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Rendering demos

Five tasks for capturing pages as PDF, PNG, MHTML, and emulated device views.

pdf

Render a page to PDF via Chrome's print engine.

curl -s -X POST localhost:8765/tasks/rendering/pdf -d '{}'
curl -s -X POST localhost:8765/tasks/rendering/pdf \
  -d '{"url":"https://news.ycombinator.com","path":"/tmp/hn.pdf"}'

task "rendering/pdf"
    pool default
    timeout 20000
    transport rest
    input url  string default "https://example.com"
    input path string default "/tmp/webtasks-demo/example.pdf"

    goto "{{url}}"
    wait until "body" timeout 10000
    pdf doc path "{{path}}" format A4 printBackground true
end

Returns both a server-side file at path and base64 in data.doc.

Concepts: pdf action, printBackground, dual output (path + as).

snapshot

MHTML snapshot — single-file archive of the page with resources inlined.

curl -s -X POST localhost:8765/tasks/rendering/snapshot -d '{}'

Concepts: snapshot action, archival capture, offline viewing.

fullpage-shot

Full-page screenshot (entire scrollable document, not just viewport).

curl -s -X POST localhost:8765/tasks/rendering/fullpage-shot -d '{}'

Compare with Basics → screenshot (viewport only).

Concepts: screenshot with full-page mode, large PNG output.

html-to-pdf

Render arbitrary HTML string to PDF without navigating to a URL.

curl -s -X POST localhost:8765/tasks/rendering/html-to-pdf -d '{}'

Concepts: html-to-pdf, generating reports from templates server-side.

emulate-dark

Emulate dark-mode / device preferences before capture.

curl -s -X POST localhost:8765/tasks/rendering/emulate-dark -d '{}'

Concepts: device emulation, prefers-color-scheme, pre-capture setup.

Capture comparison

Action Output Best for
screenshot PNG (base64) Quick visual check
pdf PDF file Reports, printing
snapshot MHTML Archival, legal hold
html-to-pdf PDF from string Generated documents

Full params: Actions → rendering

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