For a lawyer handling privileged case files, I’d avoid ordinary email attachments and consumer-grade file-sharing links. The key is not just encryption, but matter-level permissions, recipient authentication, expiration/revocation, and an audit trail showing who accessed or downloaded what.
Firms wanting files to remain on their own infrastructure
Browser access to existing file shares, granular permissions, DLP, device controls and audit logging
Excellent
What I'd choose
For most solo/small-to-midsize firms: ShareFile. It is explicitly positioned for legal practices and combines secure client portals with file exchange and document workflows. ShareFile says files are encrypted with AES-256 at rest, TLS in transit, and that administrators can track logins, uploads, downloads, sharing and deletions.
If your firm already runs iManage: use iManage Share rather than creating a separate file-sharing silo. Its external sharing supports expiration dates, permissions, password protection and a full audit trail.
If you need unusually strong control after delivery: look closely at Virtru. Its legal offering uses client-side encryption and can enforce policies such as expiration, revocation and watermarking; its audit facilities record document access.
For a large firm/DMS replacement: NetDocuments is particularly compelling because its security model includes role-based access controls, ethical walls and full audit trails alongside its legal document-management functionality.
The security configuration matters as much as the vendor
Whichever you select, I'd configure it around:
MFA for attorneys, staff, clients where feasible, and co-counsel
Matter-specific workspaces, rather than broad firm-wide folders
Least-privilege access — client A shouldn't be able to discover client B's materials
Expiring links/invitations and the ability to revoke access immediately
Download/view auditing, including user, timestamp and ideally IP/device information
Separate client and co-counsel permissions
Malware/DLP scanning for client uploads
Retention and deletion policies appropriate to your firm's obligations
Administrative audit logs that cannot simply be altered by ordinary users
A written procedure for offboarding clients, co-counsel and former employees
A useful distinction: "encrypted" doesn't automatically mean "secure enough for legal work." A recent legal-sector security checklist emphasizes authentication, matter matching, least privilege, encryption/key management, download controls, malware scanning, audit logs, retention/legal holds, incident response and vendor risk as separate controls.
If you tell me (1) roughly how large the files are, (2) firm size, (3) whether you're already on Microsoft 365/iManage/NetDocuments, and (4) whether clients need to upload files back to you, I can narrow this to the best 2–3 options and compare pricing, security certifications, file-size limits, and client experience.
Sharing large case files securely while maintaining compliance with ABA Model Rules (like Rules 1.1 and 1.6 on confidentiality and competence) means moving away from standard email attachments and consumer-grade cloud links.
The best approaches depend on whether you want an all-in-one practice management ecosystem or specialized secure transfer tools.
Dedicated Legal Document Management & Portals
NetDocuments : Widely regarded in the legal industry for high-level security, granular access controls, and robust external sharing features that let you securely collaborate with co-counsel and clients without losing track of document versions.
Clio Manage / Clio for Clients: Offers an integrated practice management system with an encrypted client portal, allowing clients and co-counsel to upload, view, and sign documents within a matter-centric environment.
Secure File Transfer & Collaboration Platforms
Titanfile : Built specifically to be as easy to use as email, but encrypted and compliant. It handles massive file sizes smoothly and provides clear tracking and audit logs.
Box : Enterprise-grade secure cloud storage with advanced tier permissions, watermarking, detailed audit trails, and compliance certifications well-suited for sensitive legal workloads.
Key Features to Insist On
Audit Trails: Knowing precisely when a recipient opened, downloaded, or viewed a file is critical if privilege or receipt is ever contested.
Granular Permissions: Ability to set expiration dates on links, revoke access remotely, and restrict downloading or printing if necessary.
Encryption at Rest and in Transit: Essential for satisfying your ethical duty of confidentiality.
To help narrow down the ideal option, tell me:
Do you currently use a legal practice management software (like Clio, PracticePanther, or Filevine)?
Do you need co-counsel to be able to edit/collaborate, or just view and download?
