TXT to MOBI Converter
Convert plain text to Kindle MOBI online. Free, private, and processed entirely in memory.
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About Converting TXT to MOBI
TXT is unformatted plain text — the simplest, most portable document format. It contains only characters, no styling, and opens instantly everywhere. When you need to move away from TXT, the usual reason is simple: no formatting, images or layout.
Converting your TXT document to MOBI solves that. MOBI is a legacy Amazon Kindle e-book format. Although Amazon now prefers AZW3/KFX, MOBI remains widely compatible with older Kindle devices and apps. In practice you gain works on older kindles and reflowable text. PrivConvert runs the whole TXT-to-MOBI conversion in server memory and deletes your file the instant the MOBI is ready — nothing is stored, logged or reused.
When this conversion helps
- You need works on older Kindles
- You need reflowable text
- Sharing a TXT document with someone whose software expects MOBI
Tips for best results
- Files up to 250 MB are supported, and you can batch-convert several TXT files at once; each is processed privately and deleted immediately.
How to Convert TXT to MOBI Online
Here is how a TXT → MOBI conversion works on PrivConvert, from start to finish. What you gain with MOBI: works on older Kindles.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 20 files at once.
Once uploaded, the conversion from TXT to MOBI starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
A more private way to convert TXT files
Plenty of sites convert TXT files. Very few promise never to keep them — PrivConvert does, and backs it up with how the service is built.
Your files are handled entirely by automated code. No staff, partner or AI model ever reads, stores or trains on your data.
Files are processed in volatile memory (RAM) and purged the instant your download is ready — nothing is ever written to disk, cached or backed up.
Every upload and download is protected with TLS 1.3, so your e-book cannot be intercepted on the way to the server or back to you.
Convert instantly with no sign-up, no email and no profiling cookies. We never build a profile around you or the files you convert.
TXT vs MOBI - Format Comparison
| Feature | TXT | MOBI |
|---|---|---|
| File extension | .txt | .mobi |
| Full name | Plain Text | Mobipocket eBook |
| Encoding | Text | Binary |
| Editable | Yes | No |
| Open standard | Yes | — |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 20 files simultaneously | |
Why people pick PrivConvert for MOBI
Thousands of people trust PrivConvert with their files because privacy here is structural — enforced by how the service runs, not just promised.