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ISO to RAR Converter

Convert ISO to RAR 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 ISO file?

An ISO file, technically known as an ISO 9660 file system image, is a sector-by-sector binary replica of data on an optical disc. Governed by the International Organization for Standardization, this uncompressed archive encapsulates the exact digital structure of a CD, DVD, or Blu-ray, including the file system metadata, boot code headers, and attributes required for software distribution and operating system installation. While originally based on the ISO 9660 standard, modern ISO files often utilize the Universal Disk Format (UDF) specification to support larger file sizes and varying optical media types.

How to open an ISO file

Modern operating systems, including Windows 10/11, macOS, and Linux distributions, possess native kernel support to 'mount' ISO images as virtual drives. In Windows, this is achieved via File Explorer, while macOS uses the DiskImageMounter utility to render the file as a readable volume. For older OS versions lacking native mounting capabilities, or to extract the binary contents without mounting, third-party virtualization software such as WinCDEmu or archival tools like 7-Zip and WinRAR are required to parse the container.

ISO Technical Info

Full Name
ISO 9660 Disk Image
Developed By
International Organization for Standardization
Initial Release
1988
MIME Type
application/x-iso9660-image

What is a RAR file?

RAR (Roshal Archive) is a proprietary archive file format developed by Eugene Roshal that supports data compression, error recovery, and file spanning. It utilizes a variation of the LZSS algorithm with a sliding window size of up to 4 MB (in RAR4) or 1 GB (in RAR5), combined with Huffman coding. Key technical features include support for AES-256 encryption, BLAKE2sp hash algorithms for file integrity, and specialized recovery records that allow for the reconstruction of damaged data. The format structure supports solid archiving, where multiple files are treated as a single continuous data stream to improve compression ratios.

How to open a RAR file

Due to the proprietary nature of the RAR licensing, creating RAR files requires licensed software (WinRAR), though extraction is supported by various free tools. Windows users typically use WinRAR or 7-Zip to extract contents. macOS users can utilize The Unarchiver or Keka. On Linux, the non-free unrar package or the open-source 7z (p7zip-full) package provides extraction capabilities via the command line.

RAR Technical Info

Full Name
Roshal Archive
Developed By
Eugene Roshal
Initial Release
1993
MIME Type
application/vnd.rar

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Why RunConvert

The fastest way to convert any file

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

Convert ISO to RAR in seconds

Every ISO to RAR 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

Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert ISO to RAR via API

Automate ISO to RAR 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": "iso-to-rar",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "rar"
      },
      "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.iso

# 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.