What Is a WebP File? Format Explained, Pros, Cons, and When to Convert

You downloaded an image, and the file extension is .webp — not .jpg, not .png. What is this format, why does it exist, and do you need to do anything about it?

A WebP file is a modern image format developed by Google. It is designed to produce smaller files than JPG or PNG without sacrificing visible quality. If you have started seeing .webp files appear on your device when you did not expect them, there is a simple reason for it — and whether you need to convert them depends entirely on what you plan to do with the image.

What is a WebP file?

WebP is an image format created by Google and released publicly in 2010. It is built on the VP8 video codec — a completely different technical lineage from JPEG, which dates to 1992. Google designed WebP specifically for web delivery: smaller files, faster page loads, less bandwidth.

A single WebP file can do things that a JPG cannot:

• Lossy compression — like JPG, for photographs and complex images
• Lossless compression — like PNG, for graphics that require perfect fidelity
• Alpha transparency — like PNG, for images with transparent backgrounds
• Animation — like GIF, but far more efficient

For a photograph published on a website, the difference that matters most is file size under lossy compression. That is where WebP consistently beats JPG.

The WebP format is not experimental or obscure. Every major browser — Chrome, Edge, Firefox, Safari, Samsung Internet — has supported it since at least 2020. Most content management systems, image CDNs, and modern web tools handle WebP natively. If you visit a major website today, a significant portion of the images loading in your browser are likely WebP files.

Why you have a WebP file (when you didn’t ask for one)

The most common reason people encounter a .webp file unexpectedly is Chrome. When you right-click an image on a webpage and save it, Chrome saves it in whatever format the server delivered — and for most modern websites, that is WebP. You asked for an image; you got a WebP file.

Other common sources:

• Android devices — many Android phones save screenshots and downloaded images as WebP by default
• Google services — images from Google Photos, Google Search results, and other Google properties are frequently served as WebP
• Web scrapers and download tools — tools that pull images from the web grab whatever format the server sends
• CDN-served images — major CDNs automatically convert images to WebP when serving them to supported browsers

None of this is wrong. The site is doing the right thing for performance. The WebP file you ended up with is technically a better image file than the JPG equivalent would have been — smaller, same quality. The question is whether the software you want to open it in supports WebP.

WebP vs JPG

For most people, the practical comparison comes down to these four areas.

File size: WebP is consistently 25–35% smaller than JPG at equivalent visual quality. A photograph that encodes to 200 KB as a JPEG typically encodes to around 130–150 KB as WebP. At scale — a product page with ten images, a blog with hundreds of posts — those savings are substantial. Facebook, YouTube, and Google have all published data showing consistent savings in the 25–35% range after switching from JPEG to WebP.

Image quality: At the same file size, WebP looks better. JPG compression produces blocky artifacts around sharp edges and high-contrast areas when pushed hard. WebP’s artifacts are softer and appear at lower quality thresholds, which is how it achieves the same perceived quality at a smaller file. At high quality settings (80+), the two formats are visually indistinguishable to most people. The gap grows at moderate settings where JPG starts showing compression noise.

Browser and web compatibility: Equal. Both formats display correctly in every major browser. For images published on websites, WebP is the better default — smaller files, same display quality.

Compatibility outside the browser: JPG wins decisively. Every operating system, every image viewer, every email client, every design tool, every print service, every legacy application handles JPG. WebP support outside browsers is improving but still patchy. Older Windows applications, many email clients, some design tools, and most print workflows do not handle WebP reliably.

Summary: for web delivery, WebP is better. For everything else — sharing via email, handing files to clients, sending to a print service, opening in legacy software — JPG is safer.

WebP vs PNG

JPG and WebP are both primarily lossy formats. The comparison with PNG is different because PNG is lossless — it preserves every pixel exactly and supports full transparency.

Use WebP instead of PNG when:

• the image is a photograph or has complex gradients
• you do not need perfect pixel-level fidelity
• file size matters and you are fine with lossy compression
• you need transparency (WebP supports alpha channels; JPG does not)

Use PNG instead of WebP when:

• you need lossless compression — screenshots, UI assets, diagrams, text-heavy graphics
• the file will be edited further and you cannot afford generational quality loss
• you are working in a tool or workflow that does not support WebP
• you need maximum compatibility for a file that will be handled outside a browser

WebP does support lossless mode, so in theory it can replace PNG too. In practice, lossless WebP file sizes are not dramatically smaller than PNG, and PNG has much broader software support for lossless workflows. For photographs and complex images, WebP beats both. For graphics, diagrams, and anything needing pixel-perfect reproduction, PNG remains the standard.

WebP support: what can open a WebP file today

Browsers: Universal. Chrome (2014), Edge (2018), Firefox (2019), Safari (2020). In 2026, over 97% of web users worldwide are on a browser that supports WebP.

Operating systems:

• macOS — Preview opens WebP natively on current versions
• Windows 11 — Photos app supports WebP natively
• Windows 10 — requires the WebP Image Extensions from the Microsoft Store, or a third-party viewer
• iOS — supported natively since iOS 14
• Android — supported natively since Android 4.0

Image editors:

• Adobe Photoshop — supported since version 23.2 (2022)
• Affinity Photo — supported
• GIMP — supported since version 2.10
• Older versions of these tools may not support WebP

Email clients: Mostly no. Outlook, Apple Mail on older iOS, and many web-based mail clients do not render WebP images reliably. For email, convert to JPG or PNG first.

The gap that still matters in 2026: Browsers are fine. Consumer operating systems are mostly fine. The real friction is in specialized tools — print workflows, legacy design software, CMS platforms with older upload pipelines, and email. If the WebP file stays in a browser context, it works everywhere. If it needs to travel through non-browser software, you may hit problems.

Should you convert your WebP file to JPG?

It depends on what you are doing with the image.

Use case	Recommendation
Publishing on a website	Keep as WebP
Sending via email	Convert to JPG
Sharing with a client or collaborator	Convert to JPG
Uploading to a print service	Convert to JPG
Opening in Photoshop (current version)	Either works
Opening in older image software	Convert to JPG
Posting to social media	Either works (most platforms accept both)
Archiving originals	Keep as WebP or convert to a lossless format

The rule of thumb: if the image stays on the web or in a browser, keep it as WebP. If it needs to leave that environment and land somewhere you do not control, convert to JPG.

If you need to convert, privateconvert.org’s WebP to JPG converter handles it in your browser — no upload, no server, nothing leaves your device. For a full walkthrough of the conversion process, see the separate guide on how to convert WebP to JPG.

Frequently asked questions

What is a WebP file? A WebP file is an image in Google’s WebP format, identifiable by the .webp file extension. Google designed it to deliver smaller files than JPG or PNG without visible quality loss. It is the dominant format for images served on modern websites.

Why does my image save as WebP when I right-click it? Chrome saves images in the format the server delivered. Most modern websites serve images as WebP because it is smaller and faster. The .webp extension is expected behavior — Chrome is saving the actual file it received.

Is a WebP file worse quality than JPG? No. At equivalent file sizes, WebP typically looks better than JPG because its compression produces fewer blocky artifacts. You end up with a smaller file at the same visual quality, not a degraded file.

Can Windows open WebP files? Windows 11 opens WebP natively in the Photos app. On Windows 10, you need the free WebP Image Extensions from the Microsoft Store, or a third-party viewer like IrfanView. Legacy Windows applications (Paint, Windows Photo Viewer) do not support WebP.

Can I use WebP images in emails? Not reliably. Most email clients, including Outlook, do not render WebP images. Convert to JPG before attaching images to emails or embedding them in email bodies.

Does converting a WebP file to JPG reduce quality? Any conversion between lossy formats involves some re-encoding, which can introduce minor additional compression. At a quality setting of 85–90, the result is visually indistinguishable from the WebP original for most images. Converting from a heavily compressed WebP at very low quality settings will show more degradation.

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If you have a WebP file you need to convert, the WebP to JPG converter runs entirely in your browser and converts without uploading your images to any server.