BMP to JPG

What is BMP?

BMP (Bitmap) is a raster image format developed by Microsoft for Windows and introduced in the late 1980s. A BMP file stores pixel data as an uncompressed bitmap, typically using 1-bit, 8-bit, 16-bit, 24-bit or 32-bit color depths. Because no compression is applied, BMP files are extremely large — a single 1920×1080 24-bit image is around 6 MB. BMP also supports basic alpha transparency in its 32-bit variant, though many older applications ignore it.

BMP's simplicity made it a common interchange format inside Windows for many years, and it is still produced by scanners, screen-capture tools, point-of-sale systems and some legacy applications. However, its enormous file size makes BMP unsuitable for the web, email attachments, mobile apps or any context where storage or bandwidth matters. Converting BMP to JPG is the standard way to shrink these files by 90% or more while keeping the image usable everywhere.

What is JPG?

JPG (also written JPEG, from Joint Photographic Experts Group) is a universally supported image format standard published in 1992. It uses lossy compression based on the discrete cosine transform (DCT) to dramatically reduce file size for photographs and continuous-tone imagery. JPG is the most widely used image format in the world: every modern web browser, operating system, image viewer, office application, social network and email client can open and display JPG files without any additional software or plugins.

JPG does not support transparency or animation, and its lossy compression introduces generation loss when an image is repeatedly re-encoded. Despite these limitations, JPG remains the default interchange format for photographs and web images because of its near-100% compatibility across devices, applications and platforms. Converting your BMP image to JPG reduces the file size by orders of magnitude while guaranteeing the file can be opened, viewed, edited and shared everywhere.

BMP vs JPG comparison

BMP and JPG represent opposite ends of the image-format spectrum. BMP stores pixels uncompressed and losslessly, while JPG uses lossy compression to achieve small file sizes. The table below summarises the key differences between BMP and JPG.

Feature	BMP	JPG
Year introduced	1985 (Windows)	1992
Compression	None (uncompressed bitmap)	Lossy (DCT-based)
Image quality	Lossless, pixel-perfect	Degrades on each re-save
Max color depth	32-bit (RGBA)	8-bit, sRGB only
Transparency	Limited (32-bit BMP only, often ignored)	No
Typical file size	Very large (e.g. ~6 MB for 1920×1080)	Very small (e.g. ~200–500 KB at the same size)
Browser support	Limited (most browsers support basic BMP)	Universal (every browser and device)
Software compatibility	Good on Windows, limited elsewhere	Near-universal
Best for	Windows-specific interchange, scanning	Photos, web images, email, sharing

In short, BMP is uncompressed and lossless but enormous, while JPG is compressed and lossy but tiny. Converting from BMP to JPG trades absolute losslessness for a dramatic reduction in file size and universal compatibility — the right trade for virtually all photographic and web uses.

When to use BMP to JPG conversion

Because BMP files are so large, converting them to JPG is almost always beneficial whenever the image needs to leave a Windows-specific workflow. The most common reasons to convert a BMP image to JPG are:

• Uploading to the web. A typical BMP is 10–20× larger than an equivalent JPG. Web uploads, form attachments and CMS libraries reject BMP or waste bandwidth.
• Email attachments. Email providers cap attachments around 25 MB; a single high-resolution BMP can exceed that on its own. JPG keeps the file small enough to attach.
• Mobile and embedded devices. Phones, tablets and embedded systems have limited storage and may not render BMP at all. JPG is universally supported.
• Document and office workflows. Word, PowerPoint, Excel, Google Docs and PDF tools embed JPG reliably and efficiently; BMP files bloat documents unnecessarily.
• Sharing with clients and partners. Recipients on macOS, Linux, iOS or Android can all open JPG without any special software, while BMP support varies.
• Archiving and backup. Converting a folder of scanned BMPs to JPG reduces storage by 90% or more, with no visible quality loss at 90% quality.

Keep your original BMP file as a master copy if you need pixel-perfect lossless storage. Use the JPG export for everyday sharing, web publishing, email and document embedding where small file size matters more than absolute fidelity.

How to convert BMP to JPG

Converting a BMP image to JPG with this tool takes only a few seconds and happens entirely inside your browser. No upload, no sign-up, and no installation are required. Follow these four steps:

1. Upload your BMP file. Click the upload area or drag and drop a .bmp file from your computer. The image is decoded locally and shown as a preview.
2. Adjust the JPG quality. Use the quality slider from 10% to 100% to balance file size and visual quality. 90% is a good default for photographs; lower values produce smaller files.
3. Convert to JPG. Click the "Convert to JPG" button. The tool re-encodes the decoded image to the JPG format via the Canvas API and shows the original and converted file sizes side by side.
4. Download the JPG. Click "Download JPG" to save the converted file to your device. The original BMP remains untouched on your computer.

Because every step runs locally in your browser using JavaScript, your BMP image is never uploaded to a server. This makes the conversion completely private, fast and suitable for sensitive or confidential images.