rendex 1.1.1

Official Python SDK for Rendex — render HTML to images, generate PDFs, and capture screenshots

rendex

Official Python SDK for Rendex — the HTML-to-image, PDF, and screenshot rendering API. Turn raw HTML or any webpage into an image or PDF with a single function call.

• Full type hints (PEP 561 compatible)
• Single dependency (httpx)
• Sync API with context manager support
• Typed error handling with API error codes

Install

pip install rendex

Quick Start

from pathlib import Path
from rendex import Rendex

rendex = Rendex("your-api-key")

# Render raw HTML straight to a PNG
result = rendex.render_html("<h1>Hello, world</h1>")
Path("hello.png").write_bytes(result.image)

# Or capture a live URL
shot = rendex.screenshot("https://example.com", format="png", full_page=True)
Path("screenshot.png").write_bytes(shot.image)

print(f"{result.metadata.bytes_size} bytes, loaded in {result.metadata.load_time_ms}ms")

API Reference

Rendex(api_key, *, base_url="https://api.rendex.dev")

Create a new Rendex client.

rendex = Rendex("your-api-key")

# Or with context manager for connection reuse
with Rendex("your-api-key") as rendex:
    result = rendex.screenshot("https://example.com")

rendex.screenshot(url, **options)

Capture a screenshot and return the binary image with metadata.

result = rendex.screenshot(
    "https://example.com",
    format="webp",
    width=1920,
    height=1080,
    dark_mode=True,
)
Path("screenshot.webp").write_bytes(result.image)
print(result.metadata.load_time_ms)  # 350

Returns ScreenshotResult:

• image — bytes of the captured image
• metadata — ScreenshotMetadata with url, dimensions, format, bytes_size, load_time_ms, quality, etc.

rendex.render_html(html, **options)

Render raw HTML straight to an image and return the binary result. Convenience wrapper over screenshot(html=...).

result = rendex.render_html("<h1>Hello, world</h1>", format="png", width=1200)
Path("hello.png").write_bytes(result.image)

Returns ScreenshotResult — same shape as screenshot().

You can also pass html directly to screenshot() / screenshot_json():

result = rendex.screenshot(html="<h1>Hello, world</h1>", full_page=True)

HTML rendering is POST-only and accepts up to 5MB. It is not available via screenshot_url() (the GET endpoint can't carry an HTML body). Provide either url or html — not both; the SDK raises RendexError locally if you supply neither or both.

rendex.screenshot_json(url, **options)

Capture a screenshot and return JSON with a base64-encoded image.

result = rendex.screenshot_json("https://example.com")
print(result["data"]["bytesSize"])        # 45823
print(result["meta"]["usage"]["remaining"])  # 499

Returns ScreenshotJsonResponse dict with data (image + metadata) and meta (request ID, usage).

rendex.screenshot_url(url, **options)

Generate a GET URL for embedding. No network call — pure URL builder.

url = rendex.screenshot_url("https://example.com", format="png", width=1200)
# Use in <img> tags, OpenGraph, etc.

Note: The API key is included in the URL. Use server-side only.

Screenshot Options

All options are keyword arguments in snake_case. Only url (positional) is required:

Option	Type	Default	Description
format	str	"png"	"png", "jpeg", "webp", or "pdf"
width	int	1280	Viewport width (320–3840)
height	int	800	Viewport height (240–2160)
full_page	bool	False	Capture the full scrollable page
quality	int	80	JPEG/WebP quality (1–100, default 80)
delay	int	0	Delay before capture in ms (0–10000)
dark_mode	bool	False	Emulate dark mode
device_scale_factor	float	2	Device pixel ratio (1–3). 2× Retina by default
block_ads	bool	True	Block ads and trackers
block_resource_types	list	—	Block: "font", "image", "media", "stylesheet", "other"
timeout	int	30	Page load timeout in seconds (5–60)
wait_until	str	"networkidle2"	"load", "domcontentloaded", "networkidle0", "networkidle2"
wait_for_selector	str	—	CSS selector to wait for
best_attempt	bool	True	Return best-effort screenshot on timeout
selector	str	—	Capture a specific element by CSS selector

Error Handling

from rendex import Rendex, RendexApiError, RendexNetworkError

rendex = Rendex("your-api-key")

try:
    rendex.screenshot("https://example.com")
except RendexApiError as e:
    # API returned an error
    print(e.error_code)   # "RATE_LIMITED", "VALIDATION_ERROR", etc.
    print(e.status_code)  # 429, 400, etc.
    print(e.request_id)   # For debugging with Rendex support
    print(e.details)      # Validation details (if any)
except RendexNetworkError as e:
    # Network failure (DNS, timeout, connection refused)
    print(f"Network error: {e}")

Error Codes

Code	HTTP Status	Description
VALIDATION_ERROR	400	Invalid request parameters
INVALID_URL	400	URL failed SSRF validation
TIMEOUT	408	Page took too long to load
CAPTURE_FAILED	500	Browser rendering error
RATE_LIMITED	429	Rate limit exceeded
USAGE_EXCEEDED	429	Monthly credit limit reached
MISSING_API_KEY	401	No API key provided
INVALID_API_KEY	401	API key verification failed

License

MIT - Copperline Labs LLC