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How can a Single Picture Show your Information

This article is about a format for storing metadata in image.

If you not aware posting picture allows anyone to know your information called metadata which may contain in EXIFinfo like location, device that use to take a picture , time and date it was taken

Exchangeable image file format  (Exif, often incorrectly EXIF
is a standard that specifies the formats for images, sound, and ancillary tags used by digital cameras (including smartphones), scanners and other systems handling image and sound files recorded by digital cameras. The specification uses the following existing file formats with the addition of specific metadata tags: JPEG Discrete cosine transform (DCT)for compressed image files, TIFF Rev. 6.0 (RGB or YCbCr) for uncompressed image files, and RIFF WAV for audio files (Linear PCM or ITU-T G.711 μ-Law PCM for uncompressed audio data, and IMA-ADPCM for compressed audio data). It is not supported in JPEG 2000, PNG, or GIF.
This standard consists of the Exif image file specification and the Exif audio file specification.

There are many  software online metadata and exif viewer  for free, you can search the keyword "image metadata viewer" on Google .

Example is metapicz.com  you can just paste the picture direct link or upload to get the metadata.

Here is some information  example only if your phone is GPS enabled your stalker can fallow you.

Privacy and security

Since the Exif tag contains information about the photo, it can pose a privacy issue. For example, a photo taken with a GPS-enabled camera can reveal the exact location and time it was taken, and the unique ID number of the device - this is all done by default - often without the user's knowledge. By removing the Exif tag with software such as ExifTool before publishing, the photographer can avoid possible problems. Many users may be unaware that their photos are tagged in this manner. A whistleblower, journalist or political dissident relying on the protection of anonymity to allow them to report malfeasance by a corporate entity, criminal, or government may find their safety compromised by this default data collection.

In December 2012, anti-virus programmer John McAfee was arrested in Guatemala while fleeing from alleged persecution in Belize, which shares a border. Vice magazine had published an exclusive interview with McAfee "on the run" that included a photo of McAfee with a Vice reporter taken with an iPhone 4S smart phone.The photo's metadata included GPS coordinates locating McAfee in Guatemala, and he was captured two days later.

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