# Hide Text in Image Online - Steganography with Password

> Free online image steganography: hide a message in the least significant bits of a PNG, optionally AES-256 encrypted, and reveal hidden text again.

- URL: https://qilingtools.com/en/image/steganography
- Category: Image Tools (https://qilingtools.com/en/image)
- Tags: [Image](https://qilingtools.com/en/tags/image), [Privacy & Security](https://qilingtools.com/en/tags/privacy)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

Steganography hides information inside an ordinary-looking picture. This tool writes your text into the lowest bit of each pixel's red, green and blue values — a change of at most 1/255 that the eye cannot see. A 1000×1000 image holds roughly 370,000 bytes. Add a password and the text is encrypted with AES-256-GCM (key derived with PBKDF2) before it is written, so it can't be read without the password even by someone who knows the method. Switch to Reveal and choose the PNG to read the message back. Hidden data is fragile: compressing, resizing, converting to JPG or sending through chat apps destroys it, so share the original PNG as a file.

## How to use

1. Choose Hide text, upload an image, and enter your message and optional password
2. Click Create image and download the PNG
3. The recipient chooses Reveal text, uploads the PNG and enters the password if there is one

## Features

- Least-significant-bit hiding, image looks unchanged
- Optional password with AES-256-GCM encryption
- Shows capacity; UTF-8 text including emoji
- Hiding and revealing run locally

## FAQ

### Why can't the hidden text be read?

Make sure you are using the original PNG exported by this tool. Compression, cropping, resizing, screenshots or sending via chat apps rewrite the lowest bits and the message is lost.

### Is steganography secure?

Without a password, anyone who knows the technique can read the text. With a password the content is AES-256 encrypted and only readable with the password. Steganography hides that a message exists; it is not a replacement for proper encrypted messaging.

### Are my files uploaded?

No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.

### Do I need to sign up or pay?

No. The site is completely free, needs no account, has no usage limits and adds no watermark.

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