BMP → AVIF
Shrink huge BMP bitmaps into tiny AVIF files without leaving your browser.
Drop files here
or browse from your device
images · audio · video · documents · archives · up to ~500MB
Your first conversion lands here automatically — saved on this device only, never uploaded.
100% Private
Runs in your browser. No upload.
Instant
No queue, no server roundtrip.
Offline-ready
Works after first load.
Switching a BMP image to AVIF is usually about where it has to work rather than how it looks: one format is accepted, smaller or sharper in the place the picture is heading. AVIF (AV1 Image File Format) earns its place here: best-in-class compression, wide colour and HDR support, transparency included. BMP stores raw, uncompressed pixels. It came from early Windows and still turns up in legacy tools, medical software and embedded systems — always at enormous file sizes.
BMP stores raw, uncompressed pixels. It came from early Windows and still turns up in legacy tools, medical software and embedded systems — always at enormous file sizes.
Converting BMP to AVIF re-encodes the picture: dimensions and visible content stay the same, while file size and colour handling follow the AVIF encoder. Detail already discarded by earlier lossy compression cannot come back, so AVIF preserves what is there rather than restoring what is gone. Transparency survives only if AVIF supports an alpha channel.
What you gain with AVIF: Best-in-class compression, wide colour and HDR support, transparency included.
Drop your BMP file above and Morphio decodes it locally, then re-encodes it as AVIF using WebAssembly + the browser's native codecs. Nothing is ever uploaded — your files stay on your device. Batch as many files as your machine can handle. See exactly how in-browser conversion works.
Open the BMP to AVIF page, drop your image on the drop zone and press convert. Morphio runs an in-browser image pipeline built on Canvas and WebAssembly codecs, so the BMP data never leaves your device and no server ever receives a copy.
Colour profile and pixel dimensions are preserved; you choose the quality level before the file is written. Converting BMP to AVIF only rewrites the container and encoding you asked for — the source file on your disk is never modified.
Yes. The free plan covers 10 conversions a day with files up to 200 MB and adds no watermark or sign-up. Morphio Pro ($5/month, or $29 once for lifetime access) removes the daily cap and raises the per-file limit to 5 GB.
Morphio decodes the BMP file at full fidelity and re-encodes it at a high-quality AVIF setting, so the difference is normally invisible or inaudible. What conversion cannot do is recover detail the original BMP file already threw away.
Yes — drop the whole batch in and each file is processed in turn on your own machine. The practical limit is your device's memory and patience, not a server quota, because nothing is queued anywhere else.
No. The conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can disconnect from the internet after the page loads and it still works.