When 100KB is a hard requirement
Upload an ID photo to a government portal, a headshot to a job site, or an image to an old CMS field and you’ll often hit the same wall: maximum 100KB. A photo straight from a phone camera is 3–8MB — dozens of times too big. People end up screenshotting, emailing themselves smaller copies, or pasting the file into sketchy “reduce to 100KB” sites that upload the image first.
Mynify does it the right way: it shrinks your image in the browser and never sends the file anywhere — which matters a lot when the image is your ID, passport photo, or signature.
How the 100KB target works
The Under 100KB preset (selected on this page) converts your image to WebP, a modern format that’s typically 25–35% smaller than JPEG at the same quality. Then it does something most tools don’t: it binary-searches the quality level. It encodes at a mid quality, checks whether the file is under 100KB, and narrows in — a handful of passes — until it finds the highest quality that still fits. So you get 98KB of good-looking image, not 40KB of mush.
All of this runs in a background worker, so the page never freezes, even on a large photo.
Getting a clean result
- Crop before compressing. Fewer pixels means the quality budget stretches further — crop to just the face or document.
- Start from the original. Compressing a screenshot of a photo loses quality twice; use the source image where you can.
- Check the format is accepted. Most modern forms take WebP, but a few older ones only allow JPG or PNG — check the field’s requirements first.
There’s no signup, no watermark, and no limit on how many images you process. Because it’s all local, even sensitive documents stay entirely on your device.