QRix
Hit exactly 300×300 — a compact square for avatars, badges and directory listings.
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300×300 sits in the useful gap between a thumbnail and a full avatar: big enough that a face or a logo still reads clearly, small enough that the file stays trivially light and slips under most upload limits. Directory listings, forum profiles, badge images and internal tools frequently settle on roughly this size. Because the square is modest, tight cropping matters — a wide photo reduced to 300 pixels leaves very little room for a subject that was small in the frame to begin with. Fill crops to a centred square, fit preserves the whole image against a background colour, and lowering the quality slider will squeeze the file further if a strict limit is the actual obstacle.
For most forums and directories, yes. Platforms that render avatars on high-DPI screens may prefer 400×400 or larger, so check any stated minimum.
Crop in on the subject before resizing. At this size there are not enough pixels for anything small in the original frame to stay legible.
Use the quality slider. It reduces file size while the image stays exactly 300×300.
No — these are pixel dimensions, not resolution. DPI only matters when printing, and a 300×300 file prints at just one inch square at 300 DPI.
No. Resizing runs entirely in your browser with the Canvas API, so the file never leaves your device and nothing is stored or transmitted.
It's free, private and works right in your browser — no signup, no watermark.