Image Converter
Bulk convert images (PNG, JPG, WEBP, AVIF, HEIC) locally with professional quality and alpha preservation.
Choosing the Right Image Format
Overview
Image format choice affects file size, quality, browser support, and use case. JPEG excels at photographs but loses quality on each save. PNG handles transparency and crisp edges (logos, screenshots) but produces larger files. WebP and AVIF are modern formats that compress 25–50% better than JPEG/PNG with comparable quality — both have universal browser support as of 2025. HEIC is iPhone's default but has limited web compatibility. This converter handles all major formats, processing entirely in your browser without uploading anywhere.
How to Use (Step by Step)
- 1
Drop your image
Any common format: JPG, PNG, WebP, AVIF, HEIC, GIF. Multiple files at once work too. Nothing uploads — the conversion happens in your browser.
- 2
Pick the target format
WebP and AVIF give better compression than JPG at the same quality. PNG keeps transparency. JPG is the safe universal fallback.
- 3
Download the converted file
Quality slider trades file size against visual fidelity. For web use, 75–85% quality is usually invisible to the eye and dramatically smaller.
How It Works
The converter uses the HTML5 Canvas API to decode the source image, then re-encodes to the target format using browser-native codecs. Quality settings (for lossy formats) range from 0.1 (lowest) to 1.0 (highest). For batch conversions, files process one at a time to manage memory. HEIC inputs use the heic2any library because most browsers can't natively decode HEIC. Everything runs locally — your images never reach a server.
When to Use This
Convert iPhone HEIC photos to JPEG for cross-platform sharing. Compress large PNG screenshots to WebP for faster website loading. Convert RAW or TIFF originals to web-friendly JPEG. Standardize a folder of mixed formats to one format before uploading to a service with format restrictions. Reduce file sizes for email attachments (PDF size limits often hit when images are too large).
Frequently Asked Questions
AVIF for photos (best compression, supported in all modern browsers), WebP for general use (slightly worse than AVIF but lighter encoder), JPEG for maximum compatibility (some old systems and Word documents still prefer it).