OpenAnyFile
Works
Viewing, inspecting and verifying. You get the source with language-aware colouring and line numbers. File details, exact byte size and the detected signature are always shown.
How to open a .clj file
You have a CLJ file and nothing on your machine will touch it. Here is what the format actually is, and how to read one in about four seconds without installing anything.
What is a .clj file?
Clojure Source File is a code format developed by Rich Hickey, first appearing in 2007. It is normally produced by Leiningen and deps.edn projects.
A Lisp on the JVM in which code is written in the same immutable data structures the program manipulates, so macros transform real lists rather than text.
| Full name | Clojure Source File |
|---|---|
| File category | Code |
| MIME type | text/x-clojure |
| Developer | Rich Hickey |
| Introduced | 2007 |
| Usually created by | Leiningen and deps.edn projects |
| OpenAnyFile engine | syntax highlighter |
| Opens without upload | Yes — parsed locally in your browser |
Open a .clj file in your browser
OpenAnyFile routes .clj to its syntax highlighter, which highlights the source with language-aware colouring and line numbers.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .clj file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the syntax highlighter.
- Your CLJ opens on its own viewer page: the source with language-aware colouring and line numbers.
- Use fullscreen for a closer look, or download the file back out unchanged. Free, and free in the sense that there is no paid tier waiting behind step three.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Is it safe to open a {E} file on a website?
It depends entirely on whether the website uploads it, and almost all of them do. That is a real problem when the code file in question is a contract, a client deliverable or something under NDA. OpenAnyFile removes the question: the decoding happens inside your browser tab, so there is no transfer, no queue, no temporary storage and no retention window to read about in a privacy policy.
Frequently asked questions about CLJ files
Can I open a .clj file without installing special software?
Yes. OpenAnyFile's syntax highlighter runs in your browser, so you can read a CLJ file with nothing installed. You get the source with language-aware colouring and line numbers. For full editing you still need the original application — this is a viewer, not an editor.
How can I tell what a .clj file actually contains?
The .clj extension carries no fixed signature, so the extension alone proves nothing. Opening it in OpenAnyFile shows the raw header bytes and detected type, which is the only reliable way to identify one.
Is it safe to open a CLJ file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .clj file, exactly?
Clojure Source File — a text/x-clojure format created by Rich Hickey since 2007. A Lisp on the JVM in which code is written in the same immutable data structures the program manipulates, so macros transform real lists rather than text.
Does the same viewer handle formats related to CLJ?
Yes — the same engine also opens .html, .xml, .sql, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .clj file, it will open too: