August 16, 2026
JPG vs PNG vs WebP vs AVIF: Which Image Format Should You Use?
Four formats dominate the web today — JPG, PNG, WebP, and AVIF — and picking the wrong one is the single most common reason websites ship bigger images than they need to. The right answer depends on what's in the image, where it's being shown, and whether your audience's browsers all support the newer codecs. This guide gives you a side-by-side comparison and a use-case rulebook you can apply in seconds.
The 30-second comparison
Before the deep dive, here is the table. Keep it open next time you have to pick a format for a folder of assets.
| Format | Best for | Transparency | Animation | File size at equal quality | Browser support (2026) |
|---|---|---|---|---|---|
| JPG / JPEG | Photographs | No | No | Baseline (largest) | Universal — every browser, every device |
| PNG | Graphics, screenshots, transparency | Yes (alpha) | No (use APNG) | Large for photos, small for line art | Universal |
| WebP | All-purpose replacement for JPG and PNG | Yes (alpha) | Yes | ~25–35% smaller than JPG at equal quality | ~97% of users (all modern browsers) |
| AVIF | Smallest possible files at high quality | Yes (alpha) | Yes | ~50% smaller than JPG at equal quality | ~95% of users (all modern browsers since 2023) |
JPG: the universal baseline
JPG (JPEG) has been the dominant photo format since the early 1990s. It uses a lossy compression pipeline that excels at photographs with continuous tones, smooth gradients, and natural color variation. Every browser, every device, every email client, every chat app opens it. JPG is the safe default for photographs when compatibility matters more than file size.
JPG's weaknesses are well-known: it does not support transparency, it does not support animation, and it loses a small amount of detail every time you re-save the file. It also bloats quickly at high quality settings — a quality 95 JPG is often only marginally smaller than the same image as a quality 80 WebP.
PNG: the pixel-perfect workhorse
PNG is lossless, supports full alpha-channel transparency, and is the right format for screenshots, UI captures, logos, icons, and any image where sharp edges and exact colors must survive a round trip. PNG was designed for graphics, and it shows: it produces small files for line art and UI screenshots, and enormous files for photographs. A 4000×3000 phone photo saved as PNG can weigh 20 MB; the same image saved as JPG is closer to 3 MB.
APNG (Animated PNG) is an underused extension that adds animation without the quality loss of GIF, but most chat apps and CMS platforms still strip it on upload.
WebP: the all-purpose replacement
WebP was developed by Google as a single format that can replace both JPG and PNG. It supports lossy and lossless modes, transparency, and animation. At equivalent visual quality, a WebP file is typically 25 to 35 percent smaller than the same JPG, and a WebP lossless file is typically noticeably smaller than the same PNG.
WebP has had near-universal browser support since 2020 and is now the de facto web default for new projects. The only places you should still ship JPG or PNG are user-generated content forms that reject WebP, email clients with stale preview renderers, and print pipelines.
AVIF: the smallest file at the highest quality
AVIF is built on the AV1 video codec and produces the smallest files of any widely-supported format — typically about half the size of a JPG at the same visual quality, with full support for transparency and animation. It excels at preserving fine detail in complex textures (skin, fabric, foliage) at low bitrates, which is where JPG struggles the most.
AVIF encode is slower than WebP or JPG, which is why it isn't used more on the open web — servers can't generate AVIF on the fly as cheaply as they can WebP. For one-off conversions where the encode cost doesn't recur, AVIF is excellent. For dynamic image processing at scale, WebP is usually still the better trade.
Which format should you actually use?
Here is the rulebook most performance teams apply:
- Photos on the web. WebP at quality 75–80. If you can serve AVIF and have the encode budget, do that as the primary and WebP as the fallback via the
<picture>element. - Logos and icons. PNG if you need transparency and maximum compatibility. SVG if the source is vector — it's dramatically smaller and scales without artifacts. WebP lossless if you can ship a single raster asset.
- Screenshots and UI captures. PNG for pixel-perfect clarity, WebP lossless for the same image at 30–40% fewer bytes.
- Email and chat attachments. JPG for photos (universal rendering), PNG for screenshots and graphics with transparency. Don't ship WebP to email — many email clients still render it as a download attachment rather than an inline image.
- Social media uploads. JPG for photos (Instagram, Facebook, LinkedIn and X all re-encode your upload anyway, so start with a quality 85 JPG and let them do the rest). PNG only when you genuinely need transparency.
- Animations. WebP or AVIF. GIF is still universal but produces files 3–10× larger at lower visual quality.
How to convert without losing quality
When you re-encode an image, you are compressing it twice — once by the original camera or designer, once by the conversion tool. To keep the second pass invisible, follow the same three rules as any compression job: resize to the target display size first, set the output quality in the 75–80 range (or its WebP/AVIF equivalent), and strip metadata you don't need. Re-encoding a 95-quality JPG into an 85-quality JPG won't save you many bytes and will compound artifacts; re-encoding it to a 75-quality WebP will.
ImagElite's image converter handles all four formats in both directions and shows you the resulting file size before you download. You can convert a folder of legacy assets from JPG to WebP, PNG to AVIF, or anything in between in a single batch, with side-by-side previews so the quality trade-off is visible before you commit.