RAR to 7Z Converter

Convert RAR to 7Z online — open format, free converter

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Open-Source Format

Unlike the proprietary RAR format, 7Z is fully open-source. Converting your RAR archives to 7Z removes licensing concerns while maintaining excellent compression.

Quick Cloud Processing

Conversion from RAR to 7Z is handled on high-performance servers. Even substantial archives are processed swiftly without taxing your own hardware.

Stronger Encryption

Moving from RAR to 7Z upgrades your encryption from AES-128 to AES-256. Your uploaded archives are also deleted immediately after conversion for full privacy.

How to convert RAR to 7Z

1

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

2

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

3

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

About formats

RAR (Roshal Archive) is a proprietary compressed archive format created by Russian software engineer Eugene Roshal in March 1993, distributed through the WinRAR archiver that became one of the most widely installed Windows applications worldwide. The format uses a sophisticated compression algorithm that has evolved through several major versions (RAR 1.3, 2.0, 3.0, 5.0), with each revision improving compression ratios and adding features. RAR5, the current version, employs a dictionary-based algorithm with dictionary sizes up to 1 GB and supports optional BLAKE2sp hashing for integrity verification. The format provides solid compression (treating multiple files as a continuous stream), multi-volume archive splitting, recovery records for repairing damaged archives, AES-256 encryption for both content and filenames, and Unicode filename support. One advantage is reliable error recovery — RAR's recovery record feature can reconstruct damaged archive portions, a capability that made it popular for distributing large files across unreliable connections and Usenet posts. Strong compression performance is another key strength: RAR consistently ranks among the top formats for general-purpose compression ratios, particularly on heterogeneous file collections. While the compression algorithm is proprietary and creating RAR archives requires licensed software, the decompression code is freely available, and extraction is supported by virtually every archiving tool across all platforms. RAR remains one of the most common archive formats encountered online.
Developer: Eugene Roshal
Initial release: March 1993
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 RAR to 7Z?

7Z is open-source and offers LZMA2 compression comparable to RAR — often even better. It also provides AES-256 encryption, stronger than what RAR offers, without proprietary licensing.

What programs open 7Z archives?

7-Zip is the primary tool and it is free. PeaZip works cross-platform, and Keka is a popular option on macOS. All handle 7Z archives natively.

Is there a charge for RAR to 7Z conversion?

None whatsoever. Convertio.tools provides this conversion free of charge — no subscription, no account creation needed.

Does the conversion work on Linux?

Yes. The converter is entirely browser-based, so it works on Linux, Windows, macOS, ChromeOS, and mobile platforms without installing anything.

Can I batch convert RAR archives to 7Z?

You can. Upload multiple RAR archives at once and convert them all to 7Z in a single batch — no need to repeat the process for each archive.

Will my archive contents remain intact?

Yes — all directories, files, and nested folder structures from your RAR archive are preserved completely in the 7Z output.

RAR to 7Z Quality Rating

4.7 (951 votes)
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