THE PROBLEM
Your network is fast. Your file transfer isn’t.
A fast link does not guarantee a fast file transfer. Across continents, latency, packet loss, VPN overhead, and TCP congestion control can turn hundreds of gigabytes — or terabytes — into hours of waiting.
CROSSBOW was built for exactly this problem.
Actual CROSSBOW operation. Open the original video on YouTube
THE SOLUTION
Move large files directly — and keep them moving.
CROSSBOW transfers large files directly between your endpoints: offices, partners, data centers, and remote locations. No cloud upload and no relay server in the data path.
Instead of allowing packet loss and long round-trip times to collapse transfer speed, CROSSBOW is designed to keep data flowing and use the bandwidth you already have.
It can also operate inside isolated networks where internet access is unavailable.
THE TECHNOLOGY
We did not tune around TCP. We built our own transfer engines.
CROSSBOW is built around two proprietary engines developed in-house: MKUDP and MKFFT. Together they form a transfer stack designed specifically for very large files on high-latency, lossy, and long-distance networks.
A reliable high-speed UDP transport engine designed to recover packet loss without forcing the entire transfer to slow down the way conventional TCP flows can.
The large-file transfer layer that manages data movement, integrity verification, and resumable transfer on top of MKUDP.
Direct P2P — your files travel endpoint to endpoint, without our infrastructure in the data path.
End-to-end ChaCha20 — encryption is built for high-speed transfer without becoming the bottleneck.
Integrity + resume — received files are verified, and interrupted work can continue without starting over.
WHAT CHANGES
Spend less time watching progress bars. More time finishing the work.
When file transfer stops being the bottleneck, teams no longer have to build their workflow around overnight uploads, repeated retries, or cloud staging.
Move sooner
Transfers can run at the speed your available network can actually deliver — up to 30× faster than FTP in suitable environments.
Recover without drama
Pause, resume, verify, and continue instead of restarting massive transfers from zero.
Keep data under control
Sensitive files stay between your endpoints rather than being uploaded to third-party cloud storage.
Keep costs predictable
One server license can serve unlimited partners and clients, with no usage-based data charges.
REAL-WORLD USE
Other production teams had the same problem.
CROSSBOW has been used in real production workflows since 2021 by teams that could not afford to let large-file transfer become the slowest part of the job.
For these teams, the goal was simple: move large files reliably, keep control of the data path, and spend less time waiting for transfers to finish or recover.
Teams and partners that have used CROSSBOW include:
LVLY · OTHER · WAX · COMPASS STUDIO KOREA · ROOM121 · Radio Kiev · FRAMEWORK · CHEIL · WHITEHOUSEPOST · Pneuma Works · and more
FREE EVALUATION
Don’t take our word for it. Test CROSSBOW on your own network.
We offer a free evaluation so you can judge CROSSBOW with the only test that really matters: your endpoints, your files, and your network conditions.
Measure the transfer speed. Interrupt it. Resume it. Run it across the route that gives you trouble today. Then decide whether CROSSBOW belongs in your workflow.