ERF to JPG Converter
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Supports: ERF
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Need help?ERF to JPG Converter
ERF is the Epson RAW format written by the Epson R-D1 family of digital rangefinder cameras — a niche, long-discontinued format that almost no everyday viewer, phone, or web browser can open. Converting an ERF to JPG renders that raw sensor data into a standard 8-bit image that opens anywhere, at the cost of the RAW file's editing latitude. This tool reads the ERF, demosaics it, and writes a JPEG with controls for quality, resolution, and target file size.
ERF Format at a Glance
| Property | Value |
|---|---|
| Full name | Epson RAW File |
| Container | TIFF/EP (Compression value 32769 — bit-packed CFA) |
| Cameras | Epson R-D1 (2004), R-D1s (2006), R-D1x / R-D1xG (2009, Japan-only) |
| Sensor | 6.1 MP APS-C interline CCD (Sony ICX413AQ, 23.7 × 15.6 mm) |
| Max resolution | 3008 × 2000 px |
| Sample depth | Raw mosaic, typically 12-bit per photosite (un-demosaiced) |
| Data layout | CFA in primary subIFD of IFD0; 8-bit RGB thumbnail + Exif in IFD0 |
| Status | Discontinued; R-D1x line ended 17 March 2014 |
| Best for | Master capture you intend to develop/edit later |
JPG Format at a Glance
| Property | Value |
|---|---|
| Standard | JPEG — ISO/IEC 10918-1 / ITU-T T.81, published 1992 |
| Compression | Lossy, DCT on 8 × 8 blocks (lossless mode exists but is rarely used) |
| Sample depth | 8-bit per component (24-bit color / 8-bit grayscale) |
| Color | Already demosaiced to RGB; no raw editing latitude retained |
| Metadata | Exif and ICC profile supported; thumbnail embeddable |
| Native support | Opens in every browser, OS image viewer, and phone gallery |
| Best for | Sharing, web, printing, archiving a finished image |
How to Convert ERF to JPG
- Upload Your ERF File: Drag and drop your
.erffile onto the page or click "+ Add Files". You can queue several ERF files and convert them with the same settings in one pass. - Set the Quality Preset: The default is Very High (Recommended) under Image Compression — higher presets preserve more sensor detail at a larger file size. For a tighter file, switch to Specific file size and enter a target in MB.
- Adjust Image Resolution (Optional): Keep the original 3008 × 2000, scale by Resolution Percentage, choose a Preset Resolution, or set an exact Width or Height with aspect ratio locked.
- Convert and Download: Click "Convert" and download the JPG. No sign-up, no watermark — the output opens in any browser, gallery, or editor.
Frequently Asked Questions
What is an ERF file and why won't it open on my computer?
ERF is the raw image format produced by Epson's R-D1, R-D1s, and R-D1x rangefinder cameras. It is a TIFF/EP file holding un-demosaiced sensor data, so a regular image viewer that expects a finished RGB picture can't display it. Because the R-D1 line was discontinued in 2014 and was always niche, most modern software has dropped or never had a decoder. Converting to JPG produces a standard image that any browser, phone, or viewer opens.
Will I lose quality converting ERF to JPG?
Some, and it's worth understanding what. A JPG is 8-bit per channel and already demosaiced, so you give up the RAW's higher bit depth and the latitude to recover highlights, fix white balance, or push shadows without artifacts. JPEG's DCT compression also discards fine detail at lower quality settings. If you only need a viewable, shareable image, the loss is invisible at high quality. If you may want to edit later, keep the original ERF as your master and treat the JPG as a derivative.
Should I edit the ERF in a RAW developer first, or just convert?
If you have the original ERF and want maximum quality, develop it in a RAW editor (darktable, RawTherapee, or anything built on dcraw all read ERF) and export to JPG from there, so white balance and tone are set on the 12-bit data. A direct ERF-to-JPG conversion applies a sensible default rendering and is ideal when you simply need to open or share the shot without a full editing pass.
What resolution will the JPG be?
By default it matches the camera's native 3008 × 2000 pixels (about 6 megapixels). You can downscale with Resolution Percentage or a Preset Resolution for web or email, or set an exact width/height. Upscaling beyond 3008 × 2000 won't add real detail, since that is the sensor's full output.
Does the converted JPG keep the Exif shooting data?
JPG fully supports Exif, and the ERF carries Exif in the ExifIFD of its IFD0. Camera, exposure, and date fields are preserved in the output where present. Lens data is often sparse on R-D1 files because Leica M-mount lenses are fully manual and don't report focal length or aperture electronically, so those fields may simply be empty in the source.
How big will the output file be?
A 6 MP JPG at a high quality preset is usually a few megabytes — far smaller than the raw ERF, which stores the full sensor readout. In our testing, a 3008 × 2000 ERF exported at the Very High preset produced a JPG in the low single-digit megabytes; dropping to Specific file size lets you cap it for email or upload limits.
Can I convert ERF to a different format instead of JPG?
Yes. If you want lossless output or transparency, convert ERF to PNG instead — PNG keeps every pixel exactly but produces a much larger file. For a 16-bit editable intermediate, develop the ERF in a RAW tool and export TIFF. JPG remains the best pick for a small, universally compatible image.
Are my uploaded ERF files kept private?
Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. The JPG you download is yours to use anywhere.