WinMerge 2.16.55 Beta Release Notes

• About This Release
• What Is New in 2.16.55 beta?
• Known issues

April 2026

About This Release

This is a WinMerge beta release which is meant for preview the current state of
WinMerge development. This release is not recommended for the production.

Please submit bug reports to our bug-tracker.

What Is New in 2.16.55 Beta

General

• Fix incorrect GetAsyncKeyState usage for modifier key detection (PR #3257)

• Update POCO C++ Libraries to 1.15.1 (PR #3292)

File compare

• BugFix: Fix keyboard input issue after Alt+mouse operations (PR #3254)

• BugFix: Register self-compare in MRU and refactor command line parameter
  buil… (PR #3266)

• Refactor save confirmation logic using SaveClosingDlg::ShowAndSave
  (PR #3256)

• Enable IME text reconversion in editor view (PR #3214)

Image compare

• BugFix: Fix crash caused by OnClose being called twice in image compare
  window (PR #3255)

• Speedup image comparision slider during WipeEffect (PR winimerge/#33)

Folder compare

• BugFix: Fix an issue where skipped items were not properly filtered during
  folder/file comparison. (PR #3267)

• BugFix: Fix potential hang in DiffWorker shutdown (PR #3300)

• Extend “Merge renamed items” option to support moved items (PR #3181)

• Refactor compare engines to use DiffContext (PR #3197)

• Refactor compare engines to write results into DIFFITEM and add
  FullQuickCompare (PR #3201)

• Add e:/e!: filter prefixes for files and directories (PR #3205)

• Add replaceWithList and regexReplaceWithList filter functions (PR #3213)

• Add Replace Lists menu for Rename/Move detection keys (PR #3215)

• Make replace and replaceWithList case-insensitive (PR #3222)

• Add directives (@cs, @ci, @name) to filter expressions (PR #3253)

• Add "Filter by This Column" to folder view header context menu (PR #3268)

• Add display filter attributes and UI for filtering by comparison results
  (PR #3284)

• Add ability to hide empty folders in tree mode (PR #3293)

• Add Unpacker and Prediffer fields to file filter expressions (PR #3295)

• Enable dynamic increase/decrease of compare threads (PR #3304)

Plugins

• Add PrettifyPO and ValidatePO plugins for .po/.pot files (PR #3190)

• Feature request: In CompareMSExcelFiles do not append a sheet order number
  to individual tsv, txt or html files (#3212)

• Add CFR Java decompiler plugin for .class file comparison (PR #3242,#3243)

Translations

• Translation updates:
  • Brazilian (PR #3185,#3194,#3219,#3231,#3245,#3275,#3287,#3303)
  • Chinese Simplified (PR #3183,#3191,#3220,#3228,#3244)
  • Corsican (PR #3259,#3299)
  • French (PR #3239)
  • German (PR #3187,#3196,#3217,#3232,#3237,#3251,#3274,#3288,#3297)
  • Hungarian (PR #3186,#3238,#3252)
  • Italian (PR #3199,#3218,#3229,#3235,#3236,#3246,#3249,#3269,#3272,#3285,#3302)
  • Japanese (PR #3258)
  • Korean (PR #3247,#3279,#3301)
  • Lithuanian (PR #3184,#3192,#3230,#3276,#3290)
  • Polish (PR #3233,#3273)
  • Russian (PR #3226,#3281)
  • Turkish (PR #3204,#3221,#3227,#3250,#3271,#3286,#3298)
  • Ukrainian (PR #)

Documentation

• Added: Community standard files (like issue templates, pr template).
  (PR #3225)

• Add context IDs to PO files & strip comments for releases (PR #3296)

Known issues

• Pressing OK in the Options window while the INI file specified by /inifile is open for comparison in WinMerge may corrupt the file. (#2685)
• Suggestion to make the result of image comparison more reliable (#1391)
• Crashes when comparing large files (#325)
• Very slow to compare significantly different directories (#322)
• Vertical scrollbar breaks after pasting text (#296)

What's Changed

• Update Korean by @VenusGirl in #3157
• Update Polish.po by @miroslaw-zylewicz in #3158
• Update Russian.po by @Timon34 in #3159
• Update Russian.islu by @Timon34 in #3160
• update zh-TW translations by @love80312 in #3161
• Fix French.po by @gbabin in #3165
• Add automatic crash detection and reporting by @sdottaka in #3167
• update zh-cn translation by @yingang in #3169
• Italian language update by @bovirus in #3170
• Update Brazilian.po by @Marcellomco in #3171
• Update Hungarian.po by @efi99 in #3173
• Update German.po by @Havoc7891 in #3175
• Update Polish.po by @miroslaw-zylewicz in #3176
• Update of Lithuanian translation by @Tichij in #3177
• Update Turkish.po by @bilimiyorum in #3178
• Update Portuguese.po by @hugok79 in #3179
• Fixes and completion of French translation including complete Manual by @t3chnob0y in #3182
• Extend “Merge renamed items” option to support moved items by @sdottaka in #3181
• update zh-cn translations by @yingang in #3183
• Update of Lithuanian translation by @Tichij in #3184
• Update Brazilian.po by @Marcellomco in #3185
• Update Hungarian.po by @efi99 in #3186
• Update German.po by @Havoc7891 in #3187
• Add PrettifyPO and ValidatePO plugins for .po/.pot files by @sdottaka in #3190
• update zh-cn translations by @yingang in #3191
• Update of Lithuanian translation by @Tichij in #3192
• Update Brazilian.po by @Marcellomco in #3194
• Update German.po by @Havoc7891 in #3196
• Italian language update by @bovirus in #3199
• Refactor compare engines to use DiffContext by @sdottaka in #3197
• Refactor compare engines to write results into DIFFITEM and add FullQuickCompare by @sdottaka in #3201
• Update Turkish.po by @bilimiyorum in #3204
• Add e:/e!: filter prefixes for files and directories by @sdottaka in #3205
• Add replaceWithList and regexReplaceWithList filter functions by @sdottaka in #3213
• Enable IME text reconversion in editor view by @sdottaka in #3214
• Add Replace Lists menu for Rename/Move detection keys by @sdottaka in #3215
• Update German.po by @Havoc7891 in #3217
• Italian language update by @bovirus in #3218
• Update Brazilian.po by @Marcellomco in #3219
• update zh-cn translations by @yingang in #3220
• Update Turkish.po by @bilimiyorum in #3221
• Make replace and replaceWithList case-insensitive by @sdottaka in #3222
• Added: Community standard files (like issue templates, pr template). by @mlipok in #3225
• Update Russian.po by @Timon34 in #3226
• Update Turkish.po by @bilimiyorum in #3227
• update zh-cn translations by @yingang in #3228
• Italian language update by @bovirus in #3229
• Update of Lithuanian translation by @Tichij in #3230
• Update Brazilian.po by @Marcellomco in #3231
• Update German.po by @Havoc7891 in #3232
• Update Polish.po by @miroslaw-zylewicz in #3233
• Update Italian strings for the installer by @bovirus in #3236
• Update German.islu by @Havoc7891 in #3237
• Update Hungarian.po by @efi99 in #3238
• Update French translations by @t3chnob0y in #3239
• Add CFR Java decompiler plugin for .class file comparison by @Gaurav-pasi in #3242
• Add SHA256 checksum verification for CFR JAR download by @Gaurav-pasi in #3243
• update zh-cn translations by @yingang in #3244
• Update Brazilian.po by @Marcellomco in #3245
• Italian language update by @bovirus in #3246
• Update Korean by @VenusGirl in #3247
• Update of Lithuanian translation by @Tichij in #3249
• Update Turkish.po by @bilimiyorum in #3250
• Update German.po by @Havoc7891 in #3251
• Update Hungarian.po by @efi99 in #3252
• Add directives (@cs, @ci, @name) to filter expressions by @sdottaka in #3253
• Fix keyboard input issue after Alt+mouse operations by @sdottaka in #3254
• Fix crash caused by OnClose being called twice in image compare window by @sdottaka in #3255
• Refactor save confirmation logic using SaveClosingDlg::ShowAndSave by @sdottaka in #3256
• Fix incorrect GetAsyncKeyState usage for modifier key detection by @sdottaka in #3257
• Update Corsican translation for 2.16.55 by @Patriccollu in #3259
• Update winimergelib to 1.0.51 by @sdottaka in #3265
• Register self-compare in MRU and refactor command line parameter buil… by @sdottaka in #3266
• Update Japanese manual by @sdottaka in #3258
• Fix an issue where skipped items were not properly filtered during folder/file comparison. by @sdottaka in #3267
• Add "Filter by This Column" to folder view header context menu by @sdottaka in #3268
• Italian language update by @bovirus in #3269
• Update Turkish.po by @bilimiyorum in #3271
• Italian language update by @bovirus in #3272
• Update Polish.po by @miroslaw-zylewicz in #3273
• Update German.po by @Havoc7891 in #3274
• Update Brazilian.po by @Marcellomco in #3275
• Update of Lithuanian translation by @Tichij in #3276
• Update Korean by @VenusGirl in #3279
• Update Russian.po by @Timon34 in #3281
• Add display filter attributes and UI for filtering by comparison results by @sdottaka in #3284
• Italian language update by @bovirus in #3285
• Update Turkish.po by @bilimiyorum in #3286
• Update Brazilian.po by @Marcellomco in #3287
• Update German.po by @Havoc7891 in #3288
• Update of Lithuanian translation by @Tichij in #3290
• Update POCO C++ Libraries to 1.15.1 by @sdottaka in #3292
• Add ability to hide empty folders in tree mode by @sdottaka in #3293
• Add Unpacker and Prediffer fields to file filter expressions by @sdottaka in #3295
• Add context IDs to PO files & strip comments for releases by @sdottaka in #3296
• Update German.po by @Havoc7891 in #3297
• Update Turkish.po by @bilimiyorum in #3298
• Update Corsican translation for 2.16.55 (2nd) by @Patriccollu in #3299
• Fix potential hang in DiffWorker shutdown by @sdottaka in #3300
• Update Korean by @VenusGirl in #3301
• Italian language update by @bovirus in #3302
• Update Brazilian.po by @Marcellomco in #3303
• Enable dynamic increase/decrease of compare threads by @sdottaka in #3304

New Contributors

• @gbabin made their first contribution in #3165
• @t3chnob0y made their first contribution in #3182
• @Gaurav-pasi made their first contribution in #3242

Full Changelog: v2.16.54...v2.16.55