Open DAT files in your browser
Games, apps and older programs keep their data in .dat files, and Outlook sends some emails as winmail.dat. See what yours holds right here. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your file opens on what it is: the kind of file its bytes say, the apps that open it and the text and files inside it, with every byte in the hex editor.
- What it is • Told by its bytes, from over 1,600 formats
- Pictures, ZIPs and text inside it • Each opens on its own
- Every byte in hex and text • Search, Go to and Inspect
- Type over, insert or delete • Save a copy
About DAT
DAT is what an app calls its own data when it has no better name: game saves and levels, a program's settings and indexes, a Windows profile's NTUSER.DAT, a Video CD's tracks, and text that older software exports.
Filepeek reads the bytes, not the name. A winmail.dat opens as the email it carries and the files attached to it, and a .dat that's a text or a picture opens as one. Any other .dat opens on its About card: the kind of file its first bytes say it is, the apps that open that kind, the text inside it, which often names the app, and its shape from start to end.
Its bytes are a click away in the hex editor, 16 a row with their text beside them. Search for text, hex or a number, read the numbers and dates at any byte in Inspect, and type over, insert or delete. Saving makes a new file, and the one you opened never changes.
Data file
.dat
Format
- MIME type
- application/octet-stream
- Made by
- Apps and games
Inside the file
- Holds
- An app's own data
- Often
- Saves, settings and indexes
- Told by
- Its bytes, not its name
- Made by
- Apps and games
Opens in every browser
Filepeek shows what a .dat file is and every byte of it in Chrome, Edge, Firefox and Safari, however big it is. On their own, browsers only download it.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open DAT
- WindowsThe app that made it • HxD, a free hex editor, for its bytes
- MacThe app that made it • Hex Fiend, a free hex editor, for its bytes
- iPhone and iPadNo app opens it
- AndroidNo app opens it
Questions
How do I open a .dat file?
With the app that made it, so first find out which. Drop it here: its card says what kind of file it looks like, which apps open that kind and the words inside it, which often give the app away.
How do I open winmail.dat?
Drop it here. It opens as the email it carries, with each file attached to it ready to open or save.
Can I edit a .dat file?
Yes. Press Hex editor, then Edit, and type over bytes, insert them or delete them, or change a number in Inspect. Save downloads a new file with your edits.
Can I change a game's .dat save?
You can change any byte, but many games check their saves with a checksum and refuse one that doesn't add up. Keep the original, which Filepeek never changes.
Is it safe to open a .dat here?
Yes. Filepeek only reads its bytes, so nothing in it runs, and the file never leaves your device.