The Friendly Tier of Size Limits
100 KB is the limit you'll meet on classified-ad marketplaces, CMS uploaders, profile-photo forms and plenty of email systems — and it's a comfortable one. A well-encoded JPG at 700–800px wide fits under 100 KB looking genuinely sharp. The only problem is getting there from a 4 MB phone photo, and that's exactly what this tool automates.
How the Automatic Fitting Works
- Your image is converted to JPG if needed (transparency flattened to white).
- The engine binary-searches quality levels, checking the real encoded size each time.
- If even low quality can't fit — usually because dimensions are huge — the image is scaled down in steps and the search repeats.
- You get the largest, highest-quality file that still lands under 100 KB.
Great Use Cases at 100 KB
- Marketplace listings — product photos that load fast and pass upload validation.
- Website content — 100 KB is a sensible per-image budget for fast pages and good Core Web Vitals.
- Email attachments — send ten photos in the space one original would have taken.
- Profile pictures — most platforms display under 500px; 100 KB is more than enough.
Need a Different Number?
The target box accepts any value — or jump straight to our dedicated 50 KB and 20 KB tools for stricter forms. For full manual control over quality, use the JPG compressor with its live slider.