Updated April 20, 2026 · 9 min read
Written by Muhammad Abdullah Rauf · Founder, EverydayTools.pro
Image format conversion is one of the most common file tasks online — converting iPhone HEIC photos to JPG, optimizing PNGs to WebP for web performance, or converting a logo to transparent PNG. In 2026 the key question is whether your images get uploaded to a third-party server, which matters for personal photos, client work, and confidential assets. This comparison covers the best free tools.
Top Free Image Converters Compared (2026)
| Tool | Privacy | Formats (Free) | HEIC Support | Batch | Signup |
|---|---|---|---|---|---|
| EverydayTools | ✓ No upload | JPG, PNG, WebP, GIF, BMP | No | Limited | No |
| Squoosh (Google) | ✓ No upload | JPG, PNG, WebP, AVIF, OxiPNG | No | 1 file at a time | No |
| Convertio | Server upload | 200+ formats | ✓ | 2 files free | No |
| CloudConvert | Server upload | 200+ formats | ✓ | 25 jobs/day free | No |
| ILoveIMG | Server upload | JPG, PNG, GIF, WebP | No | ✓ | No |
Reviews
1. EverydayTools — Best for Private Conversion
The EverydayTools Image Converter uses the browser's Canvas API to convert images in memory — no file is uploaded anywhere. It supports JPG, PNG, WebP, GIF, and BMP conversion in both directions. Quality is controlled by the browser's Canvas encoder. For personal photos, client assets, or any image you wouldn't want on a third-party server, this is the correct choice.
Best for: Converting personal photos, client images, confidential visual assets. Any JPG/PNG/WebP/GIF conversion where privacy matters.
Limitations: No HEIC support (requires server-side processing for HEIC decode). No RAW format support.
2. Squoosh — Best for Quality Control
Squoosh, developed by Google Chrome Labs (open source), is the most technically sophisticated browser-based image tool. It provides a side-by-side before/after preview with a draggable divider, real-time quality slider, and exact file size output. It supports MozJPEG (better JPEG compression than standard), WebP, AVIF, OxiPNG, and more via WebAssembly codecs.
Best for: Web developers optimizing images for Core Web Vitals, photographers choosing the right quality/size balance, and anyone who wants precise control over output quality.
3. Convertio — Best for HEIC and Exotic Formats
Convertio supports over 200 file formats including HEIC/HEIF (iPhone photos), RAW camera files (CR2, NEF, ARW), SVG, TIFF, and many others. HEIC conversion specifically requires server-side processing because browsers cannot natively decode the HEIC codec. If you need to convert iPhone photos in bulk, Convertio is the most practical free option (2 free conversions per upload session).
Best for: HEIC to JPG conversion (iPhone photos), RAW camera file conversion, and any format not supported by browser-based tools.
Limitations: Files are uploaded to Convertio's servers and deleted after 24 hours. Free tier processes 2 files per conversion. Not suitable for sensitive images.
Image Format Guide: When to Use Each
| Format | Best For | Compression | Transparency |
|---|---|---|---|
| JPEG / JPG | Photos, complex images | Lossy (adjustable quality) | No |
| PNG | Screenshots, logos, icons | Lossless | Yes (alpha channel) |
| WebP | Web images (replaces both JPG + PNG) | Lossy + lossless | Yes |
| AVIF | Next-gen web images, smaller than WebP | Lossy + lossless | Yes |
| GIF | Simple animations only | Lossless (256 colors only) | Yes (1-bit) |
| SVG | Logos, icons, UI elements (vector) | N/A (vector) | Yes |
| HEIC | iPhone photos (Apple ecosystem) | Better than JPEG | No |
| TIFF | Print, professional photography, archival | Lossless | Yes |