JPG vs PNG vs WebP: Which Format Should You Use?

Guide • Updated: 2026-11-11 • Free, in your browser — your photos are never uploaded

JPG, PNG, WebP — every photo you take is saved in one of these formats, and picking the wrong one is the most common reason a file is too big, too blurry, or rejected by a form.

The rule is actually simple: JPG for photos, PNG for sharp graphics, WebP for the web. This guide explains why, and when to break the rule.

Quick facts — the three formats

JPG: best for photos; small files; no transparency; quality drops a little every time you save it
PNG: best for text, logos and screenshots; sharp edges; supports transparency; much bigger files for photos
WebP: modern format; smaller than JPG at the same quality; not accepted by all government forms — check first

JPG — the right choice for photos and forms

JPG was built for photographs. It compresses the smooth tones of a face or a landscape very efficiently, which is why a passport photo can fit under 240 KB and a signature under 20 KB as a JPG. Almost every government and exam form asks for JPG, so when a form says “upload a photo”, it almost always means JPG. The one weakness of JPG is that it is lossy: every time you save a JPG, it loses a little quality, so always keep your original and only compress copies.

PNG — the right choice for sharp edges and transparency

PNG keeps every pixel exactly, so text, logos, line drawings and screenshots stay perfectly sharp. It also supports a transparent background, which JPG cannot do. The price is file size: a photo saved as PNG can be five to ten times bigger than the same photo as JPG. That is why you should never use PNG for a passport or exam photo — a PNG photo will almost never fit under a 20 KB or 50 KB limit.

WebP — the modern choice for the web

WebP is the newest of the three. For the same quality, a WebP file is usually 25–35% smaller than a JPG, and it supports transparency like PNG. It is the best format for websites, online shops and social media. But there is one catch: many government and exam forms do not accept WebP yet. Before you submit a form, check what it accepts — if it says JPG, give it a JPG.

How to convert between them

Open ResizeHub’s Format Converter, upload your image and pick the format you need. Converting a PNG photo to JPG is the fastest way to shrink a file that is too big for a form. Converting a JPG to WebP is the fastest way to make images load faster on a website. Converting never adds quality back — a blurry JPG stays blurry as a PNG — so always convert from the best original you have.

Common mistakes to avoid

Uploading a PNG photo to a 20 KB form — it will almost always be too big. Convert to JPG first.
Saving a JPG again and again — each save loses quality. Work from the original.
Sending WebP to a government form — check the accepted formats first, or the upload will fail.
Using JPG for a logo — the edges go fuzzy. Logos and text belong in PNG (or SVG).
Renaming a file to change its format — changing “.png” to “.jpg” in the file name does not convert the image. Use a real converter.

Remember it this way: photos go in JPG, sharp graphics go in PNG, and websites go in WebP — and when a form asks for a format, give it exactly that format. Your images are converted entirely in your browser and never uploaded anywhere.