What I do with all the receipts that I accumulate doing Instacart, Cornershop, Runner and several other gig apps.
Evernote is free (no, this is not a sponsorship). It’s available for Windows, Mac, iPhone OS, Android or through the browser: https://www.evernote.com/referral/Registration.action?sig=e62c8a006e61b0a4e11d49baeba3832ce4bc7429e961dc59d43392e481b2fc2e&uid=48966836
You can choose to upgrade if you want, but I’ve never paid for Evernote. The free version gives you access to your account on up to two devices.
I forgot to mention that the information is stored on the Evernote server, so it takes very little space on your device(s). They have a very robust security system, because they are used by some of the biggest companies in the world.