The best alternatives to Syncrypto are hat.sh, NordLocker, and Oka Unarchiver. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
this is a javascript app that provides secure file encryption using the AES-256-GCM algorithm from WebCryptoAPI included in your browser. It's fast, secure and client-side, the app never uploads the files to the server. the app can encrypt any type of files.
From vacation photos to your digital creations and documents of any kind – nearly all files contain bits of sensitive information. And that makes them worth protecting. — Creators of NordVPN
Kryptor is free and open source file encryption software for Windows, Linux, and macOS. It is a portable, cross-platform command line tool that makes use of modern and secure cryptographic algorithms. It aims to be a simple, user friendly alternative to GPG.
From hybrid work to hybrid cloud, gain easy and unified access to files wherever they are stored—in a data center, in the cloud, or on edge networks—across any distance.