Almost every online form has a file size limit — email attachments cap around 25MB, job portals and banking sites often want under 100KB. Shrinking an image to hit these limits without turning it into a pixelated mess is a skill worth having. The good news: a free browser-based image compressor handles it in seconds, with no upload and no privacy risk.
Why size matters
Big images are the #1 cause of slow websites. A page with a few uncompressed photos can weigh several megabytes, forcing users on mobile to wait and pay for data. Compressing images keeps pages fast, which is also a Google ranking factor.
The right settings for ~100KB
Start with the Image Compressor tool and use these settings as a starting point:
- Quality 60–75% for JPEG — barely visible difference, huge size savings.
- WebP output if the platform supports it — typically 25–35% smaller than JPEG at the same quality.
- Resize to the actual display size — a 4000px-wide photo displayed at 800px is wasting 80% of its bytes.
How to compress an image online
Drag and drop your image into the tool. Move the quality slider and watch the live preview update. The tool shows the original size, the compressed size, and the percentage saved, so you can dial it in until you hit your target.
Step by step
- Drag your image into the upload area.
- Set quality to around 70% and pick WebP or JPEG.
- Check the "saved" percentage in the preview.
- If it's still too big, lower the quality or choose a smaller output format.
- Click Download when the size looks right.
JPEG, PNG or WebP?
Use JPEG for photos and complex images. Use PNG when you need transparency or sharp text/edges. Use WebP when a modern format is acceptable — it's now supported in all major browsers and gives the best quality-to-size ratio.
Why browser-based compression is better
Your image never leaves your device. There's no waiting for an upload, no server that could keep a copy of your photo, and no watermark plastered across the result. Everything is processed locally, instantly and for free.
Wrap up
Hit the 100KB target in under a minute: drop the image, adjust quality, download. Faster forms, faster websites, and one less frustration in your day.