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Our free online document converter supports a wide range of document formats including PDF, DOCX, XLSX, PPTX, TXT, HTML, CSV and more. All conversions are performed directly in your browser using WebAssembly technology, ensuring your documents remain private and secure.
Whether you need to convert documents for work, convert spreadsheets to PDF, or transform presentations, our tool provides fast and reliable conversions while preserving formatting.
Document formats determine how text, images, tables, and styling information are stored in a file. Choosing the right format affects whether your document looks the same on every device, whether others can edit it, and how large the file will be. Here is what you need to know about the most common formats.
DOCX is the default format for Microsoft Word since 2007. It stores content as compressed XML, which makes files smaller than the older DOC format while supporting rich formatting, embedded images, tracked changes, and macros. DOCX is widely supported across word processors including Google Docs, LibreOffice Writer, and Apple Pages, though complex formatting may render slightly differently outside of Word.
ODT is the open-standard document format used by LibreOffice and OpenOffice. Because it is an ISO-certified open standard, ODT files are not tied to any single vendor. Government agencies and organizations that prioritize long-term document archival often prefer ODT for this reason. Most modern word processors can open ODT files, but formatting fidelity can vary when moving between ODT and DOCX.
RTF was created by Microsoft in 1987 as a cross-platform document format. It supports basic formatting like bold, italic, font sizes, and colors, but lacks advanced features such as tracked changes, embedded spreadsheets, or complex page layouts. RTF remains useful when you need formatted text that opens reliably in virtually any word processor or text editor.
TXT files contain only raw text characters with no formatting whatsoever. This simplicity is their strength: they are tiny, open instantly, and can be read by any device or operating system. Plain text is the right choice for configuration files, quick notes, README files, and any situation where the content matters more than its appearance.
PDF was designed by Adobe to present documents identically regardless of the software, hardware, or operating system used to view them. PDFs preserve exact page layouts, fonts, and graphics. They are ideal for final documents that should not be edited, such as contracts, invoices, and published reports. While PDFs can be converted back to editable formats, the results depend heavily on the complexity of the original layout.
| Format | Created By | Formatting Support | Cross-Platform | Best For |
|---|---|---|---|---|
| DOCX | Microsoft | Full (styles, images, macros, tracked changes) | Good | Business documents, collaborative editing |
| ODT | OASIS (open standard) | Full (styles, images, tracked changes) | Excellent | Open-source workflows, government archival |
| RTF | Microsoft | Basic (fonts, colors, alignment) | Excellent | Universal compatibility, simple formatted docs |
| TXT | N/A (universal) | None | Universal | Notes, code, config files, data exchange |
| Adobe | Full (fixed layout, fonts, vector graphics) | Universal | Final documents, printing, legal contracts | |
| CSV | N/A (universal) | None (data only) | Universal | Tabular data, database import/export |
| HTML | W3C (open standard) | Full (CSS-based styling) | Universal | Web publishing, email content |
Use PDF if the document is final and should not be edited. Use DOCX if the recipient needs to make changes or leave comments. If you are unsure what software they use, PDF is the safest choice because every modern device can display it identically.
Use DOCX if your team uses Microsoft 365, or ODT if your team uses LibreOffice. Both formats support tracked changes and comments. For real-time collaboration, consider uploading to Google Docs or SharePoint and downloading in your preferred format when finished.
Use CSV for tabular data that needs to move between spreadsheets, databases, or analytics tools. Use TXT for unstructured text. Use HTML when the data will be displayed on the web or in email clients.
Use PDF/A (an archival subset of PDF) or ODT for long-term storage. Both are based on open standards, which means they are less likely to become unreadable as software evolves. Avoid proprietary formats for documents you need to access decades from now.
Use RTF when you need basic formatting that opens reliably everywhere, including older operating systems and stripped-down text editors. RTF files are also a common choice for legal document templates because of their broad compatibility.
It depends on the source and target formats. Converting between similar rich-text formats like DOCX and ODT usually preserves most formatting, though minor differences in font rendering or spacing can occur. Converting to simpler formats like TXT or CSV will strip all formatting and keep only the raw text or data. Converting to PDF preserves the visual layout perfectly but makes the document harder to edit afterward.
DOC is the older binary format used by Microsoft Word from 1997 to 2003. DOCX, introduced with Word 2007, uses XML packaged in a ZIP container, resulting in smaller file sizes, better data recovery, and improved compatibility with non-Microsoft software. There is no practical reason to use DOC today unless you need to support very old versions of Word. Converting DOC files to DOCX is recommended for better compatibility and smaller file sizes.
Not perfectly, no. PDF stores a visual representation of the page rather than a structured document. Simple PDFs with straightforward text and basic formatting convert reasonably well. However, complex layouts with multiple columns, text boxes, tables, headers, footers, and embedded graphics will likely require manual cleanup after conversion. Scanned PDFs (which are essentially images) require OCR (optical character recognition) before text can be extracted at all.
PDF has the broadest native support: every modern computer, phone, and tablet can display PDFs without installing additional software. For plain text content, TXT files are universally readable. For editable documents, DOCX has the widest support among rich-text formats, with native or compatible editors available on Windows, macOS, Linux, iOS, Android, and the web through Google Docs and Microsoft 365.
Browser-based converters use WebAssembly (Wasm) and JavaScript to process files entirely within your web browser. When you upload a file, it is read into your browser's memory, parsed according to the source format's specification, and then re-encoded into the target format. Your files never leave your device, which makes the process private and secure. The tradeoff is that very large or complex files may convert more slowly than server-based tools since they rely on your device's processing power.