# Image Format Converter

Canonical URL: https://offlineutils.com/image-converter
Category: Media & Design
Published: 2026-06-24
Publisher: offlineutils.com
Runs entirely in the browser; nothing entered into the tool is uploaded.

> An Image Format Converter transcodes one or more images between PNG, JPEG, and WebP formats using the HTML5 canvas API — including a quality slider for lossy formats — all client-side with no upload.

Drop a single image or a folder of them. Pick the target format and quality (for JPEG/WebP). Each image is decoded, drawn to a canvas, and re-encoded via canvas.toBlob in your browser. Download files individually or as a ZIP. WebP typically yields 25–35% smaller files than equivalent JPEG with better quality, which is why Google recommends it for the web.

## Features

- Convert between PNG, JPEG, and WebP
- Per-image quality slider for lossy formats
- Bulk drag-and-drop a whole folder of images
- Download individually or as a single ZIP
- Powered by canvas.toBlob — every file converts in-browser

## Use cases

- Converting a folder of PNG screenshots to WebP for a smaller commit
- Producing JPEG copies of WebP files for systems that do not render WebP
- Standardizing a mixed-format upload to a single format before processing
- Shrinking a batch of design exports for an email send

## How to use it

1. **Drop your images** — Drag and drop one file or a whole folder.
2. **Pick target format** — Choose PNG, JPEG, or WebP. Tune quality if the format is lossy.
3. **Download** — Download each result individually or grab them as a ZIP.

## When to use it, and when to use something else

- **vs ImageMagick `mogrify`** — use Image Format Converter when you want a paste-and-go UI in the browser. Use ImageMagick `mogrify` when you are scripting.
- **vs squoosh.app** — use Image Format Converter when you want bulk conversion of many files at once. Use squoosh.app when you want fine codec-level tuning on a single image.

## Frequently asked questions

### Which format should I pick?

WebP for the web — smaller files at equal quality, supported in every modern browser. JPEG for compatibility with older systems. PNG when you need lossless or transparency.

### Does quality matter for PNG?

No. PNG is lossless — the slider only affects JPEG and WebP output.

### Can I convert HEIC photos?

Only on browsers that decode HEIC natively (Safari does; most others don't yet). For non-Safari users, convert HEIC to JPEG first on the device.

## Related tools

- https://offlineutils.com/image-resizer
- https://offlineutils.com/exif-stripper
- https://offlineutils.com/images-to-pdf