Is this BMP to AVIF converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple BMP files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

Will the image quality change after conversion?

It depends on the formats involved. Converting to a lossless format like PNG preserves every pixel exactly. Converting to a lossy format like JPEG or WebP applies compression — we default to 85% quality, which looks identical to the original for almost all images. You won't notice a difference unless you zoom in pixel-by-pixel.

Do you support batch image conversion?

Yes — drop multiple images at once and they all convert in parallel. Free accounts handle up to 5 at a time; Pro is unlimited. Download everything as a single ZIP when you're done.

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

Dramatically smaller — a 30 MB BMP typically compresses to under 1 MB as AVIF at high quality. AVIF's compression efficiency is among the best of any image format available today.

Is BMP to AVIF lossless?

The default output is lossy AVIF, which looks visually lossless at quality 80+. If you need strict pixel-perfect output, note that lossless AVIF mode produces much larger files than lossy but still far smaller than BMP.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

BMP to AVIF Converter — Free, Online, No Upload

How to convert BMP to AVIF online

1
Drop your BMP file
Drag and drop your Bitmap Image File file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Bitmap Image File → AV1 Image File Format entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your AVIF
Your AV1 Image File Format file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

BMP vs AVIF: format overview

BMP

Bitmap Image File

Microsoft · 1987

Compression: none
Transparency: No

✓ No compression — original pixel data preserved
✓ Universal Windows support
✗ No compression = massive files

AVIF

AV1 Image File Format

Alliance for Open Media · 2019

Compression: lossy
Color depth: 12-bit
Transparency: Yes

✓ Smallest file size of any image format (50% smaller than WebP)
✓ Excellent HDR and wide-gamut color support

BMP magic bytes: 42 4D

AVIF magic bytes: 00 00 00 .. 66 74 79 70 61 76 69 66

Why convert BMP to AVIF?

BMP files store images as raw, uncompressed pixel data — which means they can be enormous. A single screenshot or scanned image saved as BMP can be 10, 20, or even 50 MB. That's fine for local storage on a workstation, but impractical for anything involving web delivery, email attachments, or cloud storage.

AVIF achieves compression ratios that dramatically reduce file size without visible quality loss. A 20 MB BMP can become a 500 KB AVIF at high quality — a 40:1 reduction. AVIF is supported in all modern browsers and is increasingly accepted by web platforms, CDNs, and image optimization services. If you're taking BMP files out of a local workflow and putting them on the web or into a modern application, AVIF is the best format in terms of quality per byte.

The conversion from BMP to AVIF is straightforward — BMP is lossless and uncompressed, so the AVIF encoder starts from a perfect source. The quality of the AVIF output depends on the quality setting you choose: high quality settings preserve fine detail at moderate file sizes, while lower settings sacrifice some sharpness for smaller files. For web use, a quality setting of 70–80% (out of 100) typically produces visually indistinguishable results from the original at a fraction of the size.

Quality & file size: BMP to AVIF

Typical file sizes: BMP 35–40 MB → AVIF 0.8–2 MB.

Both BMP and AVIF use lossy compression. We transcode at high quality settings (equivalent to AVIF's recommended web quality) to minimize generational loss.

Color depth: BMP supports standard color, AVIF supports 12-bit.

Transparency: BMP does not support transparency. AVIF preserves transparency.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your BMPfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.