If you searched for how to edit a PDF on Mac for free, you have probably already tried Apple Preview, hit a wall, and landed on an online converter that wanted your file uploaded to its servers. There is a third option: a free, offline PDF editor that runs inside Safari, Chrome, or Arc and never sends your document anywhere.
The steps
- Open getpdfvault.com in any macOS browser.
- Drag your PDF onto the drop zone. The file is read straight into browser memory — it is not uploaded.
- Pick a tool: Editor to annotate and add text, Organize to reorder or delete pages, Merge to combine files, Split to pull out a range, Sign to draw a signature, OCR to make a scan searchable, or PDF to Word for an editable .docx.
- Make your changes and click export. The finished file lands in your Downloads folder.
No account, no email address, no watermark.
What Apple Preview cannot do
Preview is genuinely good at three things: annotating, rotating, and reordering pages. If that is all you need, use it — it is already installed.
It cannot OCR a scanned document, convert a PDF to Word, compress a file to hit an email size limit, apply Bates numbering for legal discovery, strip metadata before sharing, watermark a batch of pages, or convert Word files back to PDF.
Every one of those is a normal Tuesday task, and every one of them is what pushes Mac users towards online converters in the first place. PDF Vault covers all of them client-side.
Why offline matters more on a work Mac
A managed corporate Mac usually sits behind a data loss prevention policy that logs outbound file transfers. Uploading a contract to a free converter can be a reportable event even when the file itself comes to no harm.
Because PDF Vault processes pages with WebAssembly inside the browser sandbox, no bytes leave the machine. There is no upload to log, no retention window on someone else's storage, and no vendor employee with access to your document.
Install it as a Mac app
PDF Vault is a Progressive Web App. In Safari choose File then Add to Dock, or in Chrome click the install icon in the address bar, and it behaves like a native macOS application with its own window and Dock icon.
After the first load the whole suite is cached, so merging, splitting, signing and compressing all keep working with Wi-Fi switched off. This is genuinely useful on a plane.
The free tier, and when to upgrade
The free plan gives you three operations per day, forever, with no account. That covers most one-off jobs.
If you process documents daily, Pro removes the limit for $10 a month billed yearly — still less than half of Acrobat Pro, with no installer, no licence server, and no cloud storage attached to your files.
Bottom line
Use Preview for quick annotations. Use an offline browser-based editor like PDF Vault for everything Preview leaves out. You get Acrobat-class features at no cost, with better privacy than any online converter can structurally offer.