DeskDazzle reads and writes the same .docx, .xlsx and .pptx files Microsoft Office does, in a browser tab, with no subscription and no account. It is a smaller product than Office and does not pretend otherwise — what it replaces is the everyday case of opening, editing and sending a document.
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Questions
Is DeskDazzle a full replacement for Microsoft Office?
For everyday document, spreadsheet and slide work, it does the job with no licence. It is not a replacement if you depend on co-authoring, track changes, pivot tables or macros — those are Office features it does not have.
Can it open files made in Office?
Yes. It reads .docx, .xlsx, .xls, .ods, .csv and writes .docx, .xlsx, .csv and .pptx, all on your device, with no conversion service in between.
Is it really free, or is there a paid tier later?
Free, with no paid tier and no trial. There is no application server behind it, so there is no per-seat cost to recover.