CPIO is the classic Unix copy-in/copy-out archive — the container inside Linux initramfs images and RPM payloads.
Typical use: Convert CPIO to ZIP or TAR to inspect initramfs or RPM payloads with everyday tools.
About the CPIO format
CPIO is the Unix “copy in, copy out” archive: a plain concatenation of file headers and contents. You rarely meet it directly — it hides inside Linux initramfs images and RPM packages, which is exactly why you need it when rescuing a broken boot or auditing a package.
Converting CPIO to ZIP or TAR puts the extracted tree into a container every OS opens.
Strengths
- ✓ The container inside initramfs/RPM
- ✓ Dead-simple streaming format
- ✓ Preserves permissions
Limitations
- ✗ No compression of its own
- ✗ Obscure outside Unix plumbing
- Layout
- Header + data per file
- Compression
- None (often gzipped outside)
- Bundling
- Full directory trees
- Best for
- Boot images and RPM payloads
Convert CPIO to…
12 direct directions, sorted A–Z; 🔥 marks popular targets.
Frequently asked questions
What is a CPIO file?
CPIO is the classic Unix copy-in/copy-out archive — the container inside Linux initramfs images and RPM payloads.
How do I convert CPIO files online?
Pick a target format from the "Convert CPIO to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert CPIO files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can CPIO convert to?
This page lists all 12 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.