What this tool does
The Image Format Converter lets you switch image files between the 8 most widely used image formats on the web: PNG, JPEG, WebP, AVIF, GIF, SVG, ICO, and BMP. Upload any image and convert it to your desired format with a single click. For lossy formats like JPEG, WebP, and AVIF, you can adjust the quality level to balance file size against visual fidelity. All processing happens locally in your browser. No files are uploaded to any server.
Supported formats
PNG (Portable Network Graphics) is a lossless format ideal for graphics, logos, and images that need transparency. JPEG is the standard for photographs, offering adjustable lossy compression. WebP is Google's modern format that delivers roughly 25-35% smaller files than JPEG and PNG while supporting both lossy and lossless compression plus transparency. AVIF is the newest format based on AV1, often achieving 50% smaller file sizes than JPEG with excellent quality. GIF supports simple animations and is limited to 256 colors per frame. SVG is a vector format best for icons and illustrations that scale without quality loss. ICO is used for website favicons and application icons. BMP is an uncompressed bitmap format that preserves every pixel exactly as-is.
How it works
The tool loads your image into the browser's canvas element, which decodes the pixel data regardless of the source format. For output formats supported natively by the browser (PNG, JPEG, WebP, AVIF), it uses the Canvas API's built-in encoding. For GIF output, the tool quantizes colors down to 256 entries using a popularity-based palette and applies LZW compression. BMP output writes raw pixel data in the standard bitmap format. ICO output wraps a PNG inside the ICO container format, automatically scaling images larger than 256 pixels. SVG output embeds the raster image as base64 data inside an SVG wrapper. For formats that do not support transparency (JPEG, BMP), the tool composites the image onto a white background.
Who should use this
Web developers optimizing images for faster page loads will find the WebP and AVIF options valuable. Graphic designers who need specific formats for different platforms can convert between any of the 8 formats. Anyone creating a favicon can convert directly to ICO. Photographers can export from PNG to JPEG for sharing, or convert older BMP and GIF files to modern formats for better compression.
Limitations
AVIF encoding support depends on your browser. Chrome 121+ supports it natively, while other browsers may not. Converting a raster image to SVG embeds the raster data inside an SVG wrapper rather than performing true vectorization. GIF output is limited to 256 colors, so photographic images may show banding. ICO output automatically scales images larger than 256 pixels to fit the format's size limit. Converting from a lossy format (like JPEG) to a lossless one (like PNG) preserves the image exactly as decoded but cannot recover quality lost during the original compression.
FAQs
Q: Does converting JPEG to PNG improve quality? A: No. Converting a lossy format to a lossless one preserves the decoded pixels exactly, but cannot recover detail lost during the original JPEG compression. The file will likely be larger.
Q: Which format gives the smallest file size? A: AVIF typically produces the smallest files for photographs, followed by WebP, then JPEG. For simple graphics with few colors, PNG can sometimes be smaller than lossy formats.
Q: Why is my AVIF option grayed out? A: Your browser does not support AVIF encoding. Try using Chrome 121 or newer.
Q: What happens to transparency when converting to JPEG? A: JPEG does not support transparency. The tool fills transparent areas with white before converting.
Q: Can I convert animated GIFs? A: The tool converts the first frame of an animated GIF. Full animation conversion is not supported.
Q: Why does my GIF look different from the original? A: GIF is limited to 256 colors. Photographic images with millions of colors will be reduced to 256 using a popularity-based palette, which can cause visible color banding.
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