Question 1

How do I generate images from a template using an API?

Accepted Answer

RenderStack lets you design image templates in a visual drag-and-drop editor, mark any element as dynamic, then call a REST API with your custom data to generate unique images on demand. Send a POST request with JSON overrides for text, images, colors, and visibility — and get back a pixel-perfect PNG, JPEG, or PDF. No browser or canvas runtime needed on your end. See our [Getting Started guide](/docs/getting-started) and [cURL & API guide](/docs/curl-guide) for detailed instructions.

Question 2

Can I generate dynamic Open Graph (OG) images and social cards automatically?

Accepted Answer

Yes. Design your OG image template once in the visual editor, then generate unique social cards per page by calling the API or embedding a GET URL directly in your meta tags. RenderStack supports dynamic text, images, QR codes, and conditional visibility — so every page gets a unique, on-brand social preview without manual design work. Learn how with our [Dynamic Image URLs guide](/docs/dynamic-image-urls).

Question 3

What is the best alternative to Bannerbear, Placid, or HTMLcsstoimage for developers?

Accepted Answer

RenderStack is built API-first for developers who need more than basic image stamping. Unlike alternatives, it includes auto-layout containers that reflow content automatically, fallback chains for missing data, repeater elements for variable-count items, and conditional visibility rules — all handled server-side. You design visually but render programmatically with full deterministic control. See [Template Editor](/docs/template-editor) and [Rendering](/docs/rendering) docs for details.

Question 4

How do I generate personalized certificates, invoices, or PDF documents at scale?

Accepted Answer

Design your certificate or invoice layout in the RenderStack visual editor, mark fields like name, date, amount, and QR code as dynamic layers, then call the render API with each recipient's data. RenderStack outputs PNG, JPEG, or multi-page PDF. Repeater elements handle line items, and auto-layout containers reflow content when item counts change. See our [Rendering guide](/docs/rendering) for output format details.

Question 5

Can I use RenderStack with Webflow, WordPress, or no-code tools?

Accepted Answer

Absolutely. RenderStack provides embeddable GET URLs that you can paste directly into any HTML img tag — no server-side code required. Use the built-in [URL Builder](/docs/url-builder-docs) to construct the URL visually, set your overrides via query parameters (dot-notation supported), and embed the image URL in Webflow, WordPress, email templates, or any platform that supports HTML. GET API keys are scoped for safe client-side use.

Question 6

How does dynamic image URL embedding work without writing backend code?

Accepted Answer

RenderStack's GET endpoint lets you render images via a URL with query parameters. Add your template slug, a GET-scoped API key, and layer overrides using dot-notation (e.g., title.text=Hello&title.fill=%23ff0000) directly in an img src attribute. Built-in caching, rate limiting, and allowed-host restrictions keep it secure. The [URL Builder tool](/docs/url-builder-docs) lets you construct and preview these URLs without writing any code. See also the [cURL & API guide](/docs/curl-guide#error-format) for error handling.

Question 7

Can I generate images programmatically from a Cursor, Bolt, Lovable, or Replit vibe coding project?

Accepted Answer

Yes. RenderStack's REST API works with any language, framework, or AI-assisted coding tool. Whether you're building with Cursor, Bolt, Lovable, or Replit, you just make an HTTP POST with JSON data and get back an image or PDF. The API is straightforward enough that AI coding assistants can generate the integration code for you from the documentation alone. Check our [cURL & API guide](/docs/curl-guide) for examples.

Question 8

How do I handle missing data or optional fields in generated images?

Accepted Answer

RenderStack has built-in fallback chains. For each dynamic layer, you define an ordered strategy: try API-provided data first, fall back to initials, then a default value, or hide the element entirely. Auto-layout containers automatically reflow remaining elements when something hides. This means zero client-side logic for handling edge cases — the template handles it all. Learn more in the [Layers guide](/docs/layers).

Question 9

Can I generate images with variable numbers of items, like speaker cards or product grids?

Accepted Answer

Yes — repeater elements let you render 1 to N items from a single template. Define a repeater container in the editor, design one item layout, and send an array of data via the API. RenderStack clones the item for each entry, positions them according to your layout rules, and handles overflow automatically. One template covers any count. See the [Template Editor guide](/docs/template-editor) for details.

Question 10

Does RenderStack support custom fonts in generated images and PDFs?

Accepted Answer

Yes. Upload TTF or OTF font files through the asset manager, and they become available in both the visual editor and the server-side rendering engine. Your generated images and PDFs will use your exact brand typography with full control over weight, size, spacing, and alignment. See the [Custom Fonts guide](/docs/custom-fonts) for setup instructions.

Question 11

How do I add QR codes to dynamically generated images?

Accepted Answer

Add a QR code element in the template editor and mark it as dynamic. When you call the API, pass the URL or data string as an override, and RenderStack generates and embeds the QR code at render time. You can customize the size, position, and error correction level. If the QR data is invalid, the render continues with a warning instead of failing. Refer to the [Template Editor guide](/docs/template-editor) for QR code configuration.

Question 12

Is RenderStack suitable for e-commerce product image generation?

Accepted Answer

Yes. Design a product card template with placeholders for product name, price, image, badge, and description. Mark each as dynamic, then call the API with product data from your catalog to generate consistent, on-brand product images at scale. Auto-layout containers handle variable text lengths, and fallback chains gracefully handle missing product photos.

Question 13

How does RenderStack compare to using Puppeteer or headless Chrome for image generation?

Accepted Answer

Puppeteer and headless Chrome require you to maintain browser infrastructure, handle memory leaks, manage timeouts, and debug CSS rendering inconsistencies. RenderStack eliminates all of that — you design visually in a dedicated editor, and the server-side rendering engine produces deterministic output every time without a browser. It's faster, more reliable, and requires zero DevOps overhead.

Question 14

Can I upload a design mockup and convert it to an API-ready template?

Accepted Answer

Yes. RenderStack's AI Template Creation feature lets you upload a PNG, JPG, WebP, or PDF file. AI vision analyzes the layout, detects text blocks, image regions, shapes, and spatial relationships, then generates an editable template with properly positioned elements. You refine it in the visual editor and it's immediately ready for API rendering.

Question 15

What output formats does RenderStack support?

Accepted Answer

RenderStack renders to PNG (best for graphics with transparency), JPEG (best for photos, configurable quality 1-100), and PDF (including multi-page documents with up to 50 pages per render). You can set default output preferences globally or override the format per render request. See our [Rendering guide](/docs/rendering) for format details.

Question 16

How does team collaboration work in RenderStack?

Accepted Answer

RenderStack supports multi-tenancy with role-based access control. Create an organization, invite team members as owners, admins, users, or viewers — each role has specific permissions for templates, API keys, assets, and settings. All data is isolated per organization, and the activity log tracks every action by every member for full auditability. See the [Organization guide](/docs/organizations) for details.

Question 17

Can I auto-upload rendered images to my own AWS S3 bucket?

Accepted Answer

Yes. Configure your AWS S3 credentials once in settings (encrypted with AES-256-GCM at rest), and toggle S3 upload per render request. Rendered images are automatically uploaded to your bucket after generation. The upload is non-blocking — if S3 fails, the render still succeeds and you still get your image. Learn more in the [AWS S3 Integration guide](/docs/aws-s3-integration).

Question 18

How does RenderStack secure API access?

Accepted Answer

RenderStack provides four API key types — master, project, read-only, and GET — each with scoped permissions so you grant only the access needed. Keys can be rotated at any time, and GET keys support allowed-host restrictions to limit which domains, wildcard subdomains, IP addresses, and CIDR ranges can use them. Unauthorized origins are rejected before any rendering occurs. See the [API Keys guide](/docs/api-keys) for details.

Question 19

Is my data encrypted?

Accepted Answer

Yes. All data in transit is protected by TLS/SSL encryption. Stored credentials such as AWS S3 keys are encrypted at rest using AES-256-GCM. Database connections are encrypted, and session handling follows secure best practices. Your templates, assets, and rendered images are stored in isolated, secure cloud storage.

Question 20

What role-based access controls does RenderStack offer?

Accepted Answer

RenderStack supports four role levels — owner, admin, user, and viewer — each with granular permissions governing access to templates, API keys, assets, settings, and billing. All data is isolated at the organization level, so there is no cross-tenant access. RBAC is enforced on both the API and UI layers. See the [Organization guide](/docs/organizations) for role details.

Question 21

How are my templates and rendered images stored?

Accepted Answer

Templates, assets, and rendered images are stored in secure cloud storage with organization-level isolation. No data is shared across tenants. For full data sovereignty, you can configure automatic upload of rendered images to your own AWS S3 bucket — giving you complete control over where your outputs reside. See the [AWS S3 Integration guide](/docs/aws-s3-integration) for setup.

Question 22

Can I restrict which domains can use my API keys?

Accepted Answer

Yes. The Allowed Hosts feature for GET API keys lets you specify exactly which domains, wildcard subdomains (e.g., *.example.com), IP addresses, and CIDR ranges are permitted to use each key. Requests from unauthorized origins are rejected with a clear error, preventing unauthorized usage of your rendering quota. See the [Allowed Hosts guide](/docs/allowed-hosts) for configuration.

Question 23

Does RenderStack log activity for auditing and compliance?

Accepted Answer

Yes. Comprehensive activity logs track every action across the platform — including renders, API key creation and usage, member changes, template edits, and settings updates. Logs are filterable by user, category, level, and date range, and can be exported for compliance and auditing purposes.

Question 24

What happens if a render request contains invalid or missing data?

Accepted Answer

RenderStack handles errors gracefully. Fallback chains provide ordered strategies for missing data, and non-blocking rendering ensures a broken image URL or invalid QR code won't crash the entire render. You always receive output along with structured warnings in response headers (X-Render-Warnings) describing exactly what was skipped or substituted. See the [cURL & API guide](/docs/curl-guide#error-format) for error response details.

Question 25

Is there a free tier or trial available?

Accepted Answer

Yes. RenderStack offers a free trial so you can design templates, test the API, and generate renders without a credit card. When you're ready to scale, choose from flexible paid plans with usage-based pricing and optional overage allowances. Visit the [Pricing page](/pricing) to see current plan details.

Limits	Starter	Pro	Business	Enterprise
Templates	5	25	100
Renders / month	1k	5k	25k	100k
Output sizes per render	1	3	5
Batch size	—	25	100	500
Assets	25	100	500
Asset storage	250 MB	1 GB	5 GB	25 GB
API keys	2	10	50
Team members	2	10	25	50
Image cache entries	50	500	2k	10k
API rate limit	30/min	120/min	300/min	1000/min
GET rate limit	15/min	60/min	150/min	500/min

Features	Starter	Pro
REST API access
Dynamic image URLs
QR codes
PDF output
Custom fonts
Batch rendering
AWS S3 integration
Repeater elements
AI assistant included	Add-on	Add-on
Priority rendering
Smart Cover
Linked font sizes

Overages	Starter	Pro	Business	Enterprise
Render overage	Hard stop	$0.05/ea	$0.03/ea	$0.01/ea
Storage overage	Hard stop	Hard stop	$0.10/MB	$0.05/MB
AI overage	Hard stop	Hard stop	$0.05/call	$0.03/call
Smart Cover overage	Hard stop	Hard stop	Hard stop	Hard stop

Plans for every scale

Starter

Pro

Business

Enterprise

Detailed plan comparison

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