Convert a PNG or JPEG screenshot with Google’s cwebp command-line encoder, then inspect the WebP at the size it will appear on your site. For example, cwebp -q 80 screenshot.png -o thumbnail.webp uses Google’s documented quality example; it is a starting point, not a universal best setting.
Convert a screenshot to WebP with cwebp
Install Google’s cwebp utility for your operating system using the instructions for your environment, then run this command from a terminal:
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cwebp -q 80 screenshot.png -o thumbnail.webpReplace screenshot.png with the path to your PNG or JPEG and thumbnail.webp with the desired output path. The -o option names the output file, so use a .webp extension. Google’s documentation describes -q 80 as an example; judge the result visually rather than treating 80 as an ideal for every screenshot. Google’s cwebp documentation lists supported inputs and encoding options.
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If the output needs a different size, add -resize followed by width and height in pixels. Use 0 for one dimension to preserve the aspect ratio:
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cwebp -q 80 -resize 480 0 screenshot.png -o thumbnail.webpThis creates a 480-pixel-wide output and calculates its height proportionally. Use -crop before resizing only when you need to change the framing; cwebp crops before it scales. Check the documentation for the crop arguments and ensure the chosen crop fits within the source image.
Keep the original
Convert from a copy or retain the original screenshot. That lets you compare another quality setting, adjust the crop, or produce a lossless version without having to recreate the source.
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Choose compression by inspecting the actual image
Lossy WebP
Lossy encoding is cwebp’s default. Its -q setting controls RGB compression quality from 0 to 100: lower values generally mean smaller files and more visible loss. Start with a reasonable test value, then compare the output with the source at the thumbnail’s actual rendered size. Pay particular attention to small lettering, thin rules, icons, and sharp interface edges.
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Lossless and near-lossless WebP
Use -lossless when preserving source pixels matters more than minimizing file size:
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cwebp -lossless screenshot.png -o thumbnail.webpLossless output is not guaranteed to be smaller than the source or than a lossy WebP. If lossless output is too large, compare -near_lossless, which preprocesses the image before lossless encoding. Its documented range is 0 (most preprocessing) to 100 (none); inspect the result because preprocessing can change pixels.
Transparency and metadata
cwebp supports alpha transparency and provides a separate alpha-quality control. If RGB values in fully transparent pixels must be retained, use -exact. For metadata, -metadata can copy all, exif, icc, or xmp; the documented default is none. Preserve an ICC color profile when your publishing workflow requires it, and verify the output in the systems where it will be used.
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Check the output before publishing
- Compare appearance: open the WebP in a browser or image viewer next to the source. Look closely at text, line art, icons, edges, transparency, and crop.
- View at intended size: judge the thumbnail at the dimensions and display scale visitors will see, not only when zoomed in.
- Compare file size: check the source and converted file sizes. The savings depend on the image and settings; there is no guaranteed reduction percentage.
- Test delivery: confirm your site or publishing system accepts and serves WebP as expected. Keep the source available until the published result is verified.
Other ways to create a WebP
| Tool | Useful when | Documented controls |
|---|---|---|
| cwebp | You want a focused command-line encoder or need its WebP-specific options. | Quality, lossless and near-lossless encoding, resize, crop, alpha, metadata, and speed/effort controls. Documentation. |
| ImageMagick | Your workflow already uses ImageMagick for image processing and conversion. | WebP-specific encoder settings plus resize and format conversion. Its documented defaults include quality 75 and method 4; these are ImageMagick settings, not universal WebP recommendations. Documentation. |
| sharp | You need to convert images in a JavaScript application. | WebP output API with a documented quality option from 1 to 100 and default 80. Documentation. |
These tools document different controls and defaults; the documented values do not establish which tool is faster or produces better results for a given screenshot. Compare them on your own source images and versions if that choice matters.
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- The command is not found: install cwebp for your operating system or correct the executable’s PATH, then reopen the terminal and try again.
- The input cannot be opened: check the spelling and path, confirm the file exists, and try an absolute path if the terminal is in a different directory.
- The output is blurry or text is damaged: raise the lossy
-qvalue or compare lossless output. Inspect at the target size; numeric quality alone does not guarantee legibility. - The file is larger than expected: test a lower lossy quality or compare near-lossless encoding. Lossless output may be larger, and conversion does not guarantee a size reduction.
- The thumbnail framing is wrong: crop to the desired area before scaling. Verify the crop dimensions against the source and inspect the resulting aspect ratio.
- Colors differ after conversion: check whether your workflow requires an ICC profile and explicitly preserve metadata as needed. cwebp’s documented default copies no metadata.
- Transparent areas show unexpected color: verify alpha handling; use
-exactif RGB values in fully transparent pixels need to be preserved.
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If you still need to capture the page before converting it, ScreenshotNeo can return a PNG, JPEG, or WebP screenshot from one GET request. See the ScreenshotNeo API documentation for the request options.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and the response includes page-verdict and billing headers. Its MCP server gives AI agents screenshot, page-info, and PDF-capture tools. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Learn about ScreenshotNeo, then sign up for the free plan.
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