Html2Pdf.app vs Browserless for HTML-to-PDF automation

Direct answer: Html2Pdf.app is a focused HTML-to-PDF API with synchronous and callback-based workflows, and pricing tied to generated document size. Browserless offers PDF generation as one endpoint within a broader hosted browser automation platform, with cloud usage metered in browser-time units. Choose based on the rendering controls and surrounding browser tasks you need, your concurrency and data requirements, and the cost of representative jobs. Their published quotas use different units and are not directly comparable.

This guide compares documented capabilities; it does not report hands-on tests or benchmark results. Pricing and plan details below reflect the reviewed vendor pages at research time and may change. Check the linked pricing pages before committing.

At a glance

Question	Html2Pdf.app	Browserless
What is it?	A focused HTML-to-PDF conversion API.	A hosted browser platform whose REST APIs include PDF generation and other browser tasks.
Input	A publicly reachable URL or raw HTML.	A URL or raw HTML; the PDF endpoint accepts one or the other.
Typical workflow	Synchronous PDF response, or callback-based background generation.	PDF REST request returning a PDF response.
Usage unit	Credits based on generated file size: the homepage says each 5 MB chunk consumes one credit.	Browser connection time: one unit covers up to 30 seconds, with longer sessions using more units.
Broader browser tasks	Documentation centers on PDF conversion.	PDF sits alongside screenshot, scraping, rendered content, download, and browser automation APIs.

Sources: Html2Pdf.app documentation, Html2Pdf.app homepage, Browserless PDF API, Browserless REST API overview, and Browserless pricing.

When to choose each service

Choose Html2Pdf.app when

Your main requirement is converting URLs or supplied HTML into PDF documents.
You want a documented synchronous response or a callback workflow for background conversions.
A file-size-based credit model is a natural way to estimate your document workload.
The documented print, page, encryption, and permissions controls fit your use case.

Choose Browserless when

PDF generation is one part of a wider hosted browser workflow.
You may also need its documented screenshot, scraping, rendered-content, download, or browser-function APIs.
You want to account for usage by browser connection time and can estimate or measure how long your jobs occupy a browser.
You need the PDF endpoint’s documented print options and request/navigation controls.

These are workload-based recommendations, not claims that one service renders faster or more reliably. No comparative benchmark was established in the research for this article.

How the APIs work

Html2Pdf.app

The documented endpoint is POST https://api.html2pdf.app/v1/generate. Authenticate with the X-API-Key header. Send either a publicly reachable page URL or raw HTML using the documented request fields. A synchronous request returns PDF bytes. Supplying callBackUrl selects the documented background callback workflow. Consult the official documentation for the complete current schema, accepted option names, and callback payload.

Because the exact payload schema and option values can evolve, use the vendor’s current examples as the source of truth when adapting the snippets below. Do not assume a callback is an authenticated or signed webhook unless the current documentation says so; validate callback requests according to the vendor’s documented mechanism.

Browserless

The documented PDF API is POST /pdf. It accepts url or html, but not both, authenticates with a token query parameter, and returns application/pdf. The endpoint uses Puppeteer. See the PDF API documentation and OpenAPI reference for current request fields, response cases, and endpoint host appropriate to your account.

Runnable request patterns

Keep API keys and tokens in environment variables or a secret manager. These examples show the request shape; check each provider’s current documentation for exact required fields and account-specific endpoint host.

Html2Pdf.app: synchronous conversion

curl -X POST "https://api.html2pdf.app/v1/generate" \
  -H "X-API-Key: $HTML2PDF_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com/invoice/123"}' \
  --output invoice.pdf

The endpoint is documented to return PDF bytes for synchronous requests. The example demonstrates URL input; raw HTML can be supplied through the documented html field instead. Use the exact request schema from the current docs.

Html2Pdf.app: callback workflow

curl -X POST "https://api.html2pdf.app/v1/generate" \
  -H "X-API-Key: $HTML2PDF_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com/invoice/123","callBackUrl":"https://app.example.com/hooks/pdf-ready"}'

Implement a callback handler that records the job outcome and retrieves or processes the generated result using the response format documented by the provider. Make handlers idempotent: a repeated callback should not create duplicate invoices or downstream work. The example callback URL is illustrative; use a publicly reachable HTTPS endpoint you control.

Browserless: URL to PDF with cURL

curl -X POST "https://production-sfo.browserless.io/pdf?token=$BROWSERLESS_TOKEN" \
  -H "Content-Type: application/json" \
  --data '{"url":"https://example.com/invoice/123","options":{"format":"A4","printBackground":true}}' \
  --output invoice.pdf

Browserless documents the token query parameter and PDF response. Endpoint host and option nesting can vary with the current API configuration; verify the exact form in the official PDF API docs. The sample illustrates commonly documented print controls and should be adjusted to the documented schema for your endpoint.

Browserless: raw HTML

curl -X POST "https://production-sfo.browserless.io/pdf?token=$BROWSERLESS_TOKEN" \
  -H "Content-Type: application/json" \
  --data '{"html":"<!doctype html><html><body><h1>Invoice</h1><p>Example</p></body></html>","options":{"format":"A4"}}' \
  --output invoice.pdf

Send either url or html, not both, as specified by Browserless. Escape JSON correctly when constructing requests in application code.

Rendering controls and document quality

Both providers document print layout controls, but the precise option names and supported values should be confirmed in their live API docs before rollout.

Paper and layout: Html2Pdf.app describes page and print controls. Browserless documents paper format, margins, and orientation.
Backgrounds and repeated page furniture: Browserless documents background printing and headers and footers. Confirm the equivalent controls and supported templates in Html2Pdf.app’s schema if needed.
Fonts and external assets: Html2Pdf.app warns that output depends on available fonts and resources. Ensure fonts, images, and stylesheets are reachable to the rendering service, or include them in the supplied HTML when appropriate.
JavaScript: Html2Pdf.app warns that JavaScript load timing affects rendering. Pages that hydrate client-side need a reliable signal that the content is ready, where the service supports an appropriate wait control. Confirm available wait behavior in the current docs.
Page breaks: Set print CSS such as break-before, break-after, and break-inside in your source document, then inspect representative long and short documents. Browser rendering and content determine the final pagination.
Tagged output and accessibility: Browserless says Chrome tagged output can preserve structural information such as reading order and headings, depending on source markup. It is not certified PDF/UA. If formal conformance is required, validate generated PDFs with an appropriate accessibility workflow.

For either provider, test actual documents: a successful HTTP response does not prove that every chart, font, image, page break, or dynamic section rendered as intended.

Pricing and cost estimation

At the time represented by the research, Html2Pdf.app listed Free at $0/month with 100 credits and a 1 MB per-file limit; Startup at $9/month with 1,000 credits; Standard at $25/month with 5,000 credits; and Scale at $39/month with 10,000 credits. Its homepage says each 5 MB chunk of a generated document consumes one credit. Check the current pricing page because plans can change.

At research time, Browserless listed Free at $0/month with 1,000 units; Prototyping at $25/month with 20,000 units; Starter at $140/month with 180,000 units; and Scale at $350/month with 500,000 units. Displayed paid prices were billed annually. A unit is up to 30 seconds per browser connection; longer sessions use additional units. Confirm current terms on Browserless pricing.

Provider	Meter	What to measure in your pilot
Html2Pdf.app	Generated file size in credit increments	PDF size distribution, document limits, monthly volume, and parallel conversion needs
Browserless	Browser connection time in units	End-to-end render duration, slow or dynamic pages, retries, and concurrent sessions

Do not compare 1,000 credits with 1,000 units as though they buy the same amount of work. Build a small representative set covering the smallest, typical, and largest documents, plus pages with dynamic assets. Estimate each vendor’s cost under its own published meter, include retries and peak concurrency, and repeat the calculation against current plans before choosing.

Reliability, throughput, and data handling

Design for rendering failures

Set a client timeout long enough for your documents, while respecting each API’s service limits.
Classify failures by status and response body. Browserless’s OpenAPI reference lists malformed requests, authorization failures, disallowed destinations, timeouts, rate limits, server errors, and service unavailability.
Retry transient timeouts, rate limits, and service errors with bounded exponential backoff and jitter. Do not blindly retry malformed inputs or authorization failures.
Make document generation idempotent. Use your own job ID or document version so retries do not issue duplicate business actions.
For callback workflows, persist job state before acknowledging callbacks, and make callback processing safe to repeat.
Monitor success rate, render duration, output size, retries, and queue age for your own documents. The research does not establish comparable vendor uptime or performance measurements.

Control concurrency

Html2Pdf.app’s reviewed pricing page describes increasing parallel conversion limits on paid plans. Browserless usage is browser-time based, so concurrency and long-running sessions affect consumption. Run a staged load test against your own representative workload within each provider’s published limits; do not infer throughput from the plan quota alone.

Review sensitive-data terms

Html2Pdf.app states that generated PDFs are processed temporarily and not permanently stored on its servers, and that raw HTML or text is not stored in conversion logs; it also says selected request metadata and a source URL may be retained. These are vendor statements, not an independent audit. Review its privacy policy and data processing agreement for the applicable conditions. The research did not establish a like-for-like Browserless retention comparison. For sensitive documents, review both vendors’ current privacy and processing terms, retention, processing location, access controls, and contractual commitments directly. Source: Html2Pdf.app documentation.

Common problems and fixes

Symptom	Likely cause	What to do
Request is rejected as malformed	Invalid JSON, missing required fields, or an unsupported option.	Validate the JSON and compare field names and values with the provider’s current schema. For Browserless, include either `url` or `html`, not both.
Unauthorized response	Missing, invalid, or incorrectly passed API key or token.	Check the Html2Pdf.app `X-API-Key` header or Browserless token query parameter. Keep credentials out of URLs you log or expose where possible.
URL cannot be reached or is disallowed	The render service cannot access the destination, or the destination is blocked by provider policy.	Confirm the URL is publicly reachable from the service, redirects resolve correctly, and access restrictions permit the request. Review Browserless’s documented disallowed-destination response.
PDF omits images or styles	External resources are inaccessible, slow, or blocked; fonts may not be available.	Check asset URLs and permissions, ensure resources finish loading, and test with a minimal document. Html2Pdf.app specifically notes resource and font availability as factors.
PDF captures a loading state or missing dynamic content	Client-side JavaScript has not populated the page when rendering occurs.	Use a supported readiness or waiting mechanism if available, simplify unnecessary scripts, and verify the rendered output on dynamic pages. Html2Pdf.app warns that JavaScript timing matters.
Request times out	Slow navigation, heavy assets, scripts, or a service-side limit.	Reduce page weight where possible, avoid waiting on irrelevant third-party resources, and tune client timeouts within provider limits. Retry only transient failures with backoff.
429 or rate-limit response	Request rate or parallel jobs exceed the allowed limit.	Queue work, cap concurrency, honor retry guidance, and use backoff with jitter. Check the account’s current plan limits.
PDF layout differs from browser view	Print CSS, paper size, margins, orientation, or page-break rules differ from screen layout.	Set print-specific styles and explicit layout options, then inspect output at the intended paper size.
Tagged PDF fails an accessibility requirement	Tagged structure alone does not establish formal PDF/UA conformance.	Validate with an accessibility checker and remediate source markup and output as needed. Browserless explicitly says its tagged output is not certified PDF/UA.
Callback processing duplicates work	The callback was delivered again or the handler ran more than once.	Store a durable job state and make callback handling idempotent. Follow the provider’s documented callback verification behavior.

A practical selection checklist

List your inputs: URL, raw HTML, or both; identify authentication and network access constraints.
Collect representative documents, including dynamic pages, large images, unusual fonts, and long multipage output.
Write down required print controls: paper size, margins, orientation, background, headers and footers, encryption, or permissions.
Decide whether you need synchronous output, callback-based completion, or a larger browser automation platform.
Measure output size and render duration for the same workload, then calculate cost with each service’s own usage unit.
Review rate limits, concurrency, error behavior, data-processing terms, and any formal accessibility requirements.
Choose the integration that meets your actual controls and governance needs with acceptable measured cost.

ScreenshotNeo as an alternative to try first

For teams whose document workflow starts with taking website screenshots, try ScreenshotNeo first. It is a website screenshot API and MCP server from Yorker Media; it returns PNG, JPEG, WebP, or PDF from one GET request. It is a fit when you need a clean website capture and PDF output, rather than a general raw-HTML document conversion workflow.

ScreenshotNeo accepts cookie and consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and responses identify the page verdict and billing status in headers. Its MCP server exposes take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients. The API supports PDF options including paper size, margins, landscape, and page ranges. See the ScreenshotNeo documentation.

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp

The free plan includes 1,000 screenshots per month with no card. Paid plans start at $5 for 3,000 screenshots; every feature is available on every plan. Sign up free for 1,000 screenshots a month with no card.

FAQ

Can both services convert raw HTML, not just a URL?

Yes. Both document raw HTML input. Browserless’s PDF endpoint accepts either url or html, but not both in the same request.

Which service is cheaper?

There is no universal answer from the published quota figures: Html2Pdf.app meters generated size in credits, while Browserless meters browser connection time. Estimate with your own output sizes and render durations using current plans.

Does Browserless generate certified accessible PDFs?

Its documentation says tagged output may preserve structural information but is not certified PDF/UA. Validate PDFs if formal conformance is required.

Are the two services’ data-retention practices equivalent?

The reviewed sources do not establish that. Html2Pdf.app publishes handling statements; the research did not find a matching Browserless comparison. Review current terms for both vendors.

Were these services benchmarked for this comparison?

No. This comparison summarizes documented capabilities and pricing units; it does not claim measured speed, reliability, or comparative performance.