What these image tools do
Images are usually the largest files on a page, in a document or in a message, so three jobs come up again and again. The image compressor reduces a photo's file size so it uploads and loads faster. The image resizer changes an image's dimensions, for example to fit a profile picture, a slide or a post. The format converter switches an image between JPG, PNG and WebP, because each format suits a different job: JPG for photographs, PNG when you need transparency or crisp graphics, and WebP when you want a smaller modern file.
These tools run in your browser, so you do not need to install an editor for a quick job, and you do not need an account to use them.
Choosing the right image tool
Start from the problem, not the tool. If the file is too big to send or too slow to load, compress it first and check the result at full size before you accept it — a thumbnail can hide quality loss that is obvious at full size. If the image is the wrong shape or size for its destination, resize it to the exact dimensions that destination asks for, rather than guessing. If a site or app rejects your file, convert its format, and keep the original as well, because converting back and forth between lossy formats loses quality each time.
One useful habit is to work on a copy, not your only original. Keep the original photo untouched, and compress, resize or convert a copy, so a mistake costs you a minute rather than a photograph.
Common mistakes to avoid
The most common image mistake is over-compressing: pushing quality down until text goes blurry or a sky turns blotchy, when a gentler setting would have been small enough. The second is resizing up: enlarging a small image does not add detail, it only makes the existing pixels bigger and softer. The third is converting a transparent PNG to JPG, which has no transparency — transparent areas become a solid colour, usually white or black. Check the result before you use it, especially after a format change.
Putting the tools together
A typical image job also passes through these tools in order. Start by resizing the image to the dimensions its destination actually needs, because compressing a huge image and then resizing it wastes effort, and resizing after compression can reintroduce artefacts. Next, convert the format if the destination requires it, keeping a copy of the original in case the conversion loses transparency or quality. Finally, compress the resized, correctly formatted copy, checking it at full size before you send or publish it. Following that order — resize, convert, compress — gives you the smallest file that still looks right, rather than a file that was compressed three times and looks worse each time.
Tools in this category
- Image Compressor — Reduce photo file size for faster uploads and loading.
- Image Resizer — Change an image's dimensions to fit its destination.
- JPG/PNG/WebP Converter — Convert images between JPG, PNG and WebP formats.
Frequently asked questions
Are these image tools free?
Yes. All three image tools are free and do not require an account.
Will compression reduce my image quality?
Compression can reduce quality if pushed too far. Check the result at full size and use the gentlest setting that gives you a small enough file.
Can I convert a transparent PNG to JPG?
You can, but JPG has no transparency, so transparent areas will become a solid colour. Keep a PNG copy if transparency matters.
Do I need to install anything?
No. These tools run in your browser with no download or installation.
Related guides
Read how to compress images without losing quality on the Daily Tools blog.