daytics™
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How to Convert Images Online
- Upload your images — Drag and drop one or more image files into the upload area, or click to browse and select files from your device. All common image formats are accepted as input.
- Select the output format — Choose JPG, PNG, or WebP from the "Convert to" dropdown menu. Each format has different strengths depending on your needs.
- Adjust the quality setting — Use the quality slider to control the trade-off between file size and visual quality. Higher values preserve more detail but produce larger files. For JPG and WebP, 80-90% is a good starting point.
- Review your converted images — Each converted file appears in the results list showing the original format, new format, and final file size.
- Download the results — Click the Download button next to each image to save the converted file to your device with the correct file extension.
How Image Conversion Works
Our image converter uses the HTML5 Canvas API built into your web browser to perform format conversion entirely on your device. When you upload an image, it is decoded and drawn onto an invisible canvas element. The canvas then exports the image data in your chosen output format, applying the appropriate encoding algorithm for JPG, PNG, or WebP.
When converting to JPG or WebP, the canvas applies lossy compression during the export step. The quality slider controls the compression ratio, with higher values retaining more visual detail at the cost of larger file sizes. When converting to PNG, the export uses lossless encoding, which preserves every pixel of the original image. This is why PNG files tend to be larger, but they are ideal when perfect quality is required.
Because the entire process happens in your browser, there is no need to upload files to a remote server. This makes the conversion instant, private, and free from server-imposed file size restrictions. The tool works on any modern browser across desktop and mobile devices.
Frequently Asked Questions
When should I use JPG vs PNG?
Use JPG for photographs and complex images with many colours and gradients, as it produces small files through lossy compression. Use PNG when you need transparency (such as logos or icons) or when you need pixel-perfect lossless quality, such as screenshots, diagrams, or text-heavy images. JPG does not support transparency, so PNG is the only choice for images with transparent backgrounds.
What are the benefits of WebP format?
WebP is a modern image format developed by Google that provides superior compression compared to both JPG and PNG. WebP files are typically 25-35% smaller than equivalent JPG files and support transparency like PNG. Most modern browsers including Chrome, Firefox, Safari, and Edge support WebP natively, making it an excellent choice for web optimisation.
Does converting between formats cause quality loss?
Converting to a lossy format like JPG or WebP can cause some quality loss because these formats discard image data during encoding. Converting to PNG (lossless) preserves all quality. To minimise quality loss during conversion, use the highest quality setting that still meets your file size requirements. Avoid converting back and forth between lossy formats, as each conversion compounds the quality loss.
Can I convert multiple images at once?
Yes. Our converter supports batch processing. You can drag and drop or select multiple images at the same time, and all of them will be converted to your chosen output format with your selected quality level. Each converted file can be downloaded individually from the results list below the upload area.
What is the best image format for websites?
WebP is the best overall format for websites because it combines small file sizes with support for transparency and animation. For maximum browser compatibility, JPG is the safest choice for photographs. Use PNG only when transparency or lossless quality is essential, as PNG files are significantly larger than their JPG or WebP equivalents.
Are my images uploaded to a server during conversion?
No. All conversion happens locally in your browser using the HTML5 Canvas API. Your images are never uploaded to any server, ensuring complete privacy and instant processing. There are no file size limits imposed by server constraints, and the conversion works even without an internet connection after the page has loaded.
