Image Converter
Convert PNG, JPEG, WebP, GIF, SVG, and BMP images directly in your browser. Switch to modern web formats, preserve alpha transparency, or customize background fills.
How to use
Click Select image, drag and drop an image file into the dropzone, or click Try an example.
Choose your desired output format: WebP, JPEG, or PNG.
Adjust the conversion quality slider for WebP or JPEG outputs (default is 90%).
For JPEG conversions of transparent PNGs, choose an optional background fill color to prevent black borders.
Click Download to save your newly converted image or Copy Base64 to copy its data URI.
Why format conversion matters for websites and applications
Choosing the correct image format directly influences website rendering speed, bandwidth costs, and search engine rankings. Modern web standards like WebP offer superior compression algorithms compared to legacy formats, reducing payload sizes without degrading visual fidelity. When building high-traffic web applications, converting static assets from heavy formats like PNG or unoptimized JPEG into streamlined WebP files helps meet Google Core Web Vitals criteria and improves mobile user experiences.
Comparing WebP, JPEG, and PNG formats
Each format serves distinct graphical use cases:
- WebP: The recommended standard for modern web development. It supports both lossy and lossless compression as well as full alpha transparency. WebP files are typically 25% to 35% smaller than comparable JPEGs and dramatically lighter than transparent PNGs.
- JPEG: The universal format for photography and continuous-tone scenes. JPEG excels at handling complex color gradients and photorealistic textures, though it does not support transparency.
- PNG: The industry standard for lossless line art, UI icons, diagrams, and graphics that require pixel-perfect edges and sharp contrast. However, high-resolution PNGs can become excessively heavy for mobile distribution.
Handling transparency when converting to JPEG
A common pitfall when converting transparent PNG or WebP files to JPEG is the appearance of ugly black backgrounds around silhouettes and text. Because JPEG does not support an alpha transparency channel, transparent pixels default to black in standard graphics software. This tool provides an integrated background color picker that automatically composite transparent regions against clean white or your chosen brand color prior to JPEG encoding.
Lossless vs lossy conversion trade-offs
When converting to PNG, all pixel data is preserved losslessly. When converting to WebP or JPEG, you can finely calibrate the quality setting between 10% and 100%. For most photographic and marketing graphics, a quality range between 85% and 92% is indistinguishable from the uncompressed source while shedding unnecessary file weight.
Secure, client-side processing
Your photos, proprietary UI mockups, and confidential documents never leave your computer. Traditional online converters upload your media to third-party cloud servers or batch processing queues, creating privacy and compliance vulnerabilities. This converter operates entirely inside your local browser sandbox using HTML5 Canvas. Your files are encoded directly in your device's memory and are never transmitted over the network.
Frequently asked questions
Does this tool upload my images to any server?
No. All conversion operations execute entirely within your browser using the HTML5 Canvas API. Your image data never leaves your device.
What happens to transparency when converting a PNG to JPEG?
JPEG files do not support transparency. To prevent transparent areas from turning black, this tool automatically fills transparent sections with your selected background color (white by default).
Which image formats can I convert?
You can upload PNG, JPEG, WebP, GIF, SVG, and BMP files. The tool outputs optimized WebP, JPEG, or PNG images.
Why should I convert my images to WebP?
WebP produces files that are 25% to 35% smaller than equivalent JPEGs while supporting transparency like PNG. All modern desktop and mobile browsers natively support WebP.
Is there a limit on image dimensions or file size?
The converter supports image files up to 25 MB and dimensions up to 8192 px, ensuring safe in-browser canvas memory allocation.