nissl-lab

Issues somebody may already be working on are listed last. List everything by date

• AutoSizeColumn produces narrower columns since 2.8.0 (SkiaSharp migration): long text gets clipped

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 45/100

  nissl-lab/npoi#1893 · Opened Oct 13, 2026

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• Investigation on IronOCR

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  Difficulty 5/5 Over a week Newbie friendliness 20/100

  nissl-lab/toxy#108 · Opened Oct 7, 2026

• NPOI 2.8.1 fails to load due to missing SkiaSharp 3.119.0 assembly

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  bug cicd

  Difficulty 3/5 1-2 days Newbie friendliness 65/100

  nissl-lab/npoi#1877 · 4 comments · Opened Sep 26, 2026

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• Investigation on IronPDF

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  nissl-lab/toxy#107 · 3 comments · Opened Sep 25, 2026

• Excel Function Implementation IV

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  nissl-lab/npoi#1873 · Opened Sep 22, 2026

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• Infinite loop on a malformed .xls whose declared stream size exceeds its block chain

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  bug hssf security

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  nissl-lab/npoi#1844 · 3 comments · Opened Aug 16, 2026

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• Dependency on SkiaSharp 3.119.2 massively bloats package size.

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  cicd need-investigation

  Difficulty 2/5 1-3 hours Newbie friendliness 72/100

  nissl-lab/npoi#1836 · 7 comments · 1 reaction · Opened Aug 3, 2026

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• net472: strong-named NPOI.Core cannot load unsigned ExcelFinancialFunctions — all financial functions throw FileLoadException

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  cicd formula

  Difficulty 5/5 Over a week Newbie friendliness 38/100

  nissl-lab/npoi#1830 · 2 comments · Opened Jul 30, 2026

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• NPOI.POIFS.FileSystem.NotOLE2FileException: Invalid header signature; read 0x0000000000000000, expected 0xE11AB1A1E011CFD0

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  bug hssf

  Difficulty 3/5 1-2 days Newbie friendliness 68/100

  nissl-lab/npoi#1818 · Opened Jun 5, 2026

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• RTF Metadata Support

  May be free again @Flamifly claimed this 150 days ago, and no pull request is open. Open

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  enhancement

  nissl-lab/toxy#103 · 1 comment · 1 assignee · Opened Jun 2, 2026

• Support for extending the service with custom parsers

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  enhancement

  Difficulty 5/5 Over a week Newbie friendliness 35/100

  nissl-lab/toxy#102 · Opened May 31, 2026

• Create F# Type Provider for Toxy

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  Difficulty 5/5 Over a week Newbie friendliness 30/100

  nissl-lab/toxy#96 · Opened Apr 18, 2026

• Extract Table from Email

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  enhancement

  Difficulty 3/5 1-2 days Newbie friendliness 52/100

  nissl-lab/toxy#91 · 1 comment · Opened Mar 31, 2026

• Using Stream internally for parsing

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  enhancement question

  Difficulty 5/5 Over a week Newbie friendliness 28/100

  nissl-lab/toxy#90 · 10 comments · Opened Mar 29, 2026

• Toxy Promotion Plan

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  Difficulty 5/5 Over a week Newbie friendliness 30/100

  nissl-lab/toxy#87 · 11 comments · Opened Mar 27, 2026

• EML Extraction Support

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  enhancement

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/toxy#77 · 18 comments · Opened Mar 21, 2026

• Create Claude Skill for Toxy

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  enhancement

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  nissl-lab/toxy#75 · Opened Mar 19, 2026

• XWPF Chart Implementation (Word Chart support)

  May be free again @tonyqus claimed this 231 days ago, and no pull request is open. Open

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  nissl-lab/npoi#1732 · 1 assignee · Opened Mar 13, 2026

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• Open Document support

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  Difficulty 4/5 3-5 days Newbie friendliness 55/100

  nissl-lab/toxy#69 · 10 comments · Opened Mar 13, 2026

• Discussion about System.Text.Xml

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  msft Research

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  nissl-lab/toxy#68 · 15 comments · Opened Mar 12, 2026

• AltChunk containing docx file corrupts document

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  enhancement xwpf

  Difficulty 3/5 1-2 days Newbie friendliness 50/100

  nissl-lab/npoi#1670 · 2 comments · Opened Jan 16, 2026

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• Stacked Column Chart not currently supported?

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  question

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  nissl-lab/npoi#1648 · Opened Oct 15, 2025

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• sheet.ShiftRows throws System.InvalidOperationException:“Cannot add merged region B3:C3 to sheet because it overlaps with an existing merged region (B3:C3).”

  May be free again @antony-liu claimed this 269 days ago, and no pull request is open. Open

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  bug xssf

  nissl-lab/npoi#1646 · 3 comments · 1 assignee · Opened Oct 11, 2025

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• `sheet.CopyTo` is not copying the style properly.

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  bug xssf

  Difficulty 3/5 1-2 days Newbie friendliness 42/100

  nissl-lab/npoi#1586 · 4 comments · Opened Jun 12, 2025

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• Color of legend does not match the color of column in chart if custom colors are used for each column

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  chart need-investigation xssf

  Difficulty 3/5 1-2 days Newbie friendliness 42/100

  nissl-lab/npoi#1582 · Opened Jun 6, 2025

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• Corrupted after calling ShiftRows function to remove the row where the shared formula is defined

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  need-investigation xssf

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  nissl-lab/npoi#1490 · Opened Feb 14, 2025

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• Unable to Evaluate Formula while referencing an external workbook

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  formula need-investigation xssf

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#1442 · 6 comments · Opened Nov 11, 2024

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• Adding rows of data into existing xlsx file with pivot tables and charts result with unusable file.

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  bug file_error xssf

  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  nissl-lab/npoi#1293 · 7 comments · Opened Mar 13, 2024

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• Support DOCM file type

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  enhancement help-wanted xwpf

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#1250 · 2 comments · Opened Jan 11, 2024

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• Dropdown support

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  enhancement help-wanted vba xwpf

  Difficulty 3/5 1-2 days Newbie friendliness 45/100

  nissl-lab/npoi#1243 · Opened Dec 21, 2023

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• A built-in way to validate a cell value based on Excel data validation constraints?

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  question xssf

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#1231 · 3 comments · 1 reaction · Opened Dec 3, 2023

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• Unable to Generate Excel from a template with Pivot & Filters

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  bug file_error xssf

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#1201 · 5 comments · Opened Oct 23, 2023

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• How can I reaplce text in word document include image?

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  enhancement help-wanted xwpf

  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  nissl-lab/npoi#1169 · Opened Aug 23, 2023

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• Error with filters on a pivot table causes a corrupt sheet and memory error

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  bug file_error xssf

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#1155 · 6 comments · Opened Aug 11, 2023

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• MoveCell is not implemented in XSSF

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  enhancement help-wanted xssf

  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  nissl-lab/npoi#1113 · 2 comments · Opened Jul 4, 2023

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• ShiftRows breaks the height of the underlying rows

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  hssf need-investigation xssf

  Difficulty 4/5 3-5 days Newbie friendliness 20/100

  nissl-lab/npoi#1039 · Opened Mar 7, 2023

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• Support async-only streams

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  api enhancement help-wanted

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#1021 · 4 comments · 1 reaction · Opened Feb 24, 2023

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• Custom color

  May be free again A pull request for this issue was closed without being merged. Open

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  enhancement help-wanted xssf

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#979 · 1 comment · Opened Dec 17, 2022

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• Performance issue when adding copied rows

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  help-wanted need-investigation performance xwpf

  Difficulty 4/5 3-5 days Newbie friendliness 32/100

  nissl-lab/npoi#975 · 1 comment · Opened Dec 5, 2022

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• Open an existing xlsx file. If LastRowNum is 15, add a picture on line 16 .IPicture Resize() method locks application execution

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  need-investigation

  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  nissl-lab/npoi#952 · 1 comment · Opened Nov 5, 2022

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• NPOI having issues evaluating cascade formulas (formula cells referencing other formula cells)

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  need-investigation

  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  nissl-lab/npoi#914 · 7 comments · Opened Aug 19, 2022

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• XSSF ShiftRows cause shared formula mismatch.

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  need-investigation

  Difficulty 4/5 3-5 days Newbie friendliness 38/100

  nissl-lab/npoi#901 · 3 comments · Opened Aug 5, 2022

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• Column Groups Collapsed on Column Sizing

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  need-investigation

  Difficulty 3/5 1-2 days Newbie friendliness 42/100

  nissl-lab/npoi#822 · Opened Apr 28, 2022

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• Cell color info is not correct. How to get correct info?

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  bug help-wanted need-investigation

  Difficulty 3/5 1-2 days Newbie friendliness 35/100

  nissl-lab/npoi#820 · 6 comments · Opened Apr 27, 2022

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• Combine the paragraphs and table contens of two docx with NPOI

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  enhancement xwpf

  Difficulty 5/5 Over a week Newbie friendliness 20/100

  nissl-lab/npoi#773 · 3 comments · Opened Mar 11, 2022

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• Append or Insert an embeded file into word file

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  enhancement xwpf

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  nissl-lab/npoi#755 · 2 comments · Opened Feb 17, 2022

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• Cell address in shapes was removed when I create a new Excel file by using XSSFWorkbook

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  bug file_error

  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  nissl-lab/npoi#717 · 3 comments · Opened Dec 22, 2021

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• WriteProtectWorkbook record in HSSFWorkbook doesn't work

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  bug hssf

  Difficulty 3/5 1-2 days Newbie friendliness 35/100

  nissl-lab/npoi#716 · 1 comment · Opened Dec 18, 2021

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• Export/Convert Excel to PDF

  May be free again @Bykiev claimed this 515 days ago, and no pull request is open. Open

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  Commercial enhancement

  nissl-lab/npoi#667 · 15 comments · 1 assignee · Opened Oct 8, 2021

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• Dynamic array support in NPOI

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  enhancement formula help-wanted

  Difficulty 5/5 Over a week Newbie friendliness 25/100

  nissl-lab/npoi#663 · 1 comment · Opened Sep 27, 2021

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