7z to ZIP, opened right in your browser.

To convert 7z to ZIP, drop the .7z file here. The page reads the archive on your computer, lists every file with its size, and saves the files again as one ZIP that a Mac, a Windows PC or a phone opens without extra software. No upload happens, so a private archive is never sent to a server, and no service sets a size cap or a daily limit. The limit is your browser's memory, and this page states it below.

How to convert 7z to ZIP

1. Drop the .7z file on the box, or click it to choose the file.
2. Read the list that appears first. Each row has the file name, its folder and its size, and the line above the list adds up the total.
3. Wait for the status line to finish unpacking. The ZIP is made at once, and the Save buttons on the rows wake up.
4. Untick any file you do not want, or press Tick none and tick only the ones you need. Press Save at the end of a row to get that one file by itself, with no ZIP.
5. Type a ZIP name, pick a Compression, and press Download the ZIP.

Mac files such as .DS_Store and the __MACOSX folder are left out by default. Untick Leave out Mac and Windows system files to keep them.

Why the ZIP is bigger than the 7z

A 7z archive usually packs all its files as one block, so a repeated pattern in one file helps compress the next. This is called a solid archive. A ZIP packs every file alone, so it cannot use that help. The gap is largest for many similar files. In one example folder of 200 small code files, 522,338 bytes in all, the 7z was 30,604 bytes and the ZIP made from it here was 95,036 bytes. For photos, video and music, which are already compressed, the two sizes are close, and the compression choice None, fastest is the better one.

How big a 7z can be

A solid archive has to be decoded from its start, and the unpacked files are held in your browser's memory while the ZIP is made. This page unpacks archives whose files add up to 1 GB or less. It measures the total from the list before it starts, and if the total is over, it says so and does not unpack. The number came from a real measurement, described in the next paragraph. The 7z file itself must be under 2 GB.

How it was measured: 7z archives of repeated data that unpack to 0.31, 0.73 and 1.26 GB were converted whole in Chrome on a Mac with 16 GB of memory. At 1.57 GB, four of five files could not be read, and at 2.20 GB, six of seven could not. A 7z of 600 MB of random data, which cannot be packed smaller, also worked. The limit is set at 1 GB to leave room for computers with less free memory than that Mac. Other computers and browsers may do better or worse.

What is not supported

• Password-protected 7z files. The reader behind this page cannot decrypt 7z, so there is no password box. If the files, or the file names, are locked, the page says so and stops. Open those in an archive app that asks for the password, such as Keka on a Mac or 7-Zip on Windows, then zip the files with the zip file maker.
• Archives split in parts. Names like name.7z.001 and name.7z.002 are one archive in many pieces. This page opens one file at a time and says so when it sees one.
• Other compression methods. LZMA, LZMA2, BZip2, Deflate, stored files and the BCJ filter for programs opened in the example archives made for this page. A 7z packed with Zstandard did not open, and an archive packed with PPMd opened only some of its files. Files that cannot be read are counted and left out of the ZIP, and the page says how many.
• Dates, permissions and empty folders. The ZIP carries the time of the conversion, not the dates stored in the 7z. Empty folders are not kept.

Common problems

Is it safe to open a 7z from someone else

Unpacking only reads the files; nothing inside is run. A program you find inside should be treated the way it would be after any download: do not open it unless you trust where it came from.

Got a RAR instead? Use RAR to ZIP. To look inside a ZIP or take one file out, use unzip files.