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Asked: 2026-05-27T22:53:59+00:00

I would like to read a pptx file in javascript, so I would like

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I would like to read a pptx file in javascript, so I would like to unzip it and read the content in memory. I don’t want to store the file first on a server. I want to choose a file with a input type file and just use the file of the input-element and read it binary or something like that.

I found a lot of libraries to unzip zip-files from url, I tried to look at the code but I couldn’t figure it out to use it for a blob or byte array.

I can read some stuff like the things described here: http://en.wikipedia.org/wiki/ZIP_%28file_format%29#File_headers

But I don’t know how deflating works on byte- or bit-level.

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  1. Editorial Team

    (You’ve said you want to use an input element, so I’m guessing this is browser-based JavaScript.)

    Your first step will be to use the File API to read the file as a binary string. See my answer to this other question for an example of that. Then you’ll need to find a library. A quick search discovered this one that implements both inflate and deflate. (I don’t have personal experience using it, just found it in an answer to this other question.)

    Naturally this will only work on quite modern browsers that support the File API. Otherwise, you have no option but to push the file to a server and do the work there, since you can’t access the content of the file in the browser without the File API.

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