How to Use PNG to WebP
Follow these steps, then review the result and the limitations below:
- Choose a PNG file using Select Image File. The original stays on your device.
- Set WebP quality between 0.1 and 1.0. Start at 0.8, then compare the preview with your original.
- Leave width and height blank to keep the source dimensions. Set only one dimension to preserve the aspect ratio, or both to choose an exact size.
- Click Convert to WebP. Check the dimensions, byte sizes, and preview before using Download WebP.
Practical Worked Example
A 120 × 60 transparent PNG converted without resizing remains 120 × 60. Transparent areas remain transparent in the WebP. Setting only width to 60 produces a 60 × 30 image. Byte size depends on the pixels, quality setting, and browser encoder.
Key Features & Capabilities
- Checks the file signature and rejects files that are not PNG.
- Offers an output preview and an explicit download link.
- Reports original and output byte counts, dimensions, and whether size increased or decreased.
- Keeps transparent pixels when exporting WebP.
How It Works (Technical Overview)
The browser decodes the selected image, draws it to a canvas, and requests image/webp from its encoder. The result is checked for the WebP MIME type and RIFF/WEBP signature before a download is offered. No image-processing API request is made. Other page services, such as advertising and analytics, have separate privacy behavior.
Real-World Use Cases & Applications
- Product cutouts: Export a transparent product image for a storefront that accepts WebP.
- Interface artwork: Compare the converted icon or screenshot at its intended display size.
- Illustrated pages: Reduce dimensions for a smaller placement while keeping an untouched PNG master.
Privacy, Security & Accuracy
Requires a browser with WebP canvas encoding. Lossy encoding may soften text, edges, or fine detail. The converter rejects unsupported output rather than downloading a PNG with a .webp extension. Device memory can impose lower limits than the application caps.
Pro Tips for Best Results
For logos, small text, and diagrams, compare the original PNG with the WebP at 100% zoom. If edges become soft or the PNG is smaller, keep the PNG.
Frequently Asked Questions
Will WebP always be smaller?
No. An already optimized source, a tiny image, or a high quality setting can produce a larger file. The converter shows the measured difference.
Is quality 1.0 a lossless mode?
No. This is the browser canvas quality control, not an explicit lossless WebP encoder. Keep the original if exact pixel values matter.
What happens to transparency?
PNG alpha transparency is drawn to the canvas and retained in WebP. Check translucent edges against light and dark backgrounds.
Why is my file rejected?
Choose a valid PNG file, not a renamed file of another format. Animated PNG is rejected to avoid silently discarding frames. Files above 20 MiB and outputs above 16 million pixels are not accepted by this converter.
Are metadata and animation preserved?
No. This workflow exports a static canvas image. EXIF, GPS, text metadata, color profiles, and other source metadata are not intentionally copied. Browser color handling can change appearance.
Can I upload WebP everywhere?
Check the destination first. Some forms, email systems, and older software accept only JPEG or PNG. Converting a file does not change the formats a destination accepts.
Related Tools
Explore complementary tools in the Image Tools suite:
- Image Compressor — Export browser-readable images as JPEG with adjustable quality and optional dimensions. Output size may vary.
- JPG to WebP — Convert a JPG or JPEG photograph to WebP with adjustable quality, optional resizing, and an output preview.
- Image Resizer — Resize a static image by dimensions or percentage and export PNG. One dimension preserves the aspect ratio.
- Crop Image — Crop a static image using left, top, width and height in pixels, then download the selected region as PNG.