BMP to WebP Converter

1. Upload one or more BMP files (up to 50 MB total).
2. Click 'Convert to WebP' — finishes in under 2 seconds per image.
3. Download WebP files individually, or grab all as a ZIP.

BMP is uncompressed — a typical BMP file is 20-50x larger than the same image as WebP. Converting BMP to WebP saves 95%+ of storage while preserving visual quality.

BMP is the oldest image format still in use — it stores pixels uncompressed. A single 10 MB BMP photo becomes about 200 KB as WebP, a 95% reduction. If you have a folder of BMP files (from old Windows software, screenshots, or legacy workflows), converting to WebP reclaims enormous storage space and puts the images into a modern, web-compatible format.

The converter reads the uncompressed BMP pixel data and re-encodes it as WebP using libwebp at 85% quality. The output is typically 20-50x smaller than the BMP source. BMP's alpha channel (32-bit BMP only) is preserved as WebP's alpha channel.

• Reclaiming storage from a large BMP archive.
• Converting legacy BMP screenshots for modern websites.
• Preparing BMP images for web delivery (smaller files).
• Optimizing a BMP-heavy asset library for CDN delivery.
• Modernizing legacy BMP images for use in modern web apps.
• Reducing backup size for BMP-heavy folders.
• Preparing BMP images for mobile or bandwidth-limited users.

WebP output uses 85% quality — visually indistinguishable from the BMP source at normal viewing distances. WebP is 25-35% smaller than JPG at the same quality while preserving transparency. Best modern format for converting legacy BMP files for web use.

• WebP is a lossy format — the BMP source is not preserved bit-for-bit.
• Very old software (pre-2015) may not support WebP.
• Animated BMP sequences are rare and use only the first frame.
• Very large BMP files (over 50 MB) are rejected.
• BMP filters or metadata (rare) are not preserved.

• WebP opens natively in every browser since 2020.
• Native support in Windows 10+, macOS Big Sur+, iOS 14+, Android 4+.
• Supported by WordPress 5.8+, Shopify, Squarespace, Wix, Ghost.
• Native import in Photoshop 23+, GIMP 2.10+, Affinity, Figma.
• Ideal for CDN delivery via Cloudflare, CloudFront, Akamai.

• BMP → WebP gives the biggest file size reduction available (95%+).
• WebP preserves BMP transparency if the source was 32-bit.
• For cross-platform destinations, use BMP → JPG instead.
• Batch-convert up to 50 MB at once.
• For lossless output, use BMP → PNG.

WebP file is much smaller than expected

That's the point — BMP → WebP typically reduces file size by 95%+ while preserving visual quality.

WebP won't open in very old software

Software from before 2015 may not support WebP. Convert to JPG if legacy compatibility is required.

BMP transparency is not preserved

Only 32-bit BMP has alpha. If the source was 24-bit, there's no transparency to preserve. Use PNG instead if transparency matters.

• Microsoft — BMP File Format
• Google Developers — WebP