Released: Jul 2, 2026

Updates in v9.1.3

Fixes

• Fixed incorrect handling of Charts inside nested Shape groups when opening a Workbook.
• Fixed incorrect Sort results for in-cell Images when sorting a Range that contains Images without alternative text.
• Fixed failure to open valid XLSX Workbooks whose theme elements use a default namespace.
• Fixed incorrect black Worksheet tab color when clearing the tab color with an empty value.
• Fixed incorrect date formatting for non-English Workbook cultures in Cell text and PDF output.
• Fixed incorrect...

Released: Jun 25, 2026

Updates in v9.1.2

Fixes

• Fixed failure to open Workbook JSON when a Cell contains array information and a shared Formula reference.
• Fixed incorrect AVERAGEIF calculation results when the criteria range contains both numeric values and blank Cells and the sum range is omitted.
• Fixed incorrect Formula results when a Named Range LAMBDA returns a Range through an IFS expression for use in COUNTIFS or MAXIFS.
• Fixed unexpected unsigned satellite resource assembly included in the NuGet package.

Released: Jun 11, 2026

Updates in v9.1.1

Fixes

• Fixed issue where unable to open Workbooks containing defined name formulas that use dynamic array functions and optional LAMBDA parameters.
• Fixed unexpected recalculation of some external-link formulas when opening a Workbook, causing cached values to be replaced with #NAME? or recalculated results.
• Fixed issue where unable to parse CJK date formats in template language filter DATETIME expressions.

Released: May 5, 2026

Updates in v9.1.0

Features

• Added the IPivotTable.DisplayFieldCaptions property to allow showing or hiding field headers in pivot tables.
• Added support for exporting shape text with bullets to PDF, Image and HTML.
• Added support for exporting waterfall charts to PDF, Image and HTML.
• Added the ICellControl.SetCheckbox method to support Microsoft Excel cell checkboxes.
• Added support for NULL and empty values in template filters.
• Added support for the REGEX keyword in template filters.
• Added support for date and time...

Released: Jan 6, 2026

Updates in v9.0.0

Features

• Support Lossless of Query Table.
• Added support for new Excel functions VALUETOTEXT and ARRAYTOTEXT.
• Support controlling SharedFormula export in XLSX export.
• Support AI functions.
• Support SJS/SSJSON IO of Threaded comments.
• Performance optimization.

Fixes

• Copying a Worksheet with many formulas is very slow.
• Opening and profiling a Workbook is noticeably slower.
• Saving a Workbook to PDF can trigger a console error.
• Formatting and AutoFit on very large reports causes severe slowdowns and...

Released: Oct 15, 2025

Updates in 8.2.3

Fixes

• Conditional formatting in the sjs extLst node is not parsed, causing differences in cell text rendering compared to SpreadJS.
• Inserted shapes may be misaligned due to oversized anchor offsets exceeding column/row boundaries.
• Enabling WrapText increases row height unexpectedly from the second row when customHeight is true.
• Exporting a Range with quoted conditional formatting values causes an InvalidFormulaException during Image or PDF export.
• Shape hyperlinks are lost when exporting and...

Released: Sep 25, 2025

Updates in 8.2.2

Fixes

• File Upload cell values are lost during copy/paste or export, causing missing file names.
• Setting a data source can overwrite cell content and remove formulas.
• First update of BackgroundPicture width may be ignored after changing FontSize.
• Freeze Pane position shifts when file contains collapsed groups.
• Workbook.Calculate() may return errors if the calculation engine starts Off.
• Full-width "&" in Worksheet names change to half-width "&" in formulas after save/load.
• Upgrading can...

Released: Sep 5, 2025

Updates in 8.2.1

Fixes

• Chart axis label spacing is ignored when exporting to image, showing dense labels instead.
• Localized color tokens (e.g. [Red] in Chinese) cause number format errors or inconsistencies.
• Extra blank comment may appear in exported XLSX files (visible in WPS).
• Percentage format is lost after cell expansion.
• Setting a cell value can throw System.ArgumentException.
• Opening large .ssjson files with many styles is very slow.
• Some dynamic array formulas return incorrect results on first calculation...

Released: Aug 18, 2025

Updates in 8.2.0

Features

• Added support for Excel-like worksheet background images with full compatibility for SpreadJS SJS/SSJSON file formats. Using the IWorksheet.BackgroundPicture interface, developers can retrieve background images when they are stored in Base64 format and export them to PDF with the PrintBackgroundPicture = true option.
• Added support for new Excel functions GROUPBY, PIVOTBY, and PERCENTOF.
• Introduced the Evaluate2 API to return spilled values from dynamic array formulas.
• Added the ability...

Released: Jul 26, 2025

Updates in 8.1.5

Fixes

• When a specific file is loaded and borders are added to cells, the used range becomes incorrect.
• A workbook calculation exception occurs when a formula contains an external workbook reference.
• Unexpected file size increases when applying NumberFormat and HorizontalAlignment to entire rows or columns.
• The LET function returns a #REF! error.
• The chart does not meet expectations after data expansion.
• Issue with the HOUR formula.
• An InvalidFormulaException occurs when a LAMBDA parameter is...