Install brushes to Illustrator
Install custom brushes to Illustrator
With photoshop, you can install custom brushes. With Illustrator, you have to make any custom brush yourself which can be tedious and very difficult.
Jamie
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Illustrator for desktop allows to save and import brushes with an ease.
To save brushes, just save a document with your brushes as an .ai file. You don’t have to have them on canvas for this, just in Brushes panel.
To load brushes, click the Brush Libraries Menu button in the bottom left corner of the Brushes panel (looks like a bookshelf). Choose Other Library, locate the brush library .ai file.
If you want to create, save and import brushes in Illustrator for iPad — you have to vote for this feature here: https://illustrator.uservoice.com/forums/931888-illustrator-ipad-feature-requests/suggestions/41682511-import-or-create-brushes