You rename a file to Acme-Proposal-2026.pdf, upload it, and the browser tab says Microsoft Word - Document1. Or a colleague’s name. Or the name of a document you copied the template from two years ago.
The filename and the title are two different things, and readers show you the title.
Where the wrong name actually comes from
Every PDF carries a set of document properties in its Info dictionary — Title, Author, Subject, Keywords, plus Creator and Producer. When Word, Excel, or a report generator exports a PDF, it fills these in, often with whatever it had lying around, which is how Microsoft Word - Untitled1 ends up in front of your client. Those properties are what browsers display in the tab, what PDF readers show in the title bar, what file managers and document systems index, and what search engines read when the PDF is on a public site. Renaming the file changes none of them.
Upload it to View & Edit PDF Metadata and the full document properties display immediately: title, author, subject, keywords, creator, producer, PDF version, creation and modified dates, page count, page size, encryption status, whether the PDF is tagged, and whether it’s linearized for fast web viewing. Most people find at least one surprise on their first file.
Title, Author, Subject, and Keywords are editable, and each field pre-fills with its current value so you can see what’s there before you change it. Rewrite them and download — the pages themselves are untouched. A good title is what you’d want on the tab: Acme Ltd — Proposal, March 2026, not the filename, and not final_v7_REALLY_final. Author should be the organisation or person you want credited — it’s frequently wrong on documents built from a template. Subject and Keywords matter mainly if the PDF lives on a website or in a document management system, since that’s what gets indexed.
Where a wrong title actually costs you something
Client-facing documents are the obvious one — a proposal that opens as Untitled1 undercuts the work inside it. PDFs published on a website are the second: the title is what appears in search results and in the tab, and it’s a real ranking signal for the file. Documents going into a DMS or archive are the third — systems index properties, so a file with an empty or wrong title is one nobody finds later. And merged bundles inherit their properties from the first file in the stack, which is why an application bundle often carries the title scan0043; scans have no meaningful title at all to begin with, so setting one turns an unfindable scan0043.pdf into something searchable.
Properties can also leak more than you intend — a previous editor’s name, the software and version that produced the file, an internal project codename. Clearing a field drops the entry from the file rather than leaving it blank-but-present, and there’s a Remove all metadata button to empty every editable field at once. Worth doing before anything goes outside your organisation, alongside locking the file if it’s sensitive.
One limitation: an encrypted PDF has to be readable first. Remove its password with Unlock PDF, then view or edit its properties here.
Related reading: How to Check Who Created or Last Edited a PDF, How to Remove Metadata From a PDF, and How to Find Out What Font a PDF Uses for the other hidden property people go looking for.
Check or edit any of it with the free PDF Metadata tool — no registration, and the file is gone the moment you’re done.