How to open a .001 file online
No extra software to download or install.
Pick your .001 file
Drag it in or click to choose it. We read its contents list first, so it opens right away without unpacking everything.
Browse what's inside
See every file with its size, how much it's compressed and its date, and search by name across all the folders.
Preview or download
Click a file to preview text or images, or save just that one. Need everything? Download it all as a single ZIP.
About .001 files
What a .001 file is, and what's inside it.
A 001 file is the first chunk of a larger file split into numbered parts (.001, .002, .003 ...) for upload, email, or size-limited storage. You cannot open the .001 alone - put every part in one folder and open the .001 with 7-Zip (Windows/Linux) or Keka (macOS). If any part is missing, the original cannot be rebuilt.
Programs that open .001 files
| Full name | Split / multi-volume archive — first part (.001) |
|---|---|
| Developer | N/A (generic numbering convention; used by HJSplit, 7-Zip, WinRAR and many splitters) |
| First released | Sequential .001/.002 numbering popularised by HJSplit (Freebyte) and generic file splitters; 7-Zip uses .7z.001/.zip.001 for its split volumes |
| Category | Archives |
| MIME type | application/octet-stream |
Related viewers
Found something inside the archive? Open it here.
Do I have to unpack the whole .001 file?
No. The viewer reads its table of contents first and only unpacks a file when you click it. That works even with multi-gigabyte archives, because we read just the bytes we need.
Can I open password-protected archives?
Yes, for ZIP (ZipCrypto and AES) and 7Z. You'll be asked for the password,. We can't recover forgotten passwords.
Is my .001 file uploaded anywhere?
No. The code that unpacks the file is downloaded once and then reused.
Why does a .docx or .apk open as an archive?
Because they are ZIP archives under the hood. Office documents, Android apps, Java programs and EPUB books all use ZIP as their container.
What about split archives (.001, .z01, .part1.rar)?
Multi-part archives need all their parts. Today you can open the first part to see the file list; joining parts is on our roadmap.
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