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BZ2 to 7Z Converter

Convert BZ2 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 BZ2 file?

The BZ2 file format is a compressed single-file stream generated using the bzip2 algorithm, developed by Julian Seward in 1996. It achieves high compression ratios by stacking the Burrows-Wheeler Transform (BWT) for reversible block sorting, the Move-to-Front (MTF) transform, and Huffman coding for final entropy encoding. Unlike container formats such as ZIP, BZ2 performs pure compression without file aggregation; consequently, it is frequently paired with TAR (Tape Archive) in UNIX environments to create .tar.bz2 archives. The file structure utilizes a 900k block size by default and is identified by the ASCII magic bytes 'BZh'.

How to open a BZ2 file

Most UNIX and Linux distributions provide native kernel-level or shell support for BZ2 extraction via the command-line bzip2 utility or the GNU Tar suite. macOS users can decompress these files using the built-in Archive Utility. Windows operating systems lack native support for the Burrows-Wheeler algorithm and require third-party file management software, specifically 7-Zip, WinRAR, or PeaZip, to decode the stream and extract the underlying content.

BZ2 Technical Info

Full Name
Bzip2 Compressed File
Developed By
Julian Seward
Initial Release
1996
MIME Type
application/x-bzip2

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 BZ2 to 7Z in seconds

Every BZ2 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.

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Developer API

Convert BZ2 to 7Z via API

Automate BZ2 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": "bz2-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.bz2

# 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.