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If you zip several JPEG pictures into a folder, the total size of the folder will be about the same as the original collection of pictures. Sign in with Microsoft. You have multiple accounts.

Windows 10 Windows 8. Locate the file or folder that you want to zip. To unzip extract files or folders from a zipped folder. Locate the zipped folder that you want to unzip extract files or folders from. Do one of the following: To unzip a single file or folder, open the zipped folder, then drag the file or folder from the zipped folder to a new location. Notes: To add files or folders to a zipped folder you created earlier, drag them to the zipped folder. Need more help? Join the discussion.

Was this information helpful? Yes No. Thank you! Any more feedback? The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. Easy to follow. This allows for a ZIP archive to be made into a self-extracting archive application that decompresses its contained data , by prepending the program code to a ZIP archive and marking the file as executable. Storing the catalog at the end also makes possible hiding a zipped file by appending it to an innocuous file, such as a GIF image file.

ZIP format uses a bit CRC algorithm and includes two copies of the directory structure of the archive to provide greater protection against data loss. A ZIP file is correctly identified by the presence of an end of central directory record which is located at the end of the archive structure in order to allow the easy appending of new files.

If the end of central directory record indicates a non-empty archive, the name of each file or directory within the archive should be specified in a central directory entry, along with other metadata about the entry, and an offset into the ZIP file, pointing to the actual entry data.

This allows a file listing of the archive to be performed relatively quickly, as the entire archive does not have to be read to see the list of files. The entries within the ZIP file also include this information, for redundancy, in a local file header. Because ZIP files may be appended to, only files specified in the central directory at the end of the file are valid.

Scanning a ZIP file for local file headers is invalid except in the case of corrupted archives , as the central directory may declare that some files have been deleted and other files have been updated.

File B is then deleted and C updated. This may be achieved by just appending a new file C to the end of the original ZIP file and adding a new central directory that only lists file A and the new file C. When ZIP was first designed, transferring files by floppy disk was common, yet writing to disks was very time-consuming. If you had a large zip file, possibly spanning multiple disks, and only needed to update a few files, rather than reading and re-writing all the files, it would be substantially faster to just read the old central directory, append the new files then append an updated central directory.

The order of the file entries in the central directory need not coincide with the order of file entries in the archive. Each entry stored in a ZIP archive is introduced by a local file header with information about the file such as the comment, file size and file name, followed by optional "extra" data fields, and then the possibly compressed, possibly encrypted file data.

The "Extra" data fields are the key to the extensibility of the ZIP format. Other extensions are possible via the "Extra" field. ZIP tools are required by the specification to ignore Extra fields they do not recognize. The ZIP format uses specific 4-byte "signatures" to denote the various structures in the file. Each file entry is marked by a specific signature. The end of central directory record is indicated with its specific signature, and each entry in the central directory starts with the 4-byte central file header signature.

Conventionally the first thing in a ZIP file is a ZIP entry, which can be identified easily by its local file header signature. However, this is not necessarily the case, as this not required by the ZIP specification - most notably, a self-extracting archive will begin with an executable file header. Tools that correctly read ZIP archives must scan for the end of central directory record signature, and then, as appropriate, the other, indicated, central directory records.

They must not scan for entries from the top of the ZIP file, because as previously mentioned in this section only the central directory specifies where a file chunk starts and that it has not been deleted. Scanning could lead to false positives, as the format does not forbid other data to be between chunks, nor file data streams from containing such signatures.

However, tools that attempt to recover data from damaged ZIP archives will most likely scan the archive for local file header signatures; this is made more difficult by the fact that the compressed size of a file chunk may be stored after the file chunk, making sequential processing difficult. Most of the signatures end with the short integer 0x4b50, which is stored in little-endian ordering.

ZIP specification also supports spreading archives across multiple file-system files. Originally intended for storage of large ZIP files across multiple floppy disks , this feature is now used for sending ZIP archives in parts over email, or over other transports or removable media.

As a result, the built-in timestamp resolution of files in a ZIP archive is only two seconds, though extra fields can be used to store more precise timestamps.

The ZIP format has no notion of time zone , so timestamps are only meaningful if it is known what time zone they were created in. All multi-byte values in the header are stored in little-endian byte order. All length fields count the length in bytes. The extra field contains a variety of optional data such as OS-specific attributes. It is divided into records, each with at minimum a bit signature and a bit length. A ZIP64 local file extra field record, for example, has the signature 0x and a length of 16 bytes or more so that two bit values the uncompressed and compressed sizes may follow.

If the bit at offset 3 0x08 of the general-purpose flags field is set, then the CRC and file sizes are not known when the header is written. If the archive is in Zip64 format, the compressed and uncompressed size fields are 8 bytes long instead of 4 bytes long see section 4. The equivalent fields in the local header or in the Zip64 extended information extra field in the case of archives in Zip64 format are filled with zero, and the CRC and size are appended in a byte structure optionally preceded by a 4-byte signature immediately after the compressed data:.

This ordering allows a ZIP file to be created in one pass, but the central directory is also placed at the end of the file in order to facilitate easy removal of files from multiple-part e.

A "Tokenize" method was reserved for a third party, but support was never added. The DCL Implode is undocumented partially due to its proprietary nature held by IBM, but Mark Adler has nevertheless provided a decompressor called "blast" alongside zlib. ZIP supports a simple password -based symmetric encryption system generally known as ZipCrypto.

It is documented in the ZIP specification, and known to be seriously flawed. In particular, it is vulnerable to known-plaintext attacks , which are in some cases made worse by poor implementations of random-number generators. New features including new compression and encryption e. File name encryption is introduced in. As of version 6. The original. ZIP format had a 4 GB 2 32 bytes limit on various things uncompressed size of a file, compressed size of a file, and total size of the archive , as well as a limit of 65, 2 16 -1 entries in a ZIP archive.

In version 4. In essence, it uses a "normal" central directory entry for a file, followed by an optional "zip64" directory entry, which has the larger fields. However, ZIP64 specifies an extra field that may be added to those records at the discretion of the compressor, whose purpose is to store values that do not fit in the classic LOC or CEN records.

The other entries may stay in the classic record. Therefore, not all entries shown in the following table might be stored in a ZIP64 extra field.

However, if they appear, their order must be as shown in the table. It is also not necessarily the last record in the file. A End of Central Directory Locator follows an additional 20 bytes at the end. Python 's built-in zipfile supports it since 2. This allows arbitrary data to occur in the file both before and after the ZIP archive data, and for the archive to still be read by a ZIP application.

A side-effect of this is that it is possible to author a file that is both a working ZIP archive and another format, provided that the other format tolerates arbitrary data at its end, beginning, or middle. Self-extracting archives SFX , of the form supported by WinZip, take advantage of this, in that they are executable. This property of the. The minimum size of a.

ZIP file is 22 bytes. Such an empty zip file contains only an End of Central Directory Record EOCD : [0x50,0x4B,0x05,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]. Such file contains one or several Deflate-compressed files that are organized and annotated such that a SOZip-aware reader can perform very fast random access seek within a compressed file.

SOZip makes it possible to access large compressed files directly from a. It combines the use of ZLib block flushs issued at regular interval with a hidden index file mapping offsets of the uncompressed file to offsets in the compressed stream. ZIP readers that are not aware of that extension can read a SOZip-enabled file normally and ignore the extended features that support efficient seek capability. ZIP file format includes an extra field facility within file headers, which can be used to store extra data not defined by existing ZIP specifications, and which allow compliant archivers that do not recognize the fields to safely skip them.

The remaining IDs can be used by third-party vendors for proprietary usage. When WinZip 9. In another controversial move, PKWare applied for a patent on 16 July describing a method for combining ZIP and strong encryption to create a secure file.

When using AES encryption under WinZip, the compression method is always set to 99, with the actual compression method stored in an AES extra data field. There are numerous. ZIP tools available, and numerous. ZIP libraries for various programming environments; licenses used include proprietary and free software.