Best Free Image Converters

BY TOOLS.FUN · MARCH 28, 2026 · 4 min read

Image format conversion is one of those tasks that should be simple but often is not. Between HEIC files from iPhones, WebP from modern browsers, and legacy JPEG requirements, you need a reliable converter that works without installing software. Here are the best free options and when to use each format.

jpg.now — Instant JPEG Conversion

jpg.now converts PNG, WebP, BMP, and other formats to JPEG directly in your browser. The conversion happens client-side, so your images never leave your device. It handles transparency by compositing onto a white background (configurable) and lets you set the quality slider to balance file size against visual fidelity.

This is the fastest option when you need a quick JPEG for email, a form upload that only accepts JPG, or a social media post that rejects other formats.

heic.now — Solve the iPhone Problem

Apple devices shoot in HEIC (High Efficiency Image Container) by default. While the format produces excellent quality at small file sizes, most Windows applications, web forms, and CMS platforms do not accept it. heic.now converts HEIC and HEIF files to JPEG or PNG in your browser with no upload to a server.

The conversion preserves EXIF metadata (camera, date, GPS) unless you choose to strip it — useful for privacy when sharing photos publicly.

Tip: On iPhone, you can change the default camera format to JPEG in Settings > Camera > Formats > Most Compatible. This avoids the HEIC conversion step entirely, though your photos will take up more storage space.

WebP Conversion — The Modern Web Format

WebP offers 25-35% smaller file sizes than JPEG at equivalent visual quality, and it supports transparency (unlike JPEG). Most online converters now handle WebP in both directions. To convert to WebP, tools like Squoosh (by Google) give you real-time quality previews with a before/after slider.

For website images, WebP is the recommended format in 2026 — every major browser supports it, and the file size savings directly improve Core Web Vitals scores.

Batch Conversion Tips

When you have dozens of images to convert, browser-based tools can be tedious. For batch work, consider these approaches:

Command line: ImageMagick's mogrify command converts entire folders in one command. Example: mogrify -format webp -quality 80 *.png converts all PNGs to WebP.

Desktop apps: XnConvert (free) handles batch conversion with a visual interface, supporting over 500 formats and customizable output settings.

Build tools: For web projects, integrate image conversion into your build pipeline using sharp (Node.js) or Pillow (Python). This ensures all images are optimised automatically on every deploy.

Quality guide: For photographs, JPEG quality 80-85 or WebP quality 75-80 is the sweet spot — visually indistinguishable from the original but significantly smaller. For screenshots and text-heavy images, use PNG for lossless quality.

Choosing the Right Format

JPEG: Best for photographs and complex images with gradients. Universal compatibility. No transparency support.

PNG: Best for screenshots, logos, and images requiring transparency. Lossless quality but larger file sizes.

WebP: Best for web content — combines the strengths of JPEG and PNG with smaller files. Use as your default web format.

AVIF: The newest option with even better compression than WebP. Browser support is now widespread but not quite universal. Consider offering AVIF with a WebP fallback using the HTML <picture> element.

For quick format identification and metadata inspection, paste image data into the Base64 tool to examine headers, or use the JSON Formatter to parse image metadata API responses.

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