JPG and JPEG are the same thing
JPG and JPEG are two names for the same format; the three-letter version comes from old systems that limited file extensions. Whatever your file is called, this page handles it the same way. JPEG is the standard format for photos: phones, cameras and most websites use it, because it stores photographs efficiently by discarding detail the eye barely notices.
That also means JPEG has a dial you can turn. Lower the quality a little and the file gets much smaller, often with no visible difference. Lower it a lot and you start to see blocky areas and halos around edges. Compressing well is about finding the point just before that happens.
Quality levels or an exact size
There are two ways to work. Choose a level when you simply want lighter files: high keeps almost all the detail, medium is a good balance for sharing and websites, and low gives the smallest files when detail matters less. You'll see the size before, the size after and the percentage saved for each photo.
Type a size in KB when a form, a portal or an app sets a limit. ConvertirDocs then looks for the best quality that still fits. If that isn't enough, it reduces the dimensions step by step, and if the target still can't be met, it gives you the smallest version and says so.
Resizing is often the bigger win
A photo from a modern phone may be 4000 pixels wide or more, far more than any screen shows. Turning on the maximum side option, for example 1920 px, scales the photo down proportionally before compressing it. For photos destined for email, web pages or chat, this often saves more than lowering the quality, and the photo looks just as good on screen.
If you only need to change the dimensions, without touching quality, “Resize image” does exactly that.
Avoid compressing the same JPEG again and again
Every time a JPEG is compressed, a bit more detail is discarded. Compressing an already compressed copy several times adds up. Keep your original photos and always start from them when you need a new version, for example a 500 KB copy for your website and a 100 KB copy for a profile.
You can also keep the JPEG format or switch to WEBP, which is often lighter at the same quality and widely supported by browsers, though not by every form.
Private and free
Your photos are processed in your browser and are not uploaded or stored. EXIF data, including GPS location, is removed from the results, and the camera's orientation is respected. No account, no daily limit and no watermark.