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Ext3 filesystems used 32-bit addressing, limiting them to 2 TiB files and 16 TiB filesystems (assuming a 4 KiB blocksize; some ext3 filesystems use smaller blocksizes and are thus limited even further).
Ext4 uses 48-bit internal addressing, making it theoretically possible to allocate files up to 16 TiB on filesystems up to 1,000,000 TiB (1 EiB).
