OpenAnyFile
What is a .erf file?
Epson RAW is a camera RAW format developed by Epson, first released in 2004. It is usually created by Epson R-D1 rangefinder.
Produced by essentially one camera: the Epson R-D1 of 2004, the first digital rangefinder.
File details
| Full name | Epson RAW |
|---|---|
| Category | Camera RAW |
| MIME type | image/x-epson-erf |
| Signature (magic bytes) | 49 49 2A 00 |
| Developer | Epson |
| Introduced | 2004 |
| Opens with | RAW preview extractor |
| Uploaded? | No — read locally in your browser |
How to open a .erf file
OpenAnyFile routes .erf files to its RAW preview extractor, which shows the full-size preview the camera embedded in the file.
- Drop your .erf file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the RAW preview extractor.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: the full-size preview the camera embedded in the file. Size, type, signature and checksums are always shown.
Does not work
Editing layers or the raw data. You see the preview image stored in the file, not an editable document.
Is it safe to open a .erf file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .erf files
Can I open a .erf file without installing software?
Yes. OpenAnyFile opens .erf files in your browser using its RAW preview extractor. You get the full-size preview the camera embedded in the file, with nothing installed and no account.
How do I know a file is really a .erf file?
Check its first bytes instead of its name. A genuine ERF file begins with 49 49 2A 00. OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .erf file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.