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 structured XLSX spreadsheets into the readable EPUB e-book format effortlessly. This tool is perfect for authors and analysts who need to transform tabular data into a portable, flowing document format for e-readers.
XLSX is a grid-based format designed for complex calculations and data organization in Microsoft Excel, while EPUB is a reflowable standard optimized for digital reading on tablets and e-readers. During the conversion process, our engine maps your spreadsheet rows, columns, and cell data into an HTML-based structure compatible with EPUB viewers. This transition adapts the rigid, static layout of a spreadsheet into a dynamic format that adjusts its presentation based on screen size, ensuring that structured data remains accessible outside of traditional spreadsheet software.
Your data remains entirely intact during this process; there is no loss of information, and the textual integrity of your spreadsheet cells is preserved perfectly. The resulting file size changes only slightly, reflecting the shift in metadata structure rather than data loss.
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
