STEP 1. you need to download a software called s-tools .
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STEP 2. search an image in which you want to hide your secret file . image must be in bmp or gif format. jpeg is not compatible .

STEP 3.if you have bmp image then good . else you can convert your image into bmp online .convertor
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STEP 4. open your s-tools and drop your bmp image . as below example .
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STEP 5. drag and drop your file .
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STEP 6. now type in the password to secure it .
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STEP 7. you will get another image with your secret file hidden in it . now go ahead and save it.
keep it with you or send it to your friend .

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HOW TO REVEAL YOUR HIDDEN FILE ?
just open your new bmp image with s-tools . right click on it and click on reveal . type in your password and you will get your hidden file .
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TIP : you can even hide file in music file (wav format only) .