Email attachments hit size limits. You need to send large files to clients, colleagues, or vendors. File transfer tools solve this problem, but capabilities and security vary dramatically.

I’ve tested major platforms with files ranging from 100MB to 50GB. Here’s what works reliably.

WeTransfer

Price: Free (up to 2GB), €12/month (Pro)

The simplest file transfer tool that everyone’s used. WeTransfer handles uploads up to 2GB free, sends download links via email, and requires no account for basic use.

The workflow is effortless – drag files, enter email addresses, add optional message, click transfer. Recipients get links valid for seven days. No account creation barriers for either party.

The free version includes WeTransfer branding and advertisements. Pro removes ads, increases limit to 200GB, allows custom backgrounds, and extends link validity to 30 days.

Security is basic – files are encrypted in transit but not end-to-end encrypted. Transfer links aren’t password protected on free tier. For sensitive files, additional security measures are necessary.

Performance is reliable. Upload speeds match my internet connection. Downloads work smoothly without failures.

Best for: Quick file transfers where convenience matters more than advanced security.

Dropbox Transfer

Price: Included with Dropbox (100MB free, up to 2GB with basic plans, up to 250GB with paid plans)

File transfer feature within Dropbox. Transfer creates temporary download links for large files without requiring recipients to have Dropbox accounts.

The integration with existing Dropbox storage is convenient. Files you’re already storing can be shared as transfers without re-uploading. Storage and transfer limits depend on your Dropbox plan tier.

Transfer links can be password-protected and have customizable expiry dates. Download notifications tell you when recipients accessed files. For Dropbox users, these features integrate naturally.

The limitation is requirement for Dropbox account. If you’re not already using Dropbox for storage, standalone transfer tools are simpler.

Best for: Dropbox users wanting to send large files from existing cloud storage.

Send Anywhere

Price: Free (10GB/transfer), $5.99/month (Plus)

Cross-platform file transfer using six-digit codes or links. Send Anywhere works across desktop, mobile, and web without account requirements.

The code-based transfer is distinctive. Generate a six-digit code, share it verbally or via message, recipient enters code and downloads files. For quick transfers where email isn’t convenient, this works well.

Link-based transfers work like traditional file sharing. Upload files, get shareable link, send to recipients. The free tier supports transfers up to 10GB, which exceeds most competitors’ free offerings.

Security includes optional password protection. End-to-end encryption is available. Transfer expiry is customizable.

Best for: Cross-platform transfers and situations where code-based sharing is convenient.

Firefox Send

Price: Free (1GB), $5/month (2.5GB)

Privacy-focused file transfer from Mozilla. Firefox Send emphasizes security – end-to-end encryption, password protection, download limits, and automatic expiration.

Files are encrypted before upload. Mozilla can’t access transferred content. Recipients decrypt files in browser using shared links. For privacy-sensitive transfers, this approach provides stronger security than competitors.

The interface is minimal. Upload files, set password and expiration, get link. No extra features or complexity. The simplicity is refreshing.

Transfer size limits are conservative – 1GB free, 2.5GB with account. For massive files, other tools support larger transfers.

Best for: Privacy-focused users transferring sensitive files with strong encryption requirements.

Filemail

Price: Free (50GB), $10/month (Business)

Generous free tier supporting transfers up to 50GB. Filemail handles large files without requiring accounts or subscriptions for basic use.

The web interface is straightforward. Upload files, enter recipient emails, send. Email-to-email transfer works for users who don’t want to deal with links or codes.

Business tier adds features like branding customization, increased storage, and team management. For individuals, the free tier is remarkably generous.

Security includes password protection and Outlook/Gmail integration for convenient workflow.

Best for: Large file transfers (up to 50GB) without cost barriers.

Tresorit Send

Price: Free (5GB), included with Tresorit storage plans

Zero-knowledge encrypted file transfer from privacy-focused cloud storage provider Tresorit. Send emphasizes security over convenience.

Files are end-to-end encrypted. Tresorit cannot access transferred content. Password protection and download limits provide additional security layers. For highly sensitive business files, the security model is appropriate.

The free tier supports 5GB transfers with strong encryption. Paid Tresorit storage plans include higher Send limits.

The focus on security means slightly more friction than convenience-focused tools. For appropriate use cases, this tradeoff is acceptable.

Best for: Businesses transferring sensitive files requiring zero-knowledge encryption.

Smash

Price: Free (unlimited size), €10/month (Smash Pro)

French file transfer service with unlimited file sizes on free tier. Smash removes size restrictions entirely for free users while monetizing through premium features.

The unlimited free transfers are genuinely unlimited. I tested with 45GB files without issues. Upload speeds were good, downloads worked reliably.

Pro features include password protection, custom branding, and transfer analytics. Free tier users get basic transfer functionality without security enhancements.

For very large files where cost is concern, Smash’s unlimited free tier is compelling.

Best for: Very large file transfers without budget for paid services.

OnionShare

Price: Free (open source)

Privacy tool that transfers files directly between computers using Tor network. OnionShare creates temporary web servers for file sharing without uploading to third-party services.

The security model is maximum privacy – no third-party servers, no data storage, direct peer-to-peer transfer over Tor. For extremely sensitive files, this approach eliminates cloud service risks.

The tradeoff is complexity. Both sender and recipient need OnionShare installed. Transfers require both parties to be online simultaneously. Performance over Tor is slower than direct internet connections.

For normal business file transfers, this is overkill. For whistleblowers, journalists, or extremely sensitive contexts, the security model is appropriate.

Best for: Maximum-privacy scenarios where third-party services are unacceptable.

Resilio Sync

Price: Free (personal use), $99 one-time (individuals), custom (business)

Peer-to-peer file sync and transfer using BitTorrent protocol. Resilio transfers files directly between devices without cloud intermediaries.

The speed is excellent for large files between well-connected devices. No upload/download bottlenecks from cloud services. Direct device-to-device transfer uses full bandwidth.

Setup complexity is higher than cloud services. Both parties need Resilio installed. Permissions and folder configuration require technical understanding.

For regular large file transfers between known parties, Resilio’s direct transfer approach is efficient. For occasional transfers to varying recipients, cloud services are simpler.

Best for: Regular large file transfers between known parties with technical capability.

My Testing Methodology

I transferred identical file sets (ranging from 500MB to 50GB) using each service, measuring upload/download speeds, reliability, and user experience friction.

Fastest transfers: Resilio Sync (direct P2P), Filemail, WeTransfer Most reliable: WeTransfer, Dropbox Transfer, Send Anywhere Easiest workflow: WeTransfer, Send Anywhere Strongest security: Tresorit Send, Firefox Send, OnionShare

My Recommendations

For quick, simple transfers: WeTransfer for ease of use with adequate free tier.

For Dropbox users: Dropbox Transfer for integration with existing storage.

For large files free: Filemail (50GB) or Smash (unlimited) for generous free limits.

For privacy focus: Tresorit Send or Firefox Send for strong encryption.

For maximum privacy: OnionShare for peer-to-peer transfer over Tor.

For regular large transfers: Resilio Sync for efficient direct sync between devices.

Security Considerations

File transfer security varies dramatically:

End-to-end encrypted: Tresorit Send, Firefox Send, OnionShare Encrypted in transit: WeTransfer, Dropbox Transfer, Send Anywhere Additional security: Password protection, download limits, expiry settings

Match security level to file sensitivity. Client contracts need stronger security than casual photo sharing.

The Size Limit Reality

Free tier limits:

• WeTransfer: 2GB
• Send Anywhere: 10GB
• Firefox Send: 1GB
• Filemail: 50GB
• Smash: Unlimited
• Dropbox Transfer: Varies by plan

For occasional large transfers, Filemail or Smash’s free tiers suffice. For regular large transfers, paid services or direct sync tools make sense.

Speed Matters for Large Files

Upload/download speeds depend on:

• Your internet connection (primary factor)
• Service’s server capacity
• Geographic distance to servers
• Current server load

In testing, differences between major services were minimal. Your internet connection matters more than service choice for transfer speed.

Final Thoughts

For most users, WeTransfer provides the best balance of simplicity and capability. The 2GB free limit handles most common transfers, and the workflow is effortless.

Filemail offers the most generous free tier at 50GB. Smash removes size limits entirely for free users.

For sensitive files, Firefox Send or Tresorit Send provide stronger security. For maximum privacy, OnionShare’s peer-to-peer approach eliminates third-party risks.

Choose based on file sizes, security requirements, and usage frequency. Test free tiers before paying for features you might not need.

The best file transfer tool is the one that reliably delivers files without frustrating either party.