failed to read PNG signature: file does not start with PNG signature. - apktool

file converter.txt

Have you ever gone through this error while building apk using apktool?

W: /home/nnnn/Desktop/Android/com.package/res/drawable-hdpi/arrow_t_l.png: error: failed to read PNG signature: file does not start with PNG signature.
W: /home/nnnn/Desktop/Android/com.package/res/drawable-hdpi/arrow_t_l.png: error: file failed to compile.
W: /home/nnnn/Desktop/Android/com.package/res/drawable-hdpi/arrow_t_r.png: error: failed to read PNG signature: file does not start with PNG signature.
W: /home/nnnn/Desktop/Android/com.package/res/drawable-hdpi/arrow_t_r.png: error: file failed to compile.
brut.androlib.exceptions.AndrolibException: brut.common.BrutException: could not exec (exit code = 1): 

Here's the solution:

when I use tried to check if the files are valid png's using this command 

"find file_name.png"

I got IFF (little-endian) data, Web/P image

So to convert the webp files to png

we have to install webp

sudo apt install webp

Then execute the below command to convert the files to png with same naming

find . -name '*.png' -exec sh -c 'if file "$0" | grep -q "Web/P image"; then dwebp "$0" -o "${0%.png}.png" && mv "${0%.png}.png" "$0"; fi' {} \;

Now rerun the apktool build command and see if it works :)