🖼️ Free Image Converter Tools
Convert, compress and resize images — all in your browser. No upload, no account, no limits.
All Image Tools
Crop Image
Cut to any size or ratio
SVG to PNG
Rasterise at any resolution
Rotate & Flip
Turn 90° at a time or mirror
Favicon Generator
Every size browsers need
Image to Base64
Data URI for CSS and HTML
JPG to PNG
Convert JPEG images to PNG format with transparency support. Free and instant.
PNG to JPG
Convert PNG images to JPEG format. Adjust quality to balance size and sharpness.
WebP to JPG
Convert WebP images to universally compatible JPG format instantly.
WebP to PNG
Convert WebP to PNG with the alpha channel preserved, so cut-outs stay cut out.
Compress Image
Reduce image file size without visible quality loss. Perfect for web and email.
Resize Image
Resize images by exact pixels or percentage. Lock aspect ratio to avoid distortion.
HEIC to JPG
Convert iPhone HEIC photos to JPG format, compatible with all devices and apps.
JPG to WebP
Convert JPG to WebP for 25-35% smaller file sizes. Modern web format, all browsers supported.
PNG to WebP
Convert PNG to WebP — supports transparency, dramatically smaller files for the web.
Choosing the Right Image Format
Three formats cover almost everything, and the choice follows from the content rather than from any general ranking. JPEG is built for photographs: its compression discards detail your eye is unlikely to miss, which works beautifully on natural texture and gradual gradients and badly on sharp edges. It has no transparency. PNG is lossless and supports an alpha channel, making it correct for screenshots, logos, diagrams, line art and anything with flat colour or hard edges — but on a photograph it produces a file several times the size of an equivalent JPEG. WebP covers both cases, with a lossy mode that beats JPEG by roughly 25–35% at matched quality and a lossless mode that beats PNG by 20–30%, and it keeps transparency in both.
The practical rule: photographs go to JPEG or lossy WebP, graphics and screenshots to PNG or lossless WebP, and anything needing transparency avoids JPEG entirely. WebP is the better technical choice for the web today, since browser support has been universal for years; the reason to keep JPEG and PNG around is everything that is not a browser — older desktop software, print workflows, upload forms and devices that still reject the format.
One principle applies across every conversion here: lossy compression is not reversible. Converting a JPEG to PNG stores its existing artefacts losslessly but cannot remove them, and each lossy re-encode adds a new generation of loss on top of the last. Keep the highest-quality original you have as your master and treat every converted file as a disposable copy you can regenerate. If you find yourself converting the same image back and forth between formats, you are compounding damage with each round trip.
Frequently Asked Questions
Why Use OneConvert for Image Conversion?
Most online image converters upload your files to their servers, which raises privacy concerns and often requires an account or subscription. OneConvert is different — everything runs locally in your browser, meaning your images are never sent anywhere. Convert as many images as you need, for free, with no limitations.