Product

One API, twelve operations

Rendarium exposes a whole document family behind one authentication scheme, one credit model and one set of client libraries. Pick the operation, send the input, receive the artifact.

HTML to PDFPixel-accurate rendering with a modern Chromium engine: CSS, web fonts, JavaScript, headers, footers and page numbers.URL to PDFPoint at any public page and get a print-quality PDF back, cookies and custom headers included.HTML to ImageCapture HTML or a URL as PNG, JPEG or WebP at any viewport size.Word to PDFDOCX conversion with faithful layout, fonts, tables and images.Excel to PDFXLSX workbooks to paged, printable documents, sheet by sheet.RTF to PDFRich Text Format documents converted in one call.Markdown to PDFREADMEs, docs and release notes straight to shareable PDFs.PDF BuilderCompose a document from commands: text, HTML templates, images and shapes at exact positions.PDF EditStamp, watermark, add headers and footers, set metadata and security on existing PDFs.PDF MergeCombine documents into one, in the order you send them.Text MeasureMeasure text and HTML templates before rendering, so layouts fit on the first try. Free.Async JobsSubmit large workloads and poll for the result instead of holding a connection open.

Engine capabilities

The engine behind every operation, whether you call the hosted API or run the container yourself.

Modern Chromium rendering

HTML is rendered by an up-to-date Chromium engine, so what you see in the browser is what you get in the PDF: CSS Grid and Flexbox, web fonts, SVG, JavaScript-driven charts, print media queries and CSS page breaks. Wait for a JavaScript variable, a network idle or a fixed delay before capturing dynamic pages.

Headers, footers and page numbers

Define headers and footers as HTML, with page number and page count placeholders, different first and last pages, and repeated table headers across page breaks. Margins, page size and orientation are set per request.

PDF/UA and PDF/A output

Produce tagged, accessible PDF/UA documents and archival PDF/A documents directly from HTML, with a document structure derived from your headings, lists, tables and alt text. Existing PDFs can be post-processed for compliance.

Form fields, outlines and security

HTML form elements become fillable PDF fields; headings become a navigable outline; links are preserved as clickable annotations. Encrypt output with user and owner passwords, set permissions and add digital signatures.

Office and text formats

Word DOCX, Excel XLSX, RTF and Markdown are converted with their own layout engines — no Office installation, no LibreOffice, no fonts to install on the server.

PDF processing

Merge documents, stamp HTML onto existing pages, add watermarks, extract text and images, search text, convert PDF pages to images and set metadata — the same processing library behind the conversions, exposed as endpoints.

Two ways to run it

Hosted API

We run the engine on api.rendarium.com. You get an API key, a credit balance and a dashboard. Best when you want documents without operating anything.

Hosted API →

Self-hosted Docker

The same engine as a container on your infrastructure, activated with an offline license key. Best when data must stay inside your network or volumes are very high.

Self-hosted Docker →