Step 1 / source
Choose the source
Drop one file here
Choose the 7-zip archive you want to turn into flattened safe downloads.
Checking publication status...LOCAL ARCHIVE CONVERTER / 7Z EXTRACTOR
7Z Extractor
Inspect and extract regular files from a bounded 7Z archive locally with a self-hosted WebAssembly worker and optional authorised password.
Processed in this browserOne .7z archive up to 50 MB. Extraction stops above 200 regular files, 100 MB expanded data, one 100 MB entry, or an unsupported or unsafe archive structure.
7Z - 50 MB - 200 files
No file upload
This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.
Original stays unchanged
The converter creates a separately named output. It never writes back into the source file.
Bounded work
One .7z archive up to 50 MB. Extraction stops above 200 regular files, 100 MB expanded data, one 100 MB entry, or an unsupported or unsafe archive structure.
Plain-language method
How 7Z Extractor works
A self-hosted libarchive WebAssembly worker opens the selected archive, checks encryption, lists entries before extraction, enforces file-count and expanded-size limits, extracts regular files one at a time, and flattens paths into unique safe download names.
- 01Choose a valid source
Choose a standard 7Z archive that you own or are authorised to open. Nested path components are flattened so archive entries cannot write to device folders.
- 02Review the conversion choices
Enter the exact archive password only when needed. Nirmion never guesses passwords and never sends the value to the API or database.
- 03Inspect the separate result
Files appear as separate downloads after a complete safe extraction. Directory structure, links, permissions, timestamps, alternate streams, and special filesystem entries are not recreated.
Useful when
Practical jobs this tool handles
- Open an authorised 7Z without uploading it.
- Inspect a small archive on a managed browser.
- Recover ordinary files while neutralising directory traversal.
Before converting
Check the source and destination rules
- Verify the archive source before opening.
- Confirm filenames and expanded size.
- Scan extracted files before executing or sharing them.
Know the boundary
Know what the destination format cannot keep
Archive extraction does not make content trustworthy. Executables, scripts, documents, and nested archives can still be malicious. Use endpoint protection and never run unknown output.
Quick answers
Questions before you convert
The conversion contract is deliberately explicit.
Can it crack a forgotten password?
No. It accepts only a password you already know and are authorised to use.
Why are folders flattened?
Flattening prevents an archive path from targeting parent or device directories through browser downloads.
Does it extract every 7Z feature?
No. Unsupported codecs, special entries, damaged archives, and files beyond the safe limits are rejected.