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Convert JPG to BMP Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your JPG
Click the upload button or drag and drop your JPG file. Upload up to 10 files for batch conversion.
2Choose BMP output
BMP is selected by default on this page. Adjust quality settings if needed.
3Download
Click Convert and download your BMP file. For multiple files you get a ZIP archive.
Supported Image Formats
JPG
Universal format for photos. Supported everywhere, great balance between quality and file size.
BMP
Uncompressed bitmap format. Maximum quality but very large file size.
HEIC
Apple photo format used by iPhone and iPad. High quality with small file size.
HEIF
High Efficiency Image Format — same as HEIC, used on Apple devices.
WebP
Modern image format by Google. Up to 30% smaller than JPG with the same quality.
PNG
Lossless format that preserves every pixel. Best for screenshots and logos.
GIF
Classic format for simple animations. Supports transparency and up to 256 colors.
TIFF
Professional lossless format used in printing and photography.
AVIF
Next-gen format with excellent compression. Up to 50% smaller than JPG.
PPM
Portable Pixmap format used in Unix/Linux environments.
HDR
High Dynamic Range format storing extended brightness data.
FITS
Flexible Image Transport System used in astronomy and science.
PDF
Portable Document Format. Convert PDF pages to JPG, PNG or WebP images.
AVIF vs WebP vs HEIC vs JPG
Quick comparison to help you choose the right format
AVIF
- Size: Up to 50% smaller than JPG
- Browsers: Chrome, Firefox, Safari
- Transparency: ✓
- Best for: Web performance
WebP
- Size: 25-35% smaller than JPG
- Browsers: All modern browsers
- Transparency: ✓
- Best for: Web compatibility
HEIC
- Size: ~50% smaller than JPG
- Browsers: Safari only
- Transparency: ✓
- Best for: iPhone storage
JPG
- Size: Baseline
- Browsers: All browsers & apps
- Transparency: ✗
- Best for: Universal sharing
Frequently Asked Questions
- Does converting JPG to BMP improve image quality?
- No. JPEG compression permanently discards detail during encoding. Converting to BMP preserves exactly what remains — no quality is gained, but no additional quality is lost either. The benefit is that BMP prevents further generation loss in subsequent edits.
- Why is my BMP file so much larger than the JPG?
- BMP stores every pixel as raw, uncompressed bytes — 3 bytes per pixel for 24-bit color. A 1920×1080 JPG at quality 85 is roughly 500 KB; the same image as 24-bit BMP is 5.93 MB. This 10–15× size increase is inherent to the format.
- Can BMP have transparency?
- Yes, but only in 32-bit BMP with the BITMAPV5HEADER (124 bytes, Windows 98+). Since JPG has no alpha channel, the converted BMP will have all pixels set to fully opaque. For transparency, convert to PNG instead.
- Which BMP variant does Convertify output?
- 24-bit BMP with the standard BITMAPINFOHEADER (40 bytes) by default — the most universally compatible variant. 32-bit with BITMAPV5HEADER is available for workflows requiring alpha channel support.
- Is BMP lossless?
- Yes. BMP stores raw pixel data with no compression (the RLE variants exist but are rarely used). The conversion from JPG to BMP is lossless — the lossy step already happened when the JPG was originally created.
- What programs open BMP files?
- Virtually everything: Windows Paint, Photos, Explorer, macOS Preview, GIMP, Photoshop, ImageMagick, every web browser since the mid-1990s, and most industrial software. BMP's universal readability is its main advantage.
- Should I use BMP or PNG?
- Use PNG unless a specific tool requires BMP. PNG is lossless, supports alpha transparency, embeds ICC profiles, and produces files 5–10× smaller than BMP. BMP is only necessary for legacy Win32 apps, embedded firmware, thermal printers, and CNC machines.
- Can I batch convert JPG to BMP?
- Yes. Convertify accepts up to 10 files per batch. Because BMP files are large (a 1080p image is ~6 MB), batch output can be substantial — files are delivered as a ZIP archive with DEFLATE compression for transit.
What happens when you convert JPG to BMP
JPEG stores pixels using 8×8 block DCT compression with quantized coefficients — a lossy process that discards some detail to save space. Converting to BMP reverses the decompression step: each block is decoded into full RGB values and written as raw, uncompressed pixel data. The conversion does not restore detail lost during original JPEG encoding, but it guarantees no additional quality loss occurs. The resulting BMP file is typically 5–15× larger than the source JPG because every pixel occupies 3 bytes (24-bit) or 4 bytes (32-bit) with zero compression.
BMP uses the BITMAPFILEHEADER (14 bytes) followed by a DIB header — most commonly the 40-byte BITMAPINFOHEADER — and then raw pixel rows padded to 4-byte boundaries, stored bottom-up by default. This simplicity is exactly why the format persists: any system with a few hundred lines of C code can parse it without linking compression libraries.
Why convert JPG to BMP — real use cases
The primary reason is compatibility with systems that only accept BMP. Win32 and MFC applications using LoadImage() with IMAGE_BITMAP require BMP input. Industrial HMI software such as Siemens WinCC, Allen-Bradley FactoryTalk, and GE iFIX expects BMP for screen overlays and button graphics. Embedded firmware — boot splash screens, LCD test patterns, thermal printer logos, and CNC machine displays — consumes BMP because the format needs no decompression library.
Other use cases include forensics pipelines requiring hash-stable uncompressed pixels, legacy-to-modern migration workflows where BMP is the intermediate step, and medical imaging equipment that exports via BMP for FDA/CE certification compliance. If your downstream tool doesn't specifically require BMP, consider converting JPG to PNG instead — PNG is also lossless but 5–10× smaller.
JPG artifacts in BMP output
A common misconception is that converting to an uncompressed format somehow improves image quality. It does not. JPEG's lossy compression permanently discards high-frequency detail during encoding — converting to BMP preserves exactly what remains, nothing more. You may notice blocking artifacts (visible 8×8 pixel grids), ringing near high-contrast edges, and color banding in smooth gradients. These are baked into the decoded pixel data and appear identically in the BMP output.
The benefit is different: once in BMP, the image can be processed, cropped, rotated, and re-saved unlimited times without accumulating additional generation loss. Each re-save of a JPG applies another round of DCT quantization — degrading quality progressively. BMP freezes the image at its current quality level permanently.
File size comparison: JPG vs BMP
BMP stores every pixel as raw bytes with no compression. The formula is straightforward: FileSize ≈ width × height × (bitsPerPixel / 8) + 54 bytes header + row padding.
For a typical 1920×1080 photo: JPG at quality 85 weighs roughly 400–800 KB. The same image as 24-bit BMP is 5.93 MB — about 8–15× larger. At 4K resolution (3840×2160), a 24-bit BMP reaches 23.7 MB, and a 32-bit BMP with alpha channel hits 31.6 MB. This size increase is the fundamental trade-off: you gain universal parseability and zero compression overhead at the cost of storage space and transfer time.
BMP bit depth options: 24-bit vs 32-bit
Convertify outputs 24-bit BMP by default using the standard BITMAPINFOHEADER (40 bytes). This is the most universally compatible variant — readable by Windows 3.1 through Windows 11, every version of Linux, macOS Preview, all major image editors, and virtually every embedded BMP parser ever written.
32-bit BMP adds an alpha channel (BGRA, 4 bytes per pixel) using the BITMAPV5HEADER (124 bytes). This matters for Windows 8+ Photos, PowerPoint transparency, and .NET System.Drawing workflows. Since JPG has no transparency, the alpha channel in 32-bit output is set to 255 (fully opaque) for all pixels — useful only if the downstream tool requires 32-bit BMP format specifically.
For animated or indexed-color needs, 8-bit BMP with a 256-color palette is also available, though this quantizes the JPG's 16.7 million colors down to 256.
Embedded systems and industrial workflows
BMP persists in 2026 because embedded devices have strict constraints that rule out compressed formats. A thermal receipt printer (Epson TM-T88, Star TSP100, Zebra ZD series) expects monochrome or 24-bit BMP for logo upload via ESC/POS commands — the firmware contains a BMP parser but no PNG or JPEG decoder. CNC raster engravers (LaserGRBL, LightBurn, Roland CutStudio) accept BMP for raster engraving paths. STM32 and ESP32 microcontroller projects use BMP because adding libpng or libjpeg exceeds the flash budget.
When converting JPG to BMP for these targets, the exact BMP variant matters: 1-bit monochrome for thermal printers, 16-bit RGB565 for LCD frame buffers, 24-bit bottom-up for industrial HMIs. Convertify handles all variants with appropriate dithering for bit-depth reduction.
When to use PNG instead of BMP
For 95% of "I need an uncompressed image" requests, PNG is the better choice. PNG uses lossless DEFLATE compression that produces files 5–10× smaller than BMP for identical pixel data. PNG natively supports full 8-bit alpha transparency, ICC color profiles, and gamma correction — all of which BMP handles poorly or not at all before the V5 header variant.
Convert JPG to BMP only when a specific tool, driver, or firmware explicitly requires the .bmp format. Examples include vendor-locked HMI software, .bmp-only firmware uploaders, Win32 dialog resource editors, and older Visual Basic 6 / Delphi applications whose PictureBox components only load BMP natively.