Two settings, two situations. A link you click on a website is governed by the browser's own PDF preference. A file already on your disk is governed by the operating system's file association. Changing one has no effect on the other.
Work out which situation annoys you before you change anything, because the two fixes are in completely different places.
The confusion is understandable. From where you sit both look like the same event: you wanted a PDF, you got a browser tab. But the two paths do not share a single setting between them, which is why so many people change the Windows default, find that links still open in a tab, and conclude the setting did not save.
Two questions, two settings
There is a third case worth naming because it catches people out. A PDF attachment opened from inside a mail client goes through that client's own handling first. Outlook, for instance, may preview it, save it to a temporary folder, or hand it to the system association depending on how you opened it. If PDFs behave correctly everywhere except in one application, that application is where to look.
The browser setting
Every major browser ships with a PDF viewer built in and every one of them lets you switch it off. The wording differs, the effect is the same: instead of rendering the file, the browser downloads it and hands it to your system.
- Chrome. Settings, then Privacy and security, then Site settings, then Additional content settings, then PDF documents. Choose Download PDFs rather than Open PDFs in Chrome. The setting is per profile, so a second Chrome profile keeps its own answer.
- Edge. Settings, then Downloads, where the option is phrased as always downloading PDF files. Edge is the default PDF handler on a clean Windows install, and Microsoft documents the viewer and the enterprise controls around it under the PDF reader in Microsoft Edge.
- Firefox. Settings, then General, then the Applications list. Find Portable Document Format and change the action from Open in Firefox to Use your system default or to a specific application.
- Safari. There is no direct switch. Safari displays PDFs inline and the practical answer is to hold Option while clicking a link, which downloads instead of opening.
The Windows file association
This one governs anything already saved on your disk: a file in Downloads, an attachment you saved, a document on a network share.
Change it from the file
Right-click any PDF, choose Open with, then Choose another app. Pick your reader, tick the box for always using it, and confirm. This is the quickest route and it applies to every PDF from then on.
Or change it from Settings
Open Settings, then Apps, then Default apps. Search for .pdf, or find your reader and set it as the default for that file type. Windows 11 makes you confirm per extension, which is slower but shows you exactly what changed.
If it will not stick
Check whether the reader is actually installed and current. A half-removed application can leave a registration pointing at an executable that is no longer there, and Windows quietly falls back to the browser. Reinstalling the reader rewrites it.
On macOS, remember Change All
The equivalent on a Mac is in Get Info, and it has one step people miss. Select a PDF, press Command and I, and open the section called Open with. Choose the application you want from the list. At that point you have changed one file.
The button underneath, Change All, is the one that applies the choice to every PDF on the machine. Without it you have set a preference for that single document and nothing else, and the next file you open will behave exactly as it did before.
Why the browser keeps winning
If you have changed this setting more than once, you are not imagining it. Four things reset it.
- Browser updates. A major version can reintroduce a content setting at its default, particularly when the underlying preference was renamed or moved.
- New installations. Installing a browser often offers to make it the default for related file types, and the offer is easy to accept without reading.
- Reader updates. The same is true in reverse. A PDF reader that has just updated may claim the association back, which is the desired outcome here but the same mechanism.
- Managed policy. On a work machine, group policy or mobile device management can set both the browser preference and the file association and reapply them at every sign-in. Nothing you change locally will survive that, and the fix is a conversation rather than a setting.
When the browser viewer is the right answer
It is worth saying that the built-in viewers are good, and for a great deal of what people do with PDFs they are the better choice. They open instantly, they run in a sandbox that limits what a malicious document can attempt, and they are available on a machine where nothing else is installed.
What they are not built for is documents you need to do something with. Interactive forms that must be filled and saved, digital signatures that must be validated, annotation that has to reach somebody else, redaction that has to be permanent: these need a real reader or a real editor, and a browser viewer will do some of them partially and others not at all.
Which suggests a more useful framing than switching everything one way. Leave the browser viewer to do what it is good at, reading, and open the documents that need work somewhere built for the job.
Work on the document, not just read it
Edit text, fill forms, sign and mark up, all in your browser with nothing uploaded and nothing to install.
Common questions
Getting PDFs to open where you want them, and keeping them there.
01Why does my PDF open in Chrome instead of Adobe?
Because two separate settings govern two separate situations. A PDF you click on a website opens according to the browser's own preference, while a PDF saved on your disk opens according to the Windows or macOS file association.
02How do I stop Chrome opening PDFs?
In Chrome settings, under Privacy and security, then Site settings, then Additional content settings, choose PDF documents and select Download PDFs. Chrome then saves the file and hands it to whatever your system opens PDFs with.
03How do I change the default PDF app in Windows?
Right-click any PDF, choose Open with and then Choose another app, pick the reader you want, and tick the box to always use it. The Default apps page in Settings does the same thing for every PDF at once.
04Why does it keep reverting after updates?
Browser updates can reset content settings, a new browser install may claim the association, and on managed machines an administrator policy reapplies the choice at every sign-in. On a work computer the policy is usually the reason.
05Does Microsoft Edge do the same thing?
Yes, and Edge is the default PDF handler on a clean Windows install. Its setting sits under Downloads and is worded as always downloading PDF files rather than opening them.
06Is the browser viewer actually worse?
Not for reading. It is fast, sandboxed and always available. It falls short on forms, digital signatures, annotation and anything a document needs a full reader for, which is when the switch is worth making.