Complete Guide to Image Conversion

Choosing the right image format can dramatically affect file size, quality, and compatibility. Here is a breakdown of every major format:

JPEG / JPG - Best for: Photographs, complex images with many colors - Compression: Lossy (reduces quality to shrink file size) - Supports transparency: No - Max colors: 16.7 million - Use when: Sharing photos online, email attachments, social media posts

PNG - Best for: Graphics with text, logos, screenshots, images needing transparency - Compression: Lossless (quality preserved) - Supports transparency: Yes (alpha channel) - Max colors: 16.7 million (PNG-24) or 256 (PNG-8) - Use when: Website graphics, icons, any image requiring a transparent background

WebP - Best for: Web images (developed by Google) - Compression: Both lossy and lossless - Supports transparency: Yes - Typical savings: 25-35% smaller than JPEG at equivalent quality - Use when: Building websites (supported by all modern browsers)

HEIC / HEIF - Best for: iPhone and iPad photos (Apple default since iOS 11) - Compression: Lossy, but better quality-to-size ratio than JPEG - Supports transparency: Yes - Issue: Poor compatibility outside Apple ecosystem - Use when: Storing photos on Apple devices; convert to JPEG/PNG for sharing

AVIF - Best for: Next-generation web format - Compression: Both lossy and lossless - Supports transparency: Yes - Typical savings: 50% smaller than JPEG, 20% smaller than WebP - Use when: Maximum compression is needed; browser support is growing

SVG - Best for: Logos, icons, illustrations, anything that needs to scale - Type: Vector (not raster) — defined by math, not pixels - Supports transparency: Yes - Use when: Any graphic that needs to look sharp at any size

Most online image converters work by uploading your files to a remote server, converting them there, and sending them back. This means your personal photos, sensitive documents, and private images pass through someone else is server.

Our tools are different. Every conversion happens entirely in your browser using JavaScript and WebAssembly. Your images never leave your device.

Why This Matters: - Medical images and personal health data stay private - Business documents and product photos remain confidential - Personal and family photos are never stored on unknown servers - No risk of data breaches exposing your images - Works offline once the page is loaded - No file size limits imposed by server upload restrictions

This client-side processing approach uses modern browser APIs like the Canvas API for format conversion and the File API for reading and saving files.

Large images are one of the biggest contributors to slow websites. Properly optimized images can reduce page load time by 50% or more.

Image Compressor Our Image Compressor reduces file size while maintaining visual quality. You control the quality slider to find the perfect balance.

Guidelines by Use Case: - Website hero images: Compress to 80-85% quality, target 200-500 KB - Blog post images: 75-80% quality, target 100-300 KB - Thumbnails: 70-75% quality, target 20-50 KB - Social media: 85-90% quality (platforms will recompress anyway) - Email: Keep under 1 MB total for all images in an email

Image Resizer Resizing is often even more effective than compression for reducing file size. A 4000x3000 photo does not need to be that large for web display.

Recommended Sizes: - Website banner: 1920x1080 or 1600x900 - Blog featured image: 1200x630 (also optimal for social sharing) - Thumbnail: 300x200 or 400x300 - Social media profile: 400x400 - Instagram post: 1080x1080

Converting HEIC to JPG If you transferred iPhone photos to a Windows PC, you have likely encountered HEIC files that will not open. Our HEIC to JPG converter handles this instantly in your browser.

Preparing Images for the Web The optimal workflow for web images: 1. Resize to the maximum display size (e.g., 1200px wide for blog images) 2. Convert to WebP for modern browsers (with JPEG fallback) 3. Compress to 80% quality 4. Use descriptive filenames for SEO (e.g., "blue-running-shoes.webp" not "IMG_4523.webp")

Format Conversion Cheat Sheet: - Photo for social media? -> JPEG at 85% quality - Logo or icon? -> SVG (vector) or PNG (raster with transparency) - Website background? -> WebP at 80% quality - Print? -> PNG or TIFF at full resolution - Archive/storage? -> Original format or PNG (lossless) - Email attachment? -> JPEG, compressed to under 1 MB