Why convert BMP to PNG?

BMP is an uncompressed Windows bitmap format, so files are huge. PNG stores the exact same pixels with lossless compression, typically shrinking files massively while staying web-friendly.

Does the conversion lose quality?

No. PNG is lossless, so every pixel of your BMP is preserved exactly — only the file size changes.

What are the size and usage limits?

Anonymous users get 1 free server conversion up to 20 MB. A free account allows 50 MB files, 3 conversions per 30 days and batches of 5. Paid users get 200 MB files and batches of 100.

How much smaller will the PNG be than my BMP?

It depends on the image, but BMP stores every pixel with no compression at all, so PNG — which compresses losslessly — is very often 50–90% smaller, especially for images with flat colors or large plain areas.

I had trouble with a BMP before — will it convert now?

Yes. Our decoder correctly handles both standard bottom-up BMP files and top-down (negative-height) BMP files, a variant that trips up many converters.

Can I convert several BMP files to PNG at once?

Yes, in a batch. Free accounts can batch up to 5 files at a time; paid accounts up to 100. Anonymous users convert one file per free server conversion.

BMP to PNG Converter

Convert BMP to PNG online for free. Lossless quality, dramatically smaller files. Upload your bitmap and download the PNG in seconds.

Drop files here or click to upload

BMP · up to 20.0 MB per file

Files are private and deleted after conversion

How to use BMP to PNG Converter

01
Upload your BMP file
Drag and drop or browse to a .bmp file — up to 20 MB for anonymous use, 50 MB with a free account, or 200 MB on a paid plan. The upload is sent over HTTPS.
02
Automatic lossless conversion
There is nothing to configure. The uncompressed BMP bitmap is decoded — including both standard bottom-up and top-down (negative-height) variants — and re-encoded as a lossless PNG, shrinking the file dramatically while keeping every pixel.
03
Download your PNG
Grab the converted file through a signed download link in seconds. The output is auto-deleted from our servers within 24 hours, and the uploaded BMP within 6–24 hours.

Why choose our BMP to PNG Converter

Dramatic size reduction, zero quality loss

BMP stores pixels with no compression at all, so converting to lossless PNG typically shrinks files by 50–90% while keeping every pixel exactly the same.

Fully automatic, no settings

There are no options to configure — upload your bitmap and get a converted PNG back in seconds, including files saved bottom-up or top-down.

Your files stay private

Uploads travel over HTTPS, converted outputs are auto-deleted within 24 hours, and uploaded BMPs are removed within 6–24 hours.

Free to use

Anonymous visitors get 1 free server conversion up to 20 MB; a free account adds 3 conversions every 30 days at 50 MB with batches of 5.

No signup to try it

Convert your first BMP instantly without creating an account — sign up only when you need more conversions, bigger files, or batches.

Settings guide

Automatic lossless conversion: There is nothing to configure. The BMP bitmap is decoded and re-encoded as a lossless PNG, so every pixel is preserved while the file gets dramatically smaller than the uncompressed original.

About the formats

BMP

BMP is the legacy Windows bitmap format, dating back to early versions of Microsoft Windows. Files are usually stored uncompressed, and they typically come from old Windows software, scanners, or system screenshots.

BMP stores pixels exactly and is trivially simple to read, but the lack of compression makes files enormous — often many times larger than an equivalent PNG. Browsers and mobile apps handle it poorly, and there is no benefit that justifies the size. Convert BMP to PNG to keep lossless quality, or to JPG for photographs where smaller files matter.

PNG

PNG is a lossless raster image format created in the mid-1990s as a patent-free replacement for GIF. It is the standard choice for screenshots, logos, UI graphics, and any image that needs transparency.

PNG preserves every pixel exactly and supports a full 8-bit alpha channel, so text and sharp edges stay crisp. The downside is size: photographs saved as PNG are far larger than the same image as JPG or WebP. Support is universal in browsers and editors, making it a safe default for graphics — just avoid it for large photo collections.

Troubleshooting

My file won't upload: Check that the file really is a Windows bitmap with a .bmp extension. Files renamed from other formats are rejected — re-export as BMP from your editor if unsure.
Upload rejected for being too large: BMP files are uncompressed and get big fast. Anonymous uploads are capped at 20 MB; sign in for 50 MB free, or upgrade for files up to 200 MB.
Colors look wrong in the PNG: Rare BMP variants (16-bit or exotic palette encodings) can decode with shifted colors. Open the file in an image editor, re-save it as a standard 24-bit BMP and convert again.

FAQ

Why convert BMP to PNG?: BMP is an uncompressed Windows bitmap format, so files are huge. PNG stores the exact same pixels with lossless compression, typically shrinking files massively while staying web-friendly.
Does the conversion lose quality?: No. PNG is lossless, so every pixel of your BMP is preserved exactly — only the file size changes.
Is my BMP file private?: Yes. Files are uploaded over HTTPS, converted outputs are auto-deleted within 24 hours, and uploaded inputs are removed within 6–24 hours.
What are the size and usage limits?: Anonymous users get 1 free server conversion up to 20 MB. A free account allows 50 MB files, 3 conversions per 30 days and batches of 5. Paid users get 200 MB files and batches of 100.
How much smaller will the PNG be than my BMP?: It depends on the image, but BMP stores every pixel with no compression at all, so PNG — which compresses losslessly — is very often 50–90% smaller, especially for images with flat colors or large plain areas.
I had trouble with a BMP before — will it convert now?: Yes. Our decoder correctly handles both standard bottom-up BMP files and top-down (negative-height) BMP files, a variant that trips up many converters.
Can I convert several BMP files to PNG at once?: Yes, in a batch. Free accounts can batch up to 5 files at a time; paid accounts up to 100. Anonymous users convert one file per free server conversion.