RAR → 7z

Learn about the formats: What is 7Z? What is RAR?

Convert your RAR archives to 7Z for superior compression and open-source compatibility. This service is ideal for users seeking smaller file sizes and broader accessibility across platforms.

RAR is a proprietary archive format known for its robust compression and multi-volume support, primarily associated with WinRAR. 7Z, on the other hand, is an open-source format with a typically higher compression ratio, strong AES-256 encryption, and excellent support for very large files, developed by the 7-Zip project. When you convert RAR to 7Z, the contents of the RAR archive are first decompressed, and then re-compressed using the 7Z algorithm, potentially resulting in a smaller output file and a format that's more universally supported across various operating systems without proprietary software licenses.

Converting from RAR to 7Z is a lossless process regarding the actual files stored within the archive. The integrity of your data remains intact, though the compression method changes, which may result in a different final archive size, often smaller with 7Z.

Tips

Consider 7Z's higher compression levels for maximum space saving, especially for large file collections.
Utilize 7Z's robust AES-256 encryption feature if your original RAR archive lacked strong protection or you need enhanced security.
Ensure your original RAR archive is not corrupted before conversion to prevent errors in the 7Z output.
If your RAR is a multi-part archive (e.g., .r00, .r01), combine all parts into a single RAR before converting for best results.

Common use cases

Maximizing Storage Efficiency: Achieve smaller file sizes for long-term storage or when transferring data over limited bandwidth connections.
Open-Source Compatibility: Share archives with users who prefer or only have access to open-source tools like 7-Zip, avoiding proprietary RAR software dependencies.
Enhanced Security: Apply 7Z's strong AES-256 encryption to sensitive data originally stored in less secure RAR formats.
Cross-Platform Archiving: Create archives that are more easily handled on Linux or macOS systems, which often have native 7Z support.

Why ConvertX stays free — forever

We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.

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Free tools today — and always

Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.

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Privacy-first processing

Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.

File formats: what to choose

A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.

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Images

Raster and vector graphics for web, print, and photography.

Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF

Advantages

+ WebP and AVIF offer excellent compression for the web
+ PNG keeps transparency and sharp edges
+ SVG scales without quality loss

Disadvantages

− RAW and TIFF files are large and slow to share
− JPEG loses quality on every re-save
− Some formats are not supported in older browsers

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Documents

Office files, PDFs, ebooks, and plain text.

Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT

Advantages

+ PDF locks layout for printing and sharing
+ DOCX and ODT are easy to edit collaboratively
+ Plain text works on any device

Disadvantages

− PDF is hard to edit without special tools
− Complex layouts may shift after conversion
− Scanned PDFs need OCR for editable text

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Video

Clips, streams, screen recordings, and movies.

Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG

Advantages

+ MP4 (H.264/H.265) plays almost everywhere
+ WebM is efficient for web embedding
+ MKV can hold multiple audio and subtitle tracks

Disadvantages

− High-resolution video needs lots of storage and bandwidth
− Re-encoding always takes time and may reduce quality
− Some codecs require licensing for commercial use

Frequently asked questions

No, the conversion process is lossless. All files contained within your original RAR archive will be preserved without alteration in the new 7Z archive.

Often, yes. 7Z generally uses more advanced compression algorithms (like LZMA2) that can result in smaller file sizes compared to typical RAR compression, depending on the content.

Yes, but you must provide the correct password during the conversion process for the archive contents to be accessible and re-packed into 7Z.

Yes, 7Z supports splitting archives into multiple parts, similar to RAR, which can be configured during the conversion if needed.