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Convert BMP to AVIF

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BMP (Windows Bitmap) stores pixels as raw, uncompressed bytes — there is no compression at all. A single 1920×1080 BMP occupies roughly 6 MB regardless of whether the image is a white canvas or a complex photograph. That makes BMP the largest common image format by a significant margin. AVIF applies lossy compression, permanently discarding fine spatial detail the eye barely perceives. At quality settings of 75%+, the difference from the uncompressed BMP is imperceptible in photographs. The size reduction when converting BMP to AVIF is typically 20–50× — among the most dramatic jumps possible between any two image formats.

When you’d want this conversion

  • Reducing massive BMP files before sharing, emailing, or uploading — BMP has no compression
  • Converting Windows screenshots or system-resource graphics exported as BMP
  • Getting the most efficient modern output from an uncompressed BMP in a single step
  • Serving images that originated as BMP on a website or CMS

What to watch for

The lossy encoding is permanent — once converted, the discarded detail cannot be recovered. Keep the original BMP as your master file if you may need to edit it again.
AVIF requires a modern browser to display: Chrome 85+, Firefox 93+, or Safari 16+. For images shared by email or opened in desktop apps, use WebP or JPEG instead.
Encoding takes several seconds — the browser runs the AV1 encoder in WebAssembly. Larger images take proportionally longer.
From.bmp

BMP

Windows Bitmap

  • Lossless compression
  • Supports transparency
  • Best for: Windows system resources, raw pixel exports from graphics tools
To.avif

AVIF

AV1 Image File Format

  • Lossy compression
  • Supports transparency
  • Best for: high-efficiency web images, HDR photography, modern web delivery

More BMP Conversions

Convert BMP to PNG Convert BMP to JPEG Convert BMP to WebP

Convert Other Formats to AVIF

Convert PNG to AVIF Convert JPEG to AVIF Convert WebP to AVIF Convert GIF to AVIF Convert HEIC to AVIF Convert SVG to AVIF

Related Tools

Image to PDF Compress BMP Image Converter

Related Guide

PNG vs JPG vs WebP vs AVIF

How to Use

  1. 1

    Drop your BMP file or click to browse — the output format is already set to AVIF.

  2. 2

    Adjust the quality slider. 75–80% is a good starting point; lower values produce smaller files with more visible compression.

  3. 3

    Click "Convert to AVIF" — conversion runs entirely in your browser. Expect a few extra seconds — AVIF encoding runs in WebAssembly.

  4. 4

    Download the AVIF.

Frequently Asked Questions

How much smaller will the AVIF be compared to the BMP?

Typically 20–50× smaller at equivalent visual quality. BMP stores every pixel as raw bytes with no compression — any format that applies compression produces a dramatic reduction.

Why is BMP so large in the first place?

BMP stores each pixel as raw bytes with no compression applied. A 24-bit BMP at 1920×1080 requires exactly 1,920 × 1,080 × 3 bytes ≈ 6 MB regardless of image content. Every other common image format applies at least some compression to reduce that footprint.

Does converting BMP to AVIF reduce image quality?

AVIF uses lossy compression, so some fine detail is permanently discarded — but at quality settings of 85%+, the difference is imperceptible in photographs and most graphics. For images you plan to edit further, keep the original BMP as your master copy.

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