How to compress an image to 100KB
- Choose your image. Tap the upload box or drag photos onto it. JPG, PNG, WebP and iPhone HEIC files all work, and you can add several at once.
- Check the target. It's already set to 100KB. If your form lists exact pixel dimensions, enter the width in “Max width.”
- Compress. The tool automatically tests quality levels and keeps the sharpest version that fits under 100KB. It only shrinks the dimensions if quality alone isn't enough.
- Download. Each result shows the new file size, dimensions, and quality. Click Download to save it.
When you need a 100KB image
- Job portals and online applications. Many job sites and admission forms cap image uploads at 100KB.
- Website and blog images. 100KB is a common target for fast-loading in-article images.
- Email and messaging. Smaller images send faster and don't clog inboxes.
Requirements vary between websites and change over time, so always check the official instructions for the exact file size, dimensions, and format.
Best dimensions for a 100KB image
| Image type | Typical dimensions | Expected quality at 100KB |
|---|---|---|
| Profile or ID photo | 600×800 to 1000×1300 px | Excellent |
| Blog / in-article image | 1000×667 to 1200×800 px | Sharp |
| Product photo | 800×800 to 1000×1000 px | Very good |
File size depends on both pixel dimensions and detail. A simple photo with a plain background compresses much further than a busy scene with lots of texture.
Tips for the best quality at 100KB
- For websites, 100KB at around 1200px wide is a sweet spot for page speed and quality.
- If you run a website, consider WebP — it's usually smaller than JPEG at similar quality. Try our WebP converter.
- Remove unnecessary background by cropping before you compress.
- Keep the original file — compression is one-way, and you may need a different size later.
Why the result is slightly under 100KB
Websites count a kilobyte as either 1,000 or 1,024 bytes. This tool keeps every file under 100,000 bytes, so it passes a 100KB limit either way.
Frequently asked questions
Is 100KB a good size for website images?
For most in-article images, yes. Around 100KB at 1000–1200 pixels wide balances quality with fast loading, which helps Core Web Vitals.
Why is my 100KB image smaller than 100KB?
The tool finds the best quality that fits under your target. If the image already looks great at a smaller size, you get a smaller file — which is a bonus for speed.
Are my images uploaded to a server?
No. Compression happens entirely in your web browser using your device. Your images never leave your computer or phone.
Does it work on my phone?
Yes. It works in modern mobile browsers on iPhone and Android. Tap the upload box, pick a photo from your gallery, and download the result.
What format is the compressed image?
The result is a JPG (JPEG) file, the format almost every form and website accepts. Transparent areas become white.
How do I compress an image to 100KB on my phone?
Open this page in your phone's browser, tap the upload box, choose a photo from your gallery, and tap “Compress to 100KB.” Then tap Download to save the smaller file.