Questions, answered plainly.

No. Every operation runs inside the browser tab on your own device. There is no server component, so there is nothing for a file to be uploaded to. The extension's background script never receives your file data either.

Yes. The PDF libraries are bundled inside the add-on rather than fetched from a content delivery network, so once Ember PDF is installed every tool works with no internet connection. Disconnecting and merging two files is the simplest way to confirm the privacy claim for yourself.

There are no limits imposed by Ember PDF, no watermarks and no daily quota. The practical ceiling is your own machine: because the work happens in memory, a very large document on a low-memory computer will be slower than a small one. Long jobs pause between pages so the tab stays responsive while they run.

They differ in kind, not just degree. Lossless re-saves the document and strips metadata, so text stays selectable and searchable. Aggressive converts every page into a JPEG image, which shrinks the file substantially but removes selectable text permanently. Ember PDF warns you before running the aggressive mode, and it is never the default.

Some PDFs are already optimised, and re-saving them can produce a slightly larger file. When that happens Ember PDF gives you the original back rather than a worse version, along with a note explaining why. Try the aggressive mode if the file genuinely needs to be smaller and selectable text is not important.

The way page numbers are printed on the document, starting at 1 and including both ends. A single page is 3. A block is 2-5. Individual pages are 1,4,7. You can mix them: 2-4,9. Leave the end off to run to the last page: 6-.

Any job producing more than one file is bundled into a single zip. Converting a forty page PDF to images would otherwise trigger forty separate downloads, which most browsers block partway through.

That is deliberate. Files staged for one tool are usually the wrong type for the next, and an obviously empty queue is better than a silent mismatch that fails halfway through. Add your files again after picking the tool you want.

PNG and JPG in both directions. PDF pages can be rendered out as PNG or JPG with an adjustable quality setting, and PNG or JPG files can be assembled into a PDF at one image per page.

The permissions cover opening the workspace tab, storing your settings, and the standard add-on lifecycle features shared across our extensions. Notably, Ember PDF does not request the downloads permission: saving works through a standard browser download link, which needs no special access to your file system.

Encrypted documents cannot be processed. If you load one, Ember PDF reports the actual reason rather than a generic failure, so you know to remove the password in your PDF reader first.

Right-click the toolbar icon and choose Remove Extension, or use the Add-ons manager. Step-by-step instructions for Firefox on Windows and Mac, plus Chrome and Edge, are on the uninstall guide.