How to Reduce Image File Size Without Uploading It
Shrink photos and graphics privately by choosing the right dimensions, format, and quality in the right order.
If an image is too large to email or upload, start by making its pixel dimensions sensible. A 6,000-pixel photo does not need to stay 6,000 pixels wide when it will only appear as a 1,200-pixel image on a website.
After that, choose a smaller format such as JPG, WebP or AVIF and adjust the quality if you still need to. Doing it in that order normally looks much better than crushing the original with an extreme compression setting.
What actually makes an image file smaller
There are three useful controls: dimensions, format and quality. Dimensions are the width and height in pixels. Format is the file type, such as PNG or JPG. Quality controls how aggressively a format throws away detail to save space.
Do not work from your only copy. Keep the original image, then make a smaller copy for the website, form or email that needs it.
How to make the image smaller
Check the upload rules
Look for a maximum file size, maximum width or height, and the formats the site accepts. This tells you what the new file actually needs to be.
Drag the image into How to Convert
Choose JPG for an ordinary photo, or WebP/AVIF if the destination accepts it. Keep PNG for transparency or very sharp screen graphics.
Reduce the dimensions before lowering quality
If the destination only needs 1,600 pixels wide, resize the copy to around that width. Then use the quality control if the file is still over the limit.
Convert, save and inspect it
Open the new file at normal size. Check faces, text, smooth skies and hard edges. If those look good, you are done.
Common problems
The file is still too large
The image still has far more pixels than the destination needs.
Reduce the width and height before pushing the quality much lower.
Text looks fuzzy
The image was resized too far or saved as a low-quality JPG.
Use more pixels and try PNG or WebP for a screenshot or text-heavy graphic.
Smooth skies have visible bands
The quality is too low for a gentle colour change.
Raise the quality a little and compare again from the original.
Frequently asked questions
What is the fastest way to reduce image size?
For an oversized photo, reducing its pixel dimensions usually gives the biggest clean saving.
Will this reduce the original?
No, as long as you save the result as a new file. Keep the original untouched.
Is JPG or PNG smaller?
JPG is normally much smaller for photos. PNG is often better for screenshots, logos and transparency.
Does the desktop app upload the image?
No. The conversion happens locally on your computer.
Extra: Why repeated JPG saves make things worse
JPG, WebP and AVIF can discard a little information each time they are saved with lossy compression. Opening the small copy and shrinking it again can add more damage.
Keep the original and make every new size directly from it. That way a thumbnail, website image and email copy do not inherit damage from one another.
