OpenAnyFile
Works
Viewing, inspecting and verifying. You get the full text content with encoding detection. File details, exact byte size and the detected signature are always shown.
How to open a .pem file
Opening a PEM file usually means tracking down special software. It does not have to. Here is what the format really is, and a browser-based way to read one right now.
What is a .pem file?
PEM Certificate or Key is a text & markup format developed by IETF, first appearing in 1993. It is normally produced by OpenSSL, web servers, SSH.
Base64 between BEGIN/END lines, so it is safe to paste as text. Whether it holds a certificate or a private key is stated in the header line — never share the latter.
| Full name | PEM Certificate or Key |
|---|---|
| File category | Text & markup |
| MIME type | application/x-pem-file |
| Magic bytes (file signature) | 2D 2D 2D 2D 2D 42 45 47 49 4E |
| Developer | IETF |
| Introduced | 1993 |
| Usually created by | OpenSSL, web servers, SSH |
| OpenAnyFile engine | plain text reader |
| Opens without upload | Yes — parsed locally in your browser |
Open a .pem file in your browser
OpenAnyFile routes .pem to its plain text reader, which displays the full text content with encoding detection.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .pem 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 plain text reader.
- Your PEM opens on its own viewer page: the full text content with encoding detection.
- Use fullscreen for a closer look, or download the file back out unchanged. Works the same on Windows, macOS, Linux, Android and iOS, because it is just a web page.
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.
Your {ext} file stays on your device
The entire pipeline — detection, decoding, rendering — runs client-side. Your browser hands the bytes to a decoder compiled to WebAssembly, the result is drawn to the page, and that is the whole journey. No account is created, no file is stored, and no analytics event carries your filename. This is also why there is no size limit imposed by a server: the only ceiling is your own available memory.
Frequently asked questions about PEM files
Can I open a .pem file without installing special software?
Yes. OpenAnyFile's plain text reader runs in your browser, so you can read a PEM file with nothing installed. You get the full text content with encoding detection. For full editing you still need the original application — this is a viewer, not an editor.
How can I check a file really is a PEM file?
Look at the first bytes rather than the extension. A genuine PEM begins with 2D 2D 2D 2D 2D 42 45 47 49 4E. Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .pem by mistake is easy to spot.
Is it safe to open a PEM 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 .pem file, exactly?
PEM Certificate or Key — an application/x-pem-file format created by IETF since 1993. Base64 between BEGIN/END lines, so it is safe to paste as text. Whether it holds a certificate or a private key is stated in the header line — never share the latter.
Does the same viewer handle formats related to PEM?
Yes — the same engine also opens .dat, .srt, .cer, 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 .pem file, it will open too: