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Convert BMP to GIF Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your BMP
Click the upload button or drag and drop your BMP file. Upload up to 10 files for batch conversion.
2Choose GIF output
GIF is selected by default on this page. Adjust quality settings if needed.
3Download
Click Convert and download your GIF file. For multiple files you get a ZIP archive.
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
- Does converting BMP to GIF lose quality?
- Yes — GIF's 256-color limit means colors are quantized from 16.7 million to 256. For flat-color graphics with fewer than 256 colors, there is no visible loss. For photos, gradients become banded.
- Why is my GIF file smaller than the BMP?
- GIF uses LZW compression plus color reduction to 256 indexed colors. A 5.93 MB BMP (1080p) typically becomes 200–800 KB as GIF — a 7–30× reduction.
- Can I make an animated GIF from BMP?
- A single BMP converts to a single-frame static GIF. To create animation, upload multiple BMP files as separate frames and Convertify will combine them into an animated GIF with configurable frame delays.
- What dithering method should I use?
- Floyd-Steinberg for photos and gradients (looks smoother). No dithering for logos, icons, and flat graphics (preserves clean edges, smaller files). Ordered/Bayer for retro pixel-art aesthetics.
- Can BMP transparency transfer to GIF?
- Only from 32-bit BMP with alpha channel. GIF supports binary transparency only (fully transparent or fully opaque), so semi-transparent edges become hard-edged.
- Is GIF or PNG better for web graphics?
- PNG — it supports full 24-bit color, 8-bit alpha, and lossless compression with smaller files. GIF is only preferable when animation is needed or when a platform specifically requires .gif format.
- Why does my GIF look grainy after converting from BMP?
- GIF is limited to 256 colors per frame using an 8-bit indexed palette. Your 24-bit BMP has 16.7 million colors (8 bits × 3 channels), so the converter must quantize the palette using algorithms like median cut or octree. This causes visible color banding on photographs and smooth gradients. Dithering (Floyd-Steinberg or ordered) masks the banding but adds a grainy texture. For photographic content, PNG preserves full color losslessly, or WebP gives 25–34% smaller files than JPEG at equal quality.
- Why would I convert BMP to GIF instead of PNG?
- The main reason is animation — GIF supports multi-frame animation natively with per-frame delay times and loop counts via the Netscape Application Extension, while standard PNG does not (APNG exists but has less universal support). GIF also works in every email client, including Outlook desktop which freezes on frame 1 but still displays the image. For static images, PNG is almost always better: 16.7 million colors, full 8-bit alpha transparency, DEFLATE compression producing smaller files, and universal browser support. The only edge case where static GIF wins is tiny flat-color icons — GIF's LZW compression on a 12-color flat icon can produce a 2 KB file while PNG might be 4 KB.
24-bit to 8-bit: the color reduction process
BMP typically stores 16.7 million colors (24-bit RGB, 8 bits per channel). GIF supports exactly 256 colors per frame, stored in an indexed palette. Converting BMP to GIF requires color quantization — selecting the optimal 256 colors from millions and mapping every pixel to its nearest palette entry.
Convertify uses the median cut algorithm by default, which recursively splits the color space along the axis of greatest range to produce a perceptually balanced palette. For photographic BMPs with smooth gradients, this produces visible banding where continuous tones become staircase steps. For flat-color graphics — logos, diagrams, screenshots, pixel art — the result is often visually indistinguishable from the source because these images naturally use fewer than 256 distinct colors.
Dithering: simulating more colors
Dithering scatters differently-colored pixels in patterns that the eye blends into intermediate tones. Convertify supports Floyd-Steinberg error-diffusion dithering (the default for photographic content), ordered Bayer dithering (a regular dot pattern preferred for retro/pixel-art aesthetics), and no dithering (clean flat areas, best for logos and UI elements).
Dithering makes GIF output look better on gradients but increases file size — LZW compression works best on runs of identical pixels, and dithering breaks up those runs. A 500 KB BMP logo with flat colors might compress to a 5 KB GIF without dithering but 15 KB with Floyd-Steinberg. A photographic BMP will produce a large GIF regardless of dithering choice.
Transparency: BMP to GIF
Standard 24-bit BMP has no alpha channel, so there is nothing to transfer. If you have a 32-bit BMP with V5 header alpha, Convertify maps it to GIF's binary transparency: pixels with alpha below 128 become transparent, pixels above become opaque. GIF supports only 1-bit transparency (fully transparent or fully opaque) — semi-transparent edges become jagged.
For BMP images with a known background color, Convertify can designate that color as transparent in the GIF palette. This is common for sprites and icons where a magenta (RGB 255,0,255) background is used as a transparency key.
File size: BMP vs GIF
The file size reduction is dramatic. A 1920×1080 24-bit BMP is 5.93 MB. The same image as a GIF is typically 200–800 KB for photographic content (with quantization artifacts) or 20–100 KB for simple graphics. That is a 7–300× reduction.
GIF uses LZW compression, which excels at images with long runs of identical pixels — flat colors, horizontal lines, simple patterns. Photos with dithering produce larger GIFs because the scattered pixel patterns defeat LZW's run-length detection.
For web-optimized output, consider WebP instead — it supports both lossy and lossless compression with full 24-bit color and transparency, producing smaller files than GIF for the same quality.
When BMP to GIF makes sense
GIF is the right target when you need: (1) universal compatibility across email clients — GIF is the only animated format rendered by Outlook desktop, (2) Discord/Slack/forum emoji and stickers — many platforms require GIF format specifically, (3) simple website graphics where JavaScript-free animation is needed, (4) legacy web content where PNG is unavailable.
For photographic BMP content with more than 256 colors, BMP to JPG produces much better results — JPG preserves all 16.7 million colors with lossy compression, while GIF forces color reduction. For lossless web graphics, BMP to PNG is almost always the better choice.