BMP to PNG Converter — Lossless, Sharp Text, 70–95% Smaller

How to convert BMP to PNG

1. Drop your BMP files onto the converter above — or click to browse and select multiple files.
2. Click Convert on any individual file, or Convert all to process the entire batch at once.
3. Download individually or click Download all for a ZIP archive.
4. Tip: BMP to PNG is perfectly lossless — every pixel preserved exactly. Use PNG for screenshots and UI; use JPG for photographs.

Screenshots stay on your device — no upload, no exposure

BMP files from IT environments can be 6–20 MB each — too large for most server-based converters. This tool processes everything in your browser — screenshots from internal systems stay on your device, never sent to any server.

Once the page loads, the tool works offline. Useful when converting screenshots from an RDP session or air-gapped machine — export the BMP, convert locally, send the PNG without any internet required.

// BMP has no transparency — direct lossless encode
const canvas = document.createElement('canvas')
canvas.width = img.width
canvas.height = img.height
canvas.getContext('2d').drawImage(img, 0, 0)
// No quality param — PNG is lossless by spec
canvas.toBlob(cb, 'image/png')

Who converts BMP to PNG

IT support staff and sysadmins documenting error dialogs, configuration states, and terminal output. BMP is the default capture format in many Windows environments — converting to PNG keeps text and UI elements razor-sharp without the blurring that JPG introduces.

Software developers capturing code editor screenshots, debug output, and build logs for documentation or bug reports. PNG preserves monospace fonts and syntax highlighting colors exactly — JPG compression visibly degrades both.

Architects and engineers exporting technical diagrams from older CAD tools that output BMP. Converting to PNG preserves dimension lines, annotations, and technical notation that JPG compression softens.

BMP vs PNG — format comparison

When to use PNG vs JPG for BMP conversion

Convert BMP to PNG when:

• Screenshots with text — PNG keeps fonts, UI labels, and dialog text perfectly sharp
• Code and terminal captures — monospace text and syntax colors are preserved exactly
• Technical diagrams — CAD output, flowcharts, schematics need lossless precision
• Design tool import — Photoshop, Figma, and Sketch all prefer PNG for editing
• Lossless quality required — PNG guarantees zero pixel degradation on every save

Convert BMP to JPG instead when:

• Photographs — JPG achieves even smaller files with minimal visible quality loss for photo content
• Smallest file size needed — JPG is 3–4× smaller than PNG for the same photographic image
• No text or sharp edges — photographic BMP content compresses well as JPG without artifacts
• Email with photo attachments — JPG gives the best size-to-quality ratio for photographic sharing

How the conversion works

Your browser draws the BMP onto an HTML5 Canvas via the Canvas API, then encodes the pixel data as PNG using toBlob(). No quality parameter is passed — PNG is lossless by format specification, so every pixel is preserved exactly.

A 6 MB 1920×1080 BMP screenshot typically becomes 200–600 KB as PNG — 70–95% smaller depending on image complexity. Simple UI screenshots with large solid-color areas compress more than complex photographic content.

const blob = await new Promise(resolve => {
  const img = new Image()
  img.onload = () => {
    const canvas = Object.assign(
      document.createElement('canvas'),
      { width: img.width, height: img.height }
    )
    canvas.getContext('2d').drawImage(img, 0, 0)
    // Lossless — 6 MB BMP → ~400 KB PNG
    canvas.toBlob(resolve, 'image/png')
  }
  img.src = URL.createObjectURL(bmpFile)
})