Secure data transmission is increasingly vital amid rising cyber threats. This paper proposes a hybrid system combining cryptographic and steganographic techniques, implemented through a user interface for practical use. Users upload multipart documents, optionally compressed through zip, then encrypted with AES-256 for confidentiality. The AES key is encrypted using RSA for enhanced security. Both encrypted data and keys are embedded into a cover image using Discrete Wavelet Transform (DWT) steganography, chosen for its robustness. At the receiver end, the stego-image is processed to extract and decrypt the data, recovering the original files. Preliminary results show strong resistance to statistical attacks and high image quality (PSNR > 38 dB). This approach integrates symmetric and asymmetric cryptography with advanced steganography, offering a scalable solution for secure document sharing in sensitive applications, such as corporate and governmental communication.