PNG to WebP Converter

How it works

1. 1Choose your PNG file. The tool also accepts JPG, WebP, GIF and BMP files.
2. 2Wait for the browser checks. The page checks the file type, size and pixel count, then shows a preview with the image size.
3. 3Leave Convert to set to WebP, which is the default on this page. Set a quality, or turn on Lossless WebP.
4. 4Decide on Keep transparency and the background colour if your image has transparent areas.
5. 5Press Convert image, check the results panel, and download the WebP file.

Example output

Original PNG, 1600 x 1200 px, 90 KB

Converted WebP, quality 80, 22 KB

How to convert PNG to WebP

To convert PNG to WebP, start with your PNG file. Open the tool on this page and choose the image from your device. Before the file is uploaded, your browser checks its type, size and pixel count, and shows a preview with the image size. That gives you a chance to confirm you have the right file.

WebP is the default target on this page, so the Convert to list already shows WebP. Pick a quality, or switch on Lossless WebP if you need every pixel kept. Then press Convert image. When it finishes, the results panel shows a preview on a checkerboard, the file size, the formats converted, the pixel size, and how long the file is kept.

Use the Download button to save the converted file. Download links are short-lived, so save the file soon after it is ready. To change PNG to WebP again with other settings, adjust the options and convert the original file again.

What PNG to WebP conversion does

The converter decodes your PNG into pixels and encodes those pixels again as WebP. The picture is not resized, so the WebP has exactly the same width and height in pixels as the original. Nothing is cropped. Only the way the data is stored changes.

The conversion runs on our servers with sharp, a Node.js image library built on the libvips library. It is not artificial intelligence, and it does not guess missing detail. Because the conversion happens on our servers, your image is sent to our server. It is not processed in your browser.

A phone photo stored rotated is turned upright using its orientation tag. Camera and location tags (EXIF and GPS) are not copied into the result.

• The result has the same pixel width and height as the original.
• Nothing is cropped or resized.
• Camera and GPS tags are not copied into the result.

PNG or WebP: which should you use

Google reports that lossless WebP images are 26% smaller than PNG images. Google also reports that lossy WebP images are 25 to 34% smaller than comparable JPEG images at an equivalent SSIM quality index. These are Google's figures, published on its WebP page (developers.google.com/speed/webp), not our own measurements.

Flat graphics such as logos, icons and screenshots often suit PNG or lossless WebP, because they use few colours and have sharp edges. MDN recommends lossless encoding for screenshots, diagrams, logos and line art. Photographs usually suit lossy WebP, where the file gets much smaller and some detail is traded away.

Our own tests show the same pattern. The test pictures were generated by our scripts, not taken from real photographs. A flat illustration of 1600 x 1200 px and 90 KB became a 22 KB lossy WebP at quality 80. A lossless WebP of a similar flat illustration was 27 KB.

Lossy or lossless WebP

For lossy WebP, the quality setting runs from 1 to 100 and defaults to 80. A lower number makes a smaller file with more visible loss. A higher number keeps more detail and makes a larger file. Quality is not used for PNG output or when Lossless WebP is on.

Lossless WebP keeps every pixel exactly. The file is larger than a lossy WebP. Choose lossless for logos, interface screenshots and line art, where edges must stay sharp.

Each save loses some detail in JPEG and lossy WebP. Converting such a picture to PNG does not bring the lost detail back. It only stores the current pixels without further loss, and the PNG is often much larger. In our test, a 22 KB lossy WebP became a 290 KB PNG.

• Start with the default of 80 and compare the file size and the preview.
• Try a lossless WebP when the picture has text, sharp edges or flat colour.

Transparent PNG to WebP

WebP supports transparency in both lossless and lossy modes, so a transparent PNG can stay transparent after conversion. Keep transparency is on by default. The results panel shows whether transparency was kept or filled, so you can check the outcome.

If you turn Keep transparency off, the transparent areas are filled with the background colour. The default background colour is white, #ffffff, and you can change it. JPEG cannot store transparency, so converting a transparent PNG or WebP to JPEG always fills the transparent areas with the background colour.

Our test logo shows the size effect. A 1024 x 1024 transparent logo PNG of 37 KB became a 13 KB WebP at quality 80 with transparency kept. The same logo saved as a 25 KB JPEG had its transparent area filled with white. The test picture was generated by our scripts.

How much smaller is the WebP file

The saving depends on the picture. The Google figures quoted above are averages for its own test sets, not a promise about your file.

Our measured examples, using generated test pictures, show the range. The 1024 x 1024 logo went from 37 KB to 13 KB. A synthetic photograph of 2000 x 1500 px went from a 775 KB JPEG to a 529 KB WebP at quality 80. Saved as PNG, the same photograph was 7.5 MB.

A larger synthetic photograph of 4000 x 3000 px, 2.5 MB as a JPEG, became a 1.1 MB WebP at quality 80. Saved as PNG it would be about 28 MB, which is over the 20 MB result limit. Results vary by picture, so check the file size in the results panel.

Browser support and fallbacks

MDN lists WebP as supported in Chrome, Edge, Firefox, Opera and Safari. For Safari, it is version 14 or later on macOS Big Sur 11 or later. MDN recommends WebP or AVIF for raster images in general, with PNG or JPEG as fallbacks through the picture element.

WebP has less historical support than PNG and JPEG. Some older software, old email clients and some upload forms still do not accept WebP. That is the usual reason people convert WebP back to PNG or JPEG.

If your page must work everywhere, you can serve the WebP and keep the original PNG or JPEG as a fallback using the picture element. Check the software that will open the file before you replace the original.

JPG to WebP and other input formats

The tool accepts PNG, JPG, WebP, GIF and BMP files. The file type is read from the content, not the file name, so a renamed file is read as what it really is. SVG, PDF, TIFF, HEIC and AVIF files are not accepted.

JPG to WebP works the same way as PNG to WebP. Choose WebP as the target and convert. JPEG is a lossy format, so the picture has already lost some detail. Each new encode adds more loss, so a higher quality setting helps keep more detail.

If you have a camera original, convert that file instead of an earlier export of it. Each extra save adds loss.

Animated PNG, GIF and WebP files

An animated GIF or WebP is converted from its first frame only. The result is a still image, not an animation. The results panel says first frame only when the input was animated.

If you need the whole animation, this tool does not keep it. Keep the animated file as it is, or use a tool built for animation.

The API also reports whether the input was animated, in its result fields.

Size and file limits

The free web tool accepts images up to 5 MB each, with up to 16 MP (4096 x 4096) per image. You can convert 30 images per day per visitor. Anonymous use needs a human check (Cloudflare Turnstile). No watermark is added to the result.

Signed-in users can convert images up to 10 MB each, with the same pixel limit, and they skip the human check. Each image uses 1 credit. For each 5 MB of result after the first 5 MB, one more credit is used.

A result larger than 20 MB fails with an "output too large" message instead of giving you a cut-off file. A large photo saved as PNG can reach this limit. If that happens, choose JPEG or WebP, or lower the quality. Failed and timed-out jobs are refunded.

PNG to WebP from code

The API converts one image per request. Send the raw image bytes as the request body, not JSON or form data, to POST https://api.aiipworld.com/v1/image-jobs. Set Content-Type to image/png, add the operation and format in the query string, and send your API key as a Bearer token in the Authorization header.

Use op=image_convert and format=webp. Quality runs from 1 to 100 and defaults to 80. Set lossless=true to keep every pixel. The keep_transparency and background settings are also available. The response is 202 with a job_id. Poll GET /v1/jobs/:id until the status is succeeded, failed or timeout, then download the file from the short-lived download_url.

The page shows a ready cURL, Node and Python example below the tool. The API has no batch endpoint, so send one request for each image. Webhooks are not available yet. Errors include 400 for unsupported_image or invalid_params, 413 for file_too_large, 402 for insufficient_credits, and 429 when you are rate limited.

Privacy: what happens to your file

Your uploaded image is used only to make the converted file. It is deleted as soon as the job ends, whether it succeeds or fails. The converted file is kept for 10 minutes in the free web tool. No history is kept.

Download links are short-lived, so save the file to your device when it is ready. Anonymous conversions need a human check, which is provided by Cloudflare Turnstile.

You must have the right to use any image you upload. Read the Acceptable Use Policy before you convert pictures that belong to someone else.

Related tools

If you need the reverse, use the WebP to PNG page. It is the same tool with PNG as the default target. Use it when a program does not accept WebP and you need a PNG instead.

The site also has tools for PNG to SVG, which traces a picture into vector paths, and SVG to PNG, which turns an SVG file into a PNG. To make a picture from HTML, use the HTML to PNG tool.

The WebP to PNG page also covers WebP to JPG, because you can pick JPEG as the target there.

Questions