---
title: "BMP to PNG Converter — Lossless, No Upload | Compress Pro"
description: "Convert BMP bitmaps to lossless PNG in your browser — same pixels at a fraction of the size, transparency kept. Batch support, nothing uploaded. Free."
canonical: https://compress-pro.com/bmp-to-png
---

# Convert BMP to PNG.

> Raw BMP bitmaps into tidy lossless PNGs — all in-browser.

Convert BMP bitmaps to PNG entirely in your browser — **lossless by default, processed on your device**. Same pixels, dramatically fewer bytes: PNG compresses what BMP stores raw, and transparency, where the BMP carries it, survives intact.

**No uploads · No ads · Free & open source.**

## How it works

1. Drop files anywhere on the page, click to browse, or paste with Ctrl/⌘ + V.
2. Pick a quality or preset — or set an exact target size and let the tool find it.
3. Compress, compare before/after, and download — individually or as a ZIP.

## Lossless, unlike BMP to JPG

PNG stores the decoded bitmap exactly, which makes it the right exit for diagrams, pixel art and screenshots with sharp text — everything JPG smears. Photographic BMPs are the exception: [BMP to JPG](https://compress-pro.com/bmp-to-jpg) lands them far smaller with no visible cost. If the PNG itself feels heavy afterwards, [Compress PNG](https://compress-pro.com/compress-png) shrinks it losslessly or via palette reduction.

## Frequently asked questions

### Is the conversion really lossless?

Yes — at the default quality 100 every pixel is carried over exactly. Lowering the quality slider switches to palette PNGs: much smaller, slightly lossy, often indistinguishable for flat graphics.

### How much smaller than BMP?

Typically 5–20× — BMP spends three or four bytes on every pixel regardless of content, while PNG actually compresses. Flat-color screenshots and diagrams shrink the most.

### PNG or JPG for my BMPs?

PNG for graphics, text and pixel art — sharp edges stay sharp. JPG for photographic content, where it lands several times smaller again.

### Are my files uploaded?

No — the pixels never leave your machine. Decoding and re-encoding both happen in your browser; there is no upload to wait for and no server-side copy to worry about afterwards. Want proof? Run one file through, switch your connection off, and run another — it still works.

## Related tools

- [Convert BMP to JPG](https://compress-pro.com/bmp-to-jpg)
- [Compress PNG images](https://compress-pro.com/compress-png)
- [Convert TIFF to PNG](https://compress-pro.com/tiff-to-png)

---

Part of [Compress Pro](https://compress-pro.com/) — every tool page has a markdown twin at `<page url>.md`. Full tool index: [llms.txt](https://compress-pro.com/llms.txt)