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+---
+title: "Limitations of JSZip"
+layout: default
+section: limitations
+fullpage: true
+---
+
+### Not supported features
+
+All the features of zip files are not supported. Classic zip files will work
+but encrypted zip, multi-volume, etc are not supported and the load() method
+will throw an `Error`.
+
+
+### ZIP64 and 32bit integers
+
+ZIP64 files can be loaded, but only if the zip file is not "too big". ZIP64 uses 64bits integers
+but Javascript represents all numbers as
+[64-bit double precision IEEE 754 floating point numbers](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
+(see section 8.5). So, we have 53bits for integers and
+[bitwise operations treat everything as 32bits](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators).
+So if all the 64bits integers can fit into 32 bits integers, everything will be
+fine. If it's not the case, you will have other problems anyway (see next
+limitation).
+
+### Performance issues
+
+An other limitation comes from the browser (and the machine running the
+browser). A compressed zip file of 10MB is "easily" opened by firefox / chrome
+/ opera / IE10+ but will crash older IE. Also keep in mind that strings in
+javascript are encoded in UTF-16 : a 10MB ascii text file will take 20MB of
+memory.
+
+If you're having performance issues, please consider the following :
+
+* Don't use IE <= 9. Everything is better with typed arrays.
+* Use typed arrays (Uint8Array, ArrayBuffer, etc) if possible :
+  * If you generate a zip file, you should use `type:"uint8array"`
+    (or blob, arraybuffer, nodebuffer).
+  * If you load the file from an ajax call, ask your XHR an ArrayBuffer.
+    Loading a string is asking for troubles.
+* Don't use compression (see below).
+* If you want to get the content of an ASCII file as a string, consider using
+  `asBinary()` instead of `asText()`. The transformation
+  "binary string" -> "unicode string" is a consuming process.
+
+Note about compression :
+When reading a file, JSZip will store the content without decompressing it.
+When generating a compressed file, JSZip will reuse if possible compressed
+content :
+
+* If you read a zip file compressed with DEFLATE and call `generate` with the
+  DEFLATE compression, JSZip won't call the compression algorithms (same with
+  STORE everywhere.)
+* If you read a zip file compressed with DEFLATE and call `generate` with the
+  STORE compression, JSZip will have to decompress everything.
+
+On IE <=9, typed arrays are not supported and the compression algorithm
+will fallback on arrays. In that case, JSZip needs to convert the binary string
+into an array, DEFLATE it and convert the result into a binary string.
+You don't want that to happen.
+
+### The output zip will differ from the input zip
+
+Reading and generating a zip file won't give you back the same file.
+Some data are discarded (file metadata) and other are added (subfolders).
+
+### Encodings support
+
+JSZip only supports utf8 : if the names of the files inside the zip are not in
+utf8 (or ASCII), they won't be interpreted correctly. If the content is a text
+not encoded with utf8 (or ASCII), the `asText()` method won't decode it
+correctly.