Online Microsoft Word (DOCX) Viewer
Read .docx and .rtf documents cleanly in your browser without Microsoft Office installed—100% private, client-side rendering.
Drag & drop files here, or click to browse
Open single or multiple files simultaneously in tabs
🔒 Your files stay on your device. We never upload your files to any server.
How DOCX Open XML Documents Work & Why Local Viewing Matters
Introduced with Microsoft Office 2007 and standardized under ECMA-376 and ISO/IEC 29500, the .docx format (Office Open XML WordprocessingML) replaced legacy binary .doc files with a modular ZIP archive container. Inside every .docx file—identified by the PK (0x50 0x4B 0x03 0x04) ZIP header—lies a hierarchy of XML parts including word/document.xml for body paragraphs and tables, word/styles.xml for typography rules, and word/media/ for embedded images.
When you receive a .docx attachment on a machine without Microsoft Word—such as a Linux workstation, Chromebook, developer laptop, or mobile tablet—opening the file often means uploading it to a cloud document suite that indexes your text and stores it on remote drives. For resumes, unpublished manuscripts, legal drafts, and internal HR policies, automatic cloud syncing is frequently undesirable or prohibited.
FilePeek unpacks and renders .docx and .rtf files directly in your browser memory using Mammoth.js combined with strict client-side HTML sanitization. Headings, paragraphs, bulleted and numbered lists, tables, and inline formatting are transformed into clean, accessible semantic HTML with an automatically generated Document Outline sidebar and live word/character statistics—all without transmitting a single byte over the network.
Technical Specifications
Architectural details and file format parameters verified by FilePeek.
| Format Standard | ECMA-376 / ISO/IEC 29500 (Office Open XML) |
|---|---|
| MIME Type | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Container Signature | 50 4B 03 04 (PK.. ZIP Local File Header) |
| Also Supports | Rich Text Format (.rtf — {\rtf1 signature) |
| Maximum Local File Size | 500 MB (.docx / .rtf) |
| Security Sanitization | DOM-isolated HTML stripping scripts & active macros |
How to Open & View DOCX Viewer Files
Step-by-step instructions for viewing files without installing desktop software.
Drop Your .DOCX or .RTF File
Drag your Word document onto the FilePeek dropzone or click "Browse Files" to select it from your computer.
Verify OOXML Container Integrity
FilePeek validates the PK ZIP container signature (or {\rtf header) and parses the internal XML structure in browser RAM.
Read with Document Outline & Typography Controls
Navigate sections via the H1–H3 outline sidebar, adjust font size for comfortable reading, and inspect tables and lists.
Review Word Count or Print cleanly
Check instant word and character counts in the document toolbar or use the print-friendly view to export to paper or PDF.
DOCX Viewer Viewer Features
Modern browser utilities designed for clarity, performance, and privacy.
Clean Semantic HTML Rendering
Maps Word styles to semantic headings, tables, blockquotes, and lists for crystal-clear reading without layout clutter.
Interactive Heading Outline Sidebar
Automatically extracts H1, H2, and H3 headings so you can jump across long specifications and reports with one click.
Live Word, Character & Paragraph Counts
Calculates accurate word count, character count, and estimated reading time immediately upon opening the file.
Macro & Script Immunity
Never executes VBA macros, ActiveX controls, or external template injections—making it safe to inspect untrusted attachments.
Built-In RTF Support
Also parses Rich Text Format (.rtf) files by stripping control words and preserving structured text paragraphs.
Adjustable Reading Typography
Scale text size up or down and toggle full-width or page-centered layout to reduce eye strain.
Common Real-World Scenarios
How professionals and casual users rely on FilePeek's local engine daily.
Preview candidate resumes and cover letters rapidly in multiple tabs without launching heavy desktop office suites.
Read product requirement documents (PRDs) and client specifications on Linux or macOS machines without Office licenses.
Inspect incoming .docx email attachments safely in a macro-free, zero-execution browser sandbox.
DOCX Viewer Frequently Asked Questions
Answers to common questions regarding DOCX Viewer rendering and privacy.
Do I need Microsoft Word or Office 365 installed to use this DOCX viewer?
No. FilePeek includes its own browser-based Open XML parser that converts .docx files into readable HTML locally without needing Microsoft Office.
Can a malicious Word macro execute when I open a .docx file in FilePeek?
No. FilePeek only extracts text, structural XML, and static formatting. Any embedded VBA macros, OLE objects, or scripts are completely ignored and stripped.
Does FilePeek support older .doc (Word 97-2003) binary files?
FilePeek natively supports modern .docx (Office Open XML) and .rtf (Rich Text Format) documents. Legacy binary .doc files can be saved as .docx or .rtf for viewing.
Are embedded tables and lists preserved when viewing a DOCX file?
Yes. Tables, bulleted lists, numbered lists, bold/italic emphasis, and heading hierarchies are preserved and styled for high legibility.
Is my document stored anywhere after I close the browser tab?
Never. FilePeek does not use server storage, cookies, or localStorage to save your document contents. Closing the tab erases the file from browser memory.
Related File Viewers
Explore other zero-installation format viewers available on FilePeek.