Some countries are either implementing or planning to change laws that would enforce backdoor access to encryption provided by cloud services. Below are some decentralized encryption solutions that I recommend for both the present and the near future.
Runs on a server.
Self-hosted, end-to-end encrypted cloud storage. Files, names, and search queries stay encrypted on your device. Open source server, runs in ~20 MB RAM.
An easy way to self-host your own file storage cloud encrypted.
Cryptomator provides transparent, client-side encryption for your cloud. Protect your documents from unauthorized access. Cryptomator is free and open source software, so you can rest assured there are no backdoors.
Transform any cloud drive into your own end-to-end encrypted storage. Even if countries like the UK and potentially Sweden introduce laws granting authorities backdoor access to encryption, you can still maintain full control with your own end-to-end encryption solutions.
hat.sh is a javascript app that provides secure file encryption using the AES-256-GCM algorithm from WebCryptoAPI provided by your browser. it was coded following the WebCrypto Documentations .
Can encrypt files from the website as it can be self hosted on your own server,
CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.
Selfhosted or cryptPad as a service that provides on cloud office solutions with encryption.
Can be used on the device itself.
Truvark is first and foremost a security-focused application. The goal is to provide strong, well-understood security guarantees rather than relying on "security through obscurity" features. While some vault applications include hidden modes, disguises, fake vaults, or...
Simple, easy to use one of the few offline encryption solutions for android.
AstraCrypt - is a free, powerful and open-source encryption app that has everything you need to keep your data safe and secure.
Astracrypt Is similar to Picocrypt with using AES526 encryption.
Secure and encrypt entire partitions or devices, including system drives, with automated, real-time protection and enhanced security measures.
One mission, Encryption to your needs with best performance. Encrypt files or storage volume with Veracytp. opensource and strongest encryption.
Efficient file archiver offering superior compression and encryption. Supports multiple formats such as TAR, ZIP, with a unique self-extracting feature.
7zip is easy to use. can archive folders and files with strong encryption. 7zip has its own flaws in their complex coding that leaded to some exploitation, but there is still a lot of good. And since this project is opensource, bugs getting fixed faster and the transparency keeps pushing the project to its best performance.
GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.
Key exchange encrypting with an additional passphrase.
Amaze File Manager is an intuitive, open-source file manager for Android that's both free and ad-free (no upgrade offers, no popups, no ads at all). It's based on Material Design guidelines so it sits very nicely alongside the stock Android experience from Google and...
Ameze Runs also good on Andoird to manage compressed files with encryption. The disadvantage would be that ZipXtract would run faster and support more compression formats.
Peer-to-Peer file sharing with auto-expiring links. Supports Tor, QR codes, multi-language. 24-hour server retention. Features also include clipboard sharing and custom link expiration.
Share files with others with Wormhole. End to end encrypted.
Send up to 50GB securely and for free. No registration required, download links valid for 30 days. Share via email or link with optional password protection. Data stored in Switzerland.
Provided by Infomaniak
Secure file transfer with end-to-end encryption. Supports async transfers and large files. Files expire after 7 days. Data stored securely in Switzerland.
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Update: I sadly have to remove Picocrypt from the list since the project is now Discontinued. It is a big loss.
Take a look at
Hoodik , 
OpenKeychain and 
Wormhole
Thank you for the input. yes as u say it now I am satisfied with wormhole too. let me add those.