Compress an image for the place you need to upload it
An image that looks right can still be too large for an attachment, form or website. Use image compression to make a smaller delivery copy while keeping your original available.
Start with the destination's actual requirement. A limit of 500 KB is a file-size requirement. A maximum width of 1200 pixels is a dimension requirement. These are related, but changing one does not guarantee the other. Knowing which limit you need to meet helps you avoid unnecessary quality loss.
The image compression controls let you adjust output quality and enter a target file size. The target guides compression; it is not a guarantee that every picture can reach that number with acceptable detail.
How to compress an image online
- Add your images and choose an output format.
- Adjust quality or enter the file-size target you want to try.
- Process the files, inspect their appearance and check the resulting size before downloading.
Image compression runs in your browser without an account. You can process up to 30 files and 160 MB of combined input at a time. Each image is limited to 40 MB and 24 megapixels.
A mixed collection deserves a mixed review. A setting that looks fine on a photograph may damage small writing in a screenshot. Try a few representative pictures before applying one choice to an entire batch.
Give image compression a realistic size target
A target size helps when a form tells you exactly how many kilobytes it accepts. Enter that target, run compression and compare the actual result with the upload requirement.
Some images will remain above the requested size. Detailed textures, large dimensions and the selected format can limit what compression achieves. Do not assume that a target entered into the tool has already been met.
If the image is still too large, reduce its dimensions where the destination allows that. A smaller picture contains fewer pixels to encode. Keep enough resolution for its purpose, especially when the recipient must read text or inspect fine detail.
Choose image compression for your format
JPG compression is often useful for photographs that do not need transparency. Lower quality settings can reduce size but may introduce visible blocks, halos or smudged texture.
WebP compression is another option for destinations that support it. It can retain transparency, although output size still depends on the picture and settings. Test that the receiving website or application accepts WebP before relying on it.
PNG is useful for transparent graphics and sharp-edged artwork. PNG compression in this tool can reduce the color palette, which may change colors and gradients. Treat that as a potentially lossy choice rather than assuming every smaller PNG is visually identical to its source.
Check image compression where detail matters
For a product photo, check labels, texture and boundaries. For a screenshot, read the smallest text that the recipient must understand. For a chart, inspect thin lines and differences between nearby colors.
Also view the compressed image at its intended display size. A small social preview has different needs from a picture that users will zoom into. There is no single quality setting that is right for every destination.
If transparency matters, check the edges against a suitable background. If JPG is the output, transparent areas must become a solid color. A smaller file that loses an essential transparent edge may not be a useful result.
Start each image compression task from the original
Return to the original each time you need a new export. Repeatedly opening and saving lossy images can add visible changes without producing a proportionate reduction in size.
Keep a clear distinction between your source and the copy prepared for upload. If the first result is too soft, you can choose a higher quality setting from the original. If you only keep the compressed copy, you cannot reverse the discarded detail.
For a large photograph used in a small space, resizing once and then compressing may be more effective than repeatedly lowering quality at full dimensions.
Image compression questions
Can I compress an image online to an exact size?
You can request a target, but the tool does not promise an exact result. Check the final size. You may need to change format, reduce dimensions or accept more visible compression.
Can I compress an image without losing any quality?
That depends on the source and output. JPG and quality-based WebP export can discard detail, and PNG palette reduction can change colors. Compare the result instead of assuming it is lossless.
Why did the file become larger?
The selected output format or quality can be less compact for that source. Try a different setting or retain the original when it already meets your needs.
Will compression change the width and height?
File-size compression and resizing are separate tasks. Use the resize tool when you need particular pixel dimensions.
Is a blurry result recoverable?
Keep the original and export it again with a less aggressive setting. Increasing quality on the already compressed copy will not restore information that has been discarded.