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Zero Privacy Concerns.
100% client-side processing. Your images never leave your device.
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Popular Conversion Tools
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HEIC to JPG
iPhone photos
Convert iPhone HEIC photos to JPG for universal compatibility
HEIC to PNG
iPhone photos
Convert iPhone HEIC photos to PNG with lossless quality
WebP to PNG
Web images
Convert modern WebP images to PNG with transparency support
WebP to JPG
Web images
Convert WebP images to JPG for older devices and apps
PNG to JPG
Reduce file size
Convert PNG to JPG to reduce file size for faster sharing
JPG to PNG
Add transparency
Convert JPG to PNG for editing and transparency support
All Formats
Universal converter
Convert between any image formats in one powerful tool
Why ConvertFast?
The fastest, most private way to convert images
Lightning Fast
No upload delays. Conversions happen instantly in your browser.
100% Private
Client-side processing means your images never leave your device.
Unlimited
No file limits or conversion caps. Convert as many images as you need.
Batch Processing
Convert up to 100 images at once. Download individually or as ZIP.
How It Works
Three simple steps to convert your images
Upload Images
Drag & drop your images or click to browse. Supports batch uploads.
Choose Format
Select your output format or use a dedicated conversion tool.
Download Instantly
Get your converted images immediately. Download as ZIP or individually.
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All tools feature client-side processing for maximum privacy and security
Learn More About Image Conversion
Expert guides and tutorials on image formats and conversion techniques
Important Note
For Informational Purposes Only
This tool processes images directly in your browser for maximum privacy. The conversion results are provided for informational purposes only and should not be considered professional advice. Please be aware:
- Very large images (over 50MB) may take longer to process on older devices
- Browser memory limitations may affect batch processing on mobile devices
- HEIC conversion requires WebAssembly support (available in modern browsers)
- Image quality settings affect file size - experiment to find your ideal balance
- Always verify converted images meet your requirements before use in production
Privacy: All conversions happen locally in your browser. No images are uploaded to our servers.
Frequently Asked Questions
What is HEIC format and why can't I open iPhone photos?
HEIC (High Efficiency Image Container) is Apple's default photo format for iPhones since iOS 11. It offers better compression than JPG but isn't widely supported on Windows or older devices. Converting HEIC to JPG makes your iPhone photos compatible with any device or application.
Is it safe to convert images online?
With ConvertFast, absolutely! Unlike other online converters that upload your images to their servers, we use 100% client-side processing. Your images are converted directly in your browser using JavaScript and never leave your device. No server, no upload, no privacy concerns.
How does client-side conversion work?
ConvertFast uses the HTML5 Canvas API and WebAssembly (for HEIC files) to process images directly in your web browser. When you upload a file, it's read into your browser's memory, converted to your chosen format, and made available for download—all without ever touching our servers. This makes conversions faster, more secure, and completely private.
What's the maximum file size?
Since conversion happens in your browser, file size limits depend on your device's available memory. Most modern devices can handle images up to 50MB without issues. For batch conversions, you can convert up to 100 images at once. There are no artificial limits or subscription tiers—everything is free and unlimited.