Simple Online Image Converter

Convert images instantly with ImgTool.app. Free online image converter that works 100% locally in your browser. Convert JPG, PNG, GIF, WebP, HEIC, and to next-gen formats like AVIF without losing quality. Perfect for web optimization and format changes.

Upload Image

Drop, select, or paste an image to start.

  • Local processing for privacy
  • Format support
  • Quality control
  • Multi-input support
  • Next-gen formats
  • Free & no account needed

Key Features of Our Free Online Image Converter Tool

Local Processing

All conversion happens in your browser—no uploads, ensuring privacy and speed.

Format Support

Convert between JPG, PNG, WebP, AVIF, and more.

Quality Control

Adjust output quality for lossy formats like JPG, WebP, and AVIF.

Multi-Input Support

Handle JPG, PNG, GIF, WebP, and HEIC inputs.

Next-Gen Formats

Support for efficient formats like AVIF for better compression.

Free & No Account Needed

Completely free online tool with no sign-up required.

Why Choose ImgTool.app for Converting Images Online?

ImgTool.app is a simple, free image converter tool that processes everything client-side for maximum privacy. Whether you're converting photos for web use, compatibility, or optimization, our online image converter helps you switch formats quickly without uploading your files.

Combine with our image resizer, cropper, or compressor for a full editing workflow. For bulk processing, try the bulk resizer. All tools run locally in your browser.

Tips for Converting Images to AVIF

AVIF offers superior compression for web images. Use 80–90% quality for best results. Note: AVIF export requires a modern browser.

Image Converter FAQ

Upload your image, choose the output format, adjust quality if needed, and download the converted image—all locally in your browser.

Yes, 100% free with no account needed. Your images never leave your device.

Input: JPG, PNG, GIF, WebP, HEIC. Output: JPG, PNG, WebP, AVIF, and (where supported) BMP.

Yes, convert to AVIF for better compression and efficiency, supported in modern browsers.

Absolutely, the tool is fully responsive and works on desktops, tablets, and mobiles.