Batch Convert BMP to PNG Free — No Software, No Upload, No Limits
Table of Contents
If you have dozens of BMP files that need converting to PNG, doing them one at a time in Paint or Preview is tedious. The free browser-based batch converter handles all of them in a single session — drop all your files, click Convert, download a ZIP. No software to install, no files uploaded to any server.
How to Batch Convert BMP to PNG
- Open the converter. Use the link below to open the free BMP to PNG converter.
- Select multiple files. You can drop all your BMP files into the drop zone at once, or click the zone and select multiple files using Ctrl+Click (Windows) or Cmd+Click (Mac) in the file picker.
- Convert all at once. Click "Convert to PNG." The tool processes each file sequentially and shows progress as it goes.
- Download as ZIP. When all files are converted, click "Download All as ZIP" to get a single archive containing all your PNG files.
Each converted file shows its original size, new size, and percentage saved — so you can see exactly how much space you reclaimed.
No File Count Limits
The batch converter has no enforced limit on how many files you can convert in one session. Whether it's 5 files or 500, the tool processes them all. The practical limit is your browser's available memory for very large batches.
For very large batches (hundreds of files), you can do them in groups of 50–100 to keep memory usage manageable. Each group produces its own ZIP file, which you can combine afterward.
There's also no daily limit, no login required, and no watermarks on any output file.
Sell Custom Apparel — We Handle Printing & Free ShippingHow Much Space Will You Save?
BMP files are uncompressed — they store raw pixel data. PNG compresses the same data losslessly, typically achieving:
- Screenshots and flat graphics: 80–95% size reduction
- Photography and complex images: 50–80% size reduction
- Mixed content: 60–85% size reduction
If you're converting a folder of 50 BMP screenshots that each weigh 6MB, you'd start with 300MB of data. After conversion, you'd likely end up with 15–60MB of PNG files — the same content, 80–95% less storage.
Batch Conversion Without Uploading Files
All processing happens in your browser using a modern browser technology image engine. None of your BMP files are transmitted to any server, regardless of how many you convert. Each file is processed locally on your device.
This is particularly relevant for batch jobs involving business documents, design assets, or any content you don't want leaving your network. The converter works offline once loaded — you can even disconnect from the internet after the page loads and still convert files.
Try It Free — No Signup Required
Runs 100% in your browser. No data is collected, stored, or sent anywhere.
Open Free BMP to PNG ConverterFrequently Asked Questions
Can I convert BMP and PNG files in the same batch?
No — the tool specifically converts BMP input to PNG output. All files you drop in should be .bmp files. If you have mixed file types, use the other converters on the site for the non-BMP files.
Does the ZIP preserve original filenames?
Yes. Each PNG in the ZIP has the same base filename as the original BMP with the extension changed to .png. So "photo.bmp" becomes "photo.png" in the ZIP.
What if some files fail to convert?
Files that fail to convert (corrupt BMP, unsupported variant) are shown with an error message in the list. The rest continue converting normally. You can still download the ZIP containing all successfully converted files.
James worked as an in-house graphic designer for six years before moving to content writing. He covers image editing and design tools with a focus on what actually works for non-designers.
More articles by James →