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LZ to 7Z Converter

Convert LZ to 7Z online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

Free to useNo file stored beyond 1 hourEncrypted over TLS 1.2/1.3No watermarks

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

01

Upload your file

Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

02

Choose an output format

Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

03

Convert & download

Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is an LZ file?

The LZ file extension denotes a compressed archive generated by Lzip, a lossless data compressor based on the Lempel-Ziv-Markov chain Algorithm (LZMA). Developed by Antonio Diaz Diaz in 2008 to supersede the raw .lzma format, the LZ format prioritizes data integrity and long-term archival safety over pure speed. It utilizes a stream-based structure consisting of independent 'members,' allowing for the concatenation of files and robust error recovery via tools like lziprecover. Unlike the XZ format, the LZ specification simplifies the header structure while implementing a 4-factor data protection system, utilizing 32-bit Cyclic Redundancy Checks (CRC-32) to verify both header and data stream consistency.

How to open an LZ file

Most modern Windows and macOS configurations lack native kernel-level support for decoding LZ binaries and require third-party compression utilities. On Windows, users should utilize 7-Zip or PeaZip, which integrate the necessary LZMA decompression libraries. macOS users can extract these archives using The Unarchiver or via the command line by installing the lzip package through Homebrew. Linux distributions typically offer native support via the standard lzip command-line utility or through GUI archive managers like File Roller once the lzip package is installed from the repository.

LZ Technical Info

Full Name
Lzip Compressed Archive
Developed By
Antonio Diaz Diaz
Initial Release
2008
MIME Type
application/x-lzip

What is a 7z file?

The 7z format is a compressed archive container created by Igor Pavlov in 1999, characterized by an open architecture and high compression ratios utilizing the LZMA and LZMA2 algorithms. It supports file sizes up to 16 exbibytes (2^64 bytes), Unicode file names, and strong AES-256 encryption, with solid compression capabilities to enhance efficiency for similar file sets. Distributed under the GNU LGPL, the format's modular design accommodates various pre-processing filters and encryption methods, establishing it as a primary standard for high-efficiency data archival.

How to open a 7z file

While Windows 11 builds utilizing the libarchive project offer native support, earlier Windows versions require the official open-source 7-Zip utility or alternatives like WinRAR and PeaZip for extraction. macOS users typically rely on third-party software such as The Unarchiver or Keka, whereas Linux distributions handle 7z archives via the p7zip package accessed through the command line or GUI managers like File Roller.

7z Technical Info

Full Name
7z Archive Format
Developed By
Igor Pavlov
Initial Release
1999
MIME Type
application/x-7z-compressed

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

Convert LZ to 7Z in seconds

Every LZ to 7Z conversion runs on our servers, so your device stays fast and the output quality stays intact.

Fast, cloud-powered

No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

Secure & private

Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

Free - no account needed

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Developer API

Convert LZ to 7Z via API

Automate LZ to 7Z conversions in three steps: create a job, upload your file, then poll for the result.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "lz-to-7z",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "7z"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.lz

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.