Image SEO for Small Sites: Alt Text, File Names, What to Skip

Image SEO is easy to oversell, so start with what it is worth. A clinic, a coaching centre or a travel desk is unlikely to get many enquiries from Google Images. That is a judgement, with no figure behind it: someone who needs a dentist or a visa appointment tends to type a few words and pick from the map and the results under it.

A few image jobs are still worth an afternoon. Alt text, the short written description attached to a picture, is what a screen reader reads aloud to a visitor who cannot see the photo. It is what a browser shows in the picture's place if the image fails to load. And Google's image SEO page says it uses alt text, along with its own image recognition and the content of the page, to work out what a picture is about.

What Google can and cannot read about a photo

The same page counts captions and image titles as part of the page content Google reads, and says the file name can give it "very light clues". It doesn't say how much image recognition makes out unaided, and a photo alone rarely shows whose reception it is or which city it's in. Those facts come from the words on and around the picture.

Alt text: say what the photo shows

Google's page says alt text should be useful and information-rich, with keywords used appropriately and in the context of the page. Filling it with keywords, the page warns, makes for a bad experience and may cause the site to be seen as spam. Our working rule: write the one short, true sentence you would say on the phone to someone asking what the picture shows. Four made-up examples:

• Clinic reception. Before: "reception". After: "Reception desk and waiting area on the ground floor, with a ramp at the entrance".
• Coaching classroom. Before: "IMG_4521". After: "Class 10 maths batch in the first-floor classroom, about twenty students facing the whiteboard".
• Tour photo. Before: "Kerala tour package cheap Kerala honeymoon best price". After: "Houseboat on the Alleppey backwaters at dusk, from our four-night Kerala itinerary".
• Team photo. Before: "our team". After: "Five of us at the front counter, the owner in the middle".

Decoration is the exception: a divider line, or a stock image that only breaks up the page. The W3C's accessibility tutorial on images says to give these an empty alt so that screen readers skip them. In plain words, leave that picture's alt text box blank instead of typing "line" or "image". Blank and missing are different, though: the tutorial adds that when the alt setting is absent from the page's code altogether, some screen readers announce the file name.

File names: fix the next upload, leave the old ones

Google does not oversell file names. Its page recommends names that are short but descriptive and sets a name describing a black kitten against IMG00023.JPG.

So build one habit. Before uploading, rename the file to a few plain words joined by hyphens, such as clinic-reception-ground-floor.jpg. Resize and compress it at the same sitting, for the reasons the site speed article covered earlier. The common web formats, JPEG and WebP among them, are on Google's list of supported image types.

Don't go back and rename photos already on your site. Google's image page is silent on renaming, so the reasoning is ours: the file name is part of the image's web address, and after a rename a page still pointing at the old address can show a broken picture. Google's guide to moving a site says image addresses have to be moved in the same way as all other content. That is real work for a clue Google itself calls very light.

Text trapped inside a picture

Look for a fee chart, a batch timetable, a doctor's OPD schedule or a festival offer uploaded as a single poster. On a phone it shrinks to the width of the screen, often with text too small to read without pinching and zooming. A phone number printed on the poster doesn't work as a tap-to-call link.

Google's image page says nothing direct about this. The W3C does: its tutorial on images of text calls it good practice to use real text in place of a picture of text, because real text can be resized without losing clarity. Can Google read a poster? Possibly. A Google documentation page on redacted information warns that character recognition may turn text in an image into searchable text. "May" is a thin thing to rest your fee page on.

Type the same information on the page as text and keep the poster beside it, with a short alt text that points to the typed version ("Fee chart for the 2026-27 batches, details below").

Put each photo beside the words it belongs to

Because Google reads the page content around an image, its page asks that images be placed near relevant text, on pages relevant to their subject. On a service site, the classroom photo goes beside the batch details and the doctor's photo beside her name and timings. A caption helps when it adds a fact the reader wants ("Saturday doubt-clearing session, Class 12 physics"). A gallery page of sixty unlabelled photos gives the visitor, and Google, little to go on.

Use your own photos where you can

Stock photos aren't mentioned on Google's image page, so this is our advice. A real photo of your premises or your team answers questions a stock photo cannot. Is the classroom a hall of a hundred or a room of twenty? A smiling model in a headset tells the visitor none of that. A phone photo taken in daylight is enough. Ask the people in the picture before you publish their faces.

Doing this without a developer

Alt text is usually a box labelled "alt text" or "alternative text" in the image's settings. In WordPress, clicking an image in the media library opens its details, and Alt Text is one of the fields. Builders differ, so if you can't find the box, search your builder's help pages for "alt text". An edit made in the library may not reach a copy of the image already placed on a page, so check the page itself afterwards.

To check a page, paste its address into WAVE, the accessibility checker at wave.webaim.org. It flags images whose alt text is missing as errors and marks the ones left empty, so you can see what a blank box produces on your site. For the rest it reveals the wording, and whether that fits the photo is yours to judge. Or ask whoever built the site for a list of images with no alt text.

The order to do it in, and what to skip

1. List the handful of pages an enquiry is most likely to pass through: the home page, your main service pages and the contact page.
2. On those pages, find every picture that carries text (a fee chart, a timetable) and type the same information as text beside it.
3. Write alt text for the real photos on those pages, and leave decoration blank.
4. From today, give every new upload a descriptive file name and alt text.

Stop there. Don't rename old files. Skip the image sitemap Google's page offers for images it might not otherwise discover; in our view a small site doesn't need one. And if the titles on those pages still read like filing labels, the earlier article on title tags is a better use of the hour.

FAQ

Will adding alt text improve my rankings?

Nobody can promise that, and Google's page doesn't. It says alt text helps Google understand what an image is about. Treat the work as making the page clearer to Google and usable for a visitor who can't see the photo.

Should alt text include my city and service keywords?

Only where the photo shows them. "Front entrance of our Indiranagar clinic" is a fair description of that one photo. The same city and service pasted into every image's alt text is the kind of keyword stuffing Google's page warns about.

My gallery has two hundred photos. Do they all need alt text?

Not this week. Once the enquiry pages are done, add a short, true description to gallery photos a few at a time. Don't paste one sentence across all two hundred.