UB Converter

Convert U-Boot images and audio files (UB) online for free

Select File
Drop or upload your .UB file

Online File Converter

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How to convert your UB file

Click the "Select File" button above, and choose your UB file.
You'll see a preview.
Click the "Convert file to..." button to save your file in the format you want.

Convert UB to another file type

The converter easily converts your UB U-Boot files to various formats - free and online. No Das U-Boot or or other System software needed.

UB to WEBM
UB to H261
UB to CAF
UB to WTV
UB to FITS
UB to PSP
UB to FLV
UB to F4V
UB to RM
UB to DRC
UB to AU
UB to GSM

Convert a file to UB

To convert other file formats to the "Bootloader Kernel Image" file type, you need software like Das U-Boot or a similar tool.

About UB files

The .UB extension is a unique source of confusion because it serves two completely different technical functions depending on its origin. Most commonly (54%), it is a U-Boot Image used by the Das U-Boot bootloader to initialize embedded devices (like routers and IoT hardware). These files encapsulate a Linux kernel or filesystem with a strict header that allows the hardware to verify the data before booting. The real problem here is that they are binary blobs; you cannot open them in a text editor, and they require command-line tools like mkimage to manipulate.

Alternatively, a .UB file may contain Unsigned Byte audio data (Raw PCM). Unlike a standard WAV or MP3, these files lack a "header" telling the computer how to play them (e.g., sample rate, channel count). If you try to open this in a standard player like VLC, it will likely interpret the unsigned 8-bit data incorrectly, resulting in loud static or silence.

Conversion Strategies:

For Audio: The only way to make these usable is to convert them to a container format like WAV or MP3. You must wrap the raw data with a header specifying it is 8-bit unsigned PCM.
For System Files: Developers often convert .UB images back to raw BIN files to extract the payload, or to Hex dumps for low-level debugging.

Simply drag and drop your file to determine its type and convert it instantly.

Use Convert.Guru to open and convert your UB file.

Users also converted XWB, RAN and XGS files.

FAQ

If you want to convert UB file to CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF, DAT, DB or SQL, you can use Das U-Boot or similar software from the "Embedded System Bootloader Image" category. In the File menu, look for Save As… or Export….

To convert DBF, XML, SQLITE, XLSX, SQL, TSV, ACCDB, YAML, MDB, CSV, ODS or JSON files to UB, try Das U-Boot or another comparable tool in the "Embedded System Bootloader Image" category.

The UB Converter Story

The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our UB converter.