# 7Z Viewer

Free online 7Z viewer. Open .7z archives in your browser to list and inspect contents — no upload, no extraction.

> Canonical page: https://elysiatools.com/en/viewers/7z

- **Category:** Archives

- **Supported formats:** .7z

## Overview

This 7Z viewer reads archive contents directly in your browser. 7Z is the open, high-ratio archive format from 7-Zip, known for its excellent compression using LZMA/LZMA2. Pick a sample or choose your own .7z file to browse its file tree instantly, with no upload and no extraction software.

## When to use

- You received a .7z archive and want to check its contents without installing 7-Zip.
- You need a private preview before extracting a large compressed download.
- You want to inspect a 7Z archive on a machine without the right software.

## How it works

- Select a built-in sample archive or choose your own .7z file.
- The viewer reads the archive's file table in your browser — nothing is uploaded.
- Browse the file list and inspect entry names and sizes.

## Use cases

- Checking large software downloads distributed as 7Z.
- Verifying backup archives before restoring.
- Inspecting LZMA-compressed archives without 7-Zip installed.

## Samples

- **Sample Archive**: A small 7Z archive with text and JSON files for in-browser preview

## Frequently asked questions

### Why are 7Z files smaller than ZIP?

7Z uses the LZMA/LZMA2 algorithms, which typically achieve a higher compression ratio than ZIP's Deflate. The trade-off is that compressing takes more time and memory.

### Are my 7Z files uploaded?

No. The archive stays on your device and is read locally in the browser. Only the public sample archive is requested from the server.

### Can it open encrypted 7Z archives?

Password-protected 7Z files cannot be listed without the password. The viewer handles standard unencrypted 7Z archives.

## Related content

- [ZIP Viewer](https://elysiatools.com/en/viewers/zip): Open and preview ZIP archives (.zip, .zipx) directly in your browser — list contents without uploading or extracting.
- [RAR Viewer](https://elysiatools.com/en/viewers/rar): Open and preview RAR archives (.rar, .cbr) directly in your browser — list contents without uploading or extracting.
- [TAR Viewer](https://elysiatools.com/en/viewers/tar): Open and preview TAR archives (.tar, .tgz) directly in your browser — list contents without uploading or extracting.
- [GZ Viewer](https://elysiatools.com/en/viewers/gz): Open and preview GZip archives (.gz, .gzip) directly in your browser — list contents without uploading or extracting.
- [BZ2 Viewer](https://elysiatools.com/en/viewers/bz2): Open and preview BZip2 archives (.bz2, .bzip2, .tbz, .tbz2) directly in your browser — list contents without uploading or extracting.
- [XZ Viewer](https://elysiatools.com/en/viewers/xz): Open and preview XZ archives (.xz, .txz) directly in your browser — list contents without uploading or extracting.