OpenAnyFile
Works
Viewing, inspecting and verifying. You get a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis. File details, exact byte size and the detected signature are always shown.
How to open a .tmp file
A TMP file is a Temporary File, introduced by — in 1980. Below: what is actually inside one, and how to open it without installing special software.
What is a .tmp file?
Temporary File is a binary & system format, first appearing in 1980. It is normally produced by Any application.
Intended to be deleted automatically. When an app crashes mid-save, the .tmp left behind often holds a complete recoverable copy of your work.
| Full name | Temporary File |
|---|---|
| File category | Binary & system |
| MIME type | application/octet-stream |
| Introduced | 1980 |
| Usually created by | Any application |
| OpenAnyFile engine | universal hex inspector |
| Opens without upload | Yes — parsed locally in your browser |
Open a .tmp file in your browser
OpenAnyFile routes .tmp to its universal hex inspector, which inspects a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .tmp 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 universal hex inspector.
- Your TMP opens on its own viewer page: a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis.
- Use fullscreen for a closer look, or download the file back out unchanged. Nothing is transmitted anywhere — the parsing happens in your own browser process.
What you can and cannot do with it here
Does not work
Full-fidelity rendering. This extension has no standard structure, so you get a byte-level inspection rather than a rendered view.
Local-only by design, not by promise
Plenty of sites promise they delete your uploads. OpenAnyFile avoids the promise by avoiding the upload. When you drop a .tmp file in, the browser grants the page temporary read access to those bytes and nothing more — the page has no path to send them anywhere. You can verify it in seconds: open DevTools, switch to the network tab, and open a file. The request list stays empty.
Frequently asked questions about TMP files
Can I open a .tmp file without installing special software?
Yes. OpenAnyFile's universal hex inspector runs in your browser, so you can read a TMP file with nothing installed. You get a byte-level hex and ASCII dump alongside the detected signature, exact size and type analysis. It will not replace the original application for editing, but it answers 'what is in this file' in seconds.
How can I tell what a .tmp file actually contains?
The .tmp 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 TMP 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 .tmp file, exactly?
Temporary File — an application/octet-stream format in general use since 1980. Intended to be deleted automatically. When an app crashes mid-save, the .tmp left behind often holds a complete recoverable copy of your work.
Does the same viewer handle formats related to TMP?
Yes — the same engine also opens .dll, .doc, .exe, 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 .tmp file, it will open too: