Skip to content
Blog

Notes on what files carry.

One post per subject, written from the parsers. No news, no announcements; the changelog has those.

  1. A blank white luggage tag on a grey surface with a thin dark red cord loop

    4 min read

    Before you send a file to a stranger: a checklist

    Which metadata fields matter most for journalists, lawyers, HR and marketplace sellers, and the two-minute routine that catches them before the file goes.

  2. A plain white envelope lying sealed on a grey surface, one small dark red wax dot at the seal

    4 min read

    Why the file never leaves your browser

    A page can read bytes from a file and write a new one with no server. How the File API, byte-range reads and Blobs do it, and how the network panel shows it.

  3. A single charcoal SD memory card lying on a grey surface, one small dark red tab on its side

    4 min read

    What a JPEG carries, and what comes out

    EXIF, XMP, IPTC, Photoshop resources and comments: the five places a JPEG stores metadata, what each says about you, and what FileSanity removes and keeps.

  4. A closed white document folder lying flat on a grey surface, a thin dark red elastic band across one corner

    4 min read

    What a Word, Excel or PowerPoint file carries

    A .docx, .xlsx or .pptx is a zip of XML parts, and three are about you: core, app and custom properties. Plus a thumbnail, zip timestamps and comment authors.

  5. A small sheaf of white paper stapled at one corner with a single dark red staple, on a grey surface

    3 min read

    What a PDF carries, and the honest limits

    Where a PDF keeps its author, software and dates, the Info dictionary and the XMP packet. FileSanity blanks both in place, and says what it cannot reach.

RSS feed

The table is quicker than the post.

Drop a file on the home page and read what it carries.

Clean a file