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Convert BMP to PNG

Convert BMP to PNG in seconds. Free, no signup, no watermark, no file-size limit. Your file is processed in your browser and never uploaded.

At a glance

Source
BMP
Target
PNG
Where it runs
Your browser
Cost
Free, unlimited
Account
Not needed
BMP

Converter

BMP to PNG

On device

Drop one or more bitmap image files.

or select bitmap image

Your file never leaves this browser

    The details

    What happens when you convert between document formats

    A raw, uncompressed Windows bitmap. Big, blunt and impossible to get wrong. The document is opened in a layout engine and re-saved in the target format, mapping each style onto the closest equivalent in the new format. The result is a lossless images with transparency. the safe choice for graphics, screenshots and scans, produced entirely inside your browser.

    What survives

    • The text and the paragraph structure
    • Most formatting: fonts, sizes, colours, alignment, lists and tables
    • Embedded images

    What changes

    • Styles that have no equivalent are approximated
    • The file may gain or lose features the target format does not support

    Where it goes wrong

    • Styles are usually mapped by name, so renaming a style before converting can lose the mapping
    • The target format may not support the same page size or margins

    Why anyone would do this

    Different teams use different formats, and the content should not be held hostage by that.

    About the format

    A raw, uncompressed Windows bitmap.

    A header followed by raw pixel rows, usually with 24 bits of colour per pixel and no compression at all.

    Where it is good
    • No compression means no artefacts, ever
    • Trivial to read, so almost any program can open it
    • The historical native format of Windows
    Where it falls short
    • Enormous — a 4000×3000 photo is around 35 MB
    • Almost nobody accepts it for upload or download
    • Loses every bit of metadata on the way
    You will find it on
    Legacy Windows software, graphics libraries, print drivers

    The thing people miss

    BMP is roughly ten times larger than the same image as PNG.

    About the target

    Lossless images with transparency.

    Deflate compression applied to raw pixel data, chunk by chunk. Nothing is thrown away, so the pixels you put in are the pixels you get out.

    • Lossless — no quality is lost, no matter how many times you convert
    • Supports full transparency
    • Handles flat graphics and text perfectly, with no compression artefacts

    Real jobs

    What people are actually doing with BMP

    A screenshot from an old Windows tool

    Interfacing with software that only speaks BMP

    Recovering an image from a program that will not export anything else

    Specification

    The details, in one table

    Source formatBMP — Bitmap image
    Target formatPNG — PNG image
    Typical source size3–40 MB
    RunsIn your browser
    Account neededNo
    WatermarkNone
    File extension.bmp → .png

    How to

    BMP to PNG, step by step

    1. 01

      Add your bitmap image

      Drag the file onto the drop zone, or tap to browse. Only one file is needed.

    2. 02

      Choose the PNG settings

      Set the PNG-specific options — everything happens locally, so the speed is your device, not a queue.

    3. 03

      Download the result

      The finished PNG downloads to your device. Nothing is uploaded and nothing is retained.

    Also available

    BMP converts into

    PDFPDF documentJPGJPEG image

    Questions

    BMP conversion questions

    What actually happens to my BMP file when I convert it to PNG?

    The document is opened in a layout engine and re-saved in the target format, mapping each style onto the closest equivalent in the new format. So the BMP file is unpacked, the content is laid out, and the result is written out as PNG. The text and the paragraph structure survives unchanged.

    Will converting BMP to PNG reduce the quality?

    Partly. Styles that have no equivalent are approximated The text itself is never re-typed, so no words are lost.

    Is my BMP file uploaded to a server?

    No. This BMP to PNG conversion runs as JavaScript inside your browser tab. The file is read from your device and the result is written back to your device, so there is no upload step, no file-size limit and no copy of your BMP file on any server.

    Do I need an account or will there be a watermark?

    Neither. There is no sign-up step, no email capture and no watermark on the output. The only limits are the ones your own device imposes.

    What is the most common mistake people make when converting BMP to PNG?

    Styles are usually mapped by name, so renaming a style before converting can lose the mapping

    Why would somebody convert BMP to PNG at all?

    Different teams use different formats, and the content should not be held hostage by that. In short: a screenshot from an old windows tool

    Something most people do not know about BMP?

    BMP is roughly ten times larger than the same image as PNG.