Can I batch convert BMP files?

Yes. Drag & drop multiple BMPs, tweak quality/resize, and download as WEBP (individually or as a ZIP).

Does transparency work with BMP?

Classic BMPs often lack alpha; if your BMP has no transparency it will convert as opaque.

For photos try 70–90. For UI/graphics use higher quality or consider lossless (set quality to 100).

No. Everything runs locally in your browser using HTML Canvas. Nothing leaves your device.

Drop your .bmp files, adjust quality, and convert entirely in your browser. We don't upload or store your images.

Need a different converter?

Drag & drop BMPs here

or click to browse. Max recommended ~50MB each.

Stability note: We process up to 20 images at a time for reliability. Large batches split automatically.

Quality: 80

Higher = bigger file, lower = smaller file.

Width (px)

Height (px)

Lock aspect ratio

When unlocked: Fit Fill/Crop

Aspect locked: scale to fit. Unlocked + Fill/Crop: render exact size and crop overflow from center.

BMP files are uncompressed and huge. WEBP offers excellent compression (and supports transparency) while keeping great visual quality.

Do you upload or store my images?

No—everything happens in your browser with Canvas.

Will transparency be preserved?

If your BMP has an alpha channel, we preserve it in WEBP.