5 Best Free Online Image Converter Tools in 2025
Whether you just bought a new iPhone (which saves photos as HEIC) or received a WebP file that won't open in your editing software, you need a reliable image converter. Most tools are paid, full of ads, or require you to create an account just to download your file.
We tested over a dozen tools and shortlisted the five that are genuinely free, fast, and work without any friction. Here's what we found.
Quick comparison: top 5 image converters
| Tool | No signup | HEIC support | Bulk convert | No watermark |
|---|---|---|---|---|
| ConvertLinx | ✓ | ✓ | ✓ | ✓ |
| CloudConvert | ✗ | ✓ | ✓ | ✓ |
| Squoosh | ✓ | ✗ | ✗ | ✓ |
| iLoveIMG | ✓ | ✗ | ✓ | ✓ |
| Convertio | ✗ | ✓ | ✗ | ✗ |
1. ConvertLinx — Best overall free image converter
ConvertLinx.com
ConvertLinx is a clean, fast utility tools platform with 10+ image tools — HEIC to JPG, image compression, format conversion, and cropping — all without creating an account. Files are processed client-side where possible, so your images never leave your device unnecessarily.
Try ConvertLinx Free →What makes ConvertLinx stand out is the breadth of tools in one place. Most free converters do one thing — ConvertLinx covers image conversion, compression, and cropping all together. Especially useful if you're processing iPhone photos that need to go from HEIC → JPG → compressed for web.
Pro tip: If your images need to become a PDF at the end of the workflow, convert them first on ConvertLinx, then use PDFLinx's Image to PDF tool to finish the job.
2. CloudConvert — Best for rare formats
CloudConvert
Supports 200+ formats including TIFF, RAW, and obscure image types. The right choice when ConvertLinx doesn't support your specific format. The downside: a free account is required for extended usage beyond a few conversions per day.
3. Squoosh — Best for compression
Squoosh by Google
Built by Google Chrome Labs, Squoosh runs entirely in the browser using WebAssembly. It's a compression specialist — not really a format converter — but excellent for shrinking PNG or JPG files for web use with precise quality control and a live side-by-side preview.
4. iLoveIMG — Best for batch operations
iLoveIMG
The image counterpart to iLovePDF. Handles bulk operations well — resize, compress, convert, crop, and watermark multiple images at once. The free tier is generous but has a file size limit per conversion.
5. Convertio — Best for cloud storage integration
Convertio
Lets you import directly from Google Drive and Dropbox — handy if your images are already in the cloud. Free tier is limited to 2 conversions per day and requires signup.
Frequently asked questions
ConvertLinx.com is our top pick for 2025. No signup, supports HEIC, WebP, PNG, JPG, and processes files without adding watermarks.
Yes. ConvertLinx has a dedicated HEIC to JPG converter that works entirely in the browser — no download needed.
Convert your image to JPG first on ConvertLinx (if it's HEIC or WebP), then use PDFLinx's free Image to PDF tool to turn it into a PDF in seconds.
Reputable tools like ConvertLinx and PDFLinx either process files locally in the browser or delete uploaded files from servers immediately after conversion. Always check the privacy policy of any tool you use.
Conversion changes the file format (e.g. HEIC → JPG). Compression reduces file size while keeping the same format. Tools like ConvertLinx do both — you can convert and compress in one step.
Need PDF tools instead?
Compress, convert, merge PDFs — all free on PDFLinx. No signup needed.
Compress PDF Image to PDF All PDF Tools →