ScreenshotCoreScreenshotCore

Custom Injection

Inject custom CSS or JavaScript into the page before the screenshot is taken.

Use custom_css to override styles (hide elements, change fonts, force colours) and custom_js to run arbitrary JavaScript (close modals, scroll, manipulate the DOM). Both are applied before capture. Maximum 10 000 characters each.

Parameters

NameTypeRequiredDescription
custom_cssstringoptionalCSS injected into the page before capture. Max 10 000 characters.
custom_jsstringoptionalJavaScript executed before capture. Max 10 000 characters.

Code Examples

# Force dark background via CSS injection
curl -X POST "https://screenshotcore.com/api/v1/screenshot" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com","custom_css":"body{background:#111!important;color:#eee!important}"}' \
  -o dark.png

# Remove a modal via JS before capture
curl -X POST "https://screenshotcore.com/api/v1/screenshot" \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com","custom_js":"document.querySelector(\".modal\")?.remove()"}' \
  -o clean.png

Response

(Raw PNG bytes with custom CSS/JS applied, Content-Type: image/png)
Element InteractionDisplay Emulation