WBMP to JPG Converter
You found a .wbmp file, probably an old phone logo or an icon from a mobile service, and no program on your computer displays it. WBMP is a very small black and white format built for early mobile devices. This converter decodes it on your device and saves a JPG, PNG or another format you pick.
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Free to use on any site. Paste the code where you want the tool to appear. It runs inside the page; visitors' files are processed in their own browser and are not uploaded.
WordPress and most site builders have a "Custom HTML" block where this code can be pasted. The embed keeps a small link back to CalcMaster.
How to convert WBMP to JPG
- Add your WBMP files by dropping them, clicking the drop zone or pasting.
- The output format is already set to JPG. Adjust quality or size if you need to.
- Press Convert and compare the original and new size for each file.
- Download each file or all of them as a ZIP.
When to convert, and when not to
- You are recovering old mobile graphics such as logos, icons or ringtone-site pictures.
- A web page, document or editor will not accept the .wbmp extension.
- You want a copy that you can enlarge or print.
- Do not expect colour or fine detail: the original holds only black and white dots.
What changes
- Every dot in the file is either on or off, so the result has two tones only.
- JPG smooths edges slightly; choose PNG if you want crisp black and white squares.
- The picture is usually small. Use the Resize option with a percentage to enlarge it, and expect visible square pixels.
- Nothing but the pixel pattern is stored in a WBMP, so no extra information is lost.
- The converter reads the common type of WBMP, which is the plain black and white bitmap.
What WBMP was made for
WBMP stands for wireless bitmap. It belongs to the early days of mobile phones, when screens were small, monochrome and connections were slow. The format keeps things as small as it can: a few bytes of header giving the type, the width and the height, followed by the dots of the picture packed one bit each.
Because each dot has only two states, a WBMP can show a logo or a simple icon but not a photograph. If you are expecting a detailed picture inside a .wbmp file and see only blocks, the file is working as designed.
Making a small bitmap useful today
Modern screens are much sharper than the phones these files came from, so a WBMP viewed at its real size looks tiny. The Resize option can enlarge it by a percentage. Enlarging copies each dot into a bigger square instead of inventing detail, so edges stay blocky, which is the honest look of this format.
For printing or for a website, converting to PNG keeps the black and white exactly. A JPG works too, but its compression can add faint grey noise around the squares, which you may notice when the image is enlarged.
Files this tool can and cannot read
The tool reads the standard form of WBMP, with a one-bit picture, and handles widths and heights stored in the compact multi-byte way the format uses for large values. If a file declares a different type or ends before all of the dots are present, you will see an error message.
Because the conversion happens in the browser tab, the file never leaves your computer. You can convert several at once and download the results together as a ZIP.
Old mobile galleries often contain dozens of these files, each only a few lines of dots. Add them all together, convert them in one run and download the set as a ZIP, so you do not need to save each tiny picture by hand.
Privacy: your files stay on your device
- The tool decodes, resizes and encodes your pictures with your browser. The files are never sent to a server.
- To check it yourself: open the browser developer tools (F12), open the Network tab, convert a file, and look for any request that carries your image. You will see none.
Frequently asked questions
What is a WBMP file?
A black and white bitmap format created for early mobile phones. Each dot of the picture is either on or off.
Why is my converted image so small?
WBMP pictures were made for tiny screens. Use the Resize option to enlarge the result by a percentage.
Will it be in colour?
No. The original holds only two tones, so the result is black and white.
Should I choose JPG or PNG?
PNG keeps sharp edges exactly. JPG works for sharing but can add faint noise around the squares.
Why does the converter report an error?
The file may use a type of WBMP other than the common black and white one, or it may be cut short.