How to Email Large Files to Suppliers in China (Without Getting Blocked)

You've finalized the product specs, packed the CAD drawings into a ZIP, and hit "send" to your manufacturer in Shenzhen. A few hours later, you get a reply: "We didn't receive any file." You sent a Google Drive link. They can't open it. You try Dropbox. Blocked. OneDrive? Same result. Welcome to the reality of sending files across the Great Firewall.

For international businesses working with Chinese suppliers, factories, and partners, sending large files by email should be simple. In practice, it's one of the most frustrating parts of cross-border collaboration. Cloud sharing services that work perfectly in the US, Europe, or Southeast Asia are either blocked, throttled, or unusable in mainland China.

SendSplit eliminates this problem. It delivers files up to 200MB as real email attachments — not cloud links — that arrive directly in your Chinese supplier's inbox. No VPN required. No blocked links. No expired downloads.

Why Your Files Aren't Getting Through to China

The core issue is straightforward: most Western cloud services are blocked or severely restricted in mainland China.

• Google Drive — Completely blocked in China. Links return errors or time out. Your supplier simply cannot access them.
• Dropbox — Blocked since 2014. Sharing links are inaccessible without a VPN.
• OneDrive — Partially accessible but extremely slow. Large file downloads frequently fail or time out.
• iCloud — Apple's iCloud Drive links work intermittently but face speed issues. Not reliable for business-critical files.
• WeTransfer — Blocked in China. Download pages are inaccessible.

Even when a cloud service technically works, the cross-border internet connection between China and the rest of the world is heavily congested. A file that downloads in seconds from a US server may take hours — or fail entirely — when accessed from behind the Great Firewall.

Meanwhile, Chinese email services (QQ Mail, 163 Mail, Alibaba Mail) work perfectly for receiving real email attachments. The attachment lands directly in their mailbox with no external service dependency.

How SendSplit Solves Cross-Border File Delivery

SendSplit bypasses cloud services entirely. Instead of sharing a link that might be blocked, it delivers your file as real email attachments that work with every email provider — Gmail, Outlook, QQ Mail, 163 Mail, or any corporate mail system.

What Files Do International Businesses Send to China?

Cross-border B2B communication involves large files at every stage:

• Product design files — CAD drawings (DWG, STEP, IGES), 3D models (STL, OBJ), technical illustrations
• Product specifications — Detailed PDF documents with dimensions, materials, tolerances, and compliance requirements
• Sample photos and videos — High-resolution images of prototypes, defect reports, or quality inspection footage
• Contracts and legal documents — Signed agreements, NDAs, purchase orders, customs declarations
• Marketing materials — Product photos for packaging, catalog layouts, brand guidelines
• Testing and certification — Lab reports, compliance certificates (CE, FCC, UL), test data files

Why Not Just Use a Chinese Cloud Service?

You might consider uploading to a Chinese cloud service like Baidu Pan or WeChat file transfer. But:

• Account required — You need a Chinese phone number to register for most Chinese cloud services
• Interface in Chinese — Navigation and upload processes are entirely in Mandarin
• WeChat limitations — File transfers expire after a few days and have their own size limits
• Not professional — Sending business files through social messaging apps doesn't meet enterprise compliance standards
• Privacy concerns — Uploading sensitive designs and contracts to unfamiliar cloud platforms raises IP protection questions

SendSplit keeps things simple: you upload, it delivers real attachments. Files are processed temporarily and automatically deleted after delivery. Optional password protection secures sensitive intellectual property.

Tips for Sending Files to China

• Use 10MB or 20MB splits — Chinese email providers (QQ Mail, 163 Mail) cap attachments at 25MB. Splitting at 20MB ensures every part arrives without being rejected.
• Avoid cloud links entirely — Even if a service "sometimes works" in China, don't risk it for business-critical files. Real attachments are 100% reliable.
• Send during Chinese business hours — Email servers in China process attachments faster during normal operating hours (UTC+8).
• Include a brief note — Tell your supplier to expect multiple emails with attachments and to download all parts before extracting.
• Bookmark SendSplit — Save sendsplit.com/upload-to-send for regular use. No account needed for basic sending.

Who Needs This?

• Product sourcing managers sending specifications and design files to factories in Guangdong, Zhejiang, or Jiangsu
• Import/export companies sharing customs documentation, certificates, and contracts with Chinese logistics partners
• Industrial designers delivering CAD packages and 3D models to Chinese manufacturing partners
• Quality control teams sending inspection reports, defect photos, and testing data to suppliers
• Marketing teams sharing high-resolution product photos, video assets, and brand guidelines with Chinese printers or packaging manufacturers
• Legal and compliance teams exchanging signed contracts, NDAs, and regulatory filings

Stop losing files to the Great Firewall. Try SendSplit — send files up to 200MB as real email attachments that arrive directly in your Chinese supplier's inbox. No cloud links. No VPN required.