Cloud storage with an independent security audit (2026)

A security claim is only a claim until an independent auditor checks it. These cloud storage services from our ranking have a published independent security audit; each one is linked as a source.

Best Cloud Storage Services 2026: Independent Ranking

  1. 2

    IDrive

    68/100
    End-to-end encryption of files
    Yes
    Free storage, GB
    10
    Price per TB per month (cheapest plan of 1 TB+)
    $2.00
    • Low price per terabyte
    • Files can be encrypted on your device: the company cannot read them
    • Security verified by an independent audit
    • Apps for almost every platform
  2. 3

    Proton Drive

    65/100
    End-to-end encryption of files
    Yes
    Free storage, GB
    5
    Price per TB per month (cheapest plan of 1 TB+)
    Not verified
    • Files can be encrypted on your device: the company cannot read them
    • Security verified by an independent audit
    • Apps for almost every platform
    • Publishes a report on government data requests
  3. 4

    Tresorit

    63/100
    End-to-end encryption of files
    Yes
    Free storage, GB
    3
    Price per TB per month (cheapest plan of 1 TB+)
    $11.12
    • Files can be encrypted on your device: the company cannot read them
    • Security verified by an independent audit
    • Apps for almost every platform
    • Publishes a report on government data requests
  4. 6

    Sync.com

    57/100
    End-to-end encryption of files
    Yes
    Free storage, GB
    5
    Price per TB per month (cheapest plan of 1 TB+)
    $12.00
    • Files can be encrypted on your device: the company cannot read them
    • Security verified by an independent audit
    • Apps for almost every platform
    • Shared links can be protected with a password
  5. 7

    Dropbox

    56/100
    End-to-end encryption of files
    No
    Free storage, GB
    2
    Price per TB per month (cheapest plan of 1 TB+)
    $5.56
    • Security verified by an independent audit
    • Apps for almost every platform
    • Publishes a report on government data requests
    • Account can be protected with a hardware security key
  6. 12

    Internxt

    43/100
    End-to-end encryption of files
    Yes
    Free storage, GB
    1
    Price per TB per month (cheapest plan of 1 TB+)
    $11.12
    • Files can be encrypted on your device: the company cannot read them
    • Security verified by an independent audit
    • Apps for almost every platform
    • Shared links can be protected with a password