Image Format Converter
Convert images between PNG, JPG, WEBP, and BMP formats online for free. Batch convert multiple files with adjustable quality. No upload needed.
About This Tool
Image Format Converter transforms images between PNG, JPEG, WebP, and GIF formats with a single click. Choose the output format, adjust quality for lossy formats, and download instantly — perfect for web developers optimizing assets, designers delivering client files, and anyone needing quick format changes.
Drag & drop images or click to upload (multiple files)
JPG, PNG, WEBP, BMP, GIF
All processing happens in your browser. Your images are never uploaded to any server.
How to Use
- Upload images by dragging or clicking the upload area (multiple files supported).
- Select the desired output format (JPG, PNG, WEBP, BMP).
- If you chose JPG or WEBP, adjust the quality slider.
- Click the Convert All button.
- Download converted files individually or all at once.
Frequently Asked Questions
Which format should I use?
Use JPG for photos, PNG for images requiring transparency, WEBP for web optimization with smaller file sizes, and BMP for uncompressed raw images.
Is quality lost during conversion?
JPG and WEBP are lossy formats — use the quality slider to balance size and quality. PNG is lossless with no quality loss. BMP is uncompressed, so no loss either.
How many files can I convert at once?
There is no hard limit. It depends on your browser's available memory. Typically you can convert dozens of images simultaneously.
Is it safe?
Yes. All processing happens in your browser using the Canvas API. Your images are never uploaded to any server.
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How It Works
The source image is loaded into the browser using the FileReader API and rendered on an HTML5 Canvas. To convert formats, the Canvas API's toBlob() or toDataURL() method is called with the target MIME type (image/png, image/jpeg, image/webp). For JPEG and WebP, a quality parameter controls lossy compression. GIF output is handled by a JavaScript-based GIF encoder that reads pixel data from the canvas via getImageData(). The resulting file is offered for download through a dynamically created Blob URL.
The entire conversion pipeline runs in your browser using the Canvas API and File API. No image data is uploaded to any server — your files remain 100% private.
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