Private browser tool

Convert BMP to PNG

Turn a large BMP bitmap into a practical, lossless PNG. Resize and convert it locally in your browser.

PNG Choose a BMP image or drag and drop it here

One BMP image at a time

Output format: PNG

Resize (optional)

WidthHeight

Lock aspect ratio Do not enlarge the image

Output filename

The PNG is newly encoded without the source metadata.

BMP conversion guide

How to convert BMP to PNG

Choose a BMP, optionally adjust its dimensions, then preview and download the lossless PNG result.

Select an image from your device or drag it into the upload area.

Resize the image if you need different output dimensions.

Review the preview and file size, then save the converted image.

This free online BMP to PNG converter includes the following controls and output tools:

Private browser conversion. The image is processed locally and is not uploaded.
Custom dimensions. Set an exact width and height, lock the aspect ratio, and prevent accidental enlargement.
Lossless output encoding. The visible decoded pixels are written without an additional lossy quality setting.
Before-and-after preview. Review the original and converted image, output dimensions, format, and file size.
File-size comparison. See the original and converted sizes and the percentage change.
Custom filename. Rename the converted file before downloading it.
Metadata-free export. The newly encoded PNG does not copy source metadata.

PNG commonly produces much smaller files than uncompressed BMP while retaining the decoded pixels without added loss.

PNG is widely supported on websites and in image editors, documents, presentations, and messaging apps.

PNG uses lossless compression, so there is no quality slider. Reducing dimensions is the main way to further reduce the output.

BMP decoding is provided by the browser. Unusual or damaged BMP variants may not open, and source metadata is not copied.

Is this BMP to PNG converter free?

Yes. Convert one BMP image at a time without an account.

Does conversion lose quality?

The PNG encoding is lossless and does not add compression artifacts.

Why is PNG usually smaller?

PNG compresses repeated pixel patterns, while many BMP files store pixels with little or no compression.

Is my BMP uploaded?

No. Conversion happens inside your browser.

Can I resize the image?

Yes. Set a width or height and optionally keep the aspect ratio locked.

Use the full converter for HEIC, PNG, WebP, JPG, GIF, TIFF, BMP, AVIF, and more.