Convert BMP to ICO Online
Turn BMP files into ICO output online. The service is free, requires no account, supports batch queues, and limits server uploads to 100 MB per file. The conversion runs on the server in an isolated request. Keep the original file while you review the converted copy.
Convert .BMP to .ICO
Select a file to begin. Processing details and limits are listed below.
How to convert BMP to ICO
- 1
Choose BMP files
Add one or more BMP files to the queue. The uploader keeps batch items separate.
- 2
Set the ICO options
Set the available quality or format options, or keep the defaults for a first pass.
- 3
Convert and download
Run the queue and download the ICO files individually or together as a ZIP.
Bitmap Image vs Icon File
| Spec | Bitmap Image | Icon File |
|---|---|---|
| MIME type | image/bmp | image/x-icon |
| Format type | image | image |
| Contents | Uncompressed raster format by Microsoft. | Multi-resolution icon format for favicons. |
About Bitmap Image
Uncompressed raster format by Microsoft.
About Icon File
Multi-resolution icon format for favicons.
Why convert BMP to ICO?
- Keeping the BMP original gives you a reference while the ICO version is used for delivery.
- Compatibility is often the deciding factor when the same image must open on several devices.
- A separate output avoids overwriting the only copy of the original image.
- A ICO copy is useful when a website, form, printer, or colleague requires a specific image container.
Will quality change?
ICO is a lossless image container, but it is not a time machine: compression artifacts already present in the BMP source remain. The original source remains the best reference for comparison.
Processing and limits
- Processing
- Server-side
- Engine
- Sharp and ImageMagick
- Maximum size
- 100 MB per file on the server.
- Batch support
- Yes, multiple files can be queued; completed results can be downloaded as a ZIP.
- Quality controls
- Options can adjust output dimensions.
The file is processed on the server because the conversion requires a server-side engine or a utility operation.
- BMP features without a direct ICO equivalent may not survive the conversion.
- The output is re-encoded, so keep the original source as the archive copy.
- Browser-first paths depend on local codec support; unsupported cases fall back to the server.
Platform compatibility
The output is a ICO file. Use an application or device that accepts that format, and test the result on the destination platform if compatibility is critical.
When not to convert
- Skip the conversion when the destination already accepts BMP and no compatibility problem exists.
- For a one-off preview, a local viewer may be faster than creating a new delivery file.
- If ICO support is uncertain on the destination device, test a sample before processing a large batch.
Frequently asked questions
- Can I convert BMP to ICO without installing software?
- Upload a BMP file, choose the available ICO options, run the conversion, and download the result. The tool is free, supports batches, and accepts server uploads up to 100 MB.
- Does Convert BMP to ICO require an account?
- It is free, requires no account, and adds no watermark. Server uploads are limited to 100 MB per file, and browser-first paths are limited by device memory.
- Will quality change?
- ICO is a lossless image container, but it is not a time machine: compression artifacts already present in the BMP source remain. The original source remains the best reference for comparison.
- Where is the file processed?
- Yes. This conversion uses a server-side engine, so the file is uploaded over HTTPS, processed in an isolated request, and removed after the result is produced.
- Can I convert several files at once?
- Queue multiple files, run them together, and download the finished results as a ZIP. Each server file is limited to 100 MB, and large batches may take longer.
- What can go wrong?
- Open the downloaded ICO file in the application or database you plan to use, check the structure against the source, and keep the original until the output is approved.