Here is the code on the server side to convert images into base64 such that you can save them into browser JS database for offline retrieval.
#!/usr/bin/perl use MIME::Base64 qw(encode_base64); open (FILE, "z.png"); binmode(FILE); $photobin = ""; while (read(FILE, $buf, 60*57)) { $output = encode_base64($buf); $output=~s/\n//g; $photobin = $photobin.$output; } print $photobin; close(FILE);