Secure document sharing

How to Send Sensitive Documents Securely in 2026 (Beyond Email Attachments)

Email attachments were never built for confidential work. Here is how to send sensitive documents securely, with encryption, access control and an audit trail, and the simplest way to do it.

Last updated June 20269 min readBy the Alkmist team

The short version

Email was never built to move confidential documents safely. Standard attachments are not protected once they land, you lose all control after you hit send, and a 25 MB cap pushes people onto risky consumer tools. The secure way is to share a branded, encrypted link with expiry, password and an audit trail, so the file stays protected and you can prove who accessed it. Alkmist Share Space does exactly this: AES-256 encrypted links on your own domain, up to 5 GB, EU-hosted and ISO 27001 certified.

Why email attachments are risky

Four reasons sensitive documents should not travel as email attachments.

Attachments are not protected after they land

Standard email encrypts the connection, not the file at rest in every inbox it touches. Once a document is sent, you cannot expire it, revoke it, or control who it is forwarded to.

The inbox is the number one way in

IBM's 2025 Cost of a Data Breach report puts phishing as the single most common entry point for breaches, and the global average breach now costs 4.44 million dollars. In the Benelux it is 6.24 million.

Size limits force risky workarounds

Gmail caps attachments at 25 MB and Outlook at around 20 MB, so people fall back to consumer tools or personal drives, scattering sensitive files outside any control.

No record of who saw what

Email gives you no audit trail. For regulated work you cannot prove who accessed a document, when, or whether it was downloaded.

How to send sensitive documents securely

A simple checklist that holds up to regulated, client-facing work.

Encrypt the file, not just the connection

Use a tool that encrypts documents at rest and in transit, like AES-256, so the file is protected the moment it leaves your hands.

Keep control after you send

Set link expiry, password protection and read receipts, so access ends when it should and you can see what happened.

Keep an audit trail

Log who created, viewed, downloaded or revoked each file, and export it for auditors in one click.

Make it branded so clients trust it

A link on your own domain, in your own branding, reassures clients far more than a random consumer URL, and reduces risky hesitation.

The simplest secure way: Alkmist Share Space

Everything on the checklist, in one branded, compliant flow.

Branded, encrypted link

Send, don't attach

With Alkmist Share Space you send a file as a branded, AES-256 encrypted link instead of an attachment. Recipients get a clean download page on your domain, not a generic consumer tool.

Your security rules

Expiry, password, receipts

Set link expiration (7 days, 30 days or indefinite), add optional password protection for extra-sensitive files, and get read receipts when a document is opened.

Any size

Up to 5 GB per file

Send entire workpaper archives in one go, with no 25 MB email cap and no falling back to personal drives.

Proof built in

Full audit trail

Every action is logged with timestamps and IPs, and you can export a compliance-ready report for auditors or regulators. EU-hosted, ISO 27001 certified, GDPR-aligned, never used to train AI.

Alkmist secure sharing in numbers

5 GB
per file, vs Gmail's 25 MB cap
AES-256
encryption at rest and in transit
0
accounts needed for clients to upload
ISO
27001 certified, GDPR, EU-hosted

Questions, answered

How do I send sensitive documents securely instead of by email?
Share a branded, encrypted link rather than an email attachment. With Alkmist Share Space you upload the file, it is encrypted with AES-256, and the recipient gets a download page on your own domain with optional password protection, link expiry and read receipts, plus a full audit trail.
Are email attachments secure?
Not for confidential work. Standard email encrypts the connection but not the file at rest in every inbox, and once sent you cannot expire, revoke or track it. IBM's 2025 report shows the inbox is the most common breach entry point, which is why regulated teams move sensitive files into a controlled environment.
How do I send a file larger than 25 MB securely?
Gmail caps attachments at 25 MB and Outlook at around 20 MB. Instead of falling back to a consumer tool or personal drive, use a secure sharing link. Alkmist Share Space sends up to 5 GB per file, encrypted and branded, with no caps.
Is Alkmist a secure alternative to WeTransfer for sensitive files?
Yes. Alkmist offers the same drag-and-drop simplicity as WeTransfer, but the link is on your own brand and domain, files are AES-256 encrypted, data stays in the EU, and you get an audit trail. It is built for regulated, professional work rather than casual transfers.
Can I prove who accessed a document?
Yes. Alkmist logs every action, created, viewed, downloaded, revoked, with timestamps and IPs, and lets you export a compliance-ready report for auditors or regulators in one click.

Send confidential files the safe way

Alkmist Share Space turns attachments into branded, encrypted links with expiry, passwords and an audit trail, up to 5 GB, EU-hosted. Start secure sharing or book a demo.