JAR to TAR Converter

Convert JAR to TAR 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

or drag and drop files here

Maximum file size is 1GB

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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.

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.

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.

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 JAR file?

The JAR (Java Archive) file format is a platform-independent package file format based on the ZIP standard, originally developed by Sun Microsystems (now Oracle Corporation) to aggregate multiple Java class files, associated metadata, and resources into a single distribution unit. It utilizes the DEFLATE compression algorithm to reduce file size and necessitates a manifest file, typically located at META-INF/MANIFEST.MF, which specifies the application entry point (Main-Class attribute) and classpath dependencies. The format is integral to the Java Platform, allowing the Java Runtime Environment (JRE) to deploy applications and libraries efficiently by reducing HTTP requests during network transfer.

How to open a JAR file

To execute a JAR file as a standalone application, the host system requires the installation of a Java Runtime Environment (JRE) or Java Development Kit (JDK); users typically run the file via the command line interface using java -jar or through configured OS file associations. For static inspection or extraction of the archive's contents without execution, users can utilize standard file compression utilities such as 7-Zip, WinRAR, or the unzip command on Unix-based systems, as the JAR format complies with standard ZIP file specifications.

JAR Technical Info

Full Name: Java Archive
Developed By: Sun Microsystems (Oracle Corporation)
Initial Release: 1997
MIME Type: application/java-archive

What is a TAR file?

The TAR (Tape Archive) format is a file format standardized by POSIX.1-1988 and later POSIX.1-2001 (pax), originally developed for writing data to sequential I/O devices like magnetic tape drives. Unlike modern archive formats, TAR is purely a container format that concatenates multiple files into a single archive without native compression, preserving file system attributes such as user/group permissions, dates, and directory structures. It is frequently paired with compression utilities like Gzip or Bzip2 in Unix-like environments.

How to open a TAR file

Most Unix-based systems (Linux, macOS, BSD) include native support via the GNU Tar command-line utility. Windows does not natively support TAR extraction in versions prior to Windows 10 (Build 17063), requiring third-party tools. For cross-platform compatibility, 7-Zip and WinRAR are standard utilities for inspecting and extracting TAR containers.

TAR Technical Info

Full Name: Tape Archive
Developed By: AT&T Bell Laboratories
Initial Release: 1979
MIME Type: application/x-tar

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Why RunConvert

The fastest way to convert any file

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

Convert JAR to TAR in seconds

Every JAR to TAR 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 JAR to TAR via API

Automate JAR to TAR 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": "jar-to-tar",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "tar"
      },
      "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.jar

# 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.