JPEG vs PNG vs WebP vs AVIF: Which Format Should You Use?

Picking an image format feels like a small decision, but it affects how fast your pages load, how crisp they look, and whether they work in a given app or browser. Here is a straight comparison of the four formats you will meet most often.

The quick answer

• Photographs: WebP or AVIF, with JPEG as a fallback.
• Screenshots, logos, icons, line art: PNG.
• Transparency plus photos: WebP or PNG.
• Maximum compatibility above all: JPEG.
• Best modern efficiency and you control the delivery: AVIF.

JPEG — the universal workhorse

Introduced in 1992, JPEG is still the most widely supported photo format in the world.

Strengths

• Works literally everywhere.
• Excellent at compressing photographs with smooth gradients.
• Small files at moderate quality.

Weaknesses

• Lossy only; it cannot store transparency.
• Text and sharp edges get fuzzy.
• It does not support animation.

Use JPEG when you need a photo to open on any device or app without thinking about it, and when a small amount of quality loss is acceptable.

PNG — sharp, lossless, transparent

PNG was designed for the web and handles the cases JPEG cannot.

Strengths

• Lossless, so it preserves exact pixels.
• Full alpha-channel transparency.
• Perfect for screenshots, charts, logos, and images with text.

Weaknesses

• Much larger files for photographs.
• No quality dial — you get lossless or nothing.

Use PNG when sharpness and transparency matter more than file size. Photographs saved as PNG are usually a waste of bandwidth.

WebP — the modern default

WebP, developed by Google, supports both lossy and lossless compression and transparency and animation all in one format.

Strengths

• Typically 25–35% smaller than an equivalent JPEG.
• Supports transparency and animation.
• Broad support in current browsers.

Weaknesses

• Older software and some desktop apps still do not open it.
• Maximum efficiency is slightly behind AVIF for photos.

Use WebP as the default for web images today, keeping a JPEG fallback only when you must support very old clients.

AVIF — the newest and smallest

AVIF is based on the AV1 video codec and delivers the best compression of the group.

Strengths

• Often 40–50% smaller than JPEG at similar quality.
• Supports transparency, wide color, and high dynamic range.

Weaknesses

• The newest format, so support, though good, is less universal than WebP.
• Encoding can be slower and heavier.

Use AVIF when you want the smallest possible files and you can generate a fallback or your audience uses modern browsers.

Side-by-side

Format	Compression	Transparency	Animation	Best for
JPEG	Lossy	No	No	Photos, maximum compatibility
PNG	Lossless	Yes	No*	Screenshots, logos, graphics
WebP	Both	Yes	Yes	General web images
AVIF	Both	Yes	Yes	Smallest modern files

*PNG has APNG animation, but it is far less common than GIF or WebP animation.

How to choose in ten seconds

1. Is it a photograph? → WebP (fallback: JPEG).
2. Is it a screenshot, logo, or graphic with text? → PNG.
3. Do you need transparency on a photo? → WebP (fallback: PNG).
4. Is every kilobyte precious and your audience modern? → AVIF.
5. Must it open in literally anything? → JPEG.

Converting between formats

Conversion is straightforward when the formats are supported by your browser. Keep two rules in mind:

• Converting a JPEG to PNG does not recover lost detail. It only changes the container; the compression artifacts remain.
• Converting PNG to JPEG flattens transparency to a solid color (often white or black), so check the result if your image has a transparent background.

You can try any of these conversions with the Imgsprint image converter, which runs locally in your browser and warns you if a target format is not supported by your device.

Format is only half the job

Whichever format you choose, resize the image to the dimensions it will actually be displayed at, and strip unnecessary metadata before publishing. The right format at the wrong size will still be slow; the right format at the right size will feel instant.