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#1
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If .xlsx is a zip archive, why does zipping it reduce file size?
I have a large and complex Excel workbook, with perhaps 20 large sheets. All
redundant data, cells etc have been removed. When saves as .xlsx it occupies almost 3MB of disk space. However, if I compress it to a .zip or a .rar, using any standard tool, it reduces to about 25% of that, under 700MB. As .xlsx is already a zip archive, why can it be so massively further reduced in size? Zipping a zip usually has no effect or even increases the size. Why arent Microsoft using a more efficient compression technique? File size can be a problem when trying to email, for example, multiple versions of the file. |
#2
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If .xlsx is a zip archive, why does zipping it reduce file size?
This is taken from my notebook - sorry I did not record its source
---------------------------- To reduce the workbook size: 1. Press Ctrl+End to find the last cell in the used area within the sheet. In the screenshot, the last cell is E17. 2. Find the last cell containing data in the sheet. In the screenshot, the last cell containing data is cell C11. 3. Delete all the rows between the cells containing data to the row of the last cell in the used area. In the screenshot, the rows to delete are 12:17. 4. Delete all columns to the right of the column of the last cell containing data, up to the column of the last cell in the area used. In the screenshot, the columns to delete are D:E. 5. To quickly delete the rows, select the first row to delete (row 12 in the screenshot), press Ctrl+Shift+Down Arrow. To quickly delete the columns, select the first column to delete (column D in the screenshot), and press Ctrl+Shift+Right Arrow, press Shift+F10 and from the shortcut menu, press Delete. 6. Repeat the steps above for each sheet in the entire workbook. 7. Press Ctrl+S to save the file. ------------------------------- best wishes Bernard V Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme remove caps from email "Welsh Wizard" <Welsh wrote in message ... I have a large and complex Excel workbook, with perhaps 20 large sheets. All redundant data, cells etc have been removed. When saves as .xlsx it occupies almost 3MB of disk space. However, if I compress it to a .zip or a .rar, using any standard tool, it reduces to about 25% of that, under 700MB. As .xlsx is already a zip archive, why can it be so massively further reduced in size? Zipping a zip usually has no effect or even increases the size. Why aren't Microsoft using a more efficient compression technique? File size can be a problem when trying to email, for example, multiple versions of the file. |
#3
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If .xlsx is a zip archive, why does zipping it reduce file siz
You haven't ansered the question at all - see subject line and my final
paragraph. I thought I made it clear that I had taken all steps, such as you suggest, to reduce file size. I am not looking for file size reduction advice in terms of the Excel contents, though others mght not know how to do this. "Bernard Liengme" wrote: This is taken from my notebook - sorry I did not record its source ---------------------------- To reduce the workbook size: 1. Press Ctrl+End to find the last cell in the used area within the sheet. In the screenshot, the last cell is E17. 2. Find the last cell containing data in the sheet. In the screenshot, the last cell containing data is cell C11. 3. Delete all the rows between the cells containing data to the row of the last cell in the used area. In the screenshot, the rows to delete are 12:17. 4. Delete all columns to the right of the column of the last cell containing data, up to the column of the last cell in the area used. In the screenshot, the columns to delete are D:E. 5. To quickly delete the rows, select the first row to delete (row 12 in the screenshot), press Ctrl+Shift+Down Arrow. To quickly delete the columns, select the first column to delete (column D in the screenshot), and press Ctrl+Shift+Right Arrow, press Shift+F10 and from the shortcut menu, press Delete. 6. Repeat the steps above for each sheet in the entire workbook. 7. Press Ctrl+S to save the file. ------------------------------- best wishes Bernard V Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme remove caps from email "Welsh Wizard" <Welsh wrote in message ... I have a large and complex Excel workbook, with perhaps 20 large sheets. All redundant data, cells etc have been removed. When saves as .xlsx it occupies almost 3MB of disk space. However, if I compress it to a .zip or a .rar, using any standard tool, it reduces to about 25% of that, under 700MB. As .xlsx is already a zip archive, why can it be so massively further reduced in size? Zipping a zip usually has no effect or even increases the size. Why aren't Microsoft using a more efficient compression technique? File size can be a problem when trying to email, for example, multiple versions of the file. |
#4
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If .xlsx is a zip archive, why does zipping it reduce file siz
I apologize! Just want to be sure you had minimized file size,
best wishes and peace -- Bernard V Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme remove caps from email "Welsh Wizard" wrote in message ... You haven't ansered the question at all - see subject line and my final paragraph. I thought I made it clear that I had taken all steps, such as you suggest, to reduce file size. I am not looking for file size reduction advice in terms of the Excel contents, though others mght not know how to do this. "Bernard Liengme" wrote: This is taken from my notebook - sorry I did not record its source ---------------------------- To reduce the workbook size: 1. Press Ctrl+End to find the last cell in the used area within the sheet. In the screenshot, the last cell is E17. 2. Find the last cell containing data in the sheet. In the screenshot, the last cell containing data is cell C11. 3. Delete all the rows between the cells containing data to the row of the last cell in the used area. In the screenshot, the rows to delete are 12:17. 4. Delete all columns to the right of the column of the last cell containing data, up to the column of the last cell in the area used. In the screenshot, the columns to delete are D:E. 5. To quickly delete the rows, select the first row to delete (row 12 in the screenshot), press Ctrl+Shift+Down Arrow. To quickly delete the columns, select the first column to delete (column D in the screenshot), and press Ctrl+Shift+Right Arrow, press Shift+F10 and from the shortcut menu, press Delete. 6. Repeat the steps above for each sheet in the entire workbook. 7. Press Ctrl+S to save the file. ------------------------------- best wishes Bernard V Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme remove caps from email "Welsh Wizard" <Welsh wrote in message ... I have a large and complex Excel workbook, with perhaps 20 large sheets. All redundant data, cells etc have been removed. When saves as .xlsx it occupies almost 3MB of disk space. However, if I compress it to a .zip or a .rar, using any standard tool, it reduces to about 25% of that, under 700MB. As .xlsx is already a zip archive, why can it be so massively further reduced in size? Zipping a zip usually has no effect or even increases the size. Why aren't Microsoft using a more efficient compression technique? File size can be a problem when trying to email, for example, multiple versions of the file. |
#5
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If .xlsx is a zip archive, why does zipping it reduce file size?
First, I have no idea.
Second, I know that there are zip programs that ask you want you want--smallest file size and fastest speed or larger size and slower speed (and options between these two). Maybe it's just a choice that MS made to keep the time to create/update the file reasonable. Welsh Wizard wrote: I have a large and complex Excel workbook, with perhaps 20 large sheets. All redundant data, cells etc have been removed. When saves as .xlsx it occupies almost 3MB of disk space. However, if I compress it to a .zip or a .rar, using any standard tool, it reduces to about 25% of that, under 700MB. As .xlsx is already a zip archive, why can it be so massively further reduced in size? Zipping a zip usually has no effect or even increases the size. Why arent Microsoft using a more efficient compression technique? File size can be a problem when trying to email, for example, multiple versions of the file. -- Dave Peterson |
#6
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If .xlsx is a zip archive, why does zipping it reduce file size?
Oops.
The programs ask you if you want the smallest size and slowest speed or larger size and faster speed. Dave Peterson wrote: First, I have no idea. Second, I know that there are zip programs that ask you want you want--smallest file size and fastest speed or larger size and slower speed (and options between these two). Maybe it's just a choice that MS made to keep the time to create/update the file reasonable. Welsh Wizard wrote: I have a large and complex Excel workbook, with perhaps 20 large sheets. All redundant data, cells etc have been removed. When saves as .xlsx it occupies almost 3MB of disk space. However, if I compress it to a .zip or a .rar, using any standard tool, it reduces to about 25% of that, under 700MB. As .xlsx is already a zip archive, why can it be so massively further reduced in size? Zipping a zip usually has no effect or even increases the size. Why arent Microsoft using a more efficient compression technique? File size can be a problem when trying to email, for example, multiple versions of the file. -- Dave Peterson -- Dave Peterson |
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