WebP vs JPG vs PNG: Which Should You Use?
JPG, PNG, and WebP all do the same basic job — they store a picture as a file — but they go about it in very different ways, and picking the wrong one is one of the most common, and most fixable, mistakes people make with images online. Use the wrong format and you end up with a blurry logo, a photo that takes forever to load, or an upload rejected for being too large. Once you understand what each format is actually optimised for, the choice becomes almost automatic.
Lossy vs lossless: the one concept that explains everything
Every format decision comes down to one trade-off. Lossy compression (used by JPG, and optionally by WebP) throws away information the human eye is unlikely to notice — subtle colour gradients, fine noise in a busy area of a photo — in exchange for a much smaller file. Lossless compression (used by PNG, and optionally by WebP) keeps every single pixel exactly as it was, so nothing is lost, but the file stays bigger because there's less room to cut corners.
That's why a sunset photo compresses beautifully as a JPG but a screenshot with small text looks smeared in the same format — text and hard edges are exactly the detail lossy compression sacrifices first.
JPG — the workhorse for photographs
JPG (or JPEG) has been the default photo format since the 1990s for good reason: it was designed around how cameras capture light and how eyes perceive it. It handles smooth colour transitions, complex textures, and busy scenes — skin tones, landscapes, food photos — extremely efficiently, often shrinking a raw photo to a fraction of its original size with no visible loss.
Two limitations are worth knowing. First, JPG has no concept of transparency — every pixel gets a solid colour, so a "transparent" logo saved as JPG shows up with a white or black box around it. Second, JPG is generative lossy: every re-save of an already-compressed JPG loses a little more quality, and repeated edit-and-export cycles eventually produce visible blotchy artifacts around sharp edges.
If you only remember one rule: reach for JPG when the image is a photograph and you don't need a transparent background.
PNG — precision, transparency, and graphics
PNG was built as the lossless alternative to older formats, and it excels wherever exactness matters more than file size. Logos, icons, screenshots, diagrams, and anything with flat colours or crisp edges look identical to the original, pixel for pixel. Crucially, PNG also supports an alpha channel, meaning parts of the image can be fully or partially transparent — essential for a logo you want to place over different backgrounds.
The cost is size: because PNG can't throw information away, a photograph saved as PNG is often two to five times larger than the same image saved as a well-compressed JPG, with no visible quality benefit for that kind of content. If you receive a PNG that actually contains a photo and don't need transparency, converting it with PNG to JPG can shrink it dramatically.
WebP — built for the modern web
WebP is Google's answer to the "why do I have to choose?" problem. It supports both lossy and lossless compression in a single format, handles transparency like PNG, and — this is the headline feature — typically produces files 25-35% smaller than an equivalent-quality JPG or PNG. For a website, that difference translates directly into faster page loads and better mobile performance, and page speed is a factor search engines weigh, so it can even nudge rankings.
Every major browser released in the last several years supports WebP natively, so compatibility is rarely an issue for websites anymore. The remaining friction shows up in older desktop software and some email clients, which is why it's still smart to keep a JPG or PNG copy around for anything you might need to open outside a browser.
Step-by-step: getting the right format for the job
- Identify the content. Photograph or busy screenshot? Lean JPG or WebP. Logo or anything needing a see-through background? Lean PNG or WebP.
- Decide where it's going. Publishing to a website or app: WebP wins on speed. Sending to print or an older system: JPG or PNG is the safer bet.
- Convert it. Use JPG to WebP or PNG to WebP to shrink images for the web, or WebP to JPG if a program refuses to open a WebP file you've received.
- Check the result. Zoom in on any text or fine detail — if you see blotchy artifacts, dial back the compression a notch and re-export.
Platform notes: iPhone, Windows, and Mac
If you're coming from an iPhone, your photos are probably saved as HEIC by default, not JPG — and HEIC is even more restrictive than WebP when it comes to opening on other devices. Most Windows PCs and many web upload forms won't accept it. Converting with HEIC to JPG before you share a photo avoids that headache.
Older versions of Word, PowerPoint, or Photoshop on Windows may not accept WebP directly — export to JPG or PNG first if you're pasting into a document. On a Mac, Preview and Safari both handle WebP natively, but some older design tools still lag behind.
Why is my file still too big?
Format choice alone doesn't guarantee a small file — two other factors usually matter just as much. Resolution: a photo straight from a modern phone or camera is often 3,000-4,000 pixels wide, far larger than any screen will display it, so resizing down to the dimensions you'll actually use often cuts file size more than any format change could. Compression quality: both JPG and WebP let you dial quality up or down. If a converted file is still larger than you'd like, or needs to fit under a specific upload limit, Compress Image to Size lets you target an exact size rather than guessing at a quality percentage.
All of the conversions above run entirely in your browser — the image never leaves your device, so there's no upload wait for large files and no question about where your photos end up.
Frequently asked questions
Is WebP always better than JPG and PNG?
For file size, almost always — it beats both formats at equivalent visual quality. It isn't "always better" in an absolute sense, though: if you need guaranteed compatibility with old software or print workflows, JPG and PNG remain the safer universal choices.
Can I convert a JPG to PNG to add transparency?
No. A JPG has no transparent pixels to begin with, so converting it to PNG just gives you a PNG with a solid background — actually removing a background needs a purpose-built tool, not a format conversion.
Does saving a JPG multiple times ruin the quality?
Yes, gradually. Each export re-applies lossy compression, so repeated edit-and-resave cycles compound quality loss. If you're editing an image repeatedly, work from a lossless master and only export to JPG as the final step.
Which format should I use for a website logo?
PNG or WebP, not JPG. Logos usually need a transparent background and have sharp edges and flat colours — exactly what lossless compression handles best, and WebP gives you that with a smaller file.