Convert BMP images to PNG format
WhiskFile BMP to PNG is a free online tool to convert BMP images to PNG format. Files are processed entirely in your browser — nothing is uploaded to any server.
Quick Answer
Convert BMP images to PNG format. WhiskFile's BMP to PNG is free, works in your browser, and requires no account. Your files never leave your device — all processing happens locally.
Upload BMP files
Drag & drop or browse to select one or more BMP bitmap images from your device.
Review format info
See bit depth, compression type, color mode, alpha channel, and header version parsed from each BMP header.
Adjust settings
Optionally enable background fill to replace transparency, or resize the output.
Check transparency settings
Review transparent pixel count and toggle background fill if you need a solid color behind transparent areas.
Download PNG
Download individual lossless PNG files or grab all at once in a ZIP archive.
Review file size savings
Compare original BMP and output PNG file sizes — expect 50–80% reduction with zero quality loss.
Max file size: 50 MB (free) · 500 MB (paid). Processing time: ~1s on average. Batch processing: upload multiple files at once.
BMP to PNG runs entirely in your browser — no software to install. Works on any device with a modern browser.
Windows & Mac
Chrome, Firefox, Edge, Safari
iPhone & Android
Safari, Chrome mobile
iPad & Tablets
Full touch support
Unlike server-based tools that upload your documents, WhiskFile processes everything locally in your browser. Your files never leave your device — not even temporarily.
No upload required
Files are processed in your browser — nothing is sent to any server
100% private
No server storage, no data collection, no third-party access
Works offline
Once loaded, works without an internet connection
“Batch-converting RAW exports to web formats saves me hours every week. The quality is excellent.”
Carlos Ruiz
Photographer
“Resizing and converting images for different platforms used to be tedious. Now it's drag and done.”
Priya Sharma
Social Media Manager
Help us improve by sharing your experience with BMP to PNG.
Client-side processing
This tool now runs entirely in your browser — files never leave your device.
Result preview & sharing
Preview your processed file before downloading, and share results via a secure link.
Yes. PNG uses lossless compression — every single pixel is preserved exactly as in the original BMP, with zero quality loss. The conversion is mathematically identical.
Transparency is preserved by default. 32-bit BMPs with alpha channels produce PNG images with full transparency intact. You can optionally enable background fill to replace transparent areas with a solid color.
PNG's lossless compression typically reduces BMP file size by 50–80%. Screenshots with large solid areas compress the most (70–95% smaller), while complex photographs see 30–50% reduction.
WhiskFile reads the BMP binary header to display bit depth (1/4/8/16/24/32-bit), compression type (None, RLE4, RLE8, Bitfields), image dimensions, alpha channel presence, color palette size, and the DIB header version.
Choose PNG when you need lossless quality (zero artifacts), transparency support, or sharp edges (screenshots, text, logos). Choose JPG when you need maximum file size reduction for photographs and don't need transparency.
No. All conversion happens 100% in your browser using client-side JavaScript. Your BMP files never leave your device, ensuring complete privacy.
No. WhiskFile processes everything in your browser, so there are no server-imposed limits on file size or number of files. Performance depends on your device's memory and processing power.
Yes. WhiskFile works in any modern mobile browser — Safari on iOS, Chrome on Android, or any Chromium-based browser. No app installation needed.
Yes. Windows Paint exports 24-bit uncompressed BMPs, which are fully supported. WhiskFile also handles RLE-compressed, 1/4/8/16/32-bit, and all DIB header versions.
Absolutely. PNG is the standard web image format, supported by all browsers and CMS platforms. The converted files are ready for immediate upload.
Yes. PNG files are 50–80% smaller than the original BMPs, making them ideal for email attachments. All email clients support PNG images.
After the page loads, the converter works without an internet connection. All processing uses client-side JavaScript in your browser — no server communication needed.
BMP (Bitmap) stores raw pixel data with minimal compression, resulting in large files. PNG uses lossless compression to produce identical-quality images at 50–80% smaller size, with added transparency support and universal web compatibility.
Yes. BMP to PNG on WhiskFile is completely free with no account required. Free users get 7 tasks per day with files up to 50 MB. There are no watermarks on any plan. Pro plans ($4.99/month) unlock unlimited tasks, 500 MB files, batch processing, and API access.
Yes. BMP to PNG runs entirely in your browser using WebAssembly. Your files are never uploaded to any server — they stay on your device throughout the entire process. No data is transmitted, stored, or accessible to WhiskFile or any third party.
BMP to PNG accepts BMP files as input and produces PNG output. The maximum file size is 50 MB on the free plan (500 MB for Pro users). There are no page count limits.
See how WhiskFile compares to other PDF tools on features, pricing, and privacy.
Chromebook & Linux
Any modern browser
