OCI Photo & Signature Specs 2026: Why Uploads Get Rejected

Almost every returned OCI application we see fails on the same two tiny files: the photograph and the signature. Not the eligibility, not the documents, not the fee — the small square image and the scribble next to it. A parent will spend an evening assembling birth certificates and passports, get all of it right, and then lose the evening because the portal decided the photo was the wrong shape, the wrong size, or the wrong ratio.

This page is the specification. It is the reference the rest of our upload guides point back to: exact dimensions, exact file-size bands, exact formats, the face-height rule the portal actually measures, and what the signature strip has to look like. If you are mid-application and staring at red error text, read the companion piece — every portal upload error, decoded — which takes each error string in turn. If you are doing a child's application, where the photo is genuinely the hardest single step, pair this with OCI for children in the UK 2026.

The specification, in one table#

Everything the OCI portal checks on the two image files, and what the Indian passport portal wants instead — because people routinely reuse one file for both and cannot understand why one accepts it and the other refuses.

The rest of this page explains each row, because two of them — the face-height rule and the five-attempt cap — are where almost all the damage happens.

The OCI photo#

Format, shape and pixels#

• Format: JPEG (.jpg). Not PNG, not HEIC — which is what most iPhones save by default — and not PDF.
• Shape: square, a 1:1 aspect ratio. You will see this quoted as 51 mm × 51 mm (2 in × 2 in), which is the printed equivalent; what the portal actually measures is pixels, so treat the millimetres as a description of the shape rather than a target.
• Dimensions: at least 200 × 200 px, at most 900 × 900 px. Anything smaller is refused as too small; anything larger is refused outright rather than resized for you.
• File size: between 10 KB and 200 KB. Both ends are enforced. A modern phone photo is several megabytes, so it has to come down — but not so far that it turns blocky, because a heavily compressed file draws the portal's "image quality is poor" warning and, later, a human reviewer's attention.

Crop to square. Never scale to square: squashing a rectangle into a 1:1 box stretches the face, and the portal has a geometry check that catches precisely that.

The face-height rule: 0.3 to 0.6#

This is the single most misunderstood number in the whole process, and it is the one the portal will quote back at you when it refuses the file.

The portal runs face detection, measures the height of the detected face, and divides it by the total height of the image. That fraction must land between 0.3 and 0.6. In plain terms: your head occupies between 30% and 60% of the picture's height. On an 800 px tall photo, the detected face must be between 240 px and 480 px tall.

Two clarifications, because this sends people to the wrong fix:

• It is height, not width. Adjusting how wide your face looks in the frame changes nothing. Only the vertical proportion is measured.
• Cropping too tight fails just as surely as standing too far away. A tight selfie that runs from eyebrows to chin is over 0.6. A full-length shot across a room is under 0.3. The error message does not tell you which way you have gone wrong, so check both.

The reliable method: start from an uncropped photo taken straight on from about a metre and a half away, then crop outwards from the head until the head height is a little under half the frame. If the original was already cropped tight to the face, you cannot fix it by editing — you need a new shot with room around the head.

Background, lighting and composition#

• Plain, even, light background — and not pure white. This is the opposite of the Indian passport rule and it catches out anyone who has just been to a high-street photo booth. Light grey or a pale cream wall is what the system is looking for. The automated check does not reliably catch a pure-white background; the human reviewer does, weeks later.
• No shadows on the face or on the wall behind your head. A shadow behind the head is a classic silent failure.
• Full face, front on, eyes open, neutral expression, mouth closed. No teeth.
• No glasses unless there is a medical reason, and no glare if you must wear them.
• No hands, arms or other people in the frame — the reason baby photos are so difficult.
• Head coverings worn for religious reasons are fine, provided the full face from chin to forehead is visible.
• Recent, and recognisably you today.

If what you are holding right now is a rectangular British passport photo, a HEIC file straight off your phone, a 4 MB image, or a studio shot against a white wall, it is non-compliant as it stands and the portal will refuse it. Fixing it is a crop, a conversion and a compression — you can do that yourself with any editor that shows you pixel dimensions and file size, or hand the raw files over and get a validated pair back.

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The OCI signature#

The signature is a separate file, and people trip on it because they treat it casually.

• Sign in dark ink — black or blue — on plain white paper. Pencil, a faint biro or a pale gel pen can read as blank once the file is compressed.
• Scan or photograph it straight on, evenly lit, with no shadow and no curl in the page.
• Crop tightly to the signature itself, leaving only a sliver of white around it, so the result is a wide, short strip — roughly three times as wide as it is tall. A signature floating in the middle of a full A4 scan is the classic failure.
• Format: JPEG.
• File size: the same 10 KB to 200 KB band as the photo.

If the field stays empty after what looked like a successful upload, the file failed validation silently — re-upload it on its own and confirm the thumbnail actually renders before you move on.

The hard limit that makes all of this worth reading#

The OCI portal states its own constraint plainly: "Document re-upload limit is 5 after which re-upload is not allowed. Document view limit is 5 after which view is not allowed."

The matching five-view limit catches people later: you can open each uploaded document only five times, so do not use the portal as the place to check what you submitted. Keep your own copy of every file you upload.

We have previously described a correction window of "around 21 days" for fixing a rejected image, after which the application is returned and the fee lost. We can no longer point to a published source for that number and are not going to repeat it as fact. The constraint the portal does state in its own words is the five-attempt cap, and that is the one to plan around. If you have received a rejection notice with a deadline on it, the deadline on your notice is the one that governs — act on it the same day.

Do filtered and AI-edited photos get flagged?#

We have said in the past that the portal, from 2026, actively detects beauty-filtered and AI-enhanced photographs. We cannot support that as a published rule. Neither the MHA nor the OCI services portal publishes an "AI detection" check, and the refusals the portal actually returns are about geometry, dimensions, file size, format and ICAO composition. So treat what follows as a practical warning rather than stated policy.

What is demonstrably true is that retouching makes the checks you can see more likely to fail. Skin-smoothing and portrait modes soften edges that face detection relies on. AI background replacement leaves halos around hair that read as an uneven background. Every extra save-and-recompress cycle through an online beautifier degrades the file and invites the "image quality is poor" flag. And a photo that no longer looks like you is a problem at human verification and again at the counter, where the point of the exercise is a face that matches a lifelong identity document.

Shooting a compliant photo at home#

You do not need a studio — a window, a plain wall and some discipline about four things.

Doing it yourself, honestly#

DIY is completely fine if you have an editor that shows you pixel dimensions and file size, a clean straight-on original, and the patience to check the head height against the frame before you upload. It is a fifteen-minute job and plenty of people never have a problem. We would rather say that than sell you something you do not need.

It stops being worth it when you have already spent two or three of your five attempts, when your phone insists on HEIC and you have no way to convert it, when a baby photo keeps failing on hands or shadows, or when the rejection message changes every time you try. At that point the remaining attempts are worth more than the fee. That is what the OCI photo and signature resizer is for: raw phone photo and signature in, a square JPEG inside the pixel and byte bands with the face height in range, and a 3:1 signature strip, back out.

For the whole application around these two files — the portal stage, biometrics, and the three-month passport-particulars rule — our fresh OCI application UK 2026 complete guide walks the process end to end.

Frequently asked questions#

What size and format does an OCI photo have to be?#

A square JPEG with a 1:1 aspect ratio, at least 200 × 200 px and at most 900 × 900 px, with a file size between 10 KB and 200 KB. The background must be plain, even and light — and specifically not pure white, which is the opposite of the Indian passport rule. You will also see the size quoted as 51 × 51 mm (2 × 2 inches); that is the printed equivalent of the same square shape, but the portal measures pixels.

What does the face ratio of 0.3 to 0.6 mean?#

The portal detects your face, measures its height, and divides that by the total height of the image. The result must fall between 0.3 and 0.6 — so your head occupies between 30% and 60% of the picture's height. On an 800 px tall photo, the face must be between 240 px and 480 px tall. Aim for about 0.45. The widely repeated advice to fill 70–80% of the frame is above the ceiling and will be rejected every time.

What are the OCI signature upload requirements?#

A separate JPEG file, between 10 KB and 200 KB, signed in dark ink on plain white paper and cropped tightly to a wide, short strip roughly three times as wide as it is tall. Scan or photograph it straight on with even lighting, then crop away the rest of the page. A signature sitting in the middle of a full A4 scan, or one so faint that compression erases it, is the usual cause of rejection.

How many times can I re-upload an OCI photo?#

Five. The portal states that the re-upload limit is five per document, after which no further replacement is allowed on that application, and there is no self-service reset. There is a matching limit of five views per uploaded document. This is why it is worth getting the file right before uploading rather than adjusting the crop and trying again — five attempts disappear in about ten minutes.

Can I use the same photo for my Indian passport and my OCI application?#

No. The Indian passport photo is a 630 × 810 px rectangle on a plain white background; the OCI photo is square, between 200 × 200 and 900 × 900 px, on a light background that must not be pure white, with a face height of 0.3 to 0.6 of the image height. A file prepared for one will be refused by the other, so prepare each application's image separately.

Will a beauty filter or an AI-edited background get my OCI photo rejected?#

There is no published "AI detection" check on the OCI portal, so we will not claim one exists. What is true is that retouching makes the checks that do exist more likely to fail: smoothing softens the edges face detection relies on, AI background replacement leaves halos that read as an uneven background, and repeated re-compression triggers the poor-quality flag. Cropping, converting and compressing are fine; retouching your face or fabricating a background is not.

Why does the OCI portal reject a white background?#

Because the OCI specification asks for a plain light background rather than a white one, and pure white is treated as out of spec — which is exactly what a high-street photo booth produces. Light grey or pale cream is the safe reading. This one often survives the automated check and is then picked up by a human reviewer weeks later, which is the worst possible time to discover it.

Does my photo have to be a specific number of millimetres?#

Not in any way the portal can measure. It reads pixels and bytes, so the practical spec is 1:1 shape, 200 × 200 to 900 × 900 px, and 10 KB to 200 KB. The 51 × 51 mm figure describes the same square shape at print size and is useful if you are asking a photo shop for the format, but hitting an exact millimetre measurement on a digital file achieves nothing on its own.

This guide sets out the OCI photo and signature specification for UK applicants as at August 2026 — the square JPEG at 200 × 200 to 900 × 900 px and 10–200 KB, the 0.3–0.6 face-height check, the roughly 3:1 signature strip, and the five-attempt re-upload limit the portal states in its own wording. Specifications and portal behaviour change without notice; confirm the current requirements on the official OCI services portal↗ before you upload. NriDirect is an independent agent and is not affiliated with VFS Global or the Indian High Commission.