Qurio Cell Viewer

User Guide (English Edition)

Qurio Cell Viewer lets you inspect and search CSV, TSV, LOG, and TXT files in a spreadsheet-style interface. It supports large files, search, split view, and LOG/TXT column splitting for efficient data analysis.

1. Getting Started

Qurio Cell Viewer displays CSV, TSV, LOG, and TXT files in a spreadsheet-style grid. The bottom pane lets you inspect long cell values and text containing line breaks, including in large files.

Search, split view, and file splitting/merging help you inspect and investigate data efficiently. Each feature is explained in the relevant chapter.

Viewer is designed for viewing and searching. It does not support editing cell values, adding or deleting rows or columns, or overwriting source files.

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2. File

Open CSV, TSV, LOG, or TXT files from the File menu or by dragging and dropping them into the application.

2.1 Open a file

Choose File → Open (Ctrl+O).
Select a CSV, TSV, LOG, or TXT file. You can also drag and drop it onto the window.
The file contents appear in the grid.

2.2 Close a file

Choose File → Close File (Ctrl+W).
The current file closes.

Search, navigation, and split-view commands requiring an open file are disabled when no file is open. File splitting and merging work independently of the currently displayed file.

For first-time loading and indexes, see Chapter 12: Large Data Mode and Indexes.

2.3 Display modes

Viewer has two display modes: Normal Mode and Large Data Mode. Normal Mode loads relatively small files into memory; Large Data Mode reads the required portions of larger files as needed.

The mode switches automatically based on the number of rows and the configured threshold. See Chapter 7 for settings and Chapter 12 for mode-specific differences.

2.4 Printing

2.4.1 Open the Print dialog

To print the open file, choose File → Print (Ctrl+P). The Print dialog contains three tabs: Basic, Layout, and Content. Use Preview to check the output before printing.

Open the CSV, TSV, LOG, or TXT file you want to print.
Choose File → Print (Ctrl+P).
Set the print range, paper layout, and content in the three tabs.
Select Preview to review the output, then Print to proceed.

2.4.2 Basic

Setting	Description
Printer	Select an available printer, including a PDF printer such as Microsoft Print to PDF.
Copies	Specify the number of copies.
Current Sheet	Print the current sheet. Be mindful of the output size for large files.
Selection	Print a selected range when this option is available. The option may be disabled.
Visible Range	Print the currently visible range.
Specified Row Range	Specify the first and last rows to print.
Portrait / Landscape	Choose portrait or landscape orientation.

2.4.3 Layout

Setting	Description
Paper Size	Choose A4 or A3 as the paper size.
Actual Size	Print using the original display scale as the basis.
Fit to One Page Wide	Scale the output to fit within one page in width.
Custom Scale	Specify a custom print scale.
Margins (Top / Bottom / Left / Right)	Set each page margin in millimeters.

2.4.4 Content

Setting	Description
Table heading — None	Do not add a table heading row.
Table heading — Use row 1 as the title row	Use the first row as the table title row.
Row Numbers	Include or exclude row numbers.
Grid Lines	Include or exclude cell grid lines.
Show header / Show footer	Show or hide the page header and footer.
Header Content	Choose File Name, Date/Time, or Custom Text. Enter text when Custom Text is selected.
Footer Content	Choose Page Number, File Name, Date/Time, or Custom Text. Enter text when Custom Text is selected.
Position	Choose Left, Center, or Right for header and footer placement.

2.4.5 Preview, print, and PDF output

Button	Action
Preview	Review the selected range, layout, and content before printing.
Print	Send the output to the selected printer.
Cancel	Close the dialog without printing.

To save as a PDF, select a PDF printer such as Microsoft Print to PDF and print to that destination. There is no separate PDF export menu.

For large files, check the print range, page count, and any limits or confirmation messages shown by the application. Printing only the required rows is recommended.

2.5 Split and merge files

These are independent file operations available from the File menu even when no file is open. They create new output files and do not modify the source.

Split a file

Choose File → Split File (Alt+Ctrl+S).
Select the CSV/TSV/LOG/TXT source file.
Specify the number of rows per output file, and check any format, encoding, and line-ending options.
Review the output folder and filename preview, then start the operation.

Merge files

Choose File → Merge Files (Alt+Ctrl+M).
Add at least two files and check or change their order. Follow the supported-format requirements shown in the dialog.
Check any header-row, encoding, and line-ending options or warnings.
Choose the output file and start merging.

For files around 100 GB, make sure enough free disk space is available. Verify the output after completion.

CSV/TSV files are split by logical records; LOG/TXT files are split by physical lines. Virtual expansion is checked when the source is selected and again when processing begins. Files with detected virtual expansion cannot be split.

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3. Edit (Selection and Copy)

The Edit menu in Viewer contains selection and copy commands that help you inspect data. It does not change cell values.

3.1 Select cells and ranges

Action	How to
Select a cell	Click the cell.
Select a continuous range	Drag from the first cell to the last.
Extend a selection	Hold `Shift` and click the end cell.
Select a row	Click its row number.
Select a column	Click its column header.
Select consecutive rows or columns	Hold `Shift` and click row numbers or column headers.
Select multiple rows or columns	Hold `Ctrl` and click row numbers or column headers.

3.2 Select all

Choose Edit → Select All (Ctrl+A), or click the upper-left corner of the grid.

3.3 Copy data

Select the cells or range to copy.
Choose Edit → Copy (Ctrl+C).
Paste the copied content into another application if needed.

Copying an excessively large selection may be rejected for safety. If this happens, select a smaller range and try again.

3.4 JSON and HTML Formatting in the Bottom Pane (Viewer)

You can format the selected cell's text for easier reading in the bottom pane. Formatting changes the display only; it does not modify the cell or source file.

Select a cell and, if necessary, choose View → Show Bottom Pane (Ctrl+B).
Right-click inside the bottom pane text area.
Choose Format JSON or Format HTML.
To return to the original text display, right-click again and choose Restore Original Display.

Command	Description
Format JSON	Parses valid JSON and displays it with indentation and line breaks. Invalid JSON is not formatted.
Format HTML	Introduces line breaks and indentation around tag boundaries. To protect text content, HTML containing `pre`, `textarea`, `script`, `style`, or `code` elements is not formatted.
Restore Original Display	Returns to the original, unformatted text display.

This is a viewing aid, not an HTML validator or repair tool. The formatted display is also cleared when you switch cells.

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4. View

The View menu controls visibility, frozen rows/columns, LOG/TXT column splitting, and zoom. These settings do not change the source file.

4.1 Show or hide interface elements

The following View menu items are checkboxes. Checked means visible; unchecked means hidden.

Item	Checked	Unchecked
Show Toolbar	Displays buttons such as Open, Copy, and Search.	Hides the toolbar to provide more space for data.
Show Status Bar	Shows status information at the bottom.	Hides the status bar.
Show Bottom Pane (`Ctrl+B`)	Shows the selected cell’s long or multiline content.	Hides the bottom pane and expands the grid.

Selecting an item again toggles it. Hiding the bottom pane never changes the data.

4.2 Freeze panes, column widths, and wrapping

Command	Description
View → Freeze → Freeze Top Row (`Ctrl+Shift+R`)	Keeps the physical first row visible, regardless of whether “Use First Row as Header” is enabled.
View → Freeze → Freeze First Column (`Ctrl+Shift+C`)	Keeps the first column visible when scrolling horizontally.
View → Freeze → Unfreeze (`Ctrl+Shift+U`)	Removes the frozen row or column.
View → Auto Fit Columns by Header (`Ctrl+Shift+H`)	Adjusts column widths to fit header text.
View → Wrap Bottom Pane (`Ctrl+Shift+W`)	Toggles line wrapping in the bottom pane.

Double-click the right edge of a column header to automatically adjust its width. Automatic row-height adjustment is available in Normal Mode; row heights remain fixed in Large Data Mode.

Freezing the first row and treating it as a header are separate settings. The header setting controls whether row 1 is used as column names. Freezing changes only the scroll behavior and does not affect row numbering or search scope.

4.3 Split LOG/TXT into columns and remove splitting

Split a LOG/TXT line into multiple columns for spreadsheet-style viewing without changing the original file. This is different from the standard CSV/TSV column display.

4.3.1 Open the dialog

Open a LOG or TXT file.
Choose View → Split Log Columns (Ctrl+Shift+L).
Select “Add Boundary” to create splitting rules, and specify the type and value of each rule.
Check the split preview and select Apply.

4.3.2 Dialog options

Option	Description
Add Boundary	Adds a splitting rule; more boundaries create more columns.
Boundary 1, Boundary 2, ...	Choose the splitting method and value for each boundary. Each can be removed.
Text	Split at a specified delimiter, such as `\|` or `,`. The delimiter is excluded from the displayed value.
Character Count	Split after a specified positive number of characters.
Set Column Headers	Enables custom column header names.
Split Preview	Shows example original and split rows; it does not modify the file.
Column Visibility Checkboxes	Hide or show each column. Hidden columns are excluded from searches.
Apply	Applies valid rules; missing or invalid conditions prevent application.
Cancel	Closes without applying changes made in the dialog.

Example: For 2026-10-26|INFO|Started, use | as the delimiter to display date/time, level, and message in separate columns. Add more boundaries as needed.

4.3.3 Change or remove splitting

To change splitting conditions or column visibility, open the splitting dialog again and select Apply. To remove splitting, choose View → Remove Log Column Split (Alt+Ctrl+L).

Removing the active split and saving the last-used conditions are separate actions. Check any restored values before applying a new rule.

4.4 Zoom in, zoom out, and reset

Menu	Shortcut	Effect
Zoom In	`Ctrl+;`	Increase the display scale.
Zoom Out	`Ctrl+-`	Decrease the display scale.
100%	`Ctrl+0`	Restore the display scale to 100%.

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5. Search

Use the search panel to find text and jump to matching cells. Searches can be limited to specific rows and can be stopped or resumed when processing large files.

5.1 Open Search

Open a file and choose Search → Search (Ctrl+F).
Choose either Selected Cell or Current Document.
Enter the search term and any conditions, then start searching.

Selected Cell searches within the currently selected cell. Current Document searches the open file. Select a cell first when using Selected Cell.

5.2 Search options

Option	Description
Match Case	Distinguishes uppercase and lowercase letters, e.g. ABC versus abc.
Match Whole Word	Matches a complete word, avoiding partial matches such as cat inside catalog.
Regular Expression	Uses a pattern. For example, `ERROR[0-9]+` matches ERROR followed by one or more digits.

Options can be combined. Regular-expression syntax affects which strings match.

5.3 Row range and header row

When Current Document is selected, search the entire file or specify a start and end row. The initial range is from the first to the last row.

If “Use First Row as Header” is enabled, row 1 is excluded from searching. When disabled, row 1 is included. Even if the start row is 1, searching begins at row 2 when the header option is enabled.

View → Freeze → Freeze Top Row only changes the display; it does not affect header treatment or search scope.

5.4 Progress and resuming

During a search, the interface shows scanned rows, matches found, elapsed time, and progress in 0.1% increments. Duration varies with file size and search range.

When a search can be resumed, New Search starts over and Resume Search continues from the previous stopping point.

5.5 Results and pagination

Matches appear in a list. Select a result to jump to its cell. Results are paginated, with up to 100 results per page. Page counts may increase as more matches are found.

When split view is active, check which pane is being navigated; each pane has its own scroll position.

5.6 Highlighting

Matching text is highlighted in the grid and bottom pane. The bottom pane is useful for long or multiline cells. Visible highlights depend on the current selection and viewport.

5.7 Cancel and resume

While searching, click Cancel Search or press Esc to stop. Matches found so far remain available. Use Resume Search to continue with unchanged conditions, or New Search after changing the term, options, or range.

Important: The match count after cancellation is not necessarily the total number of matches. Zero matches does not mean the entire file has been searched.

5.8 Clear results

When results exist and no search is running, select Clear Search Results to remove the list. Clearing is unavailable during an active search.

5.9 Navigate Between Search Results

When search results are available, press F3 to move to the next result or Shift+F3 to move to the previous result. You can review matches in sequence without clicking the results list.

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6. Navigation

Navigate to a specified row or column, or use keyboard shortcuts to move to the beginning or end of the data.

6.1 Go to Row

Action	Command
Go to Row	Search → Go to Row (`Ctrl+G`)

6.2 Go to Column

Action	Command
Go to Column	Search → Go to Column (`Ctrl+Shift+G`)

6.3 Keyboard Navigation

Action	Command
Ctrl+Home	Move to the first data row and first column.
Ctrl+End	Move to the last row and last column.
Ctrl+↑	Move to the first data row, staying in the current column.
Ctrl+↓	Move to the last row, staying in the current column.
Ctrl+←	Move to the first column, staying in the current row.
Ctrl+→	Move to the last column, staying in the current row.

6.4 Navigation Notes

These Ctrl-key navigation shortcuts do not inspect blank cells or boundaries of contiguous data. When “Use First Row as Header” is enabled, navigation to the first data row goes to row 2.

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7. Preferences

Configure display, startup behavior, cell presentation, and large-file handling.

Change preferences

Open Preferences (Alt+Ctrl+P).
Choose a category on the left.
Change the settings and select OK to save.

Default values shown below are for the English edition. Previously saved preferences may override them.

7.1 Display

Setting	Description	Default
Display Language	Choose Japanese or English.	English
Font	Choose Yu Gothic UI, Meiryo, or MS Gothic.	Yu Gothic UI
Font Size	Choose 9, 10, 11, 12, 14, 16, 18, 20, or 24.	12
Show Thousands Separators in Row/Column Numbers	Display numbers such as 1,000 without changing data.	On

7.2 Startup

Setting	Description	Default
Use First Row as Header	Use row 1 as column headers when loading.	On
Show Bottom Pane on Startup	Show the pane for long cell contents.	On
Startup Freeze Mode	Choose No Freeze, Freeze Top Row, or Freeze First Column.	Freeze Top Row

7.3 Cell View

These settings control grid display limits in Normal Mode. They do not apply in Large Data Mode, which prioritizes display performance.

Setting	Description	Default / Range
Maximum Visible Cell Lines	Maximum visible lines inside a grid cell.	6 / 1–20
Maximum Cell Height (px)	Maximum expanded cell height.	120 / 60–1,000
Maximum Cell Width (px)	Maximum expanded column width.	520 / 80–2,000

7.4 Large Data Mode

Setting	Description	Default / Range
Large Data Mode Row Threshold	Row count used to switch display modes.	50,000 / 10,000–1,000,000
Auxiliary Cache	Shows cache file count and storage usage; allows deletion of all auxiliary caches.	Depends on usage

Cache deletion requires confirmation and may be unavailable while files are open. Close files first. Deleting caches may require indexes to be rebuilt on the next load.

7.5 Recent Files

Select entries and remove them from history, or clear the entire history. Removing an entry from history does not delete the actual file.

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8. Window (Split View)

Split view lets you compare different positions in the same open file. It does not split the file itself.

8.1 Split commands

Action	Shortcut
Split Horizontally	`Alt+Ctrl+H`
Split Vertically	`Alt+Ctrl+V`
Remove Split	`Alt+Ctrl+U`

8.2 Use split view

Open a file.
Choose Window → Split Horizontally or Split Vertically.
Scroll each pane independently to compare distant locations.
Choose Window → Remove Split to return to a single pane.

Split commands are disabled when no file is open. After removing a split, check the active selection and scroll position.

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9. Updating Viewer

In the installed version of Qurio Cell Viewer, choose Help → Check for Updates to check for a newer release. Viewer also checks for updates after startup, but it never downloads or installs an update without your approval.

Choose Help → Check for Updates.
If an update is available, review the version and choose Download or Later.
Download progress is displayed. Once the download finishes, choose Quit and Update to exit Viewer and install the update, or choose Later.

An internet connection is required. Finish any file splitting, merging, or index creation before installing an update, and finish your viewing work before quitting.

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10. Menus, Toolbar, and Keyboard Shortcuts

Use this table to find the menu command, toolbar control, and shortcut for each action. A dash indicates that no corresponding toolbar button or shortcut is available.

Menu	Toolbar	Shortcut	Action
File → Open	📂 Open	`Ctrl+O`	Open CSV/TSV/LOG/TXT files
File → Close File	—	`Ctrl+W`	Close the current file
File → Print	—	`Ctrl+P`	Print data
File → Split File	—	`Alt+Ctrl+S`	Split a file
File → Merge Files	—	`Alt+Ctrl+M`	Merge files
File → Exit	—	`Alt+F4`	Exit Viewer
Edit → Copy	⧉ Copy	`Ctrl+C`	Copy selected content
Edit → Select All	—	`Ctrl+A`	Select all
View → Show Bottom Pane	—	`Ctrl+B`	Toggle the bottom pane
View → Freeze Top Row	—	`Ctrl+Shift+R`	Freeze the first row
View → Freeze First Column	—	`Ctrl+Shift+C`	Freeze the first column
View → Unfreeze	—	`Ctrl+Shift+U`	Remove freezing
View → Auto Fit Columns by Header	—	`Ctrl+Shift+H`	Fit widths to headers
View → Wrap Bottom Pane	—	`Ctrl+Shift+W`	Toggle bottom-pane wrapping
View → Split Log Columns	—	`Ctrl+Shift+L`	Configure LOG/TXT column splitting
View → Remove Log Column Split	—	`Alt+Ctrl+L`	Remove LOG/TXT column splitting
View → Zoom In	—	`Ctrl+;`	Increase zoom
View → Zoom Out	—	`Ctrl+-`	Decrease zoom
View → 100%	—	`Ctrl+0`	Reset zoom
Search → Find	🔍 Search	`Ctrl+F`	Find text
(Search results)	—	`F3`	Go to the next search result
(Search results)	—	`Shift+F3`	Go to the previous search result
Search → Go to Row	—	`Ctrl+G`	Navigate to a row
Search → Go to Column	—	`Ctrl+Shift+G`	Navigate to a column
Preferences	—	`Alt+Ctrl+P`	Open preferences
Window → Split Horizontally	🪟 Window	`Alt+Ctrl+H`	Split into top and bottom panes
Window → Split Vertically	🪟 Window	`Alt+Ctrl+V`	Split into left and right panes
Window → Remove Split	🪟 Window	`Alt+Ctrl+U`	Return to a single pane
Help → Help	—	`F1`	Open this guide
(Grid navigation)	—	`Ctrl+Home`	Move to the first data row and first column.
(Grid navigation)	—	`Ctrl+End`	Move to the last row and last column.
(Grid navigation)	—	`Ctrl+↑`	Move to the first data row, staying in the current column.
(Grid navigation)	—	`Ctrl+↓`	Move to the last row, staying in the current column.
(Grid navigation)	—	`Ctrl+←`	Move to the first column, staying in the current row.
(Grid navigation)	—	`Ctrl+→`	Move to the last column, staying in the current row.
Help → Check for Updates	—	—	Check for a new installed Viewer release
Bottom pane right-click → Format JSON	—	—	Format JSON for viewing
Bottom pane right-click → Format HTML	—	—	Format HTML for viewing
Bottom pane right-click → Restore Original Display	—	—	Return to the unformatted text

The Search and Window toolbar controls are dropdowns. Available actions depend on the file type and current application state.

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11. Troubleshooting

If an operation does not work as expected, check the relevant item below. Available features depend on the open file and the current display state.

Search or split view is disabled

Check that a file is open. These commands are unavailable when no file is open.

The first load is slow

An index may be under construction for a large file. Check the progress indicator.

Search results appear incomplete

Check whether the search was stopped. Partial match counts are not final totals.

A shortcut does not work

Try the corresponding menu command and check which window currently has keyboard focus.

Copy is rejected

The selected range may exceed safety limits. Select fewer cells and retry.

File splitting or merging does not progress

Check input format, output destination, free disk space, and whether files are in use. Keeping a separate backup of source data is recommended.

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12. Appendix: Large Data Mode and Indexes

This chapter explains large-file display and indexing. For opening and closing files, see Chapter 2.

12.1 Normal Mode versus Large Data Mode

The modes differ in how data is loaded and in certain display features. The default switch threshold is 50,000 rows and can be set between 10,000 and 1,000,000 rows.

Feature	Normal Mode	Large Data Mode
Display	Loads data for display	Loads required portions on demand
Cell selection and copy	Supported	Supported (large-copy limits apply)
Search	Supported	Supported (row ranges, cancellation, resumption, etc.)
Split view	Supported	Supported
Bottom pane	Supported	Supported
Column width adjustment	Supported	Supported
Automatic row-height adjustment	Supported	Not supported (fixed height)
Cell view preferences	Applied	Not applied
Printing	Supported	Supported (range and quantity limits apply)

When printing, follow the on-screen guidance about ranges and output limits.

Neither mode supports editing cells, inserting or deleting rows or columns, or overwriting the original file.

12.2 Indexes and loading time

Large Data Mode uses an index to retrieve the portions of the file needed for display. Building the index on the first open can take time. Subsequent opens may be faster if the index can be reused.

12.3 Important notes

Wait for index creation to finish; do not remove source files or related caches while processing.
Processing time depends on file size, row count, line length, disk speed, and other conditions.
A 100 GB file is not guaranteed to open or search quickly. Verify performance in your own environment.

When comparing first and second load times, use the same file and the same PC.

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