Documents conversion
Convert TXT to MOBI
Updated Jul 2026
TXT is a plain text file with no formatting or chapters, and MOBI is an ebook format older Kindles can open directly, with a table of contents and adjustable font size. To convert TXT to MOBI, open the file in a converter and export it as MOBI. Doing this on your own computer keeps your writing off other people's servers.
- Extension
- .txt
- Type
- Documents
- Typically
- Plain text files
- Extension
- .mobi
- Type
- Ebooks
- Typically
- Older Kindles
Convert TXT to MOBI on your own computer. Nothing uploads.
How to convert TXT to MOBI
- Open Morphjet and drag in the TXT file you want to convert. Add one file or a whole folder at once.
- Choose MOBI as the output format.
- Convert. The MOBI file is written next to your original, and nothing leaves your machine.
TXT vs MOBI: what actually changes
| TXT | MOBI | |
|---|---|---|
| File size | Very small, plain characters only | Larger, since it adds structure for an ebook reader |
| Formatting | None, just text | Basic formatting, chapters, and a table of contents |
| Compatibility | Opens in any text editor or app | Opens on older Kindle devices and apps that read Mobipocket files |
| Metadata (title, author, cover) | None | Yes, can carry a title, author, and cover image |
| Quality | Lossless, it's just text | Lossless, the text carries over exactly, though it's reflowed into pages |
When to convert, and when not to
Convert TXT to MOBI when you want to read a plain text file like an ebook on an older Kindle, with page turning, adjustable font size, and a table of contents.
Keep the TXT file if you just need to open, search, or edit the text quickly, since plain text opens faster and works in any editor.
Why not just use an online converter?
A manuscript, a draft, or notes you've written are often personal, and an online converter means that text sits on a stranger's server while it's processed. Converting TXT to MOBI on your own computer means the words never leave your machine, whether it's a novel in progress or something you'd rather keep private.
Questions
Does converting TXT to MOBI lose any text?
No. The conversion is lossless, every word carries over. What changes is presentation: your plain text gets reflowed into pages that fit an ebook reader's screen.
Will chapters and a table of contents be added automatically?
Basic structure can be generated from the text, but a TXT file has no built-in chapter markers, so the result is simpler than an ebook that started out formatted. For a polished table of contents, you'd need to mark chapter breaks yourself first.
Do newer Kindles still read MOBI files?
MOBI was Amazon's original ebook format and is what older Kindles use natively. Newer devices favor other formats, but MOBI is still widely supported for reading.
Can I add a title, author, or cover to the MOBI file?
Yes, MOBI supports basic metadata like title, author, and a cover image, which a plain TXT file has no way to store.
Can I convert TXT to MOBI without uploading it anywhere?
Yes. A desktop app like Morphjet does the conversion on your own computer, so the file never travels over the internet.
Morphjet converts TXT, MOBI, and 1,800+ other formats, all on your machine. Launching this July.