Rivoli PDF / Create accessible PDFs in C#
Create accessible PDFs in C#, not as an afterthought
An accessible PDF is one a screen reader can navigate: tagged headings, ordered content, declared language. Rivoli PDF builds the structure tree from the same headings and paragraphs you already write, so accessibility is a rendering mode, not a rewrite.
Install and generate
No system libraries, no headless browser, no per-platform setup. Rivoli.Pdf 0.1.0 targets .NET 8 and .NET 10.
using Rivoli.Pdf;
using Rivoli.Pdf.Model;
using Rivoli.Pdf.Styling;
var doc = Document.Create("Accessible Annual Report", "Acme Corp");
var section = doc.AddSection();
// Bold size >= 20 tags as H1 in the structure tree
section.Add(new Paragraph("Annual Report")
{ Style = new Style { FontSize = 22, FontWeight = FontWeight.Bold } });
section.Add(new Paragraph("Readable by screen readers, in order."));
var renderer = new PdfDocumentRenderer
{ PdfAMode = PdfAMode.PdfA1a, EnableTaggedPDF = true };
renderer.RenderToFile(doc, "accessible.pdf",
new PdfSaveOptions { PdfAMode = PdfAMode.PdfA1a,
EnableTaggedPDF = true, Language = "en-US" });The sample this comes from re-opens the generated bytes and verifies MarkInfo, StructTreeRoot, /Lang, and DisplayDocTitle are present, then prints the veraPDF command to validate against the external oracle.
The output
Real output from the runnable samples in the Rivoli PDF repository.
How we compare
Accessibility support across the usual candidates.
| Capability | Rivoli PDF | iText | Syncfusion |
|---|---|---|---|
| Free for small companies | AGPL only | Conditional | |
| Entry price (per developer) | $299 | Quote | ~$2,495/yr |
| Royalty-free redistribution included | |||
| Fully managed (no native deps) | |||
| Deterministic output | |||
| PDF/A-first | |||
| JSON document model + change tracking | |||
| Round-trip fidelity harness | |||
| Cross-language roadmap | 5 planned | Java/.NET | Multi |
Competitor prices are researched approximations (June 2026); several vendors are now quote-gated, so some figures are historical or third-party. Rivoli PDF is pre-1.0: document creation is feature-complete, while full parsing of arbitrary PDFs and rasterized rendering are partial and on the near-term roadmap.
Pricing
Free for individuals and for organisations under US$1M in annual gross revenue. One perpetual per-developer license for everyone else.
Full library, no watermark, no page limits. For individuals and organisations under US$1M in annual gross revenue.
Buy once, use forever. Royalty-free redistribution included, and the early-access rate locks in for life.
Full details on the product page and in the license terms.
Making existing documents accessible
If your current output is untagged, the fix is structural, and the structure is code you mostly have.
- 01 Replace visual-only emphasis with semantic heading styles; bold 20pt reads as a title to humans and tags as H1 for machines.
- 02 Turn on PdfAMode.PdfA1a and set the document language; both are save options, not content rewrites.
- 03 Give tables real header rows and lists real list items instead of styled paragraphs.
- 04 Add an accessibility check to CI: assert the structure markers exist in the output bytes, as our sample demonstrates.
- 05 Before migrating reading-heavy workflows (filling existing forms, rendering pages to images), check current support in the docs gallery: Rivoli PDF is pre-1.0 and strongest at authoring.
The full migration guide, with concept mappings and before/after code, lives in the documentation.
Start free. Pay only when you're big.
Install the package today. When your company crosses the US$1M line, the Founder rate locks in for life.