Honest answer up front: Pleco can export its flashcards, but most handwriting-focused apps do not import them natively, so today there is usually no one-tap transfer from your Pleco list into a writing tool. The realistic path is exporting your character list and rebuilding the set where you practise.
That sounds like a hassle, and it can be. But the bigger point is that importing a list is not the part that teaches you to write.
What actually transfers from Pleco
Pleco supports exporting flashcards, in text and its own formats, so getting your character list out is usually possible. The friction is on the other side: a handwriting app has to choose to support that import, and most are built around their own sets (HSK levels, built-in decks) rather than arbitrary external files.
So before assuming you can move a deck in one step, check the target app’s import options directly. Many cannot, and the workaround is manual: copy your characters across and rebuild the set.
Why a flat list is not the goal anyway
Here is the part worth slowing down on. A Pleco flashcard list is optimised for lookup and recognition. Bringing it into a writing app does not, by itself, make you able to write those characters. Writing is recall, the character produced from memory, which is a different skill from recognising it on a card. We cover the distinction in the case for a dedicated Hanzi writing app, and how spacing helps in the forgetting curve for Hanzi.
In other words, even a perfect importer would only move the easy part across. The work is in the practice, not the transfer.
Where Hanzi Write Practice stands, honestly
Hanzi Write Practice does not currently offer native Pleco import. It is a focused from-memory writing app: you build a set, often by HSK level or from your own characters, draw each one from memory on a practice grid, and let spaced repetition return the ones you forget.
Native import of external decks is exactly the kind of feature early-access feedback helps us weigh, and it is honest to say it is not in today. If your Pleco list is large, the pragmatic move now is to practise from HSK sets that overlap heavily with common Pleco lists, and add your specific characters as custom entries.
Keep Pleco for lookups. Practise writing somewhere built for recall, however the characters get there.
Join early access and tell us which characters you keep forgetting.