Is this BMP to WEBP 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.

My design software only exports BMP — can I use it on a website after converting?

Absolutely. Converting BMP to WebP makes it web-ready: all major browsers support WebP, and the file size will be a fraction of the BMP's size, dramatically improving page load speed.

Does WebP support the transparency that BMP lacks?

BMP does support 32-bit colour with alpha. If your BMP has transparency, WebP will preserve it. If your BMP is a standard 24-bit file, transparency is not applicable.

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 WebP Converter — Free, Online, No Upload

How to convert BMP to WEBP 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 → Web Picture Format entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your WEBP
Your Web Picture 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 WEBP: 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

WEBP

Web Picture Format

Google (On2 Technologies acquisition) · 2010

Compression: hybrid
Color depth: 8-bit
Transparency: Yes

✓ 30% smaller than JPEG, 26% smaller than PNG
✓ Supports both lossy and lossless

BMP magic bytes: 42 4D

WEBP magic bytes: 52 49 46 46 xx xx xx xx 57 45 42 50

Why convert BMP to WEBP?

BMP files are large by design — they store every pixel without compression. This makes BMP reliable for local applications and software compatibility, but impractical for anything involving web delivery or bandwidth-conscious storage. A 15 MB BMP screenshot or graphic is simply too large to handle efficiently on the web.

WebP is Google's image format designed specifically for web use, and it excels at reducing file sizes. Converting BMP to WebP typically reduces file size by 70–90% while maintaining excellent visual quality. WebP is supported in all modern browsers and is accepted by most web platforms, CMS systems like WordPress, and tools like Figma and Canva. Google PageSpeed Insights recommends WebP over older formats for web performance.

Because BMP is uncompressed, the WebP encoder starts from a perfect, lossless source — no pre-existing compression artifacts to work around. For graphics with flat colors and sharp edges (screenshots, diagrams, UI mockups), WebP's lossless mode preserves the exact pixels at a fraction of BMP's file size. For photographic BMP files, lossy WebP at high quality settings achieves similar results to lossless at much smaller file sizes. Transparency in BMP (32-bit BMP with alpha) converts cleanly to WebP's alpha channel support.

Quality & file size: BMP to WEBP

Typical file sizes: BMP 35–40 MB → WEBP 1–3 MB.

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

Color depth: BMP supports standard color, WEBP supports 8-bit.

Transparency: BMP does not support transparency. WEBP 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.