Report Viewer: view, explore, and export reports in any application

Yes, Bold Reports is free to try for 30 days, no credit card required.

Crystal Reports .rpt files use SAP's proprietary format, so they're converted to RDL before rendering. Bold Reports provides a Crystal-to-RDL conversion tool that automates this — it processes your .rpt reports and generates RDL equivalents, carrying across layout and formatting so you're not rebuilding by hand.

Yes. You can show, hide, rearrange, or add custom toolbar items, and apply a Material, Bootstrap, Fabric, or high-contrast theme — or override the CSS to match your application's branding. See Toolbar customization and Theming in the docs for the full API.

The viewer renders on demand, page by page — only the requested page is processed and streamed rather than the whole report at once, so load time stays roughly flat as report size grows. For example, a 5,000-row financial statement that paginates into 200 pages loads the first page in about the same time as a 10-page report, because the viewer isn't rendering all 200 pages up front. See On-demand paging in the docs for configuration details.

Yes. Row-level security and role-based access control are built-in — access rules bind to roles or group membership, so one report definition serves everyone while each user sees only their authorized rows. Because the viewer also renders whatever dataset it's passed, you can enforce additional filtering in your own data layer before rendering.

For enterprise and customer-facing applications, check that a report viewer renders your existing report format, supports cascading and multi-value parameters, offers drill-down and drill-through, exports to standard formats, enforces row-level security, renders large reports page by page and can be themed to your brand. The Bold Reports Web Report Viewer provides each of these for RDL and RDLC reports, with export to seven formats and Material, Bootstrap, Fabric and high-contrast themes. As an enterprise reporting component it pairs with the Web Report Designer and Report Writer.

A web-based report viewer has two parts: a component in the browser and a report service on the server. In Bold Reports, the Web Report Viewer component sends the report path and parameter values to the report service, the Web API set in reportServiceUrl, which processes the RDL or RDLC definition against its data source and streams only the requested page. Reports can be stored on Bold Reports Report Server, set in reportServerUrl, or in your own application.

Yes. The Bold Reports Web Report Viewer renders the RDL and RDLC report definitions used with the Microsoft ReportViewer control, so existing reports are kept rather than rebuilt. Viewer components are available for ASP.NET Web Forms, ASP.NET MVC and ASP.NET Core, as well as JavaScript, Angular, React and Blazor. Reports that rely on custom extensions or SSRS-server-specific features are identified during migration.

In Bold Reports, sparklines and gauges are report items you add to the layout in the Web Report Designer and bind to a dataset field. The Bold Reports Web Report Viewer then renders them at view time, alongside charts, data bars, indicators and maps, and keeps them in PDF, Word and Excel exports.