Any file up to 500 MB. Drop several files and they come back as one ZIP. Many image, audio and video conversions run in your browser; anything else is uploaded and removed within the hour.
Convert your plain text TXT files into MOBI format to read them seamlessly on Kindle devices. This tool optimizes simple text documents for an enhanced e-reading experience.
The TXT format is a basic, unformatted container for raw text, lacking structural metadata like chapters or fonts. In contrast, MOBI is a specialized e-book format developed for Amazon Kindle, which supports metadata and basic navigation. When you convert TXT to MOBI, our engine wraps your raw text into the MOBI structure, allowing your e-reader to recognize the document as a book rather than just a plain text file.
Since TXT files contain no complex formatting or images, the conversion is lossless. The textual content remains identical, and the file size changes only insignificantly due to the addition of internal e-book metadata.
We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.
Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.
Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.
A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.
Office files, PDFs, ebooks, and plain text.
Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT
Raster and vector graphics for web, print, and photography.
Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF
Clips, streams, screen recordings, and movies.
Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG
Music, podcasts, voice recordings, and sound effects.
Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS
