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 .pas file
A PAS file is a Pascal Source, introduced by Niklaus Wirth in 1970. Below: what is actually inside one, and how to open it without installing special software.
What is a .pas file?
Pascal Source is a code format developed by Niklaus Wirth, first appearing in 1970. It is normally produced by Delphi, Free Pascal.
Designed for teaching structured programming, then made commercially serious by Turbo Pascal and Delphi.
| Full name | Pascal Source |
|---|---|
| File category | Code |
| MIME type | text/x-pascal |
| Developer | Niklaus Wirth |
| Introduced | 1970 |
| Usually created by | Delphi, Free Pascal |
| OpenAnyFile engine | syntax highlighter |
| Opens without upload | Yes — parsed locally in your browser |
Open a .pas file in your browser
OpenAnyFile routes .pas 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 .pas 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 PAS 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. Nothing is transmitted anywhere — the parsing happens in your own browser process.
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 PAS files
Can I open a .pas file without installing special software?
Yes. OpenAnyFile's syntax highlighter runs in your browser, so you can read a PAS 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 .pas file actually contains?
The .pas 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 PAS 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 .pas file, exactly?
Pascal Source — a text/x-pascal format created by Niklaus Wirth since 1970. Designed for teaching structured programming, then made commercially serious by Turbo Pascal and Delphi.
Does the same viewer handle formats related to PAS?
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 .pas file, it will open too: