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PNG Chunks

Tool to extract and understand the PNG format chunks. The PNG (Portable Network Graphics) image format consists of multiple pieces of data (header, image, meta information, or hidden content).

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PNG Chunks -

Tag(s) : Image Processing

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PNG Chunks

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PNG Chunk Extraction

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Tool to extract and understand the PNG format chunks. The PNG (Portable Network Graphics) image format consists of multiple pieces of data (header, image, meta information, or hidden content).

Answers to Questions

What is a PNG chunk?

PNG (Portable Network Graphics) files are composed of several parts, the chunks. Generally a file has a header, a content and an end. The PNG format also has its specification the ability to integrate a comment area chunk, compressed or not, which is usually unreadable without a dedicated software.

How to read a tEXt chunk?

The tEXt chunk is readable directly in the file (in a text editor or an hexadecimal editor), it starts with tEXt (74455874 in hexadecimal ascii), followed by a title, and a free comment area.

Example: TEXt => My Title This is a PNG comment

How to read a zTXt chunk?

The zTXt chunk is similar to tEXt except that its content is compressed with DEFLATE. Find in the file zTXt (7a545874 in hexadecimal ascii), followed by a title, and a binary area not readable directly (because compressed), that zone must be decompressed before being able to read the message.

Source code

dCode retains ownership of the online 'PNG Chunks' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (PHP, Java, C#, Python, Javascript, Matlab, etc.) no data, script or API access will be for free, same for PNG Chunks download for offline use on PC, tablet, iPhone or Android !

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Thanks to your feedback and relevant comments, dCode has developped the best 'PNG Chunks' tool, so feel free to write! Thank you !


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