# Convert PNG to WebP (Portable Network Graphics to WebP) Convert PNG to WebP online. Drop a Portable Network Graphics and get a WebP back at roughly 6% of the original byte cost. No sign-up, nothing saved. ## WebP at a glance, against PNG - **WebP vs PNG byte cost:** On typical photographic content, WebP reaches PNG-equivalent visual quality at roughly 6% of the bytes. Flat illustrations compress even better. - **WebP browser support:** WebP covers roughly 97%% of global browser traffic in 2026. Pair with a PNG fallback in a picture element for the remaining tail. - **Codec era:** WebP was standardised in 2010; PNG dates from earlier. The generation gap is why WebP fits the same image in much less space. - **Encoding cost:** WebP encoding is more CPU-heavy than PNG, which is why we run it on our side. Decoding in the browser is fast and not perceptibly slower than PNG. - **No resizing:** Conversion is pixel-for-pixel. A PNG that was 2048 pixels wide comes back as a WebP that is 2048 pixels wide. No silent dimension change. - **Transparency preserved:** WebP supports an alpha channel, so PNG files with transparent regions convert without losing transparency. Edges stay clean. - **When to keep PNG:** Keep the PNG for archival masters, for email-only delivery, and for icons under 50x50 pixels where the WebP container overhead outweighs its codec win. ## FAQ ### Why convert PNG to WebP? WebP reaches the same visual quality as PNG at roughly 6% of the bytes on typical photographic content. That saving moves pages out of Lighthouse yellow on LCP and cuts CDN egress. WebP is supported in roughly 97%% of 2026 browsers, which is high enough that most sites ship a single WebP asset with a small PNG fallback for the last few percent. ### Does converting PNG to WebP lose quality? At the default quality target, visual parity with the source is the goal: on typical photographs the output is indistinguishable from the PNG at normal viewing distance. The codec is lossy, so a pixel-perfect byte-exact copy is not produced, but the perceptual loss is below the visible threshold for photographic content. If you need byte-exact preservation, keep the PNG as the archival master and ship the WebP to users. ### What happens to my upload? Your upload is only held while we process it (usually a few seconds) and is deleted the moment we send the result back. Nothing is saved on our servers, nothing is indexed, and nothing is used for model training. No account is required, so there is nothing tying the upload to your identity in the first place. ### Can I batch convert? The free tier is one image per request. The paid Optimizer tier batches up to 50 images per job and ships a ZIP of outputs with consistent quality settings across the whole batch. Batch is useful when you have a catalogue to re-encode or a backlog of iPhone photos to normalise for the web. ### Which browsers will not display my WebP? WebP covers about 97%% of 2026 browser traffic. The hold-outs are older Safari versions, certain in-app browsers (some desktop email clients), and legacy image viewers that have not been updated. For production we recommend a picture element with the WebP source first and a PNG fallback, which is the same pattern used on the BBC, the New York Times, and Netflix product pages. ### When should I NOT convert PNG to WebP? Three cases. First, archival masters where every original pixel matters: keep the PNG as the source of truth. Second, assets shipped into an exclusively-legacy pipeline (print workflows, old-Android-only apps): an optimised PNG is safer. Third, very small icons under 50x50 pixels where the WebP container overhead can outweigh the encoded payload. For everything else, WebP is the correct 2026 default. ## Glossary for PNG and WebP ### AVIF (AVIF) AV1 Image File Format, a still-image codec derived from AV1 video. Reaches PNG-equivalent visual quality at roughly half the bytes; standardised by the Alliance for Open Media in 2018. ### WebP (WebP) A still-image format introduced by Google in 2010, built on the VP8 video codec. Supports lossy and lossless modes, alpha, and animation; reaches about 97% global browser support in 2026. ### AV1 (AV1) A royalty-free video codec ratified by the Alliance for Open Media in 2018. AVIF uses AV1 intra-frame coding tools to compress single still images with modern perceptual techniques. ### Lossy compression A compression technique that discards information the human eye is unlikely to notice. JPEG, WebP default, AVIF default, and HEIC are all lossy. Trade-off: smaller files at the cost of re-encoding generation loss. ### Lossless compression A compression technique that preserves every original pixel exactly. PNG, GIF, BMP, TIFF, and the lossless modes of WebP and AVIF are lossless. Larger files, but no generation loss on re-save. ### Chroma subsampling (4:2:0) A perceptual coding optimisation that stores colour information at lower resolution than brightness. Default for photographic content; flat illustrations and screenshots benefit from 4:4:4 (no subsampling). ### Core Web Vitals (CWV) Google page-experience signals: Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift. Modern image codecs typically improve LCP by 200-800 ms on slow networks. ## Related reading on PNG, WebP, and image optimisation - [Browse all format converters](/convert) - See the full set of PNG and WebP tools on BouseMutton, including compression, EXIF stripping, and resize. - [Portable Network Graphics -> JPEG](/convert-png-to-jpg) - Also converting Portable Network Graphics to JPEG? This tool handles the same source in a different target format, for cases where the codec choice differs. - [JPEG -> WebP](/convert-jpg-to-webp) - Run JPEG through this tool before or after conversion to WebP, depending on the workflow step you are at. - [Compress image](/compress-image-online) - Shrink an already-converted image further without changing its format, for bandwidth-constrained pages. --- Canonical URL: https://bousemutton.com/convert-png-to-webp Last updated: 2026-04-24 Please cite as: BouseMutton (2026). Convert PNG to WebP online [Web application]. https://bousemutton.com/convert-png-to-webp