Free Image Format Converter - Convert PNG, JPG, WebP Online
Convert images between PNG, JPG, WebP, BMP, and GIF formats instantly. Adjust quality for lossy formats and compare file sizes side by side. All processing happens in your browser -- your images never leave your device.
Supports drag-and-drop, batch conversion, and quality control
Convert Your Images
Drag and drop images here
or click to browse -- PNG, JPG, WebP, BMP, GIF supported
Select Output Format
Image Format Comparison Guide
| Format | Type | Transparency | Best For | File Size |
|---|---|---|---|---|
| PNG | Lossless | Yes | Screenshots, graphics, logos | Large |
| JPG | Lossy | No | Photos, complex images | Small |
| WebP | Both | Yes | Web images, best compression | Smallest |
| BMP | Uncompressed | No | Editing, no compression needed | Largest |
| GIF | Lossless (256 colors) | Yes (1-bit) | Simple animations, icons | Varies |
How to Use This Image Converter
Upload Your Images
Drag and drop image files onto the upload area, or click to browse. You can select multiple images for batch conversion. PNG, JPG, WebP, BMP, and GIF formats are supported.
Choose Output Format
Select your desired output format from the grid. For JPG and WebP, use the quality slider to control the compression level. Higher quality means larger files.
Convert and Download
Click Convert to process your images. Review the side-by-side comparison with file size differences, then download your converted images individually.
How Image Format Conversion Works
FileReader → Image → Canvas → toBlob(mime, quality)This converter uses the HTML5 Canvas API to perform all image processing directly in your browser. No server upload is required at any point.
Step 1: Read the file with FileReader and create an Image elementStep 2: Draw the image onto an invisible HTML CanvasStep 3: Export the canvas as a Blob in the target formatStep 4: Create a download URL from the BlobKey details about the conversion process:
- Lossless formats (PNG, BMP) -- preserve every pixel exactly. File sizes tend to be larger, but there is no quality loss during conversion.
- Lossy formats (JPG, WebP) -- use compression algorithms that discard some data to reduce file size. The quality parameter controls how much data is discarded.
- Transparency handling -- when converting to JPG or BMP (which do not support transparency), transparent areas are filled with a white background.
- Color depth -- GIF is limited to 256 colors, which may cause visible banding on photographic images.
All processing uses standard browser APIs and runs entirely on your device. Your images are never uploaded, stored, or transmitted to any server.
Frequently Asked Questions
Is it safe to convert images with this tool?
Yes. All image processing happens entirely in your browser using the HTML5 Canvas API. Your images are never uploaded to any server. Nothing is logged, stored, or transmitted. You can verify this by using the tool offline after the page loads.
When should I use PNG vs JPG?
Use PNG for images that need transparency, screenshots, graphics with text, logos, and illustrations with sharp edges. Use JPG for photographs and complex real-world images where a smaller file size is more important than perfect quality. JPG files are typically 5-10x smaller than PNG for photographic content.
What is WebP and why should I use it?
WebP is a modern image format developed by Google that provides superior compression compared to both PNG and JPG. WebP images are typically 25-35% smaller than equivalent JPG files and support transparency like PNG. All major browsers support WebP, making it the best choice for web images.
Will converting between formats reduce image quality?
Converting to lossless formats (PNG, BMP) preserves full quality. Converting to lossy formats (JPG, WebP) may reduce quality depending on the quality setting. Use higher quality values (80-95) for minimal visible loss. Converting from one lossy format to another (e.g., JPG to WebP) can cause generation loss, so it is best to convert from the original source whenever possible.
What is the quality slider for?
The quality slider controls the compression level for lossy formats (JPG and WebP). A value of 100 means maximum quality with the least compression, while lower values produce smaller files with more compression artifacts. For most uses, 80-90 provides an excellent balance between quality and file size.
Can I convert multiple images at once?
Yes. You can select or drag-and-drop multiple image files at once. Each image will be converted to your chosen output format, and you can download them individually. This is useful for batch-converting a folder of images to a web-friendly format like WebP.
Privacy Notice
This image converter processes everything in your web browser using the Canvas API. Your images are never uploaded, stored, or processed on any server. All conversion happens locally on your device. You can safely use this tool with private or sensitive images.