Secure file sharing for sensitive client transfers

Data as of Oct 15, 2026A topic in Secure Cloud Storage and File Sharing.Reviewed by Dimitry Apollonsky

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Secure file sharing for sensitive client transfers in Secure Cloud Storage and File Sharing | Parse

For large, sensitive files going to external clients, my default recommendation is Tresorit if confidentiality is the top priority, and Box if you need stronger enterprise governance and collaboration.

My shortlist

Service	Best for	Security	External clients
Tresorit	Maximum confidentiality	Zero-knowledge end-to-end encryption	Excellent
Box	Enterprise/client collaboration	Strong encryption, granular controls, audit/governance	Excellent
Kiteworks	Highly regulated organizations	Customer-controlled keys, extensive governance/auditing	Excellent
Egnyte	Secure business collaboration	Strong encryption, governance, content controls	Very good
Files.com	Large transfers + automation	Enterprise-grade secure transfer/MFT	Very good

Why Tresorit is my #1 for truly sensitive material: it uses zero-knowledge E2EE, meaning encryption keys aren't available to Tresorit in readable form. It also supports external collaboration, SSO, device controls, and compliance features.

Why Box may be the better business choice: clients can receive files through links without needing a Box account, while you get permissions, expiration, download restrictions, encryption, and audit trails. www.box.com Box also has more extensive enterprise governance and customer-managed-key options.

Kiteworks is the choice I'd investigate for legal, healthcare, government, defense, or other heavily regulated environments where you need centralized policies and an extensive audit trail across file sharing, secure email, managed file transfer, and web forms.

What I'd choose

Law firm / financial advisor / healthcare / confidential client documents: Tresorit
General business sending huge files to clients: Box
Government/defense/high compliance: Kiteworks
Lots of automated or recurring transfers: Files.com
Already heavily invested in Microsoft 365: OneDrive/SharePoint can be very good, provided you configure external-sharing and DLP controls properly.

For sensitive client transfers, I would not simply send an unrestricted “anyone with the link” URL. Use an authenticated recipient where possible, set an expiration date, disable downloading when practical, require MFA/password protection, and retain access/audit logs.

If you tell me roughly how large the files are (e.g. 10 GB, 100 GB, 1 TB), how many clients you send to, and whether HIPAA/FINRA/GDPR/CMMC compliance matters, I can narrow this to the best 2–3 options and compare their current pricing and limits.

Sources cited in this answer6

When sending heavy design files (like layered PSDs, 4K video, or vector packages) to external clients, you need a mix of unlimited/high file size caps, strong security controls (password protection, link expiration), and a professional presentation that doesn't require the client to create an account.

Top secure file sharing services well-suited for design workflows include:

Smash — Excellent for one-off large transfers. It has no file size limits even on the free tier, and paid tiers add custom branding so you can feature your agency/studio logo on the download page. Security-wise, it offers end-to-end encryption, password protection, and links that automatically expire after a set time. You can test it out on the Smash Website.
Dropbox Transfer — Great if you already use Dropbox for storage. It allows you to deliver up to 250 GB per transfer via a secure link without giving clients access to your actual folder structure. You can add passwords, set expiration dates, and track download confirmations. Learn more on the Dropbox Transfer Feature Page.[](https://www.dropbox.com/features/share/file-transfer)[[2](https://fabric.so/comparison/best-tool-for-organizing-client-files)](https://fabric.so/comparison/best-tool-for-organizing-client-files)
Tresorit — Best for maximum, zero-knowledge security. If you are sending highly confidential or unreleased brand assets, Tresorit uses client-side end-to-end encryption (meaning not even the company's servers can read your data) and allows secure, tracked link sharing with precise access controls. Check it out at Tresorit.
Filemail — Built specifically for massive files with no size caps . It features robust encryption in transit, two-factor authentication, and built-in virus scanning for outgoing assets, plus options to receive client files back securely. Explore features on the Filemail Website.
WeTransfer (Pro) — The familiar go-to for creatives. While the free tier is basic (up to 2 GB), upgrading to Pro unlocks password protection, custom link expiration, branded backgrounds, and up to 1 TB of storage. Visit WeTransfer.

If you want to narrow this down, let me know:

Do you need permanent cloud storage/organization , or just one-off delivery links?
Do you prefer a free tier or are you willing to pay for custom branding and advanced security?

Sources cited in this answer2

Feature	MASV	Dropbox Transfer	Box
Very large files	Excellent	Up to 250 GB with add-on	Supports large transfers; check plan limits
Client account needed to download	No	No	No
Password-protected sharing	Yes	Yes	Yes, on supported paid plans
Expiring links	Yes	Yes	Yes
Ongoing project folders	Integrates with storage tools	Excellent	Excellent
Download tracking	Detailed transfer tracking	Notifications	Depends on workflow and plan

Secure file sharing for sensitive client transfers

Which brands AI mentions

Secure file sharing for sensitive client transfers

Which brands AI mentions

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