7 Best Free Online Image Converters

For quick, private conversion of JPG, PNG, WebP, and AVIF — use a browser-based tool like OnlineConvert or Squoosh. Your files stay on your device.

For rare formats (TIFF, BMP, HEIC, RAW) or very large batches — use a server-based tool like CloudConvert or Convertio. They handle more formats but require uploading your files.

For developers and power users — ImageMagick or FFmpeg give you full control from the command line.

OnlineConvert converts between JPG, PNG, WebP, and AVIF entirely in your browser. Files never leave your device — processing uses Web Workers for parallel conversion. It also includes image editing (crop, resize, rotate, flip) and compression tools.

Best for: Anyone who wants fast, private image conversion with batch support and doesn't need exotic formats. Particularly good for sensitive images you don't want on third-party servers.

Squoosh is Google's open-source image compression tool. Its standout feature is a side-by-side visual comparison slider that shows exactly how compression affects quality. It runs entirely in the browser using WebAssembly.

Best for: Fine-tuning compression quality on individual images. The visual comparison slider is unmatched for seeing exactly what you're trading away at each quality level.

CloudConvert supports over 200 file formats — not just images, but documents, videos, and more. Files are uploaded to their servers in Germany (GDPR-compliant) and deleted after processing.

Best for: Converting uncommon formats (HEIC from iPhones, TIFF from scanners, RAW from cameras) or when you need an API for automated workflows.

Convertio is a general-purpose file converter with a clean interface. It supports 100+ image formats and also handles documents, audio, and video. Files are uploaded for processing.

Best for: One-off conversions of unusual formats when you don't want to install anything. The cloud storage integration is useful if your files are already in Google Drive.

iLoveIMG is part of the iLovePDF family of tools. It combines conversion with a suite of editing features — compress, resize, crop, watermark, and more. Files are uploaded to their servers.

Best for: Users who need a one-stop shop for image conversion plus editing, and don't mind the server upload tradeoff.

ImageMagick is the gold standard for command-line image processing. It supports 200+ formats, handles complex transformations, and can be scripted for automated pipelines. Free, open source, and runs on every OS.

Best for: Developers who need to automate image processing in scripts, CI/CD pipelines, or server-side workflows. The tool of choice when you need full control.

FFmpeg is primarily a video tool, but it's also excellent for image conversion — especially for extracting frames from video, handling animated formats, and AVIF encoding via libavif. It uses the same AV1 encoder under the hood as many dedicated AVIF tools.

Best for: Developers working with video or animated images, or anyone who needs high-quality AVIF encoding with fine-grained control over encoder settings.

The biggest difference between these tools isn't features — it's where your files go.

Browser-based tools (OnlineConvert, Squoosh) process everything locally. Your images never leave your computer. This matters for personal photos, medical images, legal documents, or anything you wouldn't want on someone else's server.

Server-based tools (CloudConvert, Convertio, iLoveIMG) upload your files for processing. They typically delete files after a few hours, but your images do pass through third-party infrastructure. Check each tool's privacy policy if this matters to you.