Image Formats Explained: JPG, PNG, WebP, GIF, and BMP

Choosing the right image format can mean the difference between a crisp, fast-loading website and a blurry, slow one. Each format has strengths and trade-offs. This guide explains when to use each one and how to convert between them.

Quick comparison

JPG (JPEG)

Joint Photographic Experts Group — the default format for digital photography.

Strengths

• Excellent compression for photos (5-10x smaller than uncompressed).
• Universal support — every device, browser, and application opens JPGs.
• Adjustable quality slider lets you balance size vs. quality.

Weaknesses

• Lossy. Each save degrades quality slightly. Editing and re-saving a JPG multiple times introduces visible artefacts.
• No transparency. Transparent areas become white.
• Poor for text and edges. Compression creates visible smearing around sharp edges.

Use for

Photos, camera images, scanned documents, social media uploads, and any image where small file size matters more than pixel-perfect accuracy.

PNG

Portable Network Graphics — the format for sharp, transparent images.

Strengths

• Lossless. No quality loss, ever. The image you save is identical to the original.
• Full transparency. 8-bit alpha channel supports smooth, graduated transparency.
• Sharp edges. Perfect for text, logos, screenshots, and diagrams.

Weaknesses

• Larger files. A PNG photo is typically 3-5x larger than the same image as a JPG.
• Not ideal for photos. The lossless approach does not take advantage of photographic redundancy.

Use for

Screenshots, logos, icons, diagrams, images with text, images requiring transparency, and anything where quality is non-negotiable.

Convert between formats: PNG to PDF or use Convert to JPG to switch from PNG to JPG.

WebP

Web Picture — Google's modern format designed for the web.

Strengths

• Best compression. 25-35% smaller than JPG at the same visual quality.
• Supports both lossy and lossless compression in a single format.
• Supports transparency (like PNG) and animation (like GIF).

Weaknesses

• Browser support. Modern browsers (Chrome, Firefox, Edge, Safari 14+) support WebP. Older browsers do not.
• Limited desktop software support. Some image editors and older applications cannot open WebP files.

Use for

Website images, web applications, and anywhere you need the smallest file size with maximum quality.

GIF

Graphics Interchange Format — the original animated image format.

Strengths

• Animation. GIF is still the most widely supported animated image format.
• Simple transparency. Supports 1-bit (on/off) transparency.
• Universal support. Every browser and messaging app supports GIF.

Weaknesses

• 256-colour limit. GIF supports only 256 colours, making photos look posterised and banded.
• Large animated files. A 5-second GIF can easily exceed 10 MB.
• Poor photo quality. The colour limitation makes GIF unsuitable for photographic content.

Use for

Simple animations, reaction images, and icons with a limited colour palette. For complex animations, modern formats (WebP, APNG, or MP4 video) are better.

BMP

Bitmap — the uncompressed raw image format.

Strengths

• No compression artefacts. The image is stored pixel-by-pixel with no quality loss.
• Simple format. Easy to read and write programmatically.

Weaknesses

• Enormous file sizes. A 1920x1080 image at 24-bit colour is about 6 MB as BMP vs. 200 KB as JPG.
• No transparency. No alpha channel support.
• Legacy format. Rarely used outside Windows or specialised workflows.

Use for

Almost never in modern workflows. BMP files should typically be converted to PNG (for lossless) or JPG (for photos) before sharing.

How to choose the right format

1. Is it a photo? → JPG (or WebP for the web)
2. Does it need transparency? → PNG (or WebP)
3. Is it a screenshot or diagram? → PNG
4. Is it animated? → GIF (simple) or WebP/MP4 (complex)
5. Is it for the web and you want maximum performance? → WebP

Converting between formats

Frequently asked questions

Can I convert between image formats without quality loss?

Converting from a lossless format (PNG, BMP) to another lossless format (PNG) is lossless. Converting to a lossy format (JPG) always involves some quality loss. Converting from JPG to PNG does not improve quality — it just prevents further degradation.

Which format has the smallest file size?

For photos: WebP > JPG > PNG > BMP. For graphics with sharp edges: WebP > PNG > JPG.

Does the format matter for PDF conversion?

Not much. The Image to PDF converter accepts all formats and embeds the image at its original quality regardless of format.

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Image tools: Compress Image, Resize Image, Remove Background, or browse all converters.