Convert PNG to WebP Online - Free, No Account Needed
PNG files are significantly larger than necessary for most web images. Converting to WebP preserves transparency (unlike JPEG) while reducing file size by 50-70% for photographic content and 20-40% for graphics. WebP is supported by all modern browsers and is the recommended replacement for PNG in web publishing. Your file is sent over HTTPS to our server, converted and deleted straight after, with no account needed.
Drag & Drop Images Here
or click to browse files
Files are sent securely to our server for conversion and deleted straight after. Files over 4.4MB are converted in your browser instead, so they are not uploaded.
Why convert PNG to WebP?
Up to 70% smaller than PNG, transparency supported
Why Convert PNG to WebP?
PNG files are significantly larger than necessary for web delivery. While PNG excels at lossless compression, WebP delivers superior compression while maintaining full transparency support. For most web images, WebP produces 60-70% smaller files than PNG at equivalent visual quality, with transparency preserved.
This file size reduction has a measurable impact: PNG files that are 200 KB convert to WebP files of 50-80 KB, reducing page weight and improving Core Web Vitals scores. WebP is supported by all modern browsers (Chrome, Edge, Firefox, Safari) and is the recommended replacement for PNG in web publishing. Converting PNG graphics, product images, and UI elements to WebP directly improves page load speed and SEO rankings.
How to Convert PNG to WebP: Step by Step
Converting PNG to WebP with MeloTools takes under a minute and needs no software and no account. The file goes to our server over HTTPS and is deleted once the result is returned. 1. Drag and drop your PNG file into the converter above, or click to browse and select it from your device. 2. Your file travels over HTTPS to our server, where it is converted and sent back. 3. Preview the converted WebP output directly in the tool. 4. Click download to save the WebP file to your device. 5. Repeat for additional PNG files. Each uploaded file and its converted copy are deleted from our server as soon as the result is sent.
Is It Safe to Convert PNG Files Online?
Your PNG files are sent over an encrypted HTTPS connection to our server for conversion. Once the result is returned, the uploaded file and the converted copy are deleted straight away. On the free plan, files between 4.4MB and 5MB are converted in the browser instead. You do not need an account. We log the file name, size and output format of each conversion to count usage, but we do not store the image itself.
PNG vs WebP: Key Differences
PNG is a lossless image format developed in 1996 that supports transparency. It is supported universally across all devices, browsers, and software. However, PNG achieves only modest compression and produces large file sizes. WebP is a modern format developed by Google that supports both lossy and lossless compression with full transparency support. WebP is 60-70% more space-efficient than PNG for photographic content and 20-40% more efficient for graphics while preserving transparency. WebP is supported by all modern browsers and is the recommended replacement for PNG in web publishing. For maximum compatibility, serve WebP to modern browsers and PNG as a fallback using the <picture> element.
How Much Smaller Is WebP Than PNG?
The saving depends on what the image contains. A photographic PNG is typically 60-70% smaller as WebP at visually equivalent quality. Flat graphics such as logos and diagrams save less, with lossless WebP about 26% smaller than the same PNG. Because PNG stores every pixel exactly, it is typically 3-5 times larger than an equivalent WebP for photographic content.
WebP also covers what PNG is used for on the web: it supports transparency, and it supports animation, which standard PNG does not. Browser support is about 96% of global traffic, so a picture element with a PNG fallback covers the remaining legacy browsers.
Does PNG to WebP Reduce Image Quality?
For photographs, the difference is not visible at normal screen sizes. Our PNG to WebP converter writes lossy WebP at a fixed quality chosen for the web, so there is nothing to set.
Lossy compression can soften thin lines and small text, or cause banding in areas of flat colour. If your PNG is a logo, a screenshot with small text or a UI icon, check the result at full size. If edges look soft, keep the original PNG for that image. Keep your original PNG files either way, because a lossy WebP cannot be turned back into the original.
Why PNG to WebP Matters for SEO and Core Web Vitals
Smaller WebP files load faster, which improves Largest Contentful Paint, the time taken to show the biggest element on the page. On pages where a large PNG is the hero image, switching it to WebP is often the quickest single fix for a slow LCP.
What to Do After Converting PNG to WebP
Conversion is the first step. To finish the job: 1. Compress the WebP further with the MeloTools image compressor if the file is still heavier than you need. It runs in your browser and does not upload your image. 2. Use srcset so each device downloads the right size. A 2000px WebP is still too heavy for a phone. 3. Add width and height attributes to every img element to prevent layout shift. 4. Add descriptive alt text. Google indexes WebP images, and alt text is the main signal for image search.
When to Keep PNG Instead of WebP
WebP is the right choice for nearly all web-facing images. Keep PNG when you send files to print production that does not accept WebP, when a legacy CMS or email platform does not support WebP yet, or when you hand lossless source files to other designers who need a universally compatible original.
Frequently Asked Questions
How do I convert PNG to WebP online for free?
Drag and drop your PNG file into the MeloTools converter above. Your file is sent over HTTPS to our server, converted and deleted straight after. No account or software is needed. Download the converted WebP file immediately once processing is complete.
Does converting PNG to WebP reduce image quality?
Slightly, because the converter writes lossy WebP at a fixed web-friendly quality. For photographs the difference is not visible at normal viewing sizes, and files are typically 60-70% smaller. Thin lines, small text and flat colour gradients can soften, so check logos and screenshots at full size and keep the original PNG.
Does WebP support transparency like PNG?
Yes. WebP fully supports transparency (alpha channel), preserving transparent backgrounds when converting from PNG. This makes WebP suitable for logos, icons, graphics with transparency, and any image type that previously required PNG.
Is it safe to convert PNG files in an online tool?
MeloTools converts PNG files on our server, not on your device. The file travels over HTTPS, is converted, and is deleted along with the converted copy as soon as the result is sent. No account is needed. Free files from 4.4MB to 5MB are converted in the browser instead. We log the file name, size and output format to count usage, but we do not store the image itself.
Can I convert multiple PNG files to WebP at once?
Yes. MeloTools supports batch conversion. Drag and drop multiple PNG files into the converter at the same time and download each converted WebP file individually. The free plan supports up to 10 files per batch.
What is the difference between PNG and WebP?
PNG is a lossless format supported universally but with larger file sizes. WebP achieves 60-70% better compression than PNG while maintaining transparency support and is supported by all modern browsers. Use WebP as your primary format for web delivery with PNG as a fallback for maximum compatibility.
Is WebP supported in all browsers?
WebP works in all modern browsers, including Chrome, Edge, Firefox and Safari, covering about 96% of global web traffic. For the small number of legacy browsers, use a picture element with a PNG fallback so every visitor sees the image.
What is the difference between lossy and lossless WebP?
Lossy WebP discards some pixel data to make very small files. Lossless WebP keeps every pixel, like PNG, but at a smaller file size. The MeloTools PNG to WebP converter outputs lossy WebP, which suits photographs. For logos or text-heavy screenshots, check the result at full size and keep the PNG if edges look soft.
Will my WebP files be smaller than my PNGs?
Almost always. Photographic PNGs are typically 60-70% smaller as WebP at equivalent visual quality. Flat graphics save less, with lossless WebP about 26% smaller than the same PNG. Very small or already optimised PNG icons can occasionally save only a little.