How to Make an Image Under 100KB Without Ruining It
Need an image under 100KB for a form, a job portal or a website? You can usually get there in three moves: resize, choose the right format and lower the quality a little at a time.
Use our free Compress Image tool to do this in just a few clicks. It runs in your browser, so your files stay private.
Key takeaways
- Resizing the dimensions saves more than any other step.
- JPG and WebP shrink photos far better than PNG.
- Lower the quality in small steps and check the size shown.
- Keep the required dimensions if a form asks for them.
Why people need small images
Many upload forms, job portals and email systems set a maximum file size, and 100KB is a common limit. Small images also load faster on websites and use less mobile data. The goal is a file that is small enough but still clear.
The three things that change file size
| Lever | Effect | Notes |
|---|---|---|
| Dimensions | Largest effect | Fewer pixels mean far fewer bytes |
| Format | Large effect | JPG or WebP for photos, not PNG |
| Quality | Moderate effect | Lower in small steps |
Step by step
- Resize the image with Resize Image. Try 1200 pixels wide for a photo, or the size the form asks for.
- If it is a PNG photo, save it as JPG or WebP.
- Open Compress Image and set the quality to about 80%.
- Look at the size shown next to the result. If it is still above 100KB, lower the quality by 5 to 10 points and press Compress again.
- Check the image at full size and download it.
If it is still too big
| Try next | Action |
|---|---|
| 1 | Lower the quality to 70% |
| 2 | Resize to a smaller width, such as 1000 or 800 pixels |
| 3 | Crop away unneeded parts with Crop Image |
| 4 | Convert to WebP if the form accepts it |
By type of image
| Image | Format | Starting point |
|---|---|---|
| Photo | JPG or WebP | 1200 pixels wide, 75 to 80% quality |
| Passport or ID photo | JPG | Required dimensions, then lower the quality |
| Screenshot | JPG for photos in it, PNG for text | Crop first, then compress |
Passport and ID photos
Official forms often require exact dimensions and a maximum size. Crop to the required shape first, resize to the required dimensions, and only then lower the quality. Always follow the rules of the form, and keep the face clear and sharp.
Check the real size
Our tools show the size of each result in KB or MB. Remember that 1MB is about 1000KB, so 100KB is roughly one tenth of a megabyte. If a form still rejects the file, make it a little smaller than the limit to leave some room.
Mistakes to avoid
- Lowering the quality all the way in one step.
- Compressing the same file many times.
- Ignoring the dimensions that the form requires.
- Overwriting your original photo.
More help
For the full process, read how to reduce image file size and how to compress images without losing quality.
On a phone
The tools work in a mobile browser. Choose the photo from your gallery, resize it, compress it, and download the result. Photos taken on a modern phone are large, so resizing first makes the biggest difference.
Example workflow
A photo straight from a camera is often several megabytes. Resize it to about 1200 pixels wide, save it as JPG or WebP, and set the quality to about 80%. For many photos that is already close to 100KB or a little above it. If the result is still too big, lower the quality by 5 to 10 points, or reduce the width to 1000 or 800 pixels. Results vary with each image.
If the image is a PNG
PNG files keep every pixel, so a photographic PNG is very large. Converting it to JPG with WebP to JPG or the Convert Image tool, or to WebP, usually brings the biggest drop. Keep PNG only when you need transparency or exact pixels.
Keeping it sharp
- Crop away empty areas so the subject uses more of the frame.
- Do not go below about 60% quality for faces and text.
- Check the image at full size before you submit it.
Frequently Asked Questions
Can every image be made under 100KB?
Most can, if you resize enough. A very detailed image may need smaller dimensions to reach the limit.
Which format is best for a small file?
JPG or WebP for photos. PNG is usually larger.
Will the image look worse?
A little, but at moderate quality and sensible dimensions the change is small.
Is my image uploaded when I compress it?
No. The tools work in your browser.
Keep reading
Learn how to reduce image file size with five simple steps: resize, pick the right format, compress, convert to WebP and measure the result.
How to Resize an Image Without Losing QualityHow to resize an image without losing quality: scale down not up, keep the aspect ratio, use common sizes and compress afterwards.
How to Compress Images Without Losing QualityLearn how to compress images without losing quality: lossy vs lossless, quality settings, formats and a simple step-by-step workflow.