Convert Images Instantly.
Zero Privacy Concerns.
100% client-side processing. Your images never leave your device.
Need to turn your converted visuals into polished slides? Try PresentForge for lightning-fast presentation creation.
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Popular Conversion Tools
Choose your conversion type and get started instantly
iPhone photos
Convert iPhone HEIC photos to JPG for universal compatibility
Lossless quality
Convert iPhone HEIC photos to PNG with lossless quality
Transparency support
Convert modern WebP images to PNG with transparency support
Universal compatibility
Convert WebP images to JPG for older devices and apps
Smaller file size
Convert PNG to JPG to reduce file size for faster sharing
Add transparency
Convert JPG to PNG for editing and transparency support
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.
See It In Action
Watch how easy it is to convert your images
Upload Images
Drag & drop or click to select
Choose Format
Select output format & convert
Conversion Complete!
Download Instantly
Get your converted images
Try It Out with Sample Images
No images handy? Download these sample images to test the converter instantly
Sample Landscape
1920×1440 • PNG format
Sample Portrait
1080×1440 • PNG format
Sample Square
1200×1200 • PNG format
Download any sample image and try converting it to JPG, WebP, or any other format
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.
Which browsers are supported?
ConvertFast works on all modern browsers including Chrome, Firefox, Safari, and Edge. For HEIC conversion, your browser needs WebAssembly support (available in all browsers from 2017 onwards). Mobile browsers like iOS Safari and Android Chrome are fully supported. Internet Explorer is not supported.
What image formats can I convert?
We support all major image formats: HEIC (iPhone photos), WebP, PNG, JPG/JPEG, BMP, GIF, TIFF, and ICO. You can convert from any supported format to any other format. Our universal converter tool supports over 20 different image format combinations.
Will converting affect my image quality?
Quality depends on the output format and settings you choose. Converting to PNG preserves 100% of the original quality (lossless). Converting to JPG or WebP uses compression, and you can adjust the quality slider (1-100%) to balance file size vs. quality. Higher quality = larger files. We recommend 85-95% for photos and 100% for graphics with text.
How do I convert multiple images at once?
Simply drag and drop multiple images (or click to select multiple files) into the converter. You can convert up to 100 images at once. All images will be converted with the same settings. After conversion, you can download them individually or click "Download All as ZIP" to get everything in one archive file.
Why is my image file size larger after conversion?
File size increases usually happen when converting from a compressed format (JPG, WebP) to an uncompressed format (PNG, BMP). PNG preserves all image data without compression, resulting in larger but higher-quality files. To reduce size, try converting to JPG or WebP with quality set to 80-90%, or enable the resize option to reduce dimensions.
Can I use this on my phone or tablet?
Yes! ConvertFast is fully optimized for mobile devices. You can convert images directly from your iPhone, iPad, or Android device. The interface adapts to smaller screens, and you can easily select photos from your photo library. Processing happens right on your device, so it works even with slow internet connections. If you need to turn your freshly converted visuals into polished slides while you're on the go, try PresentForge for lightning-fast presentation creation.