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Convert GIF to BMP Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your GIF
Drag and drop your GIF or click to browse. Up to 10 files supported for batch conversion.
2Choose frame (optional)
Select the first frame (default) or specify any frame number to extract.
3Download BMP
Download your 24-bit BMP file. Transparent areas are filled with white. File is deleted immediately after download.
Supported Image Formats
GIF
Classic format for simple animations. Supports transparency and up to 256 colors.
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.
JPG
Universal format for photos. Supported everywhere, great balance between quality and file size.
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
- Why would I convert GIF to BMP?
- BMP is required by legacy Windows applications (Win32/GDI, VB6, MFC), industrial automation software (Siemens WinCC, Allen-Bradley FactoryTalk), embedded systems with LCD or e-paper displays, ESC/POS thermal printers, CNC and laser engraving machines, and medical imaging tools that accept only uncompressed bitmap input.
- Why is my BMP so much larger than the GIF?
- BMP-24 stores every pixel as 3 raw uncompressed bytes (width x height x 3 + 54-byte header), regardless of image content. GIF compresses the same pixel data with LZW. A 200 KB GIF can become a 6 MB BMP — that is normal and expected. If file size matters, use PNG instead; it is lossless and typically 5-10x smaller than BMP.
- Does GIF to BMP preserve transparency?
- In 24-bit BMP (default): no. Transparent pixels are filled with white. In 32-bit BMP with BITMAPV5HEADER (?bpp=32): yes — transparent GIF pixels become alpha=0, opaque pixels become alpha=255. 32-bit with V5 header is required for transparency in Windows Photos, PowerPoint, and .NET applications.
- Does GIF to BMP preserve animation?
- No. BMP is a single-frame format with no concept of multiple frames, delay times, or loop counts. Only the first frame is extracted by default. Use ?frame=N (zero-indexed) to extract a specific frame, or ?frames=all to get every frame as separate BMP files in a ZIP archive.
- What BMP bit depth does Convertify output?
- 24-bit (BITMAPINFOHEADER, BI_RGB) by default — the most universally compatible variant, readable by every Windows application, GIMP, LibreOffice, and most embedded parsers. Other options: ?bpp=32 (BITMAPV5HEADER with alpha), ?bpp=8 (grayscale, for engravers and legacy tools), ?bpp=1 (monochrome with Floyd-Steinberg dithering, for thermal printers).
- Should I use BMP or PNG after converting from GIF?
- PNG unless a specific downstream tool explicitly requires BMP. PNG is lossless like BMP, supports full alpha, is typically 5-10x smaller, and is universally supported. Use BMP only when a Win32/GDI application, embedded firmware, industrial HMI, thermal printer, or CNC machine documents BMP as its required input format.
- Can I batch convert multiple GIF files to BMP?
- Yes. Convertify's batch endpoint accepts up to 100 GIF files per request, processes them in parallel, and returns a ZIP archive. Because BMP files are uncompressed and large, the ZIP layer applies DEFLATE compression to the archive, which recovers most of the file-size penalty for transit.
- Do browsers display BMP files?
- Yes — Chrome, Firefox, Safari, and Edge all render BMP in <img> tags natively. However, BMP is not recommended for web use because file sizes are 10-20x larger than equivalent JPG or PNG. Use PNG or WebP for web images.
When you need to convert GIF to BMP
BMP (Device-Independent Bitmap) is the native raster format for Microsoft Windows GDI, defined since Windows 3.0 (1990). Most modern workflows have no reason to use BMP — but several specific contexts require it. Win32/MFC/VB6 applications load bitmaps via LoadImage() with IMAGE_BITMAP and expect .bmp files. Older image processing pipelines (medical imaging, industrial machine vision, legacy CAD) often only accept BMP input. Embedded systems with simple display controllers read BMP directly because its header is trivial to parse and pixels are stored uncompressed in scanline order. Some ESC/POS receipt printers and Waveshare e-paper displays require 24-bit or 1-bit BMP for logo upload. For all these cases, converting a GIF frame to BMP provides raw pixel data the target can consume without a graphics library.
What happens when you convert GIF to BMP
GIF uses an 8-bit indexed palette with LZW compression. BMP-24 stores raw BGR pixels (BMP uses Blue-Green-Red byte order, not RGB) with no compression, with rows padded to 4-byte DWORD boundaries. The conversion expands each GIF palette index to its full 24-bit RGB triple. Transparency: GIF's transparent palette index becomes opaque in 24-bit BMP, filled with white by default. 32-bit BMP with BITMAPV5HEADER preserves the GIF's binary transparency as alpha=0 pixels (use ?bpp=32). Animation: BMP is a single-frame format. Only the first frame is extracted; specify ?frame=N to extract any frame. Pixel byte order: BMP stores rows bottom-up by default; Convertify writes bottom-up 24-bit BMPs for maximum Win32 GDI compatibility.
GIF vs BMP — technical comparison
| Feature | GIF | BMP |
|---|---|---|
| Color depth | 256 colors (8-bit indexed) | 1, 4, 8, 24, or 32-bit — 24-bit = 16.7M colors |
| Compression | LZW lossless | None (raw pixels) — or RLE4/RLE8 |
| Transparency | 1-bit binary | Not in 24-bit — 32-bit needs V5 header |
| Animation | Yes, multi-frame | No — single frame only |
| File size (1080p) | ~200–500 KB | ~6 MB (uncompressed 24-bit) |
| Platform support | All browsers, all OS | Native Windows; needs library on macOS/Linux |
| Best for | Web, animation, compatibility | Win32/GDI, embedded systems, legacy tools |
BMP file size — what to expect
BMP-24 is uncompressed. File size is deterministic: width x height x 3 bytes, rounded up to 4-byte row alignment, plus a 54-byte header. A 640x480 GIF converting to 24-bit BMP produces exactly 921,654 bytes (~900 KB). A 1280x720 GIF becomes 2,764,854 bytes (~2.6 MB). A 1920x1080 frame becomes 6,220,854 bytes (~5.9 MB). These are dramatically larger than the source GIF — a 200 KB animated GIF of a 640x480 clip becomes a ~900 KB BMP of just its first frame. BMP-32 (with alpha) adds 33% more: 1920x1080 becomes 8.3 MB. PNG-24 of the same first frame is typically 5-10x smaller than BMP while remaining lossless. If file size matters, use PNG.
GIF to BMP for embedded systems and industrial workflows
Embedded BMP consumers have stricter requirements than desktop viewers — conversion is about hitting the exact BMP variant the firmware expects. Thermal receipt printers (Epson TM-T88, Star TSP100): expect 1-bit monochrome BMP, bottom-up, BITMAPINFOHEADER, fixed width (usually 384 or 576 pixels). Use ?bpp=1&dither=floyd-steinberg. CNC raster engravers (LaserGRBL, LightBurn): expect 8-bit grayscale BMP, top-down. Use ?bpp=8&grayscale=true. LCD splash screens (STM32 LTDC, ESP32 LovyanGFX): often expect 16-bit RGB565 BMP using BI_BITFIELDS. Industrial HMI suites (Siemens WinCC, Allen-Bradley FactoryTalk): expect 24-bit BMP with BITMAPINFOHEADER and bottom-up rows — Convertify's default. CNC machines and laser cutters (Mach3, Roland CutStudio): accept 24-bit BMP for raster toolpath generation from GIF logos and artwork.
Alternatives to BMP for legacy workflows
If your workflow accepts PNG, use PNG instead of BMP — PNG-24 is lossless, often 5-10x smaller, supports full alpha, and is universally supported. Use BMP only when a specific tool explicitly requires it. For 1-bit monochrome BMP (thermal printers): Convertify supports ?bpp=1&dither=floyd-steinberg. For 8-bit grayscale (engravers): ?bpp=8&grayscale=true. For maximum compatibility with very old Windows tools (Windows 3.1 era), avoid BITMAPV4/V5 headers — Convertify's 24-bit default writes BITMAPINFOHEADER only, the most universally readable DIB header variant.
How Convertify converts GIF to BMP
Convertify uses Rust + libvips for GIF to BMP conversion. libvips decodes the requested GIF frame via libnsgif, expands the indexed palette to 24-bit RGB, and flattens any transparency to white (since BMP-24 has no alpha channel) via vips_flatten(). The BMP file is written with a standard 54-byte header (BITMAPFILEHEADER + BITMAPINFOHEADER) followed by uncompressed BGR scanlines padded to DWORD boundaries. Output is always BI_RGB (no compression) for maximum compatibility with every Windows application, GIMP, LibreOffice, and ImageMagick. For 32-bit output (?bpp=32), Convertify writes a 124-byte BITMAPV5HEADER with explicit alpha mask declarations, enabling proper transparency in Windows Photos, PowerPoint, and .NET System.Drawing. All processing is in-memory; no temporary files are written to disk.