Tiny Online Tools
What this tool does
Modern office files are not documents — they are containers. A DOCX, XLSX or PPTX is a ZIP archive of XML parts held together by a content-types table and a relationship graph. An ODT, ODS or ODP is a different ZIP with a manifest instead. An XPS is a third kind of ZIP with fixed pages inside. A .pub and a legacy .doc are OLE compound files, a CHM is an ITSS storage, and an MHT is an RFC 2557 mail message. This tool opens all of them and shows what is actually in there.
It identifies the file by its bytes
The extension is a hint, not evidence. Files arrive renamed, exported by the wrong application, or downloaded with no extension at all. This inspector reads the first bytes and tells you exactly what it matched — PK 03 04 for a ZIP-based package, D0 CF 11 E0 A1 B1 1A E1 for an OLE compound file, ITSF for compiled help — and warns you when the extension disagrees with the contents.
What you get
- The complete part tree, with each part's size, the MIME type sniffed from its bytes, and the content type the package declares for it.
- Document properties: core, extended and custom properties for Office Open XML;
meta.xmlfields and document statistics for OpenDocument; the SummaryInformation property set for compound files. - The relationship graph — every relationship id, its type, its target and the part that target resolves to. Click a target to jump straight to that part.
- A part viewer: XML re-indented and syntax highlighted (these parts ship as one enormous line), images rendered, anything else offered as a download.
What it flags
Parts that [Content_Types].xml declares but the package does not contain. Relationships whose target is missing. Parts that nothing references. External relationships, which point at addresses outside the file. Embedded OLE objects. Macro projects (vbaProject.bin). An encrypted OpenDocument package.
Privacy
The file never leaves your computer. Unzipping, XML parsing and previewing all happen in your browser, and nothing is uploaded or fetched over the network.