BMP to Base64 Converter

Convert BMP bitmap images into Base64 data URLs for embedding in HTML, email, or legacy apps

Upload a BMP bitmap and encode it as a Base64 data URL.

Data URL prefix: data:image/bmp;base64,

Drop a BMP file here or pick one below.

What is BMP to Base64 Converter

Last reviewed: April 18, 2026

BMP is an uncompressed bitmap format created by Microsoft that stores pixel data row-by-row. Because BMP files are usually large, Base64 is most useful for small icons or test fixtures.

BMP to Base64 Encoder takes a .bmp file and returns a `data:image/bmp;base64,…` data URL you can paste into HTML, CSS, or a JSON payload.

Why use it

Embed a small BMP test fixture into a unit test or snapshot.
Paste a bitmap directly into a JSON payload where only strings are allowed.
Inline tiny assets in an HTML artifact without hosting a file.
Encoding is 100% client-side.

Features

BMP file encoding
Byte-for-byte
Copy data URL or raw Base64
Drag-and-drop BMP upload
BMP processed locally
BMP preview before copy

How to use BMP to Base64 Converter

Drop a BMP. Drag a .bmp file into the tool or click Choose BMP.
Copy the data URL. Copy `data:image/bmp;base64,…` or the raw Base64 payload.
Embed it. Paste it into HTML, CSS, or a JSON string field.

Example (before/after)

BMP file

pattern.bmp (binary, 8 KB, 32×32 24-bit)

Base64 data URL

data:image/bmp;base64,Qk0eAAAAAAAAADYAAAAoAAAAIAAAACAAAAABABgAAAAAAOgC…

Common errors

Huge payloads

BMP is uncompressed — even modest images produce massive Base64 strings.

Fix: Convert to PNG or JPG first; use BMP→Base64 only for tiny assets or test fixtures.

Browser rendering quirks

Older browsers may not render every BMP variant (e.g., 16-bit or RLE-compressed).

Fix: Use a standard 24-bit or 32-bit uncompressed BMP for maximum compatibility.

FAQ

Are files uploaded?

No. Encoding happens entirely in the browser.

Why is the Base64 output so big?

BMP itself is uncompressed, and Base64 adds another ~33% overhead. For production assets, prefer PNG or WebP.

Does it preserve transparency?

Only if the source BMP uses a 32-bit ARGB variant that the browser respects.

Can I decode it back?

You can decode via the generic Base64 to Image tool, which auto-detects `image/bmp`.

Related tools

Related encoders and image tools: You can also browse the full Encoders & Decoders category for more options.

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