Pattern Keeper

Pattern Keeper is a powerful Chrome extension for cross stitch enthusiasts that allows you to view and annotate PDF cross stitch charts seamlessly. Designed to display your chart as one continuous pattern, it enables easy stitching across page breaks and eliminates the need to flip between legend and chart by highlighting symbols along with their thread numbers.

You can mark finished stitches by swiping in any direction and even annotate entire 10x10 squares, with finished stitches shown in color for quick navigation and comparison. Additional features include tracking parked threads by specific square corners and monitoring your overall stitching progress with daily and total stitch tallies. The extension offers a month-long free trial followed by a one-time fee, supporting charts from popular vendors though still in beta with some limitations on backstitches and scanned images.