Convert AVIF to BMP — Free & Private

Does converting AVIF to BMP lose any quality?

The conversion itself doesn't discard anything further, but the result depends on how the AVIF was originally saved. Most AVIF files on the web are saved with lossy compression, which already trimmed some pixel detail at the source. BMP is uncompressed, so it stores whatever pixels it's given exactly — it locks in the AVIF's existing quality level without adding new loss. If your AVIF was saved in lossless mode, the BMP will be a perfect pixel-for-pixel match.

• BMP stores pixels exactly as given — it can't lose more, but can't recover what AVIF already discarded
• A lossy AVIF converted to BMP keeps those same compression artefacts, just uncompressed
• A lossless AVIF converted to BMP is a perfect pixel match
• BMP can't make a lossy AVIF "lossless" — the damage, if any, is already done

Why is the BMP file so much bigger than the AVIF?

AVIF is one of the most efficient image codecs available, often producing files a fraction of the size of older formats at the same resolution. BMP, by contrast, stores almost every pixel with little to no compression. The jump from a tightly compressed AVIF to an essentially uncompressed BMP can mean a 10–20x increase in file size for the same image dimensions — a 200KB AVIF photo might become a 4–6MB BMP.

• AVIF: highly compressed, often the smallest of all common image formats
• BMP: little to no compression — stores pixel data almost raw
• Expect roughly a 10–20x size increase converting AVIF to BMP
• If file size matters, BMP is rarely the right destination format

Will transparent areas in my AVIF survive the conversion to BMP?

Often not reliably. AVIF supports a full alpha channel for smooth transparency and soft edges. While the BMP format technically has a 32-bit variant that can store alpha data, most image viewers, editors, and especially older Windows software either ignore it or render transparent areas as solid black or white. If your AVIF has transparency you need to keep, BMP is not a safe destination — PNG or WebP preserve alpha far more reliably.

• AVIF: full alpha channel transparency, well supported
• BMP: alpha support exists on paper but is unreliable across software
• Transparent areas often become solid white or black after conversion to BMP
• For images with transparency, convert to PNG or WebP instead

Why would anyone convert AVIF to BMP in 2026?

Almost always because of older or specialized software that simply doesn't recognize AVIF at all. Some legacy Windows applications, embedded device firmware, label/thermal printer drivers, and industrial scanning or imaging tools were built around BMP and have never been updated to support modern formats. If a tool you're required to use rejects AVIF outright but accepts BMP, converting is the practical workaround — even though the resulting file is much larger.

• Common case: legacy Windows software or hardware drivers that predate AVIF
• Label printers, embedded systems, and some industrial tools require BMP
• Keep your original AVIF — BMP is a compatibility copy, not a better master
• For everyday use, PNG or WebP cover the same compatibility needs with far smaller files