltopdf runs outside the Rails process, give it absolute references to stylesheets, JavaScript, and images that it must load. See the Wicked PDF README for installation and integration details.
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PDFKit conversion
PDFKit wraps wkhtmltopdf and documents creating a PDF from HTML, as well as Rails and Rack middleware setups. For raw HTML conversion, its README says to use complete file paths or URLs. It recommends hand-installing wkhtmltopdf and also points to a binary gem as an alternative. Check the instructions for the release and deployment platform you select: a Ruby wrapper alone does not ensure the external executable is installed. See PDFKit’s README.
Check print styling and invoice correctness
PDF generation is a print-rendering task, not simply a screenshot of the current browser viewport. Puppeteer’s Page.pdf documentation says PDF generation uses print media by default; if you need screen media styles instead, it directs users to emulate screen media before calling page.pdf(). Puppeteer Page.pdf API.
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- Use print CSS for page breaks, margins, colors, and elements that should not appear on paper.
- Test long descriptions, multiple line items, multi-page invoices, and totals near a page boundary.
- Check page size, orientation, currency and date formatting, Unicode characters, logos, and font loading.
- Verify the rendered PDF in the deployed environment with representative invoices; a successful local render does not establish that production assets or fonts are reachable.
Handle assets and deployment deliberately
All renderer choices need a reliable route to the invoice’s images and styles. With direct HTML input, relative URLs can resolve against an unexpected base; with wkhtmltopdf, the renderer runs separately from Rails and must be able to access the references. Decide whether assets will be absolute public URLs, local complete paths, or provided through the renderer’s documented configuration, then test that exact approach in production.
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Grover adds Puppeteer and Chromium to the runtime requirements. Wicked PDF and PDFKit require the wkhtmltopdf executable. These deployment dependencies affect packaging and operations; none of the cited project documents establishes a universal performance or resource-cost winner.
Protect the renderer from untrusted content
Do not treat arbitrary HTML or remote asset URLs as harmless just because the result is a PDF. Wicked PDF warns that user-provided page content can request internal IP addresses or hostnames, including cloud metadata endpoints. Sanitize untrusted markup and restrict the renderer’s network access to destinations it actually needs. Apply equivalent input and network controls to any renderer that loads URLs or resources on the server.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common PDF failures
- The app cannot find or launch the renderer: confirm the selected gem is installed and that the matching runtime is available in the deployed environment—Puppeteer/Chromium for Grover or the wkhtmltopdf executable for Wicked PDF and PDFKit.
- The PDF has missing CSS, images, or fonts: inspect the generated HTML for relative URLs, set Grover’s display URL or use absolute references, and confirm the renderer process can reach each asset.
- Styles differ from the web page: inspect print-specific CSS and test the PDF renderer directly. For Puppeteer, remember PDF generation uses print media by default unless screen media is explicitly emulated.
- Content is clipped or split awkwardly: reproduce with long descriptions and multi-page invoices, then adjust print CSS, page breaks, and page settings for that renderer.
- Rendering hangs or reaches internal services unexpectedly: review remote resources referenced by the HTML, impose appropriate execution and network boundaries, and do not allow untrusted invoice markup to fetch arbitrary destinations.
- A setup that worked locally fails after deployment: compare installed binary/browser versions, operating-system libraries, asset URLs, and runtime permissions between environments.
Or skip the browser setup
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Frequently Asked Questions
Does Rails itself convert an HTML view into a PDF?
No. Rails can render the view to HTML, but a separate renderer such as Grover, Wicked PDF, or PDFKit must produce the PDF bytes.
Can I use the same invoice template for browser display and PDF output?
Yes, but give it print styles and test pagination and asset loading in the chosen renderer; browser display alone does not guarantee identical PDF output.
Quick Recap
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