File viewers
File viewers for DOCX, XLSX, CSV, PPTX, JSON, VCF, Markdown, and TXT files in your browser.
XLSX Viewer
XLSX preview is paused while the spreadsheet parser is replaced.
DOCX Viewer
Read Word documents in the browser without Microsoft Word.
CSV Viewer
Open large CSV files as searchable tables.
PPTX Viewer
Extract PowerPoint slide text for quick review without PowerPoint.
JSON File Viewer
Open JSON files with validation, formatting, and search.
VCF Viewer
Open vCard contact files without importing them into a phone.
Markdown Viewer
Preview Markdown files with outline and source view.
Text File Viewer
Open TXT and LOG files with search, line numbers, and wrapping.
Popular tasks
Inspect data before cleanup
How to choose a file viewer
This section helps you choose the right viewer by file type: spreadsheets, documents, presentations, contacts, JSON, Markdown, and plain text. Files open in the browser, and each tool explains preview limits before you rely on the result.
How to choose a viewer
- XLSX Viewer - for Excel sheets, sheet tabs, and quick row search.
- DOCX Viewer - for reading Word documents without Microsoft Word.
- CSV Viewer - for CSV tables where columns and rows need a fast check.
- PPTX Viewer - for slide text and notes without PowerPoint.
What you can do
- Open a file on a shared computer or phone without installing Office.
- Inspect an attachment before sending, importing, or converting it.
- Check data, contacts, Markdown, or plain-text structure before the next step.
Formats and limits
- XLSX, DOCX, PPTX, and VCF can look simpler than desktop apps when a file uses complex styling, macros, or unusual elements.
- CSV, JSON, Markdown, and TXT are best for structure checks, search, and copying small fragments.
- Very large files depend on browser memory; if preview is slow, try a smaller file or close extra tabs.
Data and processing
Why browser-local matters
- Files stay on your device unless a specific tool says it uses a different processing mode.
- You do not need to send a document to an unknown service just to inspect it.
- After checking the file, you can continue to PDF, text, or developer tools without going back to search.
Common questions
Can I open files in the browser without sending them to a server?
Use a viewer from this category when the file type is supported. Current local viewers read the file in your browser and do not upload the file to Utilio.
Which browser file viewer should I choose?
Choose by file type first: DOCX for Word documents, XLSX for spreadsheets, CSV for data tables, PPTX for presentations, and text or Markdown viewers for plain text files.
When should I use a PDF, text, or developer tool instead?
Use PDF tools when you need to change a PDF, text tools when you need to edit pasted text, and developer tools when the file content is JSON, YAML, logs, or code.