Fubako User Guide

Everything Fubako (文箱) does, on one page. The basic flow: open a PDF → work with the page sidebar and toolbar → save or export.

Opening PDFs

• Drag & drop a PDF onto Fubako, or use File > Open
• Multiple PDFs open in separate windows (switch via the Window menu)
• Password-protected PDFs prompt for the password on open

The layout

A page sidebar (thumbnails) on the left, the viewer on the right. All page operations happen in the sidebar; the right pane is for reading, scrolling, and zooming.

Reorder, delete, rotate, extract pages

• Select: click; ⌘-click to add, ⇧-click for a range
• Reorder: drag thumbnails
• Delete: select and press delete
• Rotate / extract: right-click menu; extract writes the selected pages to a new PDF
• Everything is undoable with ⌘Z

Merging (inserting another PDF)

Drag PDF files into the page sidebar — all their pages are inserted where you drop them. Multiple files at once is fine.

Splitting

File > Split performs a bulk one-file-per-page split. If you only need certain pages, select them and right-click → extract.

Make a scanned PDF searchable (OCR)

• Click "Make Searchable" in the toolbar — every page is OCR'd and an invisible text layer is embedded
• The page looks unchanged, but ⌘F search, text copying, and Spotlight indexing start working
• This modifies the open document and autosaves; revert anytime via File > Revert To

Compression

• Toolbar Compress → choose quality (High / Standard / Smallest) → pick a destination
• The result is shown like "2.4 MB → 380 KB (-84%)". Your original file is untouched
• If a PDF can't shrink, Fubako says so and never degrades it for nothing

Watermarks & page numbers

• Toolbar watermark button → pick text (presets like CONFIDENTIAL / COPY / DRAFT, or your own) and optional page numbers
• "Export with Watermark…" writes a watermarked copy; the open document stays unchanged
• Watermarks are baked into the page — not selectable text, and not removable with a click

Export (PDF / Excel)

• ⇧⌘E or the Export button → PDF (choose quality) or Excel (.xlsx)
• Excel conversion handles ruled tables (macOS 26+); choose a single mirrored sheet or one sheet per table

Saving and reverting

• Page edits and OCR participate in macOS autosave; ⌘S and Save As also work
• To go back in time, use File > Revert To (standard macOS Versions)
• Operations that would void encryption or digital signatures show a warning first

Keyboard shortcuts

Troubleshooting