JAR to 7Z Converter

Repackage JAR as 7Z for maximum compression — free

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Maximum Compression

Switching from JAR to 7Z can significantly reduce archive size. LZMA2 compression outperforms the ZIP-based Deflate algorithm that JAR relies on — your files get smaller.

AES-256 Encryption

7Z supports robust AES-256 encryption, offering much stronger security than JAR. Your uploaded files are also deleted right after conversion for additional privacy.

No Software Required

Everything happens in your browser at convertio.co. No 7-Zip installation needed on your end — just upload the JAR and download the 7Z result.

How to convert JAR to 7Z

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

Choose 7z or any other format you need as a result (more than 200 formats supported)

Let the file convert and you can download your 7z file right afterwards

About formats

JAR (Java Archive) is a package file format based on ZIP, developed by Sun Microsystems) and introduced with JDK 1.1 in January 1996 for distributing Java class files, associated metadata, and resources as a single deployable unit. A JAR file is structurally a ZIP archive with an added META-INF/MANIFEST.MF file — a text manifest that declares the archive's main class entry point, classpath dependencies, package versioning, and digital signature information. The Java runtime loads classes directly from JAR files without extraction, using the ZIP directory for efficient random access to individual entries. JAR archives can be made executable: specifying a Main-Class attribute in the manifest allows launching the application with a simple java -jar command. The format supports code signing through the JDK's jarsigner tool, embedding digital signatures that verify the authenticity and integrity of the archive's contents. One advantage is the Java ecosystem's native integration — the JVM, build tools (Maven, Gradle), application servers, and IDEs all treat JAR files as first-class artifacts, enabling a unified build-deploy-run pipeline. The format's backward compatibility with standard ZIP) tools is another practical strength: any ZIP utility can inspect JAR contents, while the manifest and signing layers add Java-specific capabilities on top. JAR remains the fundamental distribution unit for Java libraries and applications across enterprise, mobile, and embedded deployments.

Developer: Sun Microsystems

Initial release: January 23, 1996

7Z is the native archive format of 7-Zip, an open-source file archiver created by Igor Pavlov in 1999. The format uses an open, modular architecture that supports multiple compression algorithms — LZMA and LZMA2 (the defaults), PPMd for text-heavy data, BWT, and Deflate — selectable per file within the same archive. LZMA typically achieves 30-70% better compression ratios than Deflate-based ZIP files on comparable data, making 7Z one of the most space-efficient general-purpose archive formats available. The container structure stores files with full directory hierarchy, timestamps, and attributes, while supporting solid compression (treating multiple files as a continuous data stream) for additional ratio gains on archives with many similar files. Encryption uses AES-256 with key derivation based on iterative SHA-256 hashing, and both file contents and filenames can be encrypted. One advantage is superior compression density — 7Z consistently produces smaller archives than ZIP or RAR on most data types, valuable when minimizing storage or bandwidth matters. The open architecture is another strength: the format specification and 7-Zip source code are publicly available under the GNU LGPL, enabling any developer to implement 7Z support without licensing constraints. Cross-platform tools supporting 7Z exist for Windows, macOS, Linux, and mobile platforms, and the format has gained widespread recognition as the preferred choice when maximum compression is the priority.

Developer: Igor Pavlov

Initial release: 1999

Frequently Asked Questions

Why convert JAR to 7Z?

7Z uses LZMA2 compression, delivering the best ratio among mainstream archive formats. It also supports AES-256 encryption — far stronger than JAR's ZIP-based structure offers.

What software opens 7Z files?

7-Zip is the primary tool — free and open source. PeaZip, Keka on macOS, and various Linux archive managers also handle 7Z extraction natively.

Does converting shrink the archive further?

Likely yes. 7Z's LZMA2 algorithm typically achieves a better compression ratio than the Deflate method used inside JAR files, so the resulting file may be noticeably smaller.

Will the original JAR contents stay intact?

Completely. All class files, manifests, resources, and directories within the JAR transfer to the 7Z container without modification.

Is the converter truly free?

Yes — JAR to 7Z conversion costs nothing on convertio.co. Premium plans exist for users who need larger allowances or priority in the processing queue.

Can I access this from a tablet?

Of course. The converter runs in your browser, so iPads, Android tablets, and any other device with web access work perfectly.

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Specific converters

ZIP to 7Z

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ACE to 7Z

TAR.LZ to 7Z

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ARC to 7Z

TGZ to 7Z

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LHA to 7Z

DEB to 7Z

ARJ to 7Z

ALZ to 7Z

CAB to 7Z

RPM to 7Z

TAR.Z to 7Z

TAR.7Z to 7Z

CPIO to 7Z

TAR.BZ to 7Z

TAR.LZMA to 7Z

TAR.LZO to 7Z

TAR.XZ to 7Z

TBZ2 to 7Z

JAR to 7Z Quality Rating

4.4 (45 votes)

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