No creating. No sending. No receiving.
Try Kagisuru for free
Start instantly with just your email
#1 trending in technology category
2025/09
この製品は（公財）東京都中小企業振興公社 中小企業ニューマーケット開拓支援事業の支援対象製品です。
※但し、公社は製品の効能効果を保証するものではありません
Minimal effort, maximum security.
Lock files with passkeys instead of passwords. Only the recipient you specify by email can unlock them.
No need to create or remember complex passwords. Simply enter the recipient's email address to create a file that only they can open.
Much easier and safer than managing passwords. Unlocking requires a one-time passcode (6-digit number) for authentication.
For recipients already using Kagisuru, additional passkey authentication ensures secure identity verification. Even if you send to the wrong address, only the specified recipient can unlock.
Download encrypted files and send them any way you prefer - even if leaked, they remain secure.
Encrypted files are highly secured, so you can safely send them via email, Slack, Teams, or any method. Files are encrypted and decrypted on your PC without using Kagisuru servers, so the original unencrypted file is never stored anywhere.
Create files that only specific recipients can open by simply entering their email address. You can specify anyone, even if they don't use Kagisuru, and no prior account registration is required.
Get started instantly with a free plan.
Business plans available.
Contact us →