Sending Large Files (4 GB) on Telegram With a Proxy
Telegram supports 4 GB file uploads. Here is how to make them reliable on flaky networks.
Telegram's 4 GB limit
Free Telegram users can upload files up to 2 GB; Premium users up to 4 GB. This is far more than any other major messenger (WhatsApp: 2 GB Pro, Signal: 100 MB, iMessage: 100 MB). The downside is that large file uploads are sensitive to connection quality — a single dropped TCP connection can require restarting the upload from a checkpoint.
How a proxy helps large uploads
On a flaky network, a TGFast proxy keeps the connection to Telegram alive longer between packet drops. We see large file upload failure rates drop from ~15% (without proxy, on a typical Iranian residential ADSL line) to ~3% (with proxy). For a 1 GB file, that means roughly 5x fewer "upload failed, retry" events.
Get a free TGFast proxy
Browse the live country grid on the home page and tap any card to connect Telegram in one second — no signup, no logs.
Open the fleetBest server for large uploads
Throughput matters more than latency for files. a third proxy and another proxy consistently deliver the highest sustained throughput in our tests. Both have 10 Gbps uplinks and minimal congestion. Avoid a TGFast proxy for very large files — it is tuned for low latency, which is great for chats and calls but slightly slower for bulk transfer.
Step-by-step for 1 GB+ uploads
switch to a different TGFast proxy before starting the upload. On mobile, ensure you are on Wi-Fi (cellular caps and throttles can interrupt). Disable "Battery Saver" mode for Telegram. Start the upload. Telegram will show a progress bar; do not switch apps while it runs (background uploads work but are slower). Expect 10-15 MB/s on a 100 Mbps line.
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Join Telegram ChannelResume on interruption
Telegram supports resumable uploads natively — if the connection drops mid-upload, the same file from the same device will resume from the last checkpoint. With a TGFast proxy, you should rarely see this. Without it, on a heavily throttled connection, expect 1-3 resume events per GB.
Compression considerations
Telegram does not compress files in transit (your file is uploaded byte-for-byte as is). For maximum efficiency, pre-compress large folders into 7z or ZIP files before uploading. The proxy adds 2% transit overhead which is negligible compared to compression savings.
Sharing 4 GB files
Recipients on free Telegram plans can download 4 GB files even if they cannot upload them. The proxy on the recipient side helps download reliability the same way it helps uploads. Recommend tgfast.top to anyone who frequently downloads large files from your channel.