BMP to WebP Converter: Free, Private, No Upload

Convert BMP files to WebP in your browser. Smaller output file, batch up to 20 files at once, no upload, no account, no watermark. Your files never leave your device.

BMP to WebP
Batch up to 20 files
No upload, no account
Metadata stripped

1Add up to 20 images
2Pick from 18 formats
3Download or copy the code

Processed on your device. Your images are never uploaded, and metadata is stripped. How we keep it private

How do I convert BMP to WebP for free?

Drop your BMP files into the tool above, choose WebP as output, and download the result. Everything runs in your browser, so nothing is uploaded and there is no limit or watermark. It works on Windows, Mac, Linux, ChromeOS, iOS and Android — anywhere you have a modern browser.

Price: Free, no credits and no daily cap
Account required: No
File uploaded to server: No, processed locally in your browser
Batch limit: Up to 20 files at once
Input format: BMP
Output format: WebP
Best for: WebP workflows, smaller files, faster sharing
Works on: Chrome, Edge, Firefox, Safari, iOS and Android browsers
Privacy: No upload, no tracking, metadata stripped
Output quality: Adjustable 1-100, defaults to 90

How to convert BMP to WebP

1
Drop your BMP files
Drag up to 20 BMP files onto the page or click to choose them. Everything runs in your browser.
2
WebP is preselected
Output is already set to WebP. Adjust quality, resize or batch if you want.
3
Download
Save each WebP, or download all of them together as a ZIP.

BMP to WebP: what changes and when it makes sense

BMP is a Bitmap image format. It is best known for a simple structure that legacy programs and embedded systems can read without a decoder library. The main drawbacks are enormous files and no reliable transparency.

WebP is a WebP format, developed by Google. It is best known for smaller files than JPG and PNG at similar quality, with transparency and animation in one format. The main drawbacks are rejection by some upload forms, older editors and email clients, and no wide-gamut or HDR support.

BMP vs WebP at a glance

Property	BMP	WebP
Type	Raster image	Raster image
Compression	Usually uncompressed (run-length encoding exists but is rare)	Lossy (VP8) or lossless, chosen per file
Transparency	None	Full alpha channel with soft edges
Animation	No	Yes
Colour depth	1 to 32 bits per pixel	8 bits per channel
Support	Opens in browsers and most desktop software, but almost never used on the web	Supported by current Chrome, Edge, Firefox, Safari and Opera, but not by every older editor, office suite or upload form
History	Created by Microsoft for Windows 1.0 in 1985 as the native bitmap format for the Windows Graphics Device Interface. The "BM" signature has been unchanged since then. Still used in embedded systems and legacy Windows software.	Announced by Google in September 2010, based on the VP8 codec acquired with On2 Technologies. First format to combine lossy, lossless, alpha and animation in one specification. Safari support arrived in 2020 with macOS 11.

What actually changes in this conversion

Moving from a lossless format to WebP is where you trade fidelity for size. Start high and lower until the difference becomes visible.
BMP has no alpha channel, so every pixel is already opaque.
Expect the WebP file to be far smaller than the BMP source.
EXIF, GPS and camera data are stripped on every conversion. That is good for privacy, but you lose capture dates.

About BMP: history and technical details

Created by Microsoft for Windows 1.0 in 1985 as the native bitmap format for the Windows Graphics Device Interface. The "BM" signature has been unchanged since then. Still used in embedded systems and legacy Windows software.

Technical: File header 14 bytes (signature, size, reserved, offset) followed by DIB header (40+ bytes). Supports 1, 4, 8, 16, 24, 32-bit pixels. Rows padded to 4-byte boundaries. Pixels can be stored bottom-up or top-down. Optional RLE4/RLE8 rarely used.

Real-world size: A 12-megapixel photo is 36 MB as 24-bit BMP. As JPG it is 2-4 MB (90% smaller). A 1920x1080 screen at 32-bit BMP is 8.3 MB; as PNG 200-600 KB.

Popular tools: Windows Paint, IrfanView, XnView, ImageMagick, GIMP, Adobe Photoshop, embedded dev tools.

Alternatives: PNG (lossless, 5-20x smaller), TGA (game pipelines), TIFF (professional print), JPG (lossy, much smaller).

About WebP: what you get

Announced by Google in September 2010, based on the VP8 codec acquired with On2 Technologies. First format to combine lossy, lossless, alpha and animation in one specification. Safari support arrived in 2020 with macOS 11.

Technical: Lossy WebP uses VP8 intra-frame coding with 4x4 and 16x16 block prediction. Lossless WebP uses a new algorithm with colour cache and LZ77 backward references. Max dimensions 16,383 by 16,383.

Real-world size: Lossy WebP at quality 80 is typically 25-35% smaller than JPG at quality 85 for photographs. Lossless WebP is 20-30% smaller than PNG for graphics. Google reports 80% savings on some assets after switching to WebP.

Popular tools: Google Chrome (built-in encoder), cwebp, Squoosh, ImageMagick, Adobe Photoshop 2020+, Figma, WordPress (via plugin).

Alternatives: AVIF (30-50% smaller but slower to encode), JPG (universally accepted), PNG (lossless), HEIC (Apple ecosystem).

Browser and software compatibility

BMP: Opens in browsers and most desktop software, but almost never used on the web. WebP: Supported by current Chrome, Edge, Firefox, Safari and Opera, but not by every older editor, office suite or upload form.

WebP is well supported by current browsers but still gets rejected by some editors and upload forms.

Why people move away from BMP

A 12 megapixel photo saved as 24-bit BMP is roughly 36 MB because pixels are stored almost raw.
BMP has no practical support for transparency, and almost no web workflow expects it.

Why people choose WebP

Lossy WebP is commonly 25 to 35 percent smaller than JPG at similar visual quality, which helps Core Web Vitals.
One format covers photographs, transparent graphics and short animations.
Lighthouse and other performance audits recommend modern formats like WebP.

Common mistakes with BMP

Using BMP on web pages — files are 10-20x larger than PNG with zero benefit
Expecting BMP transparency to work — most viewers ignore the alpha channel
Converting large BMPs without checking disk space — can fill your drive

Best practices for keeping quality

BMP is raw pixels, so the source has no compression damage. Convert at full size and choose the output quality freely.
Quality 75-85 is a good default for photographs. Use lossless WebP for screenshots and interface graphics.
If you serve visitors on very old browsers, test there and keep a JPG or PNG fallback.
Resize before converting if the image will be shown small. A 4000 pixel photo displayed at 800 pixels wastes bytes in any format.
Check the result at 100 percent zoom, especially around text, edges and gradients, before you replace any originals.
Keep your original files. Conversions to a lossy format cannot be undone.
When you convert a set of images, use the same quality setting for the whole batch. The converter handles up to 20 files at once.

BMP to WebP questions

Quick answers about privacy, quality, supported formats, file limits and how WebP works.

Why convert BMP to WebP?

WebP files are typically smaller than BMP, which makes them faster to share, send and load. The trade-off is a small amount of image detail at low quality settings.

Will converting BMP to WebP lose quality?

At 90% quality, most people cannot tell the difference. Use 85-95% for photos and you are fine.

Does WebP keep transparency?

Yes. WebP supports full transparency, so transparent areas in your original are kept.

Are my files uploaded?

Never. Everything runs in your browser. Your files never leave your device. Open DevTools Network tab while processing — you will see no upload request.

Can I convert many files at once?

Yes, up to 20 files at once. Download them individually or all together as a ZIP.

Does the converter strip metadata?

Yes. Browsers do not pass EXIF data through a canvas, so GPS, camera model and dates are removed on every conversion. That is good for privacy.

Is it free?

Yes. No credits, no daily cap, no account, no watermark. The practical limit is your device memory.

Is WebP better than JPG?

For web delivery, yes. WebP is 25-35% smaller than JPG at similar visual quality and supports transparency and animation. JPG is still better for universal compatibility with older software.

Can WebP be animated?

Yes. Animated WebP is supported in all modern browsers and produces smaller files than animated GIF. It is one of three web formats supporting animation (GIF, WebP, AVIF).

Does WebP support transparency?

Yes. WebP supports full alpha transparency, including soft shadows and anti-aliased edges, in both lossy and lossless modes.

Your files never leave your device

No upload, no account, no tracking. Everything happens in your browser using the Canvas API and WebAssembly. You can confirm this in your browser's DevTools Network tab while the tool runs — no request carries your file. See why ToolDeck is different.