Image Text Hiding Tool

A digital steganography-based image text hiding tool that embeds secret text into images or extracts information from images with hidden text. Supports password protection and multi-level hiding strength.

What is Digital Steganography

Digital steganography is a technique for hiding information within digital media (images, audio, video) by modifying non-critical data bits to embed secret information. This makes hidden content visually imperceptible. This tool embeds text data by fine-tuning the least significant bits of image pixels, making differences between original and modified images invisible to the naked eye.

Key Features

• Bidirectional Operation: Supports write mode (hide text) and read mode (extract text)
• Password Protection: Optional password encryption ensuring only those with password can read content
• Adjustable Strength: Provides 0-5 levels of hiding strength, balancing capacity and stealth
• Format Preservation: Outputs PNG format images ensuring hidden information isn't lost
• Instant Preview: Can directly preview and download images with hidden text after writing

How to Use

Hide Text (Write Mode)

1. Upload Image: Click or drag image to upload area (supports common formats)
2. Input Text: Enter text to hide in input box
3. Set Password (optional): Set password in password box to encrypt text
4. Adjust Level: Adjust hiding level (0-5, higher numbers = greater capacity but lower stealth) based on needs
5. Click Hide: Click "Hide Text" button to start processing
6. Download Image: Click download button after processing to save image with hidden text

Extract Text (Read Mode)

1. Switch Mode: Switch mode to "Read"
2. Upload Image: Upload image containing hidden text
3. Enter Password: If password was set, enter same password in password box
4. Click Read: Click "Read Text" button to extract hidden text
5. View Result: Extracted text displays in result area

Parameter Explanation

Level Description

• Level 0: Lowest strength, smallest capacity, least detectable
• Levels 1-2: Low strength, suitable for hiding small amounts of text
• Level 3: Medium strength, balanced capacity and stealth (recommended)
• Level 4: High strength, can hide more text
• Level 5: Highest strength, maximum capacity but may produce slight visible noise on some images

Password Protection

After setting password, tool encrypts text before embedding in image. Only entering correct password allows decrypting and extracting hidden text. Using strong passwords effectively prevents information leakage.

Application Scenarios

Information Security

• Covert transmission of sensitive data
• Copyright watermark embedding
• Digital signature hiding

Privacy Protection

• Personal privacy information backup
• Password and account information storage
• Confidential document marking

Creative Entertainment

• Treasure map and puzzle design
• Escape room clues
• Scavenger hunt hints

Educational Demonstration

• Cryptography teaching cases
• Information security course demonstrations
• Digital steganography principle display

Important Notes

1. Image Format: Images after hiding must be saved as PNG format; other formats (like JPEG) compress data causing information loss
2. Image Modification: Don't crop, scale, compress, or otherwise modify images with hidden text as this destroys hidden data
3. Capacity Limits: Amount of text images can hide depends on image size and level settings
4. Password Management: Forgetting password makes hidden text unrecoverable; keep passwords safe
5. Visual Impact: Levels 4-5 may produce slight noise on some solid or gradient images
6. Character Encoding: Supports all Unicode characters including Chinese, emoji, etc.
7. Browser Processing: All operations complete locally in browser; images don't upload to servers

Technical Principles

This tool uses LSB (Least Significant Bit) steganography:

1. Data Embedding: Converts text to binary, modifies image pixels' least significant bits
2. Password Encryption: Uses password to generate key, encrypts text before embedding
3. Capacity Control: Level parameter determines how many bits of each pixel to use for data storage
4. Data Recovery: Reads pixels' specific bits, reconstructs binary data and decrypts

Common Issues

Q: Why does reading show "No hidden text detected"$1

A: Possible reasons: 1) Image doesn't contain hidden text; 2) Image was compressed or modified; 3) Password is incorrect; 4) File format conversion caused data loss.

Q: Can hidden images be detected$2

A: Using low levels (0-3), ordinary statistical analysis has difficulty detecting. However, professional steganography analysis tools may identify anomalies.

Q: Can files be hidden instead of text$3

A: Current version only supports text. To hide files, first convert file to Base64 text, but capacity requirements greatly increase.