Convert Windows BMP bitmaps to PNG in bulk, pixel for pixel. Free, no watermark, and your files never leave your browser.
No images yet. You can also drop files on this box.
Changes apply to every image instantly. Size and aspect ratio stay the same.
BMP files are usually stored uncompressed, while PNG compresses losslessly: every pixel stays exactly the same, and the file gets smaller, by a lot for screenshots, diagrams and icons with flat colors, and barely for photos. Measured in Chrome with this tool: a 1280×900 Wikipedia screenshot went from 3.30 MB as BMP to 394 KB as PNG (8 times smaller), while a 640×480 camera photo only went from 900 KB to 880 KB. PNG also opens in every browser and upload form. For photos where a small file matters more than exact pixels, BMP to JPG is much smaller still.
Each file is decoded by your browser, drawn onto a canvas at its original size and re-encoded in the format you chose. Nothing is uploaded. Phone photos are rotated the right way up, and EXIF metadata (camera, GPS location) is removed. SVG files are rasterized at their own width and height. HEIC photos from iPhones are decoded on this page with libheif (compiled to WebAssembly, via the open-source heic-to library, LGPL), so they work in every browser, not just Safari. The decoder (about 0.8 MB) only downloads when you add a HEIC file. TIFF files are decoded with the MIT-licensed UTIF.js (about 80 KB, loaded only for TIFFs), and every page of a multi-page TIFF becomes its own image. The same library writes TIFF output: uncompressed baseline RGB, or RGBA with a straight alpha channel when the image has transparency you keep.
Other conversions: Image: JPG, PNG and WebP, PNG to JPG, JPG to PNG, PNG to JPEG, JPEG to PNG, WebP to PNG, WebP to JPG, PNG to WebP, JPG to WebP, HEIC to JPG, HEIC to PNG, AVIF to JPG, AVIF to PNG, GIF to PNG, BMP to JPG, JFIF to JPG, JFIF to PNG, JPG to JPEG, JPEG to JPG, ICO to PNG, TIFF to JPG, TIFF to PNG, GIF to JPG, JPG to TIFF, PNG to TIFF. Need it smaller too? Use the image compressor (target size in KB) or resize the image to exact pixels.
If your images are screenshots of web pages, skip the conversion step. The Shotmint API renders any URL or HTML in Chromium and returns a PNG, JPG or WebP directly:
curl "https://shotmint.creasework.com/v1/screenshot?url=https://example.com&format=webp&quality=80" -H "X-API-Key: YOUR_KEY" -o page.webpEach screenshot is 1 credit. €5 buys 2,000 with no subscription, and credits never expire.
Get 25 free renders a month Try a website screenshot
Are my images uploaded? No. The conversion runs in JavaScript on this page, so it works for private photos and ID scans, and even offline once the page has loaded.
Does converting lose quality? To PNG: no new loss. To JPG or WebP: a little, set by the quality option. "Maximum" is visually identical for almost any image. Converting never adds back detail that was already lost.
Is there a limit? No file count limit and no watermark. Very large images (over about 50 megapixels) depend on your device's memory.
What about animated GIF or WebP? Only the first frame is converted.
BMP to PDF · BMP to JPG Converter · PNG to ICO · PNG / JPG to SVG (vectorize) · SVG to PNG · AVIF to PNG Converter · Compress PNG · GIF to PNG Converter · HEIC to PNG Converter · HTML to PNG Converter · ICO to PNG Converter · JFIF to PNG Converter · JPEG to PNG Converter · JPG to PNG Converter · PDF to PNG · PNG to JPEG Converter · PNG to JPG Converter · PNG to PDF · all free tools