MoDocs

byPsychopath · Tools

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8.0

android

AI summary

Lightweight document viewer and editor for PDF, DOCX, XLSX, and PPTX files. Fill and sign PDF forms, edit spreadsheet cells, and view Word documents and presentations. Open-source under MIT license. Version 1.74 improves handling of damaged Office files, fixes PDF encryption bugs, and adds safeguards for large files.

Generated by AI. May contain inaccuracies.

About this app

Mobile Documents — a lightweight Android app for viewing and working with documents on your phone.

Features

- PDF — View, search, fill forms (tap to place text, signatures, checkmarks, dates), drag to reposition, adjust font sizes, and save filled copies - DOCX — View Word documents with formatting, images, tables (borders, merged cells, column widths), and basic layout - XLSX — View and edit spreadsheet cells, save changes - PPTX — View presentations with text, shapes, images, and backgrounds

Known Limitations

DOCX

- Documents won't show up exactly how they look in Word, especially if they use complicated features like nested tables or unusual spacing/positioning. For heavy Word editing, use the real thing.

XLSX

- No formula support — formulas are not evaluated, only their last cached values are shown - Editing is limited to viewing and modifying cell values (no formatting changes, no inserting rows/columns)

PPTX

- This is the least baked feature (because it's very rare I open a PPT on my phone) - Complex graphics, SmartArt, charts, and animations will not render - No editing support for presentations — just viewing - If you need to do a lot of presentation editing on mobile, just get Microsoft Office

PDF

- Fill & sign flattens annotations onto a re-rendered copy of the PDF (not a direct edit of the original file structure) - Very large PDFs may be slow to save

License

MIT

document viewer pdf editor office open source offline

What's new

v1.74Aug 29, 2026

Office Documents
Spreadsheets, documents, and presentations with a UTF-8 BOM now open correctly — fixes files from ClosedXML and .NET OpenXML SDK that previously failed with a "PI must not start with xml" error. - Damaged files now degrade gracefully: broken styles, relationships, or shared-strings may affect formatting but no longer break the whole file; unreadable sheets or slides are skipped. - Password-protected documents are no longer silently unprotected. In-place save is blocked with a prompt to use Save As, which clearly indicates the copy will be unprotected.
PDF Fixes
Corrupt encrypted PDFs no longer loop indefinitely on "Incorrect password". - PDFs with expired permission grants now show an access error instead of a password prompt. - Pages with extreme aspect ratios no longer risk memory exhaustion when saving a filled copy. - Text search is skipped on PDFs over 32 MB to prevent memory issues (viewing and fill & sign are unaffected). - Fixed a file-descriptor leak when opening a PDF failed.
Other
Search in Word documents now highlights only the current match instead of all matches on the page. - Unrecognized file types now report "unsupported" rather than opening as a PDF. - Recents database is excluded from cloud backup and device transfer. - Decrypted copies of protected PDFs are cleared from the cache on startup.