SumOffice opens your office files from Google Drive™ exactly as they were made: formulas, charts, pivot tables, tracked changes, comments, footnotes, slide layouts and animations stay intact.

How it works
1. In Google Drive™, right-click a .docx, .xlsx, .xlsm, .xlsb or .pptx file and choose Open with > SumOffice.
2. The file opens in SumDoc, SumSheet or SumSlide in your browser. Nothing to install.
3. Edit as usual. Every save is written back to the same Google Drive™ file as a new revision, so Google Drive™ version history keeps working.

Why SumOffice
- Desktop-class editors: ribbon, styles, track changes, comments, conditional formatting, hundreds of spreadsheet functions; macros run safely in the browser.
- Your file stays in your Google Drive™. We only ask for access to the files you open with SumOffice (drive.file), never to the rest of your Google Drive™.
- Your Google tokens are kept only in our server memory and never reach the browser. The working copy is deleted when your editing session ends.
- Hosted in the EU (Frankfurt). No ads, no selling of data, no AI training on your files.

Who it is for
Accountants, lawyers, teachers, students and teams who receive office files from clients and partners and need to open and return them without losing formatting.

SumOffice is made by HEALTH INFORMATIC SECURITY SYSTEM, S.L. (Spain). Questions: hello@sumoffice.com

Google Drive™ is a trademark of Google LLC. SumOffice is not affiliated with or endorsed by Google LLC.