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

Published October 3, 2026 · By the ForgePDF team

Choosing an image format affects file size, quality and where the picture can be used. The three formats you meet most often on the web are JPG, PNG and WebP.

JPG: best for photographs

JPG uses lossy compression, discarding detail the eye barely notices to make photos small. It is ideal for photographs and gradients, but it does not support transparency, and text or sharp edges can show blurry artifacts at low quality. Repeated saving degrades the image further.

PNG: best for graphics and screenshots

PNG is lossless, so every pixel is preserved, and it supports transparency. That makes it a good fit for logos, icons, screenshots and images with text. The trade-off is size: a photo saved as PNG is usually much larger than the same photo as JPG.

WebP: a modern all-rounder

WebP can be lossy or lossless and supports transparency, and it usually produces smaller files than JPG or PNG at similar quality. It is supported by current versions of the major browsers, but some older software and upload forms still do not accept it.

How to choose

Use JPG for photos when compatibility matters, PNG for graphics that need transparency or crisp text, and WebP for websites where you want the smallest files. When unsure, keep the original and make a copy in the new format.

You can convert between all three with the Image Converter and tune file size with the Image Compressor. Both run in your browser, so your pictures stay on your device.

Related tools: Image Converter, Image Compressor

Compression and repeated saves

JPG is lossy, which means repeated editing and saving can introduce additional compression artifacts. If you need to create several versions of a photograph, keep a high-quality original and create each derivative from that source. PNG is lossless, so repeated saves do not introduce the same type of lossy degradation, although the file can be considerably larger for photographic content.

Transparency matters

Logos, icons, product cutouts, and interface graphics often need transparent backgrounds. Standard JPG cannot store transparency. PNG is a common choice, while WebP can also support transparency when the software and publishing system support it.

Choosing a format for PDFs

When preparing images for a PDF, the document workflow matters as much as the image format. A photograph may work well as JPG, while a screenshot containing small text may benefit from PNG. If you are converting images into a PDF, resize oversized photographs first and inspect the final pages for readable text.

Quick decision guide

• Photo: JPG or WebP.
• Screenshot or diagram: PNG is often a good starting point.
• Transparent logo: PNG or WebP.
• Modern website: Test WebP when supported.
• Maximum compatibility: JPG and PNG remain widely supported.

Practical checklist

Keep the original, complete one clear task at a time, and verify the result before sharing it. This makes document work easier to troubleshoot and reduces accidental data loss. For important files, use clear filenames for the original and the working copy so you always know which version is authoritative.

ForgePDF is intended for quick browser-based utility work. The best workflow is usually the shortest sequence that produces a correct, readable result. When a document is sensitive, also review the site's privacy information and your own device security.

There is also a practical compatibility question. A format can be technically efficient but inconvenient if the next application cannot open it. When a file will move through several systems, choose a format those systems reliably support. For a modern website, WebP can be tested alongside the existing JPG or PNG workflow.