Add your XPI file
Drop one or more .xpi files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
XPI to TAR.GZ
Repacking a .xpi archive as .tar.gz moves the same files into a container with different compression and compatibility trade-offs. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop XPI files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting Firefox extension to Gzipped TAR archive
Repacking a .xpi archive as .tar.gz moves the same files into a container with different compression and compatibility trade-offs. An .xpi file is the add-on package for Firefox and Thunderbird. It is a ZIP archive containing a manifest.json that declares the extension's identity and permissions, together with the scripts, stylesheets, and resources the browser loads when the add-on is enabled.
A .tar.gz file is a tarball that has then been run through gzip: tar supplies the multi-file bundling and Unix metadata, gzip supplies the compression. This two-layer pairing is the default distribution format of the open-source world. For this route the practical draw is solid-style compression across the whole file set and full Unix metadata preservation through the tar layer — balanced against no random access to individual members, which is worth knowing before you commit a large batch.
Why convert XPI to TAR.GZ?
The practical trigger for this conversion is usually a mismatch: with .xpi, signature enforcement means a modified archive cannot simply be reinstalled in release Firefox. Switching to .tar.gz buys you solid-style compression across the whole file set, which is why it is the better fit for source releases — nearly every GitHub release tarball. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
XPI vs TAR.GZ at a glance
| Aspect | Firefox extension (.xpi) | Gzipped TAR archive (.tar.gz) |
|---|---|---|
| Format type | Container — quality depends on the codecs and settings inside | Container — quality depends on the codecs and settings inside |
| How it stores data | the container is a standard ZIP; Firefox reads entries directly from it rather than unpacking to disk | compression applies to the tar stream as a whole — effectively solid compression, beating ZIP's per-file approach on collections of small similar files |
| Strongest at | reading an add-on's requested permissions before deciding to install it | source releases — nearly every GitHub release tarball |
| Weak spot | signature enforcement means a modified archive cannot simply be reinstalled in release Firefox | no random access to individual members |
| Metadata | name, version, description, permissions, and the browser-specific settings block live in manifest.json, which extraction preserves. Signature files under META-INF/ describe the original archive and stop being meaningful once its entries are repackaged | ownership, permission modes, and timestamps come from the inner tar layer; the gzip wrapper contributes only its own optional filename and mtime fields |
Pick TAR.GZ as the output
Select .tar.gz in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if TAR.GZ is selectable, the route is real and validated.
Convert on your device
Press Convert. Extraction and repacking use WebAssembly builds of real archive engines (libarchive and fflate) running in your browser.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid TAR.GZ file. Outputs keep the original filename with the .tar.gz extension.
XPI to TAR.GZ questions, answered
Will converting XPI to TAR.GZ lose quality?
Since xpi is container-oriented and tar.gz is container-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .tar.gz itself requires.
Is it private to convert XPI files here?
Yes — the .xpi file is processed inside your browser tab and never uploaded. Extraction and repacking use WebAssembly builds of real archive engines (libarchive and fflate) running in your browser. Close the tab and the file is gone from memory.
Where will the TAR.GZ file work?
One command — tar -xzf — unpacks it on any Linux or macOS box, Windows 10+ includes bsdtar for the same job, and recent Windows 11 builds open tarballs from File Explorer. GUI archivers on all platforms recognize both the .tar.gz and .tgz spellings.
Will the TAR.GZ file be bigger or smaller than my XPI?
It depends on the content: compression applies to the tar stream as a whole — effectively solid compression, beating ZIP's per-file approach on collections of small similar files. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my XPI file?
In .xpi, name, version, description, permissions, and the browser-specific settings block live in manifest.json, which extraction preserves. Signature files under META-INF/ describe the original archive and stop being meaningful once its entries are repackaged. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.