Open a Mariner Write document
Plenty of Mac users in the late 1990s chose Mariner Write precisely because it wasn’t Microsoft Word — it was small, fast, and stayed out of the way. If you’re now sitting on documents from that era, perhaps from a parent’s old iMac or a PowerBook found in a closet, this tool will open them for you. Drag a file in and it’s converted right here in your browser into a .odt file (readable by Word, LibreOffice, and Pages), plain text, or an on-screen preview. The whole converter is about 2MB, loads on first use, and afterward works even without an internet connection. Because the work happens on your own computer, your documents are never uploaded, and the originals are never touched or altered — you keep the untouched source files for your records.
About Mariner Write
Mariner Write arrived in 1996 from Mariner Software, a small Minneapolis company, at a moment when Microsoft Word had grown into something many Mac users found bloated and slow. Mariner Write was the antidote: a lean, genuinely Mac-like word processor that launched in seconds, handled styles, headers, footnotes, and tables competently, and cost far less than an Office license. It found a loyal audience among writers, teachers, and anyone whose aging Mac couldn’t comfortably run the big suites, and it was frequently bundled with new Macs and sold alongside its spreadsheet sibling, Mariner Calc. The program successfully made the jump to Mac OS X and lived on for years, but the classic-era versions used their own binary format that modern software — including later Mariner releases on new systems — can’t reliably read. Those classic-format files are what this page handles, using libmwaw from the Document Liberation Project, the same filters that give LibreOffice its knowledge of old Mac formats.
Frequently asked questions
Are my files private when I use this?
Completely. The converter runs as WebAssembly inside your browser, so your document is processed on your own machine and never uploaded. There is no server-side conversion, no queue, and no copy retained anywhere.
The file has no extension and I’m not sure it’s Mariner Write. Should I try anyway?
Yes — just drop it in. Detection is automatic and based on the file’s internal contents, so extensions don’t matter. If the file turns out to be a different classic Mac format the tool supports, it will convert that instead.
What will the converted document look like in Word?
The output is a .odt file that opens directly in Word, LibreOffice, or Pages. Character and paragraph formatting, headers, and footnotes are preserved wherever the original file allows them to be recovered.
Which versions of Mariner Write does this cover?
The classic Mac OS versions — the ones from roughly 1996 through the early 2000s whose files won’t open anywhere today. If you have a newer document from the Mac OS X era, the current Mariner software or an .rtf export may serve you better.