JPG to BMP Converter
BMP is the plain, uncompressed bitmap that Windows has understood since 1990, and some software and hardware still read nothing else. This JPG to BMP converter decodes your JPG once and writes every pixel out as a standard Windows bitmap.
Image Converter
or drop JPG, JPEG, JPE … files here ·
Max 95 MB per file· Up to 20 files· Deleted after 30 minutes
Files are processed on our servers and deleted after 30 minutes.
85 keeps photos visually identical to the original. Lower it only when you need a smaller file.
JPG, BMP and EPS have no transparency. Transparent pixels are filled with this color.
Hex color used behind transparent pixels, e.g. #FFFFFF.
This format holds a single image. Choose GIF or WebP output if you want to keep the animation.
A multi-size icon contains several resolutions in one file; browsers and operating systems pick the one they need.
Keep the original dimensions, or enter one side and the aspect ratio is kept.
Pixels for the side you chose above.
Percentage of the original dimensions.
sRGB is right for screens and the web. Keep the original for print workflows; grayscale discards color.
Metadata only, 0 keeps the original value. Printers and some portals read this number; it does not change pixel dimensions.
How to use this tool
- 1
Add the JPG files
Drag up to 20 JPG or JPEG files onto the upload area; each can be up to 95 MB.
- 2
Match the target size
Devices and boot screens usually need exact dimensions. Under Advanced settings, use Resize output image to set the width the device expects, for example 320 px for a small display.
- 3
Convert to BMP
Press Convert to BMP and download the files one by one or as a ZIP.
Where JPG to BMP conversion is still required
BMP grew up with Windows. The bitmap header most files use today arrived with Windows 3.0 in 1990, and for two decades BMP was the default output of Paint, the wallpaper format of early Windows versions and the simplest way to hand pixels between programs. Software from that period often fails on a JPG with an unhelpful error.
Hardware is the other big group. Reading a BMP needs no decompression: skip a fixed-size header, then read rows of pixel values, stored bottom row first and padded to a multiple of 4 bytes. That is easy to do on a small microcontroller, which is why display libraries such as Adafruit's ImageReader for Arduino load uncompressed 24-bit BMP files from an SD card, and why many motherboard boot-logo utilities, label printers and digital photo frames ask for bitmaps.
Editing pipelines are the third case. Resaving a JPG after every edit adds another round of compression; saving to BMP, or to JPG to PNG if the software accepts PNG, keeps the pixels fixed.
BMP file size by bit depth for a 1920 × 1080 image
| Bit depth | Colors | Pixel data | Typical use |
|---|---|---|---|
| 1-bit | 2 (palette) | 259,200 bytes ≈ 0.26 MB | Thermal printers, e-paper, monochrome LCDs |
| 4-bit | 16 (palette) | 1,036,800 bytes ≈ 1.04 MB | Old Windows icons and setup screens |
| 8-bit | 256 (palette) | 2,073,600 bytes ≈ 2.07 MB | Boot logos, simple graphics |
| 24-bit | 16.7 million | 6,220,800 bytes ≈ 6.22 MB | Photos; the output of this converter |
| 32-bit | 16.7 million + alpha | 8,294,400 bytes ≈ 8.29 MB | Images with transparency |
What BMP gives you
- Opens in any version of Windows and in almost every image library
- Readable by tiny devices with no JPEG decoder
- No further quality loss when edited and saved again
What it costs
- Files many times larger than the JPG
- Too heavy for email, web pages and upload forms
- Metadata such as camera details is not carried over
JPG
JPEG image
JPEG (or JPG) is the most widely used photo format, standardised by the Joint Photographic Experts Group in 1992. It uses lossy compression that discards fine detail the eye is unlikely to notice, which keeps photos small enough for the web, email and phone storage. It handles smooth gradients and natural scenes well, but sharp text, line art and flat colours pick up visible blocky or fuzzy artefacts. JPEG has no transparency and no animation, and every re-save loses a little more quality. Every browser, phone, camera and image editor can open it.
- Compression
- Lossy
- Transparency
- No
- Animation
- No
- Introduced
- 1992 · Joint Photographic Experts Group
BMP
Bitmap image
BMP is Microsoft's device-independent bitmap format, native to Windows since its early versions. It usually stores pixels uncompressed, so quality is perfect but files are very large compared with PNG or JPEG. Newer BMP versions can hold an alpha channel, but many programs ignore it. The format is simple to read and write, which keeps it alive in older software, embedded systems and some industrial tools. Windows, macOS and nearly every image editor can open BMP files.
- Compression
- Lossless
- Transparency
- Yes
- Animation
- No
- Introduced
- Microsoft
JPG becomes BMP when an older Windows program, a boot-logo tool or an embedded display wants raw pixels it can read without a JPEG decoder; the file grows a lot, and that is accepted on purpose.
Preparing a BMP for a screen or a boot logo
Devices are strict about dimensions. A 2.8-inch TFT shield is commonly 320 × 240 px, and boot-logo tools usually state an exact size. Resize during conversion so the bitmap matches, and keep the file name short, since many embedded file readers only handle 8.3 names.
Check the orientation, too. The converter applies the JPG's EXIF rotation, so the BMP comes out upright as you see it in a photo viewer, which is what most devices expect.
JPG to BMP converter FAQ
Why is my BMP ten times bigger than the JPG?
Because BMP stores every pixel as raw numbers with no compression. A 1920 × 1080 picture at 24 bits per pixel is 6,220,800 bytes of pixel data no matter what it shows, while the same photo as a JPG is typically a few hundred kilobytes. The size is the price of being simple to read.
Does converting JPG to BMP improve quality?
No. BMP is lossless, so it keeps exactly what the JPG contained from this point on, including any compression artifacts already in the JPG. It stops further loss if you edit and resave many times, but it cannot restore detail.
What bit depth does the converted BMP have?
A JPG has no transparency, so the result is a standard full-color bitmap at 24 bits per pixel, the variant every program and library reads. If a device wants a 1-bit or 8-bit palette bitmap, convert here first and reduce the colors with the tool the device maker provides.
Can I convert a JPG to a black and white BMP?
Set Color space to Grayscale under Advanced settings and the BMP comes out in shades of gray. For a strict two-color result, such as for a thermal printer or an e-paper panel, apply a threshold with convert photo to black and white first.
Which Windows programs still save BMP by default?
Paint saved 24-bit bitmaps by default up to Windows XP and switched its default to PNG in Windows 7. Many scanner utilities and industrial programs written in that era still default to BMP today.