Is there a software tool that will help me knit together separate image files into a spritesheet?

Soon I’ll have 127 separate .PNG files - frames of a knob that I am preparing.
I need to knit these all together in a vertical list in a one file spritesheet that imports into JUCE for my new lookAndFeel.

Is there a tool I can use to help me in this task ?

I use this since forever: CSS Sprite Generator - CSS Portal

Very handy

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You can use this one: Strip Generator | Blog | Wavesfactory

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Or to automate the process, one can use ImageMagick convert +append from a script (or command line):
https://imagemagick.org/script/convert.php

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