version 6.4.64, 17 April 2026

• Many small improvements and bug repairs in speech recognition, including automatic alignment and diarization.

version 6.4.63, April 4, 2026

• Speaker diarization in Transcribe interval (if Whisper models installed).
• Mac: Command-mousewheel zooming (as on Windows).

version 6.4.62, March 13, 2026

• Sound: To TextGrid (speech activity, Silero)...: “voice activity detection” by AI.
• TextGrid window: fixed a bug from 2013 or earlier that could cause Praat to crash during interval alignment.
• Fixed a bug that caused Praat to crash if a notebook was run twice.
• Linux: support horizontal scrolling in three ways (two-finger swiping on the touchpad; left and right tilting of the mouse’s scroll wheel; turning the mouse’s scroll wheel while keeping the Shift key pressed).
• Linux: support zooming by turning the mouse’s scroll wheel while keeping the Ctrl key pressed).

version 6.4.61, February 28, 2026

• Transcribe interval (via automatic speech recognition): better word alignment via Whisper’s built-in DTW.
• Transcribe interval (via automatic speech recognition): option for silence removal (via an additionally installed AI model).
• Windows: Ctrl+Alt+Letter menu shortcuts have become Ctrl+Shift+Letter, because that’s the way it’s nowadays done in e.g. browsers and NotePad, and because Ctrl+Alt+Letter combinations can stand for actual Alt-GR characters on some keyboards. On the Mac we still use Option+Command+Letter. Note that on most Windows keyboards the Ctrl and Alt keys are adjacent, as as the Option and Command keys on most Mac keyboards.
• Manual: menu shortcuts for Previous page and Next page.

version 6.4.60, February 10, 2026

• Scripting: fixed an interaction between pause windows and exitScript.
• Scripting: turned cases of multiple identical procedure names into once-warnings instead of errors.

version 6.4.59, February 5, 2026

• Made nested scripts with pause windows and/or Demo window work again.
• Fixed a bug by which SpeechRecognizer creation could make Praat crash on some platforms.

version 6.4.58, January 25, 2026

• MacOS Tahoe: support making menu choices or turning windows to full screen if a script is paused (by the Demo window or the Pause window), as on earlier MacOS versions and on Windows and Linux.
• Windows: support horizontal scrolling in three ways (two-finger swiping on the touchpad; left and right tilting of the mouse’s scroll wheel; turning the mouse’s scroll wheel while keeping the Shift key pressed).
• Windows: better dotted or dashed thick lines.
• Sound: To PowerCepstrogram... now averages the power over channels instead of taking only channel 1.
• Opening TIFF files with Read from file..., as well as Insert picture from file...: rid a bug that would show monochrome TIFF files in four vertical stripes.
• Mac and Linux: made Insert picture from file... work for PDF files again (bug since 6.4.28).
• Backslash trigraph for apico-postalveolars: ṣ (s.v), following Ladefoged & Maddieson (1996), who wanted to distinguish them from the more extreme retroflexes, i.e. apico-palatals such as ʂ (\s.).
• Linux: prevented a crash when a “barren” edition tried to run runAllTests_batch.praat.
• Scripting: runSubprocess and runSystem now support asynchronous, with which you can spawn a subprocess without waiting for it to finish.
• Scripting: randomImax.
• Scripting: in pause forms, allow vector expressions as defaults in vector fields.
• Scripting: syntax check against duplicate procedure names.
• Scripting: no longer any limits on the number of labels and procedures.

version 6.4.56, January 23, 2026

• MacOS Tahoe: support making menu choices or turning windows to full screen if a script is paused (by the Demo window or the Pause window), as on earlier MacOS versions and on Windows and Linux.
• Windows: support horizontal scrolling in three ways (two-finger swiping on the touchpad; left and right tilting of the mouse’s scroll wheel; turning the mouse’s scroll wheel while keeping the Shift key pressed).
• Windows: better dotted or dashed thick lines.
• Sound: To PowerCepstrogram... now averages the power over channels instead of taking only channel 1.
• Opening TIFF files with Read from file..., as well as Insert picture from file...: rid a bug that would show monochrome TIFF files in four vertical stripes.
• Mac and Linux: made Insert picture from file... work for PDF files again (bug since 6.4.28).
• Backslash trigraph for apico-postalveolars: ṣ (s.v), following Ladefoged & Maddieson (1996), who wanted to distinguish them from the more extreme retroflexes, i.e. apico-palatals such as ʂ (\s.).
• Linux: prevented a crash when a “barren” edition tried to run runAllTests_batch.praat.
• Scripting: runSubprocess and runSystem now support asynchronous, with which you can spawn a subprocess without waiting for it to finish.
• Scripting: randomImax.
• Scripting: in pause forms, allow vector expressions as defaults in vector fields.
• Scripting: syntax check against duplicate procedure names.
• Scripting: no longer any limits on the number of labels and procedures.

version 6.4.51, December 30, 2025

• Windows: switch back to the faster version (version 6.4.50 was deliberately slower, so as to support Windows 7 and 8.1 for the last time).

version 6.4.50, December 29, 2025

• A bit of speech recognition via Whisper.cpp (adapted to Praat by Anastasia Shchupak), such as Transcribe interval in the TextGrid window. This works after you install one or more Whisper-cpp models, such as ggml-base.bin (from https://huggingface.co/ggerganov/whisper.cpp) in the models subfolder of the preferences folder.