How to convert an image
- Add your image. Drag and drop a JPEG, PNG, WebP, AVIF or GIF onto the dropzone, click to browse, or paste from your clipboard. You can queue up several at once.
- Choose the output format. Pick JPEG, PNG, WebP or AVIF. Use WebP or AVIF for the smallest web-ready files, PNG when you need lossless transparency, or JPEG for maximum compatibility.
- Set the quality. For JPEG, WebP and AVIF, adjust the quality slider — around 80 is a great balance. PNG output is always lossless, so there is no quality to set.
- Download your converted files. Save each converted image individually, or grab them all at once as a ZIP. Change the format or quality and re-convert anytime.
Why convert between image formats?
Not every image format is right for every job. A logo saved as a JPEG looks fuzzy around its edges; a photograph saved as a PNG can be several times larger than it needs to be; and a decade-old GIF takes up far more space than a modern equivalent. Converting an image to a more suitable format can make it dramatically smaller, sharper, or more compatible with whatever you are publishing to — without re-shooting or re-designing anything.
The most common reason people convert is to shrink images for the web. Moving a photo from JPEG to WebP or AVIF can cut its size by a quarter to a half at the same visual quality, which means faster pages and lower bandwidth bills. Others convert the other direction — turning a WebP or AVIF back into a universally supported JPEG or PNG so it opens in older software or can be attached to an email. Because this converter runs entirely on your device, you can do all of that without handing your images to a remote server.
Lossless and lossy conversion: what changes
Converting an image always means decoding it and re-encoding it in a new format, and the format you choose decides whether that step is lossless or lossy. PNG is lossless: every pixel is preserved exactly, which is why it is ideal for graphics and screenshots but produces large files for photos. JPEG, WebP and AVIF are lossy by default — they throw away detail your eye is least likely to miss in order to make the file far smaller, and a quality slider controls how aggressive that trade-off is.
A key thing to understand is that lossy conversion compounds. Each time you re-encode an already-lossy image, a little more detail is discarded, so you should always convert from the highest-quality source you have rather than from a copy that has already been squeezed. Converting a lossy JPEG to PNG will not magically restore lost detail either — it simply stores the already-degraded pixels losslessly, usually in a bigger file. For photos, a quality of 75–85 in JPEG, WebP or AVIF is the sweet spot where the result is essentially indistinguishable from the original at normal viewing sizes.
A quick guide to the four formats
Each format has a job it does best. JPEG is the universal photo format — supported everywhere, great for continuous-tone images, but with no transparency. PNG is lossless and supports an alpha channel, which makes it the right pick for logos, icons, screenshots and any graphic that needs crisp edges or a transparent background. WebP is the modern all-rounder: it handles both lossy photos and lossless transparency and is typically 25–35% smaller than JPEG. AVIF usually produces the smallest files of all and supports transparency too, at the cost of slower encoding and slightly narrower software support. You can read an authoritative breakdown of each on MDN’s guide to image file types.
In practice: choose JPEG or WebP for photographs, PNG or WebP for graphics and anything with transparency, and AVIF when the absolute smallest file matters and your audience uses current browsers. Remember that JPEG has no transparency, so converting a transparent PNG or WebP to JPEG will flatten it onto a solid background. If you only want to make a file smaller without changing its format, the dedicated JPEG, PNG, WebP and AVIF compressors are a better fit.
Tips for clean conversions
- Convert from the original. Start from the highest-quality source you have so you are not re-compressing detail that was already lost.
- Mind transparency before choosing JPEG. If your image has transparent areas you want to keep, pick PNG or WebP — JPEG cannot store an alpha channel.
- Try WebP first for the web. It is the best balance of small size, transparency support and broad browser compatibility, making it a safe default for most websites.
- Resize while you convert. If the image will be displayed small, reducing its dimensions saves far more than format choice alone — use the built-in resize option or the dedicated image resizer.
- Compare before committing. Convert the same source to WebP and AVIF and check the file sizes and how they look at your display size; the winner varies from image to image.