If you received a file, you can unlock it here
Just specify the receiver by email to encrypt. No passwords or links needed.
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Start instantly with just your email
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#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)
Kagisuru addresses common file exchange problems all in one place.
I sent it to the wrong person...!
You can revoke access even after sending, preventing the receiver from opening the file.
POINT:Even after the attachment reaches the receiver, you can revoke it before it is opened!
The file is too large to send...
Send large files via email. Kagisuru's cloud only stores encrypted files, so your data stays safe.
POINT:You can send files larger than 1 GB!
I want to know if the receiver opened the file
Track when and who unlocked each file. Useful for confirming delivery and managing important documents.
POINT:You can also track who in your department has opened a file!
I don't want to receive files as password-protected ZIPs
Create a dedicated page for receiving files securely from external parties. Files are sent in an encrypted state.
POINT:Just share the receiving page URL to eliminate password-protected ZIPs with your partners!
Just specify the receiver's email address to share.
You create a file only that person can open. No complex password generation or ongoing permission management.
Safe across email, chat, USB drives, or isolated networks.
Encrypted files can be sent as-is, so you do not need to change your team workflow or partner environments.
Files decrypt only when the receiver is verified as the intended person.
Receivers go through email one-time code or passkey authentication. Misdelivery does not lead directly to a breach.
Minimal effort, maximum security.
Just enter the receiver's email address to lock your files. No password creation, sharing, or management required.
No need to create or remember complex passwords. Simply enter the receiver'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 receivers already using Kagisuru, additional passkey authentication ensures secure identity verification.
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.
Solve the everyday risks hidden in file sharing, scenario by scenario.
Protect customer data, contracts, and other sensitive files against misdelivery and interception in transit.
Eliminate separate password delivery and decompression. Exchange files safely without burdening your partners.
Remove password creation, management, and handoff. Structurally prevent incidents caused by human error.
An easy-to-use workflow that removes the need to rely on unsanctioned external storage or free services.
Unlimited file locking and unlocking, and zero cost for receivers. Group features let departments and teams operate safely at scale.
No charge for receivers
Unlimited locking and unlocking
Create unlimited groups
What groups enable
Try Kagisuru for free
Start instantly with just your email
