Send to Kindle supported file types

The published list

• PDF. Listed on the Windows page. Amazon’s notes page includes PDF when it uses an adjustable layout. Print-format PDFs can be written on directly on Kindle Scribe. Handwriting is not supported on PDFs loaded by USB.
• DOC. Listed on the Windows page. Ink drawings in a DOC file can make conversion fail. Delete them before sending.
• DOCX. Listed on the Windows page. The same ink warning applies. If you send from the Microsoft Word app, tracked changes are accepted. Comments become Kindle footnotes with a gray background when you choose “Like a Kindle book,” and they are hidden when you choose “Like a printed document.”
• TXT. Listed on the Windows page. Amazon treats text like other adjustable-layout documents, which can take active canvas and sticky notes on Kindle Scribe.
• RTF. Listed on the Windows page and on the help-page format list.
• HTM. Listed on the Windows page together with HTML.
• HTML. Listed on the Windows page. The help page writes the extensions as .HTML and .HTM.
• PNG. Listed on the Windows page as a personal-document image type.
• GIF. Listed on the Windows page.
• JPG. Listed on the Windows page.
• JPEG. Listed beside JPG. The help page groups them as one image type.
• BMP. Listed on the Windows page.
• EPUB. Listed on the Windows page. Handwriting is not supported in EPUB comics, manga, and children’s books.

Send one of these with Explorer, drag-and-drop, or the print dialog.

Notes support

Amazon’s notes page groups the same family of types and then splits what each device can do. Kindle Scribe has the widest set, including handwriting. Other Kindle e-readers get highlights and text notes. Kindle for PC and Kindle for Mac get text notes and highlights. Kindle for Web does not support personal documents yet.

The device-by-device list is on Send to Kindle features. The source page is Kindle personal document file types that support notes.

Conversion limits

Amazon’s conversion help names these failure points:

• Password protection or other security on the document.
• Microsoft Word ink drawings in DOC or DOCX.
• A language outside the set Amazon publishes. The list includes English and is kept on the help page rather than copied here.
• Large tables or tables with a complex format.

On Kindle Scribe, on-page markup, active canvas, or sticky notes also fail when a document contains tables with mixed text direction, drop caps, or tables inside tables; audio, video, or SVG; mathematical equations; footnotes inside footnotes; or linear gradients.

Documents already in the library from before 11 November 2022 need a fresh send through Send to Kindle if you want the later features. For Word’s own send command, ink on a “Like a Kindle book” DOCX is removed so conversion can proceed, and ink on a “Like a printed document” send is kept on the page. Amazon still says to delete ink from DOC and DOCX files because it can fail conversion.

Source: Tips about converting personal documents to a Kindle format.

MOBI, AZW, PRC, and PSZ

The current Windows page and the help-page format list do not name MOBI, AZW, PRC, or PSZ. The winget installer manifest for 1.1.1.260 still registers those extensions, along with TXT, DOC, DOCX, RTF, PDF, PNG, JPG, BMP, JPEG, and GIF. A registered extension is not the same thing as a format the Windows page tells you to send.

EPUB, HTM, and HTML are on the Windows page and are not in that installer extension list. Use the Windows page as the send list, and treat the manifest list as the extensions the installer registers.

The manifest is Amazon.SendToKindle.installer.yaml. Requirements for the app itself are on the download page.