Magento upgrade 1.8.1 to 2 via LitExtension tool

As I understand, many storeowners have trends to migrate old version of Magento to Magento 2. E-merchants can try with Magento migration tool that is an automated shopping cart migration solution of LitExtesion to migrate database from magento 1.x to magento 2.

UPGRADE MAGENTO 1.8 TO 2
- NO DOWNTIME: Data is migrated with no downtime for your current Magento® store
- WORK ONLINE OR OFFLINE: Migration progress can run on both Online or Offline development environment.
- PRESERVE IDs: Preserve Order IDs, Customer IDs on the Magento®
- SELECT DATA MIGRATION
- RE-MIGRATION: Unlimited re-migrations with NO extra cost
- MIGRATE RECENT DATA: You have just finished a full migration, after that old Magento® is still live and continue getting new data, and you want to get your new Magento® updated with the new data, this feature to avoid starting over again.
- CLEAR DATA BEFORE MIGRATION: Allow deleting current data from the Magento® before migration
- DATA SECURITY: Direct data transfer from Magento 1.8 to 2. NO third party involved.

More Magento migration:
- Upgrade Magento 1.8 to 1.9
- Upgrade Magento 1.7 to 2.0
- Upgrade Magento 1.9 to 2.0

https://www.youtube.com/watch?v=29n3mzhpNxI

Magento 2 continues to prove the power of the leading e-commerce platform in the e-commerce with the radicaly increase of active store's number. Users of Magento 1.8 ànd 1.9, the last versions of Magento 1.x have trend to upgrade magento 2 to update new features, new extensions for online business. Upgrade magento 1.8 to 2.0 is smart e-commerce solution to upgrade database (products, customers, orders, categories, taxes, product reviews, product URLs, currency) from old version to Magento 2. The strongest point of the solution is automated migration between magento 1.8 and magento 2, so it limits errors of loosing data.

Regularly upgrade Magento webshop brings you not only the newest features, but also security fixes, which is highly important for your Magento store’s safety. Not updating your Magento can result in not only a bad performance, but it makes your shop an easy target for hackers.

Before you start upgrade magento 1.8 to 2:
- Make sure you have a recent and clean backup. Both a file and database backup. In case anything goes wrong while updating, you can restore your data easily. More information about making backups can be found in the article Historical backups.
- Check the versions release notes to see what changes have been made.
- Choose a quiet moment to update your Magento. Preferably when there’s hardly any traffic on your site.
- Test an update on a staging environment to make sure all aspects of your shop are compatible with the newest version.

You can follow Magento migration guidee to upgrade magento 1.8 to 2.0 automatically

When Magento 2.0 was released, it could be either installed using composer or using a ZIP-based install. When Magento 2.1 was released, the overall advice was to upgrade as soon as possible. However, the composer method failed because of missing dependencies. This short guide tells you how to step from Magento 2.0.0 to 2.0.1 or later using composer.

On the other hand, automated magento upgrade extension is developed for magento upgrade to 2.0, magento upgrade to 2.1 quickly with keeping all existing data. Here is magento upgrade guide to upgrade magento 1 to 2, supported the latest version of magento.