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File format examples

Here are a selection of sample images showing what effect the different formats have on a test image:


Here we have the original image file saved as a PNG24:
PNG24 image sample PNG24 image sample
68.2Kb 2.25Kb
Note: TIFF files are slightly larger, but unfortunately Mozilla doesn't support them...

Here we have the original image file saved as a GIF:
GIF image sample GIF image sample
25.8Kb 0.86Kb
Note: GIF files are smaller and lossless, but they only support a maximum of 256 colours. There were legal issues surrounding the format for a while...

Here we have the file saved as a high quality JPEG:
JPEG image sample, quality 60 JPEG image sample, quality 60
15Kb 2.02Kb


Here we have the file saved as a medium quality JPEG:
JPEG image sample, quality 30 JPEG image sample, quality 30
7.37Kb 1.47Kb


Here we have the file saved as a low quality JPEG:
JPEG image sample, quality 10 JPEG image sample, quality 10
4.4Kb 1.19Kb


Here's what happens when you save a JPEG several (approximately 5) times:
Resaved JPEG image sample, quality 10 Resaved JPEG image sample, quality 10
2.01Kb 0.8Kb


JPEG is the best standard to use for saving images on the web, however JPEG compression is lossy - this means that every time you save as JPEG some image information is lost. Fine detail is usually the first thing to be discarded. JPEG losses are cumulative, so do not save JPEG files repeatedly - if you have a JPEG original, and need to manipulate it in a number of steps use something like TIFF or PNG24 for intermediate saves if possible. Since the human eye is most sensitive to green (and least sensitive to blue) JPEG compression tends to discard blue information first. Never overwrite your original.

If you need to save text as a graphic or logos for use on the internet consider using something like GIF or PNG. Which format is the best choice varies depending on how many colours your original artwork contains. GIF only supports 256 colours (8-bit), whereas there's a 24bit version of the PNG standard.


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