MEF to RB Converter

Switch from MEF to RB format online

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Simple Three Steps

Converting MEF to RB takes just three steps: upload, choose format, download. Anyone can do it in under a minute.

Any Device Works

Convert MEF to RB from any device — Windows, macOS, Linux, or mobile. All you need is a web browser.

Nothing to Install

Convert MEF to RB directly in your browser — no desktop software, plugins, or downloads needed to get started.

How to convert MEF to RB

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose rb or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your rb file right afterwards

About formats

MEF is the proprietary RAW image format used by Mamiya medium-format digital cameras, introduced with the Mamiya ZD in 2004 and continued through subsequent models including the DM series. MEF files capture the unprocessed output from Mamiya's large-area CCD sensors — typically 48x36mm or larger — at 16 bits per channel, preserving the full dynamic range and color depth of the medium-format sensor before any demosaicing, white balance, or tonal processing takes place. The format uses a TIFF-based container that stores the raw Bayer-pattern data alongside embedded JPEG previews and extensive EXIF metadata including Mamiya lens identification, shutter speed, aperture, and metering information. Mamiya (later reorganized as Mamiya Digital Imaging and eventually merged into Phase One's operations) has a legacy stretching back to 1940 in medium-format film photography, and the MEF format represents the digital continuation of that tradition. One advantage is the medium-format sensor's inherent imaging qualities: the larger sensor area captures more light per pixel, producing lower noise floors, smoother tonal gradations, and a shallower depth-of-field rendering that medium-format photographers value for portrait, fashion, and landscape work. RAW flexibility is another practical strength — MEF files processed in Adobe Lightroom, Capture One, or dcraw allow photographers to apply modern demosaicing and noise reduction algorithms to these sensors, often extracting noticeably better results than the camera's original processing offered.
Developer: Mamiya
Initial release: 2004
RB is the native ebook format of the Rocket eBook, one of the first commercially available dedicated e-reading devices, developed by NuvoMedia and released in October 1998. Founded by Martin Eberhard and Marc Tarpenning — who later co-founded Tesla Motors — NuvoMedia designed the Rocket eBook as a handheld device with a reflective LCD screen, capable of storing approximately ten books in its internal memory. The RB format packages HTML-based content along with embedded images, metadata, and a table of contents into a single binary container optimized for the device's limited hardware. Content was purchased and downloaded through NuvoMedia's RocketLibrarian desktop software. A notable advantage of the format was its early support for bookmarking, annotation, dictionary lookups, and adjustable font sizing — features now standard on modern e-readers but revolutionary in the late 1990s. The Rocket eBook demonstrated viable commercial demand for dedicated reading devices, paving the way for subsequent platforms from Sony, Amazon, and others. NuvoMedia was acquired by Gemstar-TV Guide International in 2000, which discontinued the device line in 2003. While RB files are largely a historical curiosity today, they can be converted to modern formats using ebook management tools, and the format remains significant as a pioneering chapter in the evolution of digital reading.
Developer: NuvoMedia
Initial release: 1998

Frequently Asked Questions

Why convert MEF to RB?

Professional studio shots stored as MEF need conversion to RB to reach clients, portfolios, and publishing platforms.

What opens RB files?

RB files can be opened with RocketBook reader devices, Calibre, and legacy e-book applications.

What devices support this MEF to RB converter?

The converter works on any device with a web browser — desktop, laptop, tablet, or smartphone, regardless of OS.

Is MEF to RB conversion free on Convertio?

Standard conversions are available for free. Premium plans unlock higher capacity and priority processing for heavy use.

Does converting MEF to RB lose quality?

Convertio extracts full sensor data from your MEF file. The RB output retains excellent quality within the target format capabilities.

Is my data secure when converting MEF to RB?

Your privacy is protected — uploaded files are deleted right after processing, and results are purged within 24 hours.