PNG vs JPG vs WebP: Which to Use and How to Convert Images (2026)

TL;DR: Use JPG for photographs, PNG for graphics, logos, screenshots and anything that needs transparency, and WebP when you want the best of both for the web — smaller files than JPG with transparency like PNG. AVIF is even smaller but less universally supported; GIF is essentially obsolete except for short looping animations. Below we explain what each format actually is, when to pick it, and how to convert between them in a few clicks — privately, right in your browser.

Choosing an image format sounds trivial until a logo shows up with an ugly white box behind it, a photo balloons to 12 MB, or a website refuses your upload because the file is "too big." The fix is almost always the same: the wrong format for the job. This guide gives you a simple rule for every situation and a no-upload way to convert.

The 10-second answer

If you don't want to read the whole thing, here's the cheat sheet:

• Photo (people, landscapes, anything realistic)? → JPG, or WebP for the web.
• Logo, icon, screenshot, illustration, or anything with text or sharp edges? → PNG, or WebP for the web.
• Need a see-through background? → PNG or WebP (never JPG — it can't do transparency).
• Building a website and want fast load times? → WebP for almost everything.
• Short looping animation? → an animated WebP or a video; GIF only if you truly need GIF.

What each format actually is

JPG / JPEG — the photo format

JPG (also written JPEG, the two are the same thing) is the format your phone camera and most cameras save photos in. It uses lossy compression: to make files small it permanently throws away detail your eye is unlikely to notice. That trade-off is perfect for photographs, where colors shift gradually and a little lost detail is invisible. The downsides are that JPG has no transparency, and that every time you re-save a JPG it loses a bit more quality, so edges and text can get muddy over repeated edits.

PNG — the graphics format

PNG uses lossless compression: it stores every pixel exactly, so nothing is ever degraded. That makes it the right choice for logos, icons, screenshots, charts and illustrations where sharp edges and crisp text matter. PNG also supports a full transparent background (and partial transparency), which is why it's the go-to for overlays and graphics that sit on top of other content. The cost is file size: for a detailed photo, a PNG can be many times larger than the equivalent JPG.

WebP — the modern all-rounder

WebP, developed by Google, is the format built for today's web. It can do both lossy compression (like JPG) and lossless compression with transparency (like PNG), and at the same visual quality it's typically 25–35% smaller than JPG and often much smaller than PNG. It also supports animation. In 2026 every major browser supports WebP, so for content you publish on a website it's usually the best single choice. The one caveat: some older desktop apps and a few platforms still don't accept WebP uploads, so it's not yet the universal "email it to anyone" format.

A quick word on AVIF and GIF

AVIF is the newest format here. It compresses even better than WebP — often noticeably smaller at the same quality — and supports transparency and HDR. Browser support is now broad, but tooling and older-software support still lag WebP, so it's a great choice for web performance if you're comfortable on the cutting edge. GIF is the old animation format; for static images it's worse than everything above (only 256 colors), and even for animation a short video or animated WebP/AVIF looks better at a fraction of the size. Use GIF only when a platform specifically requires it.

Side-by-side comparison

Reading the table: for raw web performance WebP and AVIF win; for guaranteed compatibility JPG and PNG win. Match the column to your situation rather than looking for one "best" format.

Which format for which job

Uploading to a website or your own blog

Use WebP for nearly everything — photos, banners and graphics alike. Smaller files mean faster pages, better Core Web Vitals and lower bandwidth. Keep a JPG or PNG fallback only if you must support unusually old clients.

Sending through messaging apps (WhatsApp, Telegram, iMessage)

Stick with JPG for photos. Messaging apps re-compress images anyway, and JPG is accepted everywhere with zero friction. WebP can occasionally display oddly when forwarded between apps.

Logos and anything with a transparent background

Use PNG as the safe universal choice, or WebP if it's going on the web. Never use JPG: because it has no transparency, your transparent areas will be filled in with a solid (usually white) box.

Photos you want to keep at full quality

Archive your originals in the highest quality you have (camera JPG, or RAW/TIFF if you shoot that way) and only make compressed copies for sharing. Remember: each new lossy save degrades a JPG a little more, so always re-export from the original, not from a copy of a copy.

Screenshots

Use PNG (or WebP). Screenshots are full of crisp text and sharp UI edges — exactly the content JPG handles worst, where you'd see fuzzy "halos" around letters.

File size vs quality, explained simply

Every format trades size against quality differently. Lossless formats (PNG) keep 100% of the detail and pay for it in file size. Lossy formats (JPG, and WebP/AVIF in lossy mode) let you dial quality down to shrink the file, accepting some invisible-to-tiny detail loss in return.

The single most important rule: quality is decided the first time an image is compressed, and you can never add it back. Converting a low-quality JPG to PNG doesn't restore lost detail — it just stores the already-degraded pixels in a bigger file. So always start from the best original you have, and don't expect a format change to "upgrade" a blurry image.

How to convert an image, step by step

Converting between formats is quick once you know the format you want. Here's the simplest, most private way — straight in your browser with nothing to install:

1. Decide your target format using the rule above (photo → JPG/WebP, graphic or transparency → PNG/WebP).
2. Open the free StalkStory image converter in your browser.
3. Drag your image in, or tap to select it from your device. Nothing is uploaded — the file stays on your computer or phone.
4. Pick the output format (PNG, JPG or WebP). For lossy formats, choose a quality level — around 80% is a great balance of size and looks.
5. Click convert and download the new file. Done in seconds.

That's it. Because the conversion happens locally in the browser, it works offline once the page is loaded and it's the safest option for anything sensitive — personal photos, screenshots of documents, or an ID you only need to reformat.

Common mistakes to avoid

A note on privacy when converting

Most online converters upload your file to their servers, process it there, and send it back. For a meme that's fine — but for a passport scan, a medical document or a personal photo, you've just handed a stranger's server a copy of something private, and you have no real control over how long they keep it.

The better approach is browser-based conversion, where modern browsers do all the work on your own device and the image never travels over the internet at all. The StalkStory image converter works this way: your file is read and converted locally and is never sent anywhere. If privacy matters to you, always prefer a tool that converts on your device over one that uploads.

Frequently asked questions