PNG to BMP Converter — Free Online
Convert PNG to BMP online for free. No signup required. Client-side — your files never leave your device.
About PNG to BMP Conversion
Converting PNG to BMP sits at the intersection of two of the most-searched questions in image workflows: file compatibility and file size. PNG files behave well in their native environment but cause friction when you need to share, edit, or publish them somewhere that expects BMP. The most common triggers for this conversion are uploading to a platform that rejects PNG, opening the file in software that does not recognize it, attaching the image to a document workflow, and reducing the file size for faster web delivery. None of those problems require a server upload — the file format is fully described, the math is well-known, and a modern browser has every API needed to do the conversion locally. PNG is a compressed, lossless image format that keeps files small while preserving every pixel, whereas BMP is a plain, uncompressed bitmap that stores each pixel raw. Converting PNG to BMP is something you do for older Windows software or hardware that expects an unadorned bitmap rather than a compressed file. FileChange decodes your PNG and writes the raw BMP entirely in your browser, so the image never leaves your device.
Why People Convert PNG to BMP
There is no single reason to convert PNG to BMP; there are four overlapping ones. Compatibility is the most common: the destination application, website, or printer simply does not accept PNG. File size is the second: BMP either compresses better (saving bandwidth) or worse (preserving fidelity) than PNG, and the right choice depends on what you do next with the image. Editing is the third: some editors strip metadata or refuse to open certain PNG variants, while BMP loads cleanly. And finally there is preservation — converting between lossless formats avoids generation loss when you plan to keep editing the file. FileChange handles all four motivations in the same one-click flow. Certain legacy Windows applications, embedded tools, and older imaging pipelines were built to read BMP and nothing fancier, since a BMP is just a straightforward grid of pixel values with no decompression step. Converting your PNG to BMP hands those tools the simple, predictable format they were designed around.
How to Convert PNG to BMP Online
- Open FileChange. Open this PNG to BMP converter in any modern browser — Chrome, Firefox, Safari, or Edge all work. No installation, no plugin, no account.
- Drop your PNG file. Drag your PNG file into the upload area, or click to browse your device. You can also drop multiple files at once for batch conversion.
- Confirm BMP as the target. BMP is pre-selected. Optionally open "Advanced settings" to tune quality, resolution, or other format-specific options.
- Click Convert. Your file is processed locally in your browser. The first run loads the conversion engine; subsequent files convert almost instantly.
- Download your BMP. When the conversion finishes, the BMP file downloads automatically. Nothing was uploaded, nothing is stored, nothing leaves your machine.
How the PNG → BMP Conversion Works
FileChange converts PNG to BMP using the browser Canvas API to redraw your image into the target encoder. The flow is straightforward: your PNG file is read from disk via the File API, decoded into an intermediate representation, transformed into the BMP target, and offered back as a download. Every step runs on your own device — there is no server in the loop, no queue, and no third-party storage. The same approach is used by professional desktop converters; running it in the browser just removes the install step.
Top Use Cases for PNG to BMP
- Converting a PNG into a BMP to feed an older Windows program or imaging tool that only loads uncompressed bitmaps.
- Preparing a PNG as a BMP for an embedded display or legacy hardware workflow that expects raw pixel data rather than a compressed image.
- Open PNG files in apps and platforms that only accept BMP
- Reduce file size for email, messaging, and web delivery by switching from lossless image format with transparency to uncompressed Windows bitmap
- Batch convert many PNG files at once without uploading them anywhere
- Keep sensitive PNG content private — the conversion happens entirely on your device
- Avoid signup walls, watermarks, and trial limits on competing online converters
- Prepare PNG images for BMP-only platforms (some CMSs, email clients, design tools)
About the PNG Format
PNG is a lossless raster image format created in 1996 as a patent-free replacement for GIF. Every pixel in a PNG file is stored exactly as saved, with no compression artifacts or quality degradation. PNG supports full alpha channel transparency, making it the standard format for logos, icons, screenshots, UI elements, and any image that requires crisp edges or transparent backgrounds. A PNG is the same pixels as a BMP, just compressed losslessly to save space. As the source it loses nothing in this conversion; it's simply being unpacked into BMP's uncompressed layout.
PNG was created in 1996 as a patent-free replacement for GIF, then quickly adopted as the web standard for graphics and screenshots.
About the BMP Format
BMP (Bitmap) is one of the simplest raster image formats, developed by Microsoft for Windows. BMP files store pixel data with minimal or no compression, resulting in very large files that preserve every pixel exactly. The format was originally designed for the Windows GDI (Graphics Device Interface) and remains the native image format for many Windows system operations. BMP is the raw, no-frills target: every pixel written out plainly with no compression. That simplicity is exactly why some older or low-level Windows tools prefer it, even though it makes the file big.
BMP was created by Microsoft for Windows 1.0 in 1985 and still occasionally produced by paint programs.
PNG vs BMP — Side-by-Side
| PNG | BMP |
|---|
| Compression | Lossless (DEFLATE) | Uncompressed (optional RLE) |
|---|
| Transparency | Yes | Yes |
|---|
| Animation | No | No |
|---|
| Max Colors | 16.7 million (24-bit) or 281 trillion (48-bit) | 16.7 million (24-bit) or 4.3 billion (32-bit) |
|---|
| Color Space | RGB, RGBA, Grayscale, Indexed | RGB, RGBA |
|---|
| Bit Depth | 1, 2, 4, 8, or 16-bit per channel | 1, 4, 8, 16, 24, or 32-bit |
|---|
| Metadata | tEXt, iTXt, zTXt chunks | Minimal (file header only) |
|---|
Quality tips for PNG → BMP
When converting PNG to BMP, the single most impactful setting is the output quality slider. Above 85% you cannot perceive any compression artifacts in normal viewing; below 60% the image starts to feel visibly degraded. FileChange defaults to 92% quality, which is visually lossless for nearly all photographs and screenshots. If BMP is a lossless format (PNG, BMP, TIFF), the quality slider is irrelevant — every pixel is preserved exactly. For PNG to BMP conversions involving a lossy target, you can also resize down to the actual display size to drop file size further without any visible loss. FileChange exposes both controls under "Advanced settings" before you hit Convert. Both formats are pixel-exact and lossless, so the BMP looks identical to the PNG; the only real change is size, because BMP stores every pixel uncompressed and the file will be substantially larger than the PNG.
Troubleshooting
PNG can have a transparent alpha channel, but BMP is most commonly used as a plain opaque bitmap, so any transparency in your PNG may be flattened or filled when it becomes a BMP.
If your PNG has transparent areas, composite it onto the background color you want, such as white, before converting, so the resulting BMP shows that color instead of an unexpected fill where the transparency used to be.
The conversion is slower than expected
Heavy formats (video, large PDFs, big audio files) run entirely on your CPU. The first conversion in a session loads the WASM engine (about 30 MB for FFmpeg, 2 MB for PDF.js) — subsequent conversions reuse the loaded engine and run much faster. Close other heavy tabs to free memory.
The output BMP looks different from my PNG
Format conversions are not always pixel-identical. Color spaces, font substitutions, and metadata can shift. For best fidelity, use the highest-quality original you have, and pick lossless target formats (PNG, FLAC, WAV) when fidelity matters more than file size.
The browser ran out of memory
Very large files (multi-GB videos, 1000-page PDFs) can exhaust a browser's memory. Split the file into smaller chunks, close other tabs, or use a desktop converter for files over 2 GB.
The colors look washed out or off
Color profile data sometimes does not survive a conversion. Most browsers assume sRGB; if your source has a wide gamut profile (Display P3, Adobe RGB), the output may render flatter. Open the converted file in software that respects embedded color profiles for accurate color.
Frequently Asked Questions about PNG to BMP
Why is my BMP so much bigger than the PNG?
BMP stores every pixel uncompressed, while PNG compresses the same pixels losslessly. The images are identical in appearance, but the BMP carries no compression, so it takes up considerably more space.
Does converting PNG to BMP lose any image quality?
No. Both formats are lossless and pixel-exact, so the BMP looks exactly like your PNG. Only the file size changes.
What happens to my PNG's transparency in the BMP?
Standard BMP output is treated as opaque, so transparent areas are typically filled with a background color. Flatten the PNG onto your desired background first if you want to control that color.
Is FileChange's PNG to BMP converter really free?
Yes, completely free. There is no signup, no free trial that runs out, no credit card, and no watermark on the output. Convert as many PNG files to BMP as you need, as often as you want.
Is my PNG file uploaded to a server when I convert to BMP?
No. The conversion runs entirely inside your browser using the browser Canvas API to redraw your image into the target encoder. Your file is read locally, processed on your CPU, and the resulting BMP is generated on your device. Nothing is transmitted, stored, or logged anywhere.
How long does PNG to BMP conversion take?
Image conversion is nearly instant — typically under a second. Very large images (50+ megapixels) take a few seconds longer because of the canvas redraw.
Is there a file size limit when converting PNG to BMP?
There is no hard cap — your device's available memory is the real ceiling. In practice, most PNG files up to a few hundred megabytes convert without issues. Very large files (multi-GB videos, thousand-page PDFs) may slow down or fail on low-memory devices.
Can I batch-convert multiple PNG files to BMP at once?
Yes. Drop as many PNG files as you like in a single batch and FileChange converts them all in one click. Each file is processed independently and then offered as a download.
Related PNG and BMP conversions
Learn more about PNG and BMP