How to write alt text for library photos

Good alt text does more than label an image. It gives people who cannot see a photograph a meaningful understanding of what it communicates, while helping search engines interpret the page that contains it. For library websites, where images document programs, spaces, collections and local communities, that balance matters for accessibility and image SEO.

Many library photos begin as DSC_4821.jpg or arrive with a generic caption such as “library event”. Alt text should go beyond that vague label with the information a reader needs. It should explain the subject, setting and purpose of the photograph, not simply repeat the page heading or fill the field with search terms.

Writing useful alternatives is a small editorial skill with a broad audience. It supports screen-reader users, people who face visual or cognitive barriers, and visitors browsing on mobile connections. It also gives image-search engines stronger context. The aim is accurate, useful language that works in the place where the image appears.

Why library alt text matters

An alt attribute provides a text alternative when an image conveys information. A screen reader can announce it alongside the surrounding content, allowing a visitor to understand a librarian demonstration, a workshop layout or a special collection without seeing the photograph. If an image is purely decorative, a properly implemented empty alternative prevents unnecessary interruption.

Accessibility is the first priority. Australian Government services follow the Digital Service Standard and WCAG guidance, and many council and state library sites aim for the same WCAG 2.1 or 2.2 AA benchmark. WCAG success criterion 1.1.1 asks non-text content to have an equivalent text alternative. Good alt text therefore removes a common barrier rather than treating accessibility as an optional image caption.

There is also a search benefit, although it should not be overstated. Search engines use alt text, page copy and image metadata to understand what a page and its pictures are about, which can support image indexing and relevance. Strong alternatives can help a photograph of a Brisbane City Library workshop appear in results for the right topic. Alt text alone is not a ranking shortcut, and accurate descriptions are more valuable than repeated keywords.

Start with the image’s purpose

Begin by deciding what information the image contributes. An informative photograph needs a description of its relevant content; a decorative image does not. If the image links to a booking page, its alternative should describe the destination, such as “Book a place at the Melbourne storytelling session”. If the surrounding paragraph already identifies the speaker and date, the alt text should add the visible action rather than repeat every nearby detail.

Describe what is useful to understand, not every pixel. For a workshop photograph, that may be the facilitator pointing to a large screen while participants follow along. For an interior, it may be the arrangement of wide desks beside a quiet study zone. Use precise, plain language and include visible wording when it carries meaning. “A librarian demonstrates the catalogue at the National Library of Australia in Canberra” is more useful than “a man points at a computer”.

Avoid formulaic openings such as “image of” or “photograph showing”. A screen reader already announces that an image is present, so those words consume time without adding meaning. There is no universal character limit, but one or two short sentences are usually enough to preserve the photograph’s purpose. Put the essential subject first and add context only when it changes the meaning.

For a complex map, timetable or infographic, short alt text can point to a longer description placed immediately before or after the image. For text embedded in a poster, transcribe the important wording in nearby copy if it is too long for the alt attribute. This approach keeps the interface usable without forcing a lengthy alternative into a field designed for a brief summary.

Describe common library photos

Exterior images should establish a recognisable place when location matters. For an actual photograph of its entrance, “The sandstone entrance of State Library Victoria on Swanston Street” gives a visitor more context than “library building”. The same principle applies to branches: identify the City of Melbourne or City of Brisbane location only when it is accurate and relevant. Misleading location text may improve a keyword list at the expense of trust.

Photos of staff and participants need a careful balance of context and privacy. An event image might be described as “A librarian leads a bilingual family literacy session at a local council library”. Avoid identifying a person, inferring a disability, ethnicity or relationship, or naming a child. The description should communicate what the activity demonstrates without turning the alt text into a biographical record.

Collection photographs can attract search interest, but should specify the subject rather than rely on institutional prestige. When those details are verified, “A visitor browses books about Australian cinema in the State Library of NSW” works well. For postal services offered by some Australian libraries, “A visitor receives a parcel at an Australia Post counter inside a participating library” is clear and geographically relevant. A vague label such as “Australia Post” would miss the service being illustrated.

Captions and alt text can work together without becoming identical. A visible caption might identify the event and date, while the image alternative explains the activity: “A librarian reads a picture book to children seated on a floor mat”. The alternative remains understandable when the image is encountered through search, social media or another page that does not include the original caption.

Handle privacy, permissions and cultural context

A photograph taken in a public library is still a photograph of people. Alt text can amplify details visible in the image, including names on badges, text on screens, library-card numbers or a person’s routine. Check every image for personal information, and do not reproduce it in the alternative text. Permission to publish a photograph also does not automatically mean its alt text should expose more than the photograph itself.

Cultural description requires particular care, especially for Aboriginal and Torres Strait Islander art, language and community events. Do not identify a Nation, artist or story from visual appearance alone; use verified catalogue information and the language approved by the relevant community or institution. For a NAIDOC Week program, the alt text can name the event and activity while the page provides fuller context. Where a design is restricted or sensitive, follow the library’s cultural protocols and decide whether the image should be included at all.

The alt text should not contradict the caption, metadata or rights information. If a photo has been licensed for a specific campaign, use wording that reflects that campaign rather than describing an older or unrelated version of the event. Keep a record of the approved description in the digital asset management system so that staff updating the page do not recreate the image from memory.

Publish accessible images and build visibility

Search visibility comes from several connected signals. Alt text is one of them, alongside a descriptive filename, visible caption, relevant page copy, headings and structured data where appropriate. A filename such as brisbane-family-literacy-2025.jpg is more intelligible than IMG_2048.jpg, but it still needs a natural sentence in the alt field. This combination makes the asset easier to find, maintain and reuse.

Images shared through social channels need the same editorial care. Instagram can generate a basic description, but staff should add or edit alt text so it reflects the actual post rather than relying on automatic recognition. Teams adapting campaign artwork for Stories can use reusable Instagram templates to speed up production, while each finished post still needs its own accurate alternative. Consistent design does not mean identical descriptions.

Build the task into the publishing workflow. Give photographers and marketers a brief asking what the image shows, what it helps the reader understand, and whether it is decorative. Have the person who wrote the surrounding copy check the alt text for accuracy, then include accessibility checks in the website release process. This is especially important for busy council libraries, where a single event page may be adapted by several staff members and several platforms.

Choose one branch’s five most important images today, write precise alternatives for them, add those descriptions to the content management system and publish the updates. Then use that batch to establish a repeatable standard for every library photograph released from that branch.