Changelog

[3.4.3] - May 6, 2026

fix(pptx): fix ArgumentNullException in FluentPresentationBuilder when slides have null data (#256)
fix(word): rely on SDK 3.x built-in handling for invalid hyperlink URIs — removes manual UriFixer patching (#253)
perf: replace LINQ char filter with ReplaceLineEndings in FlatOpc.ToPackage (#250)
chore(deps): update TUnit 1.41.0 → 1.43.11 (#254)

[3.4.2] - April 30, 2026

fix(pptx): make all part copies resilient to corrupt ZIP local file headers (#234)
refactor: replace ContainsKey+indexer double-lookups with TryGetValue (#246)
refactor(excel): remove dead code from SpreadsheetDocumentManager + add WorksheetAccessor unit tests (#247)
refactor: modernize UriFixer — convenience overload, leaveOpen param, eliminate test duplication (#237)
refactor: modernise random/guid usage, fix discarded Guid bug, and remove dead code (#244)
test(excel): add SmlDataRetriever unit tests (SDR001–SDR025) (#236)
chore(deps): update TUnit 1.37.10 → 1.40.10 (#235, #242, #243, #245)

[3.4.1] - April 23, 2026

fix: resolve ArgumentException for slides with custData+CustomXmlProperties (#232)
refactor: replace generic Exception with specific exception types (#228)
perf: eliminate redundant allocations in MakeValidXml and AddIfMissing (#229)
ci: add NuGet publish workflow triggered by version tags (#227)
test: add unit tests for Base64.ChunkBase64 and ConvertFromBase64 (#230)
chore(deps): update TUnit 1.37.0 → 1.37.10 (#222)

[3.4.0] - April 19, 2026

feat: add Optional="true" support to <Table> directive in DocumentAssembler (#150)
feat: add FitWithin image sizing mode to DocumentAssembler (#168)
feat: add RelationshipValidator to detect dangling r:id references in OpenXml parts (#160)
feat: extract shared RomanNumeralUtil with ToUpperRoman/ToLowerRoman helpers (#164)
feat(html): render floating tables (w:tblpPr) with CSS float in WmlToHtmlConverter (#180)
fix(word): correct Russian list item text for values ≥ 100 (#187)
fix(word): guard cardinalText/ordinalText against out-of-range levelNumber in multiple locales (#200, #201, #208)
fix(html): render DOCX text boxes as inline-block divs in WmlToHtmlConverter (#166)
perf(pptx): single-pass dispatch in CopyRelatedPartsForContentParts + lazy SaveAndCleanup (#175)
perf(pptx): avoid OuterXml→Parse roundtrip in SlidePartData.GetShapeDescriptor (#178)
perf: convert Regex instances to source-generated [GeneratedRegex] in several modules (#196)
perf(comparer): reduce heap allocations in WmlComparerUtil SHA-1 hashing (#199)
perf: modernize SHA1/SHA256 hashing — use SHA1.HashData(), SHA256.HashData(), Convert.ToHexString() (#184)
perf: eliminate per-character heap allocations in base64 chunking (FlatOpc / Base64) (#209)
refactor: remove custom relationship ID generator — delegate to OpenXML SDK APIs (#161)
refactor: simplify LINQ patterns across Excel, Word, and Html modules (#207)
docs: improve README with NuGet badges, project overview, quick-start, and docs link (#183)
docs: switch DocFX documentation site to modern Bootstrap-based theme (#211)
test(word): add unit tests for ListItemTextGetter_Default, fr_FR, sv_SE, zh_CN, tr_TR, ru_RU locales (#198, #206)
test(word): add MS004–MS009 for MarkupSimplifier settings coverage (#213)
test(excel): add ParseFormula and XlsxTables cell-address utility tests (#169, #185)
test(common): add TextReplacer unit tests (#167)

[3.3.1] - March 24, 2026

fix: handle dangling r:id on p:oleObj/p:externalData — KeyNotFoundException in slide publishing (#156)
fix: resolve Content directives in v:textpath/@string for VML watermarks (#141)

[3.3.0] - March 22, 2026

fix: prevent malformed XLSX when worksheet has no data rows (#108)
fix: use min-width for tab-preceding span to prevent text overflow (#110)
fix: update docProps/app.xml metadata in PublishSlides output (#114)
fix: update numFmts count attribute when adding custom number formats (#124)
fix: custom numFmt IDs must start at 164 per ECMA-376 (#131)
fix: TextReplacer.CloneWithAnnotation now returns the clone, not the original (#135)
perf: O(1) dictionary lookup for media deduplication cache in FluentPresentationBuilder (#128)
perf: cache next slide ID in FluentPresentationBuilder to avoid O(n²) scan (#140)
perf: cache compiled Regex, use Any() over Count() == 0, use Element() over Elements().First() (#143)
refactor: modernise assembler helper classes (#118)
refactor: modernize DocumentAssembler.cs with collection expressions and catch cleanup (#138)
hk: DocumentFormat.OpenXml 3.5.1, TUnit 1.20.0 (#146)
hk: Modernize CI workflow and update dependencies (#121)

[3.2.0] - January 25, 2026

hk: DocumentFormat.OpenXml 3.4.1

[3.1.0] - August 30, 2025

Build with .NET 10.0 and provide .NET 8 & 10 binaries (#106)

[3.0.2] - August 30, 2025

Extends DocumentAssembler to also apply HTML formatting on content in table cells (#101)

[3.0.1] - July 30, 2025

fix: incorrect insertion of sldLayoutIdLst element for SlideMaster (#100)

[3.0.0] - June 30, 2025

Public exposure of IFluentPresentationBuilder ergonomic API for the code behind PresentationBuilder

[2.5.2] - June 28, 2025

fix: relationship of theme parts (#99)

[2.5.1] - March 30, 2025

Issue 95 and other issues #96 by @MalcolmJohnston
hk: DocumentFormat.OpenXml 3.3.0

[2.5.0] - February 7, 2025

Insert Documents or Document Templates using Document Assembler #93 by @MalcolmJohnston

[2.4.2] - January 15, 2025

fix: Font Sizing Font Styling and Font Coloring is not working #94
hk: dependencies update

[2.4.1] - January 4, 2025

fix: Bug fix/document assembler paragraph properties not copied from template #91
fix: slide naming issues during publishing presentation with *.potx extension
hk: Migration to xUnit.v3

[2.4.0] - December 8, 2024

feat: Added support for HTML fragments in Document Assembler Content tag (#86)

[2.3.0] - November 23, 2024

hk: build with .NET 9.0
hk: DocumentFormat.OpenXml 3.2.0
hk: Pack with dotnet pack instead of paket
feat: handle invalid xml characters (#89)

[2.2.2] - November 1, 2024

feat: DocumentFormat.OpenXml 3.1.0 -> 3.1.1
docs: Fix document assembler images and other tidy up (#84)
hk: Document Assembler - Small Code Reorganisation (#83)

[2.2.1] - October 8, 2024

fix: optimized memory usage during slide publishing

[2.2.0] - September 8, 2024

DocumentFormat.OpenXml 3.0.2 -> 3.1.0
DocumentFormat.OpenXml.Framework 3.0.2 -> 3.1.0
SixLabors.ImageSharp 3.1.4 -> 3.1.5
SixLabors.ImageSharp.Drawing 2.1.3 -> 2.1.4

[2.1.1] - April 18, 2024

fix: regression cased by migration to struct inside OpenXML v3 #75
Dependencies updated

[2.1.0] - Mar 18, 2024

Migration to .NET 8.0

[2.0.1] - Jan 16, 2024

Fix regression cased by migration to struct inside OpenXML v3
DocumentFormat.OpenXml 3.0 -> 3.0.1
SixLabors.Fonts 2.0 -> 2.0.1
SixLabors.ImageSharp 3.0.2 -> 3.1.2
SixLabors.ImageSharp.Drawing 2.0.1 -> 2.1.0

[2.0.0] - Nov 26, 2023

Migration to .NET 6.0
DocumentFormat.OpenXml 3.0.0-beta0003
System.Drawing.Common replaced by SixLabors.ImageSharp.Drawing`
Removed libgdiplus dependency
Drop old WmlComparer

[1.13.5] - Mar 27, 2023

perf: improved PublishSlides perf #61

[1.13.4] - Dec 6, 2022

fix: issues with 7.0 packages

[1.13.3] - Dec 5, 2022

fix: PublishSlides: missing ppt/metadata for google presentations #59
Dependencies updated

[1.13.2] - Oct 4, 2022

remove caracters to prevent > at document assembler #57
Handle W.lastRenderedPageBreak in UnicodeMapper #58

[1.13.1] - Sept 27, 2022

long overload for Cell.Number

[1.13.0] - Sept 27, 2022

DocumentFormat.OpenXml (2.18)
Added Cell.Bool for Excel helpers

[1.12.2] - Jul 13, 2022

fix: PtOpenXmlUtil: process corrupted OpenXmlPart items #56

[1.12.1] - Jul 11, 2022

DocumentFormat.OpenXml (2.17.1)

[1.12.0] - Jun 2, 2022

Static Cell builder class for simpler and safer Excel generation
Auto new modified date for decks composed with PresentationBuilder

[1.11.0] - May 29, 2022

PublishSlides: reduced memory consumption #53

[1.10.2] - Mar 16, 2022

DocumentFormat.OpenXml (2.16.0)
Lock System.Drawing.Common version to v5

[1.10.0] - Feb 19, 2022

Added support of ExtendedChartPart (http://schemas.microsoft.com/office/drawing/2014/chartex) in PresentationBuilder and DocumentBuilder.

[1.9.2] - Feb 17, 2022

Fix: Don't show hidden slides after PresentationBuilder.BuildPresentation

[1.9.1] - Feb 9, 2022

Fixed incorrect usage of Stream API

[1.9.0] - Jan 28, 2022

DocumentFormat.OpenXml (2.15.0)

[1.8.2] - Dec 16, 2021

Improved memory consumption for PresentationBuilder.PublishSlides #44 by @f1nzer
Revert DocumentFormat.OpenXml back to 2.13.1 (because of this issue)

[1.8.1] - Nov 5, 2021

DocumentFormat.OpenXml (2.14.0)

[1.8.0] - Oct 25, 2021

DocumentAssembler: Support for multi-value XPath results #39

[1.7.3] - Oct 7, 2021

Fixed copy Chart Style Parts in FluentPresentationBuilder

[1.7.2] - Aug 23, 2021

DocumentFormat.OpenXml v2.13.1

[1.7.1] - Aug 18, 2021

Resolving bug with nested rowspans #35

[1.7.0] - Aug 15, 2021

DocumentAssembler: Support for images #31

[1.6.1] - Jul 11, 2021

New docs site generated by DocFx #33
Tests suite cleanup, samples converted to tests #32

[1.6.0] - Jul 3, 2021

Add WorkbookDfn.WriteTo(Stream) method #29
Fixed generation of multiple Excel tables
Fixed formatting of cells with DateTime

[1.5.0] - Jun 26, 2021

Structural comparison for Theme, Master, Layout #20
Auto-scaling for slides from presentations with different slide size
DocumentFormat.OpenXml (2.13)
System.Drawing.Common (5.0.2)

[1.4.0] - Feb 10, 2021

DocumentBuilder: Added ISource and TableCellSource - #17
DocumentFormat.OpenXml (2.12.1)
Added dependency on System.IO.Packaging
Fixed DateTime/DateTimeOffset serialisation format to Excel

[1.3.1] - July 30, 2020

PresentationBuilder: Fixed CopyExtendedPart

[1.3.0] - July 29, 2020

DocumentFormat.OpenXml (2.11.3)
PresentationBuilder: Bug Fixes #16

[1.2.1] - May 2, 2020

HTML to WML: Allow font-size with unit rem #13

[1.2.0] - March 12, 2020

DocumentFormat.OpenXml (2.10.1)

[1.1.4] - December 6, 2019

Slide title extracted and saved to document title #10
Ensured that Modified date is propagated
Compiled and tested on .NET Core 3.1 #9

[1.1.3] - December 3, 2019

Don't rename theme when we extract slides from auto-generated 1-layout master

[1.1.2] - December 2, 2019

Bug fixes

[1.1.1] - December 1, 2019

Extract and merge presentation without slides (only masters) #5

[1.1.0] - November 29, 2019

Added Slide Publishing API #2

[1.0.0] - November 21, 2019

Initial release: latest version of OpenXmlPowerTools

Table of Contents

Changelog

[3.4.3] - May 6, 2026

[3.4.2] - April 30, 2026

[3.4.1] - April 23, 2026

[3.4.0] - April 19, 2026

[3.3.1] - March 24, 2026

[3.3.0] - March 22, 2026

[3.2.0] - January 25, 2026

[3.1.0] - August 30, 2025

[3.0.2] - August 30, 2025

[3.0.1] - July 30, 2025

[3.0.0] - June 30, 2025

[2.5.2] - June 28, 2025

[2.5.1] - March 30, 2025

[2.5.0] - February 7, 2025

[2.4.2] - January 15, 2025

[2.4.1] - January 4, 2025

[2.4.0] - December 8, 2024

[2.3.0] - November 23, 2024

[2.2.2] - November 1, 2024

[2.2.1] - October 8, 2024

[2.2.0] - September 8, 2024

[2.1.1] - April 18, 2024

[2.1.0] - Mar 18, 2024

[2.0.1] - Jan 16, 2024

[2.0.0] - Nov 26, 2023

[1.13.5] - Mar 27, 2023

[1.13.4] - Dec 6, 2022

[1.13.3] - Dec 5, 2022

[1.13.2] - Oct 4, 2022

[1.13.1] - Sept 27, 2022

[1.13.0] - Sept 27, 2022

[1.12.2] - Jul 13, 2022

[1.12.1] - Jul 11, 2022

[1.12.0] - Jun 2, 2022

[1.11.0] - May 29, 2022

[1.10.2] - Mar 16, 2022

[1.10.0] - Feb 19, 2022

[1.9.2] - Feb 17, 2022

[1.9.1] - Feb 9, 2022

[1.9.0] - Jan 28, 2022

[1.8.2] - Dec 16, 2021

[1.8.1] - Nov 5, 2021

[1.8.0] - Oct 25, 2021

[1.7.3] - Oct 7, 2021

[1.7.2] - Aug 23, 2021

[1.7.1] - Aug 18, 2021

[1.7.0] - Aug 15, 2021

[1.6.1] - Jul 11, 2021

[1.6.0] - Jul 3, 2021

[1.5.0] - Jun 26, 2021

[1.4.0] - Feb 10, 2021

[1.3.1] - July 30, 2020

[1.3.0] - July 29, 2020

[1.2.1] - May 2, 2020

[1.2.0] - March 12, 2020

[1.1.4] - December 6, 2019

[1.1.3] - December 3, 2019

[1.1.2] - December 2, 2019

[1.1.1] - December 1, 2019

[1.1.0] - November 29, 2019

[1.0.0] - November 21, 2019