TAR → 7z

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

Convert your uncompressed TAR archives to 7Z to achieve superior compression and save disk space. This is ideal for users needing efficient storage or faster data transfer of bundled files.

TAR is primarily an archiving format, bundling multiple files into a single '.tar' file without applying compression. In contrast, 7Z is a robust archive format that excels in compression, utilizing advanced algorithms like LZMA2 to significantly reduce file sizes. When you convert TAR to 7Z, your TAR archive is first unpacked, and its contents are then re-packed and heavily compressed into a new 7Z archive, resulting in a much smaller file.

Since both TAR and 7Z are lossless archive formats, converting from TAR to 7Z does not result in any data loss or quality degradation of the original files within the archive. All original file names, permissions, and directory structures are preserved.

Tips

Always verify the integrity of the generated 7Z archive after conversion, especially for critical data.
If your TAR archive is already compressed (e.g., '.tar.gz'), decompress it first before converting to 7Z for potentially better compression results.
Consider the processing time for very large TAR archives, as 7Z compression can be CPU-intensive.
Ensure your target system has 7-Zip or compatible software installed to extract the new '.7z' file.

Common use cases

Reducing storage footprint: Compressing large collections of log files or backups initially stored as TAR archives to save significant disk space.
Efficient data transfer: Sending extensive project directories or software distributions, previously bundled in TAR, over networks where bandwidth is a concern.
Archiving for long-term storage: Migrating older TAR-based archives to 7Z for better compression and modern archive management.
Consolidating multiple archives: If you have several small TAR archives, converting them to 7Z can help manage them more efficiently while also compressing them.

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

Yes, the conversion process from TAR to 7Z is designed to preserve file metadata, including permissions, ownership, and timestamps, as much as the 7Z format allows.

While the tool can handle many archive types, for '.tar.gz' it typically first decompresses the '.gz' part to get the TAR, then processes it. For optimal results, you might manually decompress '.gz' first if experiencing issues.

Yes, almost always. TAR itself does not compress, it only bundles. 7Z, by design, applies strong compression, so the resulting 7Z file will be significantly smaller than the original TAR archive.

If your TAR file is corrupted, the conversion process will likely fail or result in an incomplete 7Z archive, as the internal structure of the TAR cannot be fully read.