How to use the Image Converter
Choose the output format
PNG for transparency and exact pixels, JPEG for photographs, WebP when the file is going on a website.
Add your images
Drop in one file or a batch. They are read directly by your browser and never uploaded.
Download the result
Each converted file gets its own download button, with the before and after size shown so you can see what the change cost.
Which format should you convert to?
PNG is lossless and supports transparency. It is the right answer for logos, screenshots, diagrams and anything with sharp edges or flat colour. It is the wrong answer for photographs, where it commonly produces a file several times larger than a JPEG that nobody could tell apart from it.
JPEG is for photographs. It has no transparency at all, so anything transparent has to be flattened onto a background colour before it can be encoded. It is universally supported, which is why it remains the safe choice for a file going to an unknown recipient.
WebP is the modern web format and is supported by every current browser. It is typically 25 to 35% smaller than an equivalent JPEG and, unlike JPEG, it supports transparency. Its weakness is outside the browser: plenty of desktop software, older phones and printing workflows still will not open it.
Converting does not recover quality
Every lossy format discards detail permanently when it encodes. Converting a JPEG to PNG makes a lossless copy of an image that has already lost data - the artefacts are now preserved perfectly, at a larger file size. Nothing is recovered.
This is worth knowing because it is the single most common misunderstanding about format conversion. Convert to PNG because you need transparency or a format a tool demands, not because you want the image to look better than the file you started with.
Why this one does not upload your files
Most online converters take the upload first and process it on a server. Whatever the policy says, your image sat on infrastructure belonging to someone else - which is a poor arrangement for a passport scan, a medical document, an unreleased product shot or a screenshot with customer data in it.
This runs on the canvas and image codecs already built into your browser. The file is read locally, converted locally and saved locally. There is no upload wait, and no file size cap other than what your own machine can hold in memory.
Frequently asked questions
- Are my images uploaded anywhere?
- No. Conversion uses the image codecs already built into your browser, so files never leave your device. That makes this usable for confidential documents and unreleased material.
- Can I convert several images at once?
- Yes. Drop in a batch and every file is converted with the same settings, each with its own download button.
- Why is my converted file larger than the original?
- You have probably converted a lossy format to a lossless one, most often JPG to PNG. PNG stores every pixel exactly, including the compression artefacts already baked into the JPEG, so the file grows.
- Which formats are supported?
- JPG, PNG and WebP as output. Input is anything your browser can decode, which also covers AVIF, GIF, BMP and SVG.