Reference
Every error, documented.
Each API error carries a doc_url pointing to one of these pages.
400validation_errorMalformed body or an invalid option value./errors/validation_error →401authentication_errorMissing, malformed, or revoked API key./errors/authentication_error →402quota_exceededOut of included renders and overage is off./errors/quota_exceeded →403plan_restrictedFeature not available on your plan./errors/plan_restricted →404not_foundRequested route or page was not found./errors/not_found →409conflictA resource with that name or idempotency key already exists./errors/conflict →413document_too_largeDocument exceeds your plan limit./errors/document_too_large →415unsupported_media_typeRequest Content-Type is not accepted by this endpoint./errors/unsupported_media_type →422url_blockedTarget URL could not be fetched safely./errors/url_blocked →429rate_limitedToo many requests./errors/rate_limited →500internal_errorSomething failed on our side./errors/internal_error →500render_failedThe render engine could not produce the PDF — crashing HTML, a browser timeout, or a broken external resource./errors/render_failed →503service_unavailableService is saturated or under maintenance./errors/service_unavailable →