300×300 px Photo

The 300×300 photo is defined by pixels rather than by a paper size. The requirement is a square image that is exactly 300 by 300 pixels. At a standard print resolution of 300 dpi, those pixels correspond to a physical square of 25.4×25.4 mm, which is exactly 1×1 inch. In other words, this is a digital-first square portrait: what the system checks is the pixel count, so the headline number to hit is 300×300 px.

Our service produces this format to the exact pixel dimensions so that online forms and upload portals accept it without resizing.

Where this size is used

A 300×300 pixel image is typically requested by online application systems, account portals, digital identity profiles and web forms that store a small square avatar or document photo. Because the requirement is stated in pixels, it almost always means a digital upload rather than a physical print. If a portal asks for a 300×300 image, supplying anything larger or non-square may be rejected or cropped awkwardly, so matching the exact pixel size is what matters here.

Exact specification

The output is exactly 300×300 pixels, a perfect square. At 300 dpi this equals 25.4×25.4 mm, or 1×1 inch, though the pixel dimensions are the binding requirement. The head height works out to approximately 19 mm at this scale, keeping the face within a band of about 55 to 75 percent of the frame. Importantly, the rules for this format differ from the millimetre-based sizes: glasses are allowed here provided the eyes are clearly visible without glare, while headwear is forbidden entirely. The background must be plain white (#FFFFFF), with a neutral expression and no smile.

• Output: exactly 300×300 px (square), 300 dpi, equal to 25.4×25.4 mm / 1×1 in
• Head height: approximately 19 mm (about 55–75% of frame height)
• Background: plain white, uniform and shadow-free
• Expression: neutral, mouth closed, no smile
• Glasses: allowed, provided the eyes are clearly visible with no reflection
• Headwear: forbidden
• File: JPG, up to 2 MB

Common rejection reasons

The most common failure for a 300×300 photo is the wrong pixel dimensions: an image that is larger, smaller or not perfectly square will be refused by systems that check the exact size. Unlike the millimetre formats, glasses are accepted here, but glare or reflection hiding the eyes will still cause a rejection, so clear eyes matter. Headwear is not allowed at all for this format, so any hat or cap leads to refusal. Other issues include a non-white background, shadows, a smile, and a head that is too large or too small within the small square.

How we prepare your photo

Upload a normal photo on any background. Our service isolates you, places you on a uniform white field, and frames the portrait in a perfect square. The image is then exported at exactly 300×300 pixels so it matches the pixel requirement precisely. We position the head to the approximately 19 mm equivalent within the frame, balance the lighting, and confirm a neutral expression. Since glasses are permitted for this format, we keep them only when the eyes stay clearly visible without glare, and we ensure no headwear is present. The final JPG stays within the 2 MB limit.

Print vs digital

Because it is defined in pixels, the 300×300 format is essentially a digital deliverable. The 300×300 px JPG uploads directly to portals and forms that specify this size and stays under the 2 MB cap. If you ever need a physical version, the same file prints at 1×1 inch at 300 dpi, since the pixel and inch dimensions line up, but the primary use is online. We deliver the exact-pixel file so your upload is accepted on the first attempt.

Working with a pixel-defined size

A pixel-defined requirement like 300×300 behaves differently from a millimetre format, and understanding that helps you avoid trouble. The number that the upload system reads is the pixel count, so the file must be exactly 300 pixels wide and 300 pixels tall, no more and no less. Scaling a much larger photo down to fit can soften fine detail, while stretching a smaller one up introduces blur, so it is best to start from a clear original and let us produce the final 300×300 px export from it. We also keep the square truly equal on both axes, because a portrait that is even slightly rectangular will fail a strict size check. With glasses permitted here and headwear not, we confirm those two rules specifically before delivering the file.

Preparing the 300×300 pixel photo once, with its allowed glasses, forbidden headwear and precise square pixel size, gives you a reliable image for any online system that requests this format.