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Why are emailed attachments larger than the original file size?

  • Author of this Article - Jyoti Raut »
  • Published on September 09, 2010 @ 07:00PM PST |

Conclusion On Email attachment size - It may be possible that when you edit some attachments of your emails with any appropriate tools life pdf creater, word, notepad then those attachments which you have edit dissappear and you got the same atttachment without any edit information.

I am using windows live hotmail on web based interface and also using my yahoo mail account on outlook email program. But when ever i make changes on email aatchments on windows live hotmail emails and as well as on my yahoo mail emails they keep disappeared even when also when I save those documents from appropriate tool. I can't even understand why this is going with me. Can you tell me Where did my edited attachments go from my email?

Email attachment size

Here are some of the reasons which is responsible for making the size of attached file larger then the original file size.

  • Packet Switching
  • Binary form of file

Now We will take a look on those two reasons one by one.

Email attachments size increase because of packet switching

Packet Switching Is the technique at which transfer of data travel from one source node (computer or particular IP address) to the another deatination node. When we use packet switching technique to transfer data from one source to another destination then data of file devide into the shorter form of packet and for arranging those data at the destination node source node at the time of transfer put some headers into the packets of data which make the attached file more larger then the original size of the file.

Now a days packet switching techniques used on various transfer mode of data from source node to destination node.

Here are some of the fields which used packet switching as primary technique for tranferring data from one source to another.

  • Email attachments
  • TCP data transfer
  • FTP data transfer

Email attachments size increase because of Binary form of file

As we know that data transfer on internet as a binary form. So there are some encoding techniques have been used to send any format attachments over the internet. If we are sending any attachments of jpg image then one of jpg file will look on binary form much like given below row data.

ESliceBGColorType None topOutsetlong leftOutsetlong bottomOutsetlong
rightOutsetlong 8BIM( ?ð 8BIM 8BIM 8BIM D x à  á ( ÿØÿà JFI
éOáÆR?£N>ÊöL6ø¢kß+£Ð]Ÿà¬n,q»Î*ö=ù®ßãÿ +ŸÈÂÈᎂ2á¶§YÁ’؁1¸Ä	Üsõ^ŸˆA
òOÛK@>¥e?4×îóøw÷V[áCW4Ä¿á´·ÌæŠè‘,'öƒty m³Ò÷@é+P Iêeæ¾Ðq#6$Ñ
    

It may not be possible to arrange those files as same as it has been arranged on the source end at the time of sending the attachments, If the particular destination node decrypt the attachments with another format like it has to decrypt with 32 bit format but because the destination operating system and the processor using 64 bit format to decrypt the data then file size will increase automatically than the original file size.

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