I'm a lawyer and I need a secure way to share large case files with clients and co-counsel.

For a law practice, I’d use a legal-focused client/collaboration portal rather than ordinary email attachments or consumer cloud storage. The important features are granular permissions, expiration/revocation, audit logs, encryption, reliable backups, and contractual confidentiality/security obligations.

Two strong options

• iManage Share / iManage Work — particularly compelling if your firm already uses iManage. It supports large-file exchanges and shared collaboration folders, with administrator-controlled access and auditability. iManage also has newer Collaboration Links that let outside users access the original document on a time-limited basis rather than creating another copy.Docs - iManage+3
• ShareFile — designed around a secure client portal, with client uploads, document exchange, requests, and document workflows in one workspace. This can be useful when clients need to send you large files as well as receive them.ShareFile+1

What I'd require before putting case files into any service

1. MFA for every attorney/staff account, with no shared credentials.
2. Individual client/co-counsel permissions rather than a generic shared link.
3. Expiration and immediate revocation of access.
4. Download/access audit logs, especially for sensitive productions.
5. Encryption in transit and at rest, with clear documentation of the provider's key-management practices.
6. Administrative controls preventing users from accidentally sharing a matter with the wrong person.
7. Backups and disaster recovery that you have actually reviewed.
8. A breach-notification commitment and meaningful security obligations in the vendor agreement.
9. Data-retention/deletion provisions, including what happens when the representation ends.
10. For particularly sensitive matters, consider separating the most sensitive material into its own access-controlled workspace.

The ABA's guidance is useful here: lawyers should select reputable providers, take reasonable steps to preserve confidentiality, ensure files are backed up and accessible after data loss, and have a breach-response plan. American Bar Association American Bar Association The ABA also emphasizes evaluating the vendor's security, reliability, confidentiality protections, and contractual arrangements rather than assuming that a particular technology is automatically appropriate merely because it is widely used.American Bar Association+1

Practical setup: For a litigation practice, I'd create one workspace per matter, give the client and each co-counsel firm named accounts, use MFA, disable public links, set matter-specific expiration dates, and retain the platform's access logs with the matter records. That gives you a much cleaner chain of custody than emailing ZIP files or passing around generic Dropbox/Google Drive links.

If you tell me roughly how large the files are (e.g. 10 GB vs. 500 GB), whether you already use Microsoft 365/iManage/ShareFile, and whether clients need to upload files back to you, I can narrow this to the most appropriate setup and compare the security/features side-by-side.

When sharing large case files, discovery, or media evidence with clients and co-counsel, you need a solution that balances strict confidentiality/privilege protection, ease of use for non-technical clients , and no frustrating file-size caps.filecloud.com

The best choices depend on whether you want an all-in-one legal management suite, a dedicated legal document management system (DMS), or a secure standalone cloud/transfer platform.

1. Dedicated Legal Practice Management & Portals (All-in-One)

If you want case files tied directly to client communication, billing, and matter history without messy email chains:

• • Clio : Widely considered the gold standard for practice management. Its Clio for Clients portal allows you to share pleadings, discovery, and encrypted messages in a password-protected environment. Clients don't need a heavy login setup to view or upload files safely.
• • Filevine : Exceptional for heavy litigation and complex case files. It features robust client portals with bank-level encryption, granular permission controls, and tracking tools so you know precisely when a co-counsel or client has downloaded a large file.clinked.com
• • MyCase or PracticePanther : Great alternatives for small-to-midsize firms looking for intuitive, built-in secure client portals for document exchange and e-signatures.

2. Legal-Grade Document Management Systems (DMS)

If your primary need is heavy-duty document management, organization, and searchability rather than general practice management:

• • NetDocuments : Built specifically for the legal industry with bank-level security. It allows seamless, secure external sharing and collaboration with co-counsel or experts while maintaining compliance and audit trails.

3. Zero-Knowledge Cloud Storage & Secure Sync

If you prefer a secure repository where files are encrypted on your device before hitting the cloud (meaning not even the cloud provider can read them):sync.com

• • Sync.com : Offers zero-knowledge encrypted cloud storage that makes setting up secure links, password protection, and folder permissions very straightforward for legal files.sync.com
• • Box : Highly enterprise-secure, compliant (GDPR, HIPAA, etc.), and offers granular tiered permissions, making it widely accepted by larger firms and corporate legal departments for secure link-sharing.

Key Features to Insist On:

• Granular Permissions & Revocation: Ability to set expiration dates on links and revoke access if a co-counsel leaves the case or a file was shared in error.
• Audit Logging: Proof of transmission and access tracking for compliance and court records.filecloud.com
• No Size Restrictions: Capability of handling gigabyte-plus video depositions or massive discovery dumps without crashing or forcing compressed zip files.

To help narrow down the ideal fit, tell me:

• Do you already use a practice management software (like Clio or PracticePanther)?
• Are you primarily sharing with technically-challenged clients or co-counsel who need to co-edit?
• Roughly how large are the files you typically send?

For a law practice, I’d use a legal-focused client portal/document-sharing platform rather than email attachments or a consumer Dropbox folder. The key is not just encryption, but controlled access, revocation, authentication, audit logs, and appropriate vendor terms. The ABA’s guidance emphasizes that lawyers need to make reasonable efforts to prevent unauthorized disclosure and should evaluate the security and contractual safeguards of cloud vendors.American Bar Association+1

My shortlist

• iManage — Best if your firm already uses iManage Work. iManage Share lets you create controlled external folders for clients/co-counsel, with encryption, permissions, activity tracking, and integration with the firm's document-management system. Its newer collaboration functionality can provide time-limited guest access directly to the original document.Docs - iManage+2
• ShareFile — Probably my best general-purpose recommendation for a solo/small-to-mid-size law firm. It is designed around client portals, large-file transfers, document requests and external collaboration. ShareFile documents AES-256 encryption at rest, encrypted transfers, granular folder permissions and activity reporting.ShareFile+2
• Dropbox Business/Enterprise — Reasonable if your firm already has a properly administered business Dropbox environment, but I'd favor a legal-specific portal when client confidentiality and litigation workflows are central. Business tiers offer substantially more administrative/security controls than consumer Dropbox.Dropbox+2

How I'd configure it for case files

For each matter, create a dedicated workspace such as:

Matter → Client → Shared Documents

Then use separate permissions for:

• Client: view/download/upload as appropriate.
• Co-counsel: broader access to the shared working set.
• Experts/vendors: only the specific folders they need.
• Internal firm users: controlled access based on the matter.

I'd also require MFA, use expiring links where possible, disable anonymous/public links, retain download/access logs, and have a process for immediately revoking a person's access when the engagement or co-counsel relationship ends. The ABA specifically recommends MFA, logging and careful configuration of cloud services.American Bar Association

For particularly sensitive productions, I'd also consider encrypting the archive before upload and transmitting the decryption credential through a separate channel.

One important legal point

Don't treat a vendor's statement that it is "secure" or "SOC 2 compliant" as the end of the analysis. Your jurisdiction's ethics rules/opinions, the sensitivity of the matter, client instructions, contractual obligations, and the vendor's terms all matter. State bar guidance generally permits cloud storage when lawyers take reasonable precautions, but the lawyer remains responsible for protecting client confidentiality.American Bar Association+1

If you tell me roughly how your practice is set up (solo/small firm vs. larger firm, whether you already use Microsoft 365/iManage/Clio, typical file sizes, and whether you need clients to upload files as well as download them), I can narrow this to 2–3 options and compare security, pricing, ease of use, and litigation-specific features.

Sharing large, sensitive case files requires balancing strict confidentiality (maintaining attorney-client privilege) with ease of use for clients who might not be tech-savvy. Standard consumer cloud storage or unsecured email attachments fail to provide the granular access controls and audit trails required for ethical compliance.casepulse.com+1

The most secure and efficient solutions for law firms are categorized below by how they integrate into a practice:

1. Legal-Specific Document Management Systems (DMS)
   • NetDocuments : The gold standard for medium-to-large firms. Offers enterprise-grade security, ethical walls, zero-knowledge encryption, and robust handling of massive case files at scale.
   • iManage : Another heavyweight enterprise DMS utilized heavily by litigation practices for secure document collaboration and search.clinked.com+1
2. Practice Management Software with Built-in Portals
   • Clio : Excellent for small-to-medium firms. It bundles practice management, billing, and secure client-facing document sharing/portals into a single ecosystem.
   • MyCase or PracticePanther : Great alternatives that feature integrated, secure client portals specifically designed to bypass insecure email chains for evidence and discovery sharing.clinked.com+1
3. Secure Dedicated File Sharing & Portals
   • SmartVault : Known for high-security document storage and client portals with strict compliance frameworks, making it popular for document-heavy practices.
   • Clinked or FileCloud : Good standalone options providing branded secure portals, custom access permissions, and audit logs without needing a full practice management suite.filecloud.com+3
4. Enterprise Cloud with Advanced Security Controls
   • Microsoft SharePoint / OneDrive (Business) : If your firm is already deeply embedded in the Microsoft 365 ecosystem, properly configured SharePoint sites with Azure Information Protection offer strong encryption, expiration dates on links, and granular permission controls.
   • Box (Enterprise/Governance) : Offers robust compliance certifications, watermarking, and detailed audit trails suitable for legal work, though it requires careful administrative configuration.clinked.com+1

Key Features to Require:

• End-to-end encryption (both in transit and at rest).
• Granular permissions to restrict access to specific folders or files per client/co-counsel.
• Audit trails that log when a file is viewed, downloaded, or modified.
• Password protection and link expiration for any ad-hoc sharing.
• Revocable access so you can cut off access instantly if a case closes or co-counsel changes.filecloud.com+2

To help narrow down the best fit, tell me:

• What is the size of your firm (solo, small practice, or enterprise)?
• Do you already use a practice management tool (like Clio or PracticePanther) or a specific cloud ecosystem (like Microsoft 365)?

When sharing large case files, discovery bundles, or confidential evidence with clients and co-counsel, standard email attachments fall short due to size limits and ethical/compliance risks. You need a balance of bank-level encryption, granular permission controls, audit trails , and an interface that doesn't frustrate non-technical clients.

The top options vary depending on whether you are looking for a standalone sharing tool, full legal document management, or a practice management suite.

1. Dedicated Legal-Grade File Sharing & Portals

• NetDocuments: Widely considered a gold standard for cloud-based legal document management. It provides robust security, automated compliance checks, ethical walls, and secure external sharing links for co-counsel and clients without sacrificing control.
• ShareFile: Highly customizable and explicitly built for sharing large files. It provides end-to-end encryption, custom-branded client portals, and tracking features that show precisely when a recipient has downloaded a file.reddit.com+2
• TitanFile: Often described as "secure as email, but easier." It is designed specifically for legal professionals to send large case files and messages with compliance-grade encryption and a minimal learning curve for clients.

2. Practice Management Suites with Built-In Portals

• Clio (Clio for Clients): If you already use Clio Manage for your practice, you likely have access to their secure client portal. It allows clients and counsel to securely upload/download documents, communicate, and e-sign directly inside an encrypted environment.
• SmartVault: A strong choice if you want strict document organization by matter/case with robust access rules, audit trails, and compliance certifications (SOC 2 Type II, HIPAA) without the bloat of a full practice management system.

3. High-Security Cloud Storage (Zero-Knowledge)

• Tresorit: A Swiss-based zero-knowledge cloud storage and collaboration platform. Because it uses end-to-end encryption where only you and the recipient hold the keys, even the provider cannot read your files. You can set expiration dates on links and disable downloading for preview-only access.legaltoolguide.com

Key Features to Demand in Your Workflow:

1. Granular Permissions: Ability to revoke access instantly or set auto-expiring links for co-counsel when a matter concludes or a relationship changes.
2. Audit Logs: Verifiable logs showing when a file was accessed, viewed, or downloaded to satisfy evidentiary or compliance tracking.
3. No File Size Caps: Seamless handling of multi-gigabyte video depositions, financial records, or voluminous discovery productions.legaltoolguide.com

If you'd like to narrow this down, let me know:

• Do you currently use a Practice Management Software (like Clio or PracticePanther) or a Document Management System?
• Do you prefer a standalone tool just for transfers, or an all-in-one client portal?

For a law practice, I’d use a dedicated legal/enterprise document-sharing platform, rather than emailing attachments or relying on consumer-grade file links. The key is granular permissions, MFA, encryption, audit trails, expiration/revocation, and reliable backups.

The ABA’s guidance is essentially risk-based: lawyers can use cloud services, but should select reputable providers, take reasonable steps to preserve confidentiality, understand the security controls, maintain backups, and have a breach-response plan.American Bar Association+1

My shortlist

• Box — Probably my first choice for large litigation files. Its legal offering specifically supports matter collaboration, granular permissions, watermarking and audit trails. Box also offers customer-controlled encryption keys through KeySafe.Box+2
• Clio + Box/Dropbox — Particularly attractive if you want the file-sharing workflow integrated with matter management. Clio provides a secure client portal and permissions and integrates with Box, Dropbox, OneDrive, NetDocuments and Google Drive.Clio+1
• Dropbox Advanced/Business — Very easy for clients and co-counsel, and its current security architecture includes AES-256 encryption at rest, TLS in transit and MFA. For particularly sensitive matters, Dropbox also offers end-to-end-encrypted folders and audit capabilities, although there are tradeoffs with some governance features.Dropbox Help Center+3

How I'd configure it for case files

For each matter, I'd create a dedicated workspace with:

1. Separate client/co-counsel groups — don't share a common password or generic account.
2. MFA required for everyone.
3. Least-privilege permissions — e.g., client can access the production folder but not your internal work product.
4. Expiring links and revocable access for one-off recipients.
5. Download controls/watermarking where appropriate.
6. Audit logging so you can determine who accessed/downloaded material and when. Box, for example, maintains detailed security audit logs.Box
7. Version history and independent backups, particularly for irreplaceable discovery.
8. No sensitive files in ordinary email attachments; email the secure portal/link instead.
9. A written vendor/security review covering breach notification, data location, subcontractors, retention/deletion, subpoenas/government requests, and what happens when you terminate the service.

One important distinction: "encrypted" doesn't automatically mean "appropriate for privileged litigation material." You want to evaluate the entire system—including authentication, access controls, administrative access, logging, backups, deletion, and contractual confidentiality protections—not merely whether files are encrypted. The ABA specifically emphasizes evaluating the sensitivity of the information and the consequences of unauthorized disclosure.American Bar Association+1

If you tell me roughly how much data you're dealing with (e.g. 500 GB, 5 TB, 50 TB), whether you're solo/small firm or larger, and whether you need clients to upload files as well as download them, I can narrow this to 2–3 platforms and compare security, pricing, ease of client use, and litigation-specific features.