rankato
Log in
Image Tools

Convert BMP to PNG

Drop up to 20 BMP files and download PNG results in seconds. Everything runs in your browser using the same WebAssembly codecs Google uses in Squoosh.

Files never leave your browser — 100% private

Batch up to 20 images · 20 MB per file · no watermarks, no signup

Drop anywhere
Drag files onto any part of this page
Paste from clipboard
Copy an image, press Ctrl+V
Best-in-class encoders
MozJPEG + oxipng + sharp-YUV WebP · production tuned

This converter takes BMP images and produces PNG output using in-browser WebAssembly codecs. Batch up to 20 files, tune quality, resize on the fly, and strip metadata for privacy. Your images never leave the tab — no uploads, no accounts, no queue.

Why convert BMP to PNG?

BMP is a Windows-native uncompressed format — a 1920×1080 BMP is ~6 MB, while the same content as PNG is 200 KB–1 MB. Convert BMP → PNG for a ~90% size reduction with zero quality loss (both are lossless), and to unlock browser and cross-platform support.

Quality controls

Three presets — Best (visually lossless), Balanced (default, ~80 quality), and Smallest (aggressive). Advanced panel exposes quality (1–100), effort (0–6 where supported), chroma subsampling, resize, and metadata stripping. Every change previews instantly and shows the before/after size delta so you can dial in your target.

Privacy and batch

Drop up to 20 files at once — each is decoded, converted, and re-encoded sequentially so WebAssembly memory stays bounded on low-end devices. Per-file thumbnails, size deltas, and per-file downloads. Download all (.zip) for a single archive. Every file is processed client-side; nothing appears in a network request.

More SEO Essentials

Continue optimizing your site with our other free, high-performance tools.

Free

Convert Image to WebP

Convert JPEG, PNG, HEIC, AVIF, GIF, BMP, TIFF, or SVG to WebP with visually-lossless quality. Batch up to 20 files. 100% client-side.
Try Tool Free

Convert Image to AVIF

Convert JPEG, PNG, HEIC, WebP, GIF, BMP, TIFF, or SVG to AVIF — the next-generation format that beats WebP by 10–20% at the same visual quality.
Try Tool Free

Convert Image to JPEG

Convert HEIC, PNG, WebP, AVIF, GIF, BMP, TIFF, or SVG to JPEG using MozJPEG — the smallest, sharpest JPEG encoder available. Batch up to 20 files.
Try Tool Free

Convert Image to PNG

Convert JPEG, WebP, AVIF, HEIC, GIF, BMP, TIFF, or SVG to PNG — losslessly optimized with oxipng for the smallest possible file. Batch up to 20 files.
Try Tool Free

Image Compressor

Shrink your images without changing their format. JPEG stays JPEG, PNG stays PNG. MozJPEG + oxipng + libwebp — batch up to 20 files, 100% client-side.
Try Tool Free

Smart Image Optimizer

One-click web-ready images. The optimizer picks the best modern format (WebP or PNG) per file, applies best-in-class encoder tuning, and hands you production-ready assets.
Try Tool

Tool FAQs

Everything you need to know about using BMP to PNG Converter.

Does PNG really produce smaller files than BMP?+

For photographic content, yes — typically 25–50% smaller at equivalent visual quality. For content already optimized in BMP (icons, small graphics), gains may be modest. The tool preserves the original when the encoded result would be larger.

Is transparency preserved?+

Depends on the target format. WebP, PNG, AVIF, and TIFF preserve alpha losslessly. JPEG has no alpha channel — semi-transparent pixels get composited over a background color you choose. The tool warns before flattening.

Does anything leave my browser?+

No. Codecs run as WebAssembly directly in your tab. Open DevTools → Network while dropping files and you'll see zero requests fire. That's why HEIC, unreleased designs, and confidential client work all stay private.