Question 1

How do I open a PDF?

Accepted Answer

Drag and drop a file onto the page or use the file picker button.

Question 2

File size limit?

Accepted Answer

No hard limit — performance depends on your device. Most PDFs up to 200+ MB work well.

Question 3

Text selection?

Accepted Answer

Yes — select and copy text directly from the rendered pages.

Question 4

Private?

Accepted Answer

Yes — the file is rendered locally and never uploaded to any server.

Question 5

Print?

Accepted Answer

Use the browser print dialog (Ctrl+P) to print or save a copy.

Question 6

Keyboard navigation?

Accepted Answer

Page Up/Down, Space, Home/End, and Ctrl+/- for zoom are supported.

Question 7

What permissions does PDF Viewer need to function?

Accepted Answer

PDF Viewer only needs the standard web platform — file picker access for the inputs you choose to load, and optionally clipboard access if you copy the result rather than downloading it. There is no microphone, camera, geolocation or background-permission request, because none of those are needed for the work the tool does.

Question 8

Which browsers are supported by PDF Viewer?

Accepted Answer

PDF Viewer works in any modern browser released in the last few years — Chrome, Edge, Firefox, Safari, Brave, Arc and the major Chromium derivatives are all supported. The underlying engine relies on widely-supported web APIs, so there is nothing exotic to install. If you are on a very old browser version and the tool fails to load, updating to the latest release of your preferred browser is the only fix needed.

Question 9

Is PDF Viewer keyboard accessible?

Accepted Answer

PDF Viewer uses native HTML controls wherever possible, which means keyboard navigation, focus rings, and screen-reader labels work the way the platform expects. The drop zone accepts files via the keyboard-accessible file picker as well as drag-and-drop, and result downloads use standard browser download flows. If you spot an accessibility gap, Favtoo treats it as a bug worth fixing.

Question 10

Does PDF Viewer require a browser extension or plug-in?

Accepted Answer

No installation is needed. PDF Viewer runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use PDF Viewer on any computer you have temporary access to without leaving anything installed on it.

Question 11

What does the error message in PDF Viewer mean?

Accepted Answer

Failures usually fall into one of three buckets: the input is in an unsupported format, the input is over the size cap, or the input is structurally malformed (a truncated download, a partial export, or a stream the engine does not recognise). The first two are easy to confirm — check that your file is one of PDF and that it is below 200 MB. For the third, opening the file in its native viewer first is the fastest way to confirm the source is intact.

Question 12

What is the maximum file size for PDF Viewer?

Accepted Answer

Inputs are capped at 200 MB per file, which keeps memory usage stable across phones, tablets and older laptops. You can run PDF Viewer as often as you need; every run produces a full-quality result.

Question 13

Can I use PDF Viewer with formats other than the defaults?

Accepted Answer

PDF Viewer accepts PDF. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.

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