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 complex XLSX spreadsheets into MOBI ebook files effortlessly. This tool is designed for users who need to read tabular data on their Kindle or ebook readers.
XLSX is a structured grid-based format developed by Microsoft for financial and statistical data management. In contrast, MOBI is a reflowable document format optimized for handheld reading devices. When you convert XLSX to MOBI, our engine translates the spreadsheet cells into a structured, readable layout that adapts to your screen size, ensuring that complex tables are presented in a way that remains legible on e-ink displays.
The conversion process is lossless, ensuring that all data points and labels are preserved exactly as they appear in the source spreadsheet.
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
