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CPIO to 7Z Converter

Convert CPIO 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 a CPIO file?

The CPIO (Copy In, Copy Out) format is a binary or ASCII archive file format used predominantly in Unix-like operating systems for backing up and transferring files between disparate systems. Originally defined as part of the Programmer's Workbench (PWB/UNIX) and later standardized in POSIX.1 (IEEE Std 1003.1-1988), CPIO archives store file metadata-including inode numbers, user IDs, and timestamps-alongside the raw data stream. Unlike TAR, CPIO handles non-tape media and special files more robustly but requires specific headers (binary, old ASCII, or new ASCII/CRC) to ensure compatibility across System V and BSD-derived kernels.

How to open a CPIO file

Native extraction of CPIO archives is standard on Linux and macOS distributions via the GNU cpio or pax command-line utilities (e.g., cpio -idv < archive.cpio). For Windows environments, which lack kernel-level support for POSIX archiving tools, users must utilize third-party decompression software such as 7-Zip or PeaZip, which implement the necessary decoders to interpret the CPIO header structures and extract the contained file hierarchy.

CPIO Technical Info

Full Name
Copy In, Copy Out
Developed By
AT&T / Bell Labs
Initial Release
1977
MIME Type
application/x-cpio

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

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

Convert CPIO to 7Z in seconds

Every CPIO 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.

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

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Developer API

Convert CPIO to 7Z via API

Automate CPIO 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": "cpio-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.cpio

# 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.