PNG Converter
Free online PNG image converter. Convert PNG files to JPG, PNG, WebP, AVIF and more. 100% browser-based, no upload required.
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Your files never leave your device. All conversion happens 100% locally in your browser.
What Is the PNG Image Format?
PNG (Portable Network Graphics) is a lossless image format developed in 1995 as an open-source replacement for the patent-encumbered GIF format. Unlike JPEG, which uses lossy compression that permanently discards image data, PNG uses lossless compression via the DEFLATE algorithm. This means every pixel in a PNG file is stored exactly as it was captured, making PNG ideal for images that need to be edited multiple times, images containing text or sharp edges, and any work where preserving absolute accuracy matters.
PNG also supports a full alpha transparency channel, allowing pixels to have varying degrees of transparency from fully opaque to completely invisible. This capability makes PNG the standard format for logos, UI elements, icons, illustrations, and any graphic that needs to appear over different backgrounds without a white or colored box around it.
PNG vs. JPG, WebP, and AVIF: When to Convert
PNG to JPG
Convert PNG to JPG when file size matters more than lossless quality. JPG files are dramatically smaller, making them ideal for photographs shared via email, social media, or embedded in presentations. Note that transparent areas in a PNG will be replaced with a white background when converting to JPG.
PNG to WebP
WebP offers both lossless and lossy compression with transparency support, producing files significantly smaller than PNG while maintaining excellent quality. Converting PNG to WebP is the recommended optimization for web developers who need smaller page sizes without losing alpha transparency support.
PNG to ICO
ICO (icon) files are used as website favicons and application icons on Windows. Converting a PNG to ICO is a common task for web developers setting up browser tab icons. Our converter handles this directly in the browser, generating a properly formatted ICO file from any PNG.
PNG Lossless Compression Explained
PNG compression works by applying two processes: a prediction filter called the PNG filter, followed by DEFLATE compression. The filter examines each row of pixels and predicts each pixel value based on its neighbors, then stores only the difference (delta) between the predicted and actual value. This delta is typically much smaller than the raw pixel value, allowing DEFLATE to compress it more efficiently.
Because PNG compression is entirely lossless, a PNG file can be decompressed back to exactly the original pixel data every time. This makes PNG perfect for images that will be repeatedly opened, edited, and resaved, since each save cycle introduces no quality degradation. In contrast, saving a JPG file repeatedly reduces quality each time due to repeated lossy re-encoding.
Frequently Asked Questions About PNG Conversion
Does PNG support transparency?
Yes. PNG supports a full 8-bit alpha channel, allowing each pixel to have 256 levels of transparency. This is what enables smooth edges, drop shadows, and transparent backgrounds in PNG graphics. WebP also supports transparency, but JPG, BMP, and TIFF do not.
Will converting PNG to JPG reduce quality?
Yes. Converting from lossless PNG to lossy JPG will introduce some compression artifacts, particularly in areas with sharp edges, text, or flat solid colors. For photographic images the difference is often imperceptible, but for logos and diagrams JPG compression artifacts will be visible. Use WebP or keep PNG for those cases.
Are my PNG files uploaded to a server?
No. All PNG conversion runs entirely in your browser. Your images are never uploaded, never stored, and never seen by anyone. The process is 100% local and private on your device.