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A direct PDF URL addresses the PDF file; a viewer URL addresses a web page or application that loads and displays the file. Either can lead to the same document, but neither URL type alone determines whether it opens in a browser, downloads, or works correctly. The server’s response headers, the PDF’s media type, and the browser or viewer all affect what happens.
What each URL points to
Direct PDF URL
A direct PDF URL resolves to the PDF resource itself. The browser or another user agent handles that resource based on its capabilities and the server’s response. It may display the document in an integrated viewer, download it, prompt the reader, or open it in another application. A .pdf suffix does not guarantee a particular outcome. Content-Disposition and the response’s media type help determine how the resource is handled. MDN’s anchor documentation also describes how link handling depends on the resource and browser.
Viewer URL
A viewer URL resolves to an HTML page or application that presents a PDF within its own interface. That page loads the PDF and may provide navigation or surrounding context. The viewer page and the document are separate resources, so both must be available and configured to work together.
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Why a PDF link downloads instead of opening
The URL alone does not control the result. The server’s Content-Disposition response header indicates whether content is intended to display inline or as an attachment. MDN describes inline as the default disposition and attachment as generally prompting download behavior. The media type and browser capabilities also matter.
- A server can signal attachment behavior even when the URL ends in
.pdf. - A browser may lack an integrated PDF viewer, or that viewer may be disabled.
- A viewer page may fail because of its configuration, document access restrictions, or resource-loading constraints.
These outcomes depend on the particular server, document, browser, and viewer. Do not assume that every direct link opens in a tab or that every viewer link succeeds.
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How to link to a specific PDF page
PDF fragment identifiers can add navigation information to a document URL. RFC 8118, an IETF informational RFC published in March 2017, describes fragments as a way to reference subordinate content or add parameters to the process of opening a document. Its page=<pageNum> parameter identifies a physical page, with the first page numbered 1. Named destinations are another supported concept.
A page-specific direct link can therefore use a fragment such as #page=3. Fragment handling depends on the PDF processor, so test the link in the viewer your readers are likely to use if landing on the precise page matters. RFC 8118 notes that the fragment-identifier specification was incorporated into ISO 32000-2; the ISO definition prevails if the two disagree.
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Which link should you use?
| Need | Starting point | Why and what to check |
|---|---|---|
| Share the document with minimal site-specific framing | Direct PDF URL | It points to the resource. The receiving browser or app determines presentation, subject to server headers and support. |
| Keep readers in a site interface or provide surrounding context | Viewer URL | The page can present navigation and context around the PDF. Keep the viewer and document URL working together. |
| Link to a page or named destination | Direct PDF URL with a fragment, or viewer-specific navigation | PDF fragments provide page and destination conventions, but verify behavior in the intended processor. |
| Encourage a download | Serve the PDF with an appropriate attachment response | The URL itself is not the whole control; the Content-Disposition response header is relevant. |
Passing a PDF to a PDF.js viewer
PDF.js documentation describes loading a PDF into its viewer through a file query parameter. Encode the PDF path or URL with encodeURIComponent() as the documentation directs; otherwise, characters in the URL can interfere with the query parameter. PDF.js also supports starting its viewer without a PDF and supplying one later.
The PDF.js FAQ describes conditional use of HTTP Range Requests to retrieve portions needed for visible pages. Whether that occurs depends on browser support and server response headers; it is not a guarantee that all viewers fetch only part of a PDF.
Quick Recap
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