Image Format Converter
Convert images to PNG, JPEG, WebP or BMP in bulk online. Everything is processed locally in your browser with no upload.
FreeOnline Tool
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How to Use
- Click the upload area to choose images, or drag several onto the page; batch upload is supported.
- Pick the format you want in the "Target format" dropdown: PNG, JPEG, WebP or BMP.
- When JPEG or WebP is selected, drag the "Quality" slider to control how much compression is applied.
- All images are re-converted automatically whenever you change a setting, and the list shows the resulting file size for each one.
- Click "Download" on a single image to save it on its own, or "Download all as ZIP" to get every converted file at once.
Click "Load sample images" to try batch conversion straight away without preparing your own files.
Features
- Batch conversion: drop in several images at once, choose one target format for all of them, and add or remove files at any time.
- Four target formats: PNG, JPEG, WebP and BMP. BMP is written by the tool itself as a standard 24-bit bitmap, because browser Canvas cannot export BMP natively.
- Automatic transparency handling: when converting to JPEG or BMP, which have no alpha channel, transparent areas are filled with white instead of turning black.
- Adjustable quality: JPEG and WebP support a 10%-100% quality slider.
- ZIP download: a built-in front-end ZIP packer downloads every converted image in one click.
- Local processing: conversion happens entirely inside the browser and files are never uploaded, so your privacy is preserved.
Use Cases
PNG to JPEG for smaller files
Batch-convert PNG screenshots that do not need transparency into JPEG to cut their file size substantially.
Converting to WebP for the web
Turn design assets into WebP in bulk so pages load images faster.
Producing BMP for legacy software
Some older applications and embedded devices only read BMP, so convert common formats into a standard bitmap for them.
Standardizing a mixed asset library
Convert images collected from different sources and in different formats into one consistent target format for easier archiving and reuse.
FAQ
Which input formats are supported?
Any image format your browser can decode and display, such as PNG, JPG, WebP, GIF, BMP and SVG, can be uploaded and converted. If the browser cannot parse a particular file, for example HEIC in browsers that lack support, that row shows a conversion failure message.
Where did the transparent background go after converting to BMP?
A 24-bit standard BMP has no alpha channel, so transparent areas are filled with white during conversion. That is a limitation of the BMP format itself rather than a bug in the tool.
Does converting reduce image quality?
Converting to JPEG or WebP with the quality slider below 100% applies some lossy compression. Converting to PNG or BMP is lossless, so the conversion itself costs no quality.
Are my images uploaded to a server?
No. All conversion is done locally in your browser with Canvas, and no image is ever uploaded anywhere.