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 rigid PDF documents into flexible MOBI files optimized for Kindle devices. This tool is perfect for readers who prioritize comfortable text reflow on e-ink screens.
PDFs are fixed-layout documents designed for printing, which often makes them difficult to read on smaller screens because the text does not adapt. MOBI is a proprietary format developed for e-readers that supports reflowable text. When you convert from PDF to MOBI, our engine extracts the textual content and structure, wrapping it into the MOBI format to ensure the text adjusts dynamically to your Kindle's font size and screen orientation.
The conversion process preserves the integrity of your document content without any loss of data. The final MOBI file maintains your original text, while the file size remains insignificantly different from the source.
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
