Quick start

Every request is a POST to /v1/pdf with your key in Authorization: Bearer <key>. Sign up with your email to get a free key instantly (100 documents/month).

To try the examples below without signing up, use the public sandbox key. It allows 5 renders per IP per day (with a shared global cap), 1 page, up to 50 KB of HTML, and adds a "SANDBOX" watermark.

HTML → PDF

curl -X POST https://rendlet.com/v1/pdf \
  -H "Authorization: Bearer sandbox" -H "Content-Type: application/json" \
  -d '{"html":"<h1>Hello</h1><p>Rendered by Rendlet.</p>","options":{"format":"A4","margin":"15mm"}}' \
  -o hello.pdf

JSON + template → PDF

curl -X POST https://rendlet.com/v1/pdf \
  -H "Authorization: Bearer sandbox" -H "Content-Type: application/json" \
  -d '{"template":"invoice","data":{"number":"INV-1001","currency":"USD",
       "seller":{"name":"Acme Studio"},"buyer":{"name":"Globex"},
       "items":[{"description":"Design sprint","qty":1,"unit_price":1800}],"tax_rate":0.1}}' \
  -o invoice.pdf

For agents and serverless code

Add "response":"base64" to get JSON instead of a binary stream:

{"template":"itinerary","data":{...},"response":"base64"}
→ {"filename":"document.pdf","pages":1,"bytes":1710,"content_type":"application/pdf","base64":"JVBERi0x..."}

The machine-readable spec is at /openapi.json (OpenAPI 3.1). There is a short summary for LLMs at /llms.txt.

Built-in JSON templates

Templates render without a browser, so they're fast and the layout doesn't change between calls. GET /v1/templates returns a full example payload for each one.

invoice

Seller and buyer blocks, line items, tax rate, totals, notes, and an accent colour.

Fields: number, date, due, currency, seller{name,address,email}, buyer{name,address}, items[{description,qty,unit_price}], tax_rate, notes, accent

itinerary

A day-by-day travel plan with traveller details, timed activities and notes.

Fields: title, traveler, dates, days[{date,city,items[{time,activity,notes}]}], notes, accent

Your own (HTML)

Send any HTML/CSS document. It's rendered in headless Chromium with print backgrounds, page size and margins you choose.

API reference

Endpoint	Purpose
`POST /v1/pdf`	Render a PDF. The body is `{"html": "..."}` or `{"template": "invoice"\|"itinerary", "data": {...}}`. Optional: `options.format` (A4, Letter, Legal, A3, A5), `options.landscape`, `options.margin`, `options.printBackground`, `filename`, `response` (binary\|base64).
`GET /v1/templates`	Lists the templates with example requests. No key needed.
`GET /v1/usage`	Your plan and month-to-date document count.
`POST /v1/signup`	Get a free key: `{"email","plan","use_case","volume"}`. Returns `api_key` once.
`GET /openapi.json`	OpenAPI 3.1 spec.

Responses and limits

Successful renders return headers X-Pages, X-Plan, X-Quota-Limit and X-Quota-Remaining. Errors are JSON {"error": "...", "message"?: "..."}: 400 bad request, 401 missing key, 403 invalid key, 413 too large or too many pages, 429 quota exceeded, 500 render failed.

For HTML input, JavaScript is disabled and only data: URIs and public https:// assets are loaded.

Simplified Chinese is supported out of the box: both modes include Noto Sans SC, covering Latin and the 6,763 common GB2312 characters. For other scripts, embed a web font in your HTML.

Limit	Sandbox	Free	Starter	Pro	Scale
Documents	5 / IP / day	100 / month	1,000 / month	5,000 / month	25,000 / month
Requests per minute	3	10	30	60	120
Pages per document	1	10	50	200	500
HTML size	50 KB	1 MB	2 MB	2 MB	2 MB
Watermark	Yes	No	No	No	No

Keys are issued only through email signup: one free key per email, and at most 3 signups per network per day. Keys are stored hashed, so we can't show a key again, only rotate it.

Pricing

Every plan includes both HTML and template rendering. A document counts as one successful render.

Free

100 documents/month
Up to 10 pages each
No watermark

Get free key

Starter

$7/mo

1,000 documents/month
Up to 50 pages each
Email support

Pro

$19/mo

5,000 documents/month
Up to 200 pages each
Priority support

Scale

$59/mo

25,000 documents/month
Up to 500 pages each
Custom template on request

Paid plans are live: click Subscribe and paste your free key to upgrade it.

Monthly caps (no overage billing)

Every plan has a hard monthly cap: 100 (Free), 1,000 (Starter), 5,000 (Pro) or 25,000 (Scale) documents. You are never billed for extra documents.
At the cap, requests return 429 quota_exceeded with an upgrade_url and the next plan, until the 1st of next month (UTC) or until you upgrade. Upgrading takes effect as soon as payment completes.
Failed renders (4xx/5xx) never count toward the cap. X-Quota-Remaining shows what's left.

Refunds and cancellation

Cancel any time. Your plan stays active until the end of the paid period, with no further charges.
7-day money-back guarantee: if you're not happy within 7 days of your first payment and have used fewer than 20% of the included documents, email us for a full refund.
Service credits: if monthly availability drops below 99.5%, we credit 10% of that month's fee on request. Credits can't be exchanged for cash.

Changelog

Docs last checked 2026-10-18.

2026-10-18: Overage billing removed. Every plan now has a hard monthly cap: at the cap the API returns 429 with an upgrade URL, and you are never charged for extra documents.
2026-10-18: Moved to rendlet.com. Paid plans are live through Stripe Checkout. Added the Markdown docs, the comparison page and llms.txt updates.
2026-10-18: Renamed from the working name PageForge to Rendlet.
2026-10-17: Usage metering and rate limits, email-issued hashed keys, the sandbox key, Simplified Chinese fonts (Noto Sans SC), and refund terms.
2026-10-17: First release: POST /v1/pdf (HTML and JSON templates), invoice and itinerary templates, OpenAPI spec.