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RAR & 7Z Extractor

Open .rar and .7z archives in your browser

About RAR & 7Z Extractor

RAR & 7Z Extractor on UtilityKit opens .rar and .7z archives directly in your browser using a WebAssembly build of libarchive (libarchive.js). There is no install, no desktop archiver, and no upload — the archive is loaded into a worker thread and unpacked locally with the wasm runtime. The tool also handles .zip, .tar, and .tar.gz since libarchive is a multi-format library. Drop in an archive up to 100 MB; the file list appears with paths and uncompressed sizes, and any file can be downloaded with one click. Standard-encrypted archives prompt for the password and decrypt locally so the password never leaves your browser. Solid 7z archives and very large files may run slowly since everything is single-threaded — for those a desktop tool is faster — but ordinary RAR/7z archives extract fine on a Chromebook or any restricted machine without installing anything.

Why use RAR & 7Z Extractor

  • True .rar & .7z Support: Reads native RAR (versions 1.5–5) and 7z archives via libarchive.js's WebAssembly build.
  • Local Decryption: Password-protected archives are decrypted in your browser; the password never reaches a server.
  • Multi-Format: Side benefit — also handles .zip, .tar, .tar.gz, and ISO formats supported by libarchive.
  • No Install: Works on Chromebooks, restricted corporate machines, and any device that can run a modern browser.
  • Selective Extraction: Pull out one file at a time without expanding the entire archive to disk.
  • Free & Unlimited: No signup, no email, no ads, no daily cap.

How to use RAR & 7Z Extractor

  1. Drop a .rar or .7z file onto the dropzone (max 100 MB).
  2. On first use, the WebAssembly extractor downloads from the libarchive.js CDN — subsequent runs are cached.
  3. If the archive is password-protected, the tool prompts for the password and decrypts locally.
  4. Browse the file list — paths and uncompressed sizes are shown for every entry.
  5. Click the down-arrow next to any file to download it as a binary blob.
  6. If extraction fails, the archive may use solid mode, an exotic encryption profile, or simply be too large for browser memory — fall back to 7-Zip on your desktop.

When to use RAR & 7Z Extractor

  • When you receive a .rar or .7z attachment and don't have WinRAR or 7-Zip installed.
  • When inspecting an unfamiliar 7-Zip archive to see what is inside before unpacking on disk.
  • When grabbing a single file out of a multi-file RAR without expanding the rest.
  • When working on a Chromebook, locked-down corporate laptop, or library computer.
  • When auditing a password-protected archive whose password you have, without trusting the password to a third-party online service.
  • When converting between formats — open a .7z, then re-bundle the contents with the ZIP Creator tool.

Examples

Open a .7z without installing 7-Zip

Input: screenshots.7z (45 MB)

Output: File list shown with 32 PNG files — pick the ones you need without installing anything.

Extract one file from a RAR

Input: release.rar (80 MB)

Output: Just install.exe downloaded — the other 200 MB of media stay in the archive.

Tips

  • If a .7z fails to open, try unpacking it once with 7-Zip on your desktop to confirm the archive is not corrupted before retrying here.
  • For multi-volume RAR sets, this browser-only tool is unreliable — use 7-Zip or WinRAR for those cases.
  • Solid 7z archives extract slowly because every single-file extraction touches the whole compressed stream — keep input size modest.
  • Use the ZIP Creator afterward to re-bundle the extracted files into a more universally compatible .zip if you need to share with non-7-Zip users.
  • For sensitive archives, work offline once the page is cached — both decryption and extraction are 100% local.

Frequently Asked Questions

Are my files uploaded?▾
No. libarchive.js runs in your browser as a WebAssembly worker. The archive is read locally, decrypted (if needed) locally, and the extracted files stay on your device.
What is the file size limit?▾
100 MB per archive. The WebAssembly extractor runs single-threaded in your browser, so larger archives may run slowly or exceed memory on low-RAM devices.
Does it support password-protected archives?▾
Yes for standard AES-encrypted .7z and RAR archives. The tool prompts for the password and runs decryption locally — the password never leaves your browser.
Are solid 7z archives supported?▾
Solid 7z archives are technically supported by libarchive but may be slow because the entire archive must be decompressed to extract any single file. For very large solid archives, a desktop tool is faster.
What about RAR5 (the modern RAR format)?▾
Yes. libarchive supports RAR1.5 through RAR5. Multi-volume RAR sets (.r00, .r01, .part1.rar) require all parts in one folder and may not be supported in this browser-only build.
Why is the first extraction slow?▾
On first use, the WebAssembly module (~2 MB) downloads from the libarchive.js CDN. Subsequent loads are cached by your browser, so later sessions are much faster.
Does it support .zip and .tar.gz too?▾
Yes. libarchive is a multi-format library, so .zip, .tar, .tar.gz, .iso, and several other formats also open. For ZIP-only or tar-only work, the dedicated tools are slightly faster.
Is the tool free?▾
Yes — completely free, no signup, no email, no ads, and no daily limit.

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Glossary

RAR
A proprietary archive format created by Eugene Roshal. Known for high compression ratios and built-in error recovery records. Currently in version 5.
7z
An open-source archive format originated by 7-Zip. Uses LZMA / LZMA2 compression and AES-256 encryption, often producing smaller archives than .zip.
Solid archive
A 7z option that compresses all files together as a single stream. Improves compression ratio but means you must decompress the whole archive to extract any single file.
libarchive
An open-source C library that reads and writes many archive formats. The WebAssembly port (libarchive.js) brings this support to the browser.