BMP to PNG Converter Online Free
Convert legacy bitmap (.bmp) files into modern PNG for editors, websites, and archives that expect PNG — without uploading your file anywhere.
Drop BMP here
BMP files supported
What this tool solves
BMP remains common in Windows-centric workflows and older scanners, but designers and developers usually want PNG for lossless interchange, transparency-capable exports, and predictable behaviour in browsers. This page targets the query BMP to PNG specifically — not generic “image converter” fluff — so you land on a locked PNG output with clear expectations about losslessness and alpha.
Recommended specification
| Topic | Guidance |
|---|---|
| Input format | .bmp — typical 24-bit truecolour; some 32-bit variants with alpha |
| Output format | PNG — lossless compression, widely supported |
| Colour fidelity | Pixels preserved vs JPEG-style loss |
| When JPG wins | Photographic content destined for smallest file — use BMP to JPG instead |
How to use
- Upload your BMP via drag-and-drop or file picker.
- Run conversion — preview appears in the tool.
- Download PNG. Optional: run Compress PNG if a portal enforces KB limits without demanding JPG.
Best practices
- Use PNG when text edges, UI captures, or logos must stay crisp.
- For natural photos where only file size matters, JPG is often the better next step after BMP → see BMP to JPG.
- Keep BMP masters for archival if storage allows — then derive PNG/JPG copies for delivery.
Common mistakes
- Assuming PNG is always smaller than BMP — it usually is for flat graphics, not always for noise-like content.
- Expecting JPG-size files from PNG — for photos at the same dimensions, JPG is typically much smaller.
Privacy and quality
Local processing avoids the privacy and retention questions that come with server-side converters. Decode quality depends on your browser’s BMP support; the tool does not sharpen or denoise automatically — what you decode is what you encode to PNG.
Cannibalization note
Closest sibling: BMP to JPG. This page is distinct: users who type “bmp to png” want PNG specifically (lossless, transparency-friendly). Users who want smallest photo files should use the JPG route.
Frequently Asked Questions
Is BMP to PNG lossless?
For typical 24-bit BMP files, decoding to pixels and encoding as PNG preserves the image data without JPEG-style loss. File size may still change because PNG uses compression — often smaller than raw BMP for flat graphics, sometimes larger for noisy photos.
Will transparency be preserved?
Standard Windows BMP files are usually opaque. If your BMP includes an alpha channel in a format your browser decodes, PNG can store transparency. If the source has no alpha, the PNG will be opaque.
Why is my PNG larger than the BMP?
Uncompressed BMP can be enormous, but simple images sometimes compress poorly as PNG if they contain photographic noise. For natural photos where size matters more than perfect losslessness, BMP to JPG is often smaller.
Are images uploaded to a server?
No. Conversion uses your browser only. Your BMP never leaves your device.
Can I convert 32-bit BMP icons?
Modern browsers generally decode common BMP variants. Very old or exotic encodings might fail — re-export from an image editor as standard BMP if you see an error.
How is this different from BMP to JPG?
PNG is lossless and supports transparency. JPEG is smaller for photos but lossy and has no transparency. Pick this page when you need PNG’s strengths.