What size is a Ireland passport photo?

35 × 45 mm (1.38 × 1.77 in). A digital file is 715 × 951 px.

Can I take a Ireland passport photo with my phone?

Yes. PhotoSpec crops to 35 × 45 mm and checks the framing before you save. Photos are processed on the phone and are not uploaded.

Ireland

35 × 45 mm · Light grey, off-white or plain white · 715 × 951 px · Up to 9 MB · Taken within the last 6 months

Photo size	35 × 45 mm (1.38 × 1.77 in)
Head height	70–80% of the photo height
Background	Light grey, off-white or plain white
Digital size	715 × 951 px, up to 9 MB
File format	jpeg
How recent	Taken within the last 6 months
Retouching	Not allowed. The photo must not be digitally altered beyond cropping.
Background replacement	Not allowed. Shoot against a wall of the required colour.
Where to take it	You can take this photo yourself.

Source: dfa.ie passport photo-guidelines. Rules change — check the issuing authority before you submit.

You submit a code or number issued by the photo studio.
get a code to add the photo to your application ireland.ie

The authority allows a photo taken without a studio — its own wording is below.
for online applications you can have your photo taken at home ireland.ie

Colour photo.
Be in colour ireland.ie
No filters, retouching or digital changes.
Not be digitally enhanced or changed ireland.ie
Selfies are not accepted.
You cannot take a selfie ireland.ie
Paper passport application: the witness must write the form number on, sign and stamp the back of two of the four photos.
Sign and stamp the back of those two photos ireland.ie

A photo you already have for another Ireland document may not work here. This one takes light grey or off-white or plain white, while the visa photo takes plain white or light grey. The background has to be right in the shot — it cannot be swapped afterwards.
The authority sets a maximum file size but does not publish a pixel size, so the dimensions are your decision. Compress from a full-resolution photo rather than shrinking the picture until it fits.

Checked against the issuing authority’s own published material. Requirements change without notice — confirm before you submit.

What size is a Ireland passport photo?: 35 × 45 mm (1.38 × 1.77 in). A digital file is 715 × 951 px.
Can I take a Ireland passport photo with my phone?: Yes. PhotoSpec crops to 35 × 45 mm and checks the framing before you save. Photos are processed on the phone and are not uploaded.

Visa — background light grey, off-white or plain white here, plain white or light grey there

Processed on your phone. Photos are not uploaded.