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The pdf2htmlEX project can be obtained in a number of ways....
- As a Debian archive
- As an Alpine tar archive
- As an AppImage
- As a Docker image
- Build from sources
For detail on how to run pdf2htmlEX, have a look at Quick Start (or the Wiki).
Whem page images are stored as WebP in base64 format instead of PNG, the resulting PDF size is significantly reduced. If the images are called externally as WebP instead of embedding them as base64, the size is reduced by approximately 30% more. Below, I’m sharing an example BASH code block that converts PNGs to WebP and embeds the base64-encoded WebP images into all pages.
for img in /path/to/your/directory/bg*.png; do
# Extract the image filename without the extension (.png)
img_name=$(basename "$img" .png)
# Convert the .png image to .webp format with quality 75 and save it in the same directory
convert "$img" -quality 75 "/path/to/your/directory/$img_name.webp"
done
folder_path="/path/to/your/directory"
for file in "$folder_path"/*.page; do
if -f "$file"; then
# Extract the src URL of the image in the .page file and replace the .png extension with .webp
x=$(grep -oP 'src="\K[^"]+'
# Encode the .webp image file to base64 and save it to encode.txt
base64 /path/to/your/directory/$x > /path/to/your/directory/encode.txt
# Remove any newlines from the base64-encoded content and save to a temporary file
cat /path/to/your/directory/encode.txt | tr -d '\n' > /path/to/your/directory/temp_base64.txt
# Update the .page file to use the .webp extension instead of .png
sed -i 's/\(src="[^"]*\)\.png"/\1.webp"/g' "$file"
# Replace the image src in the .page file with the base64-encoded data URI for the .webp image
awk -v x="$x" 'NR==FNR{base64=$0; next} {gsub(x, "data:image/webp;base64," base64)}1' /path/to/your/directory/temp_base64.txt $file > /path/to/your/directory/temp.page && mv /path/to/your/directory/temp.page $file
fi done