Alt Text Writer for Manual Image Descriptions

Start with the image job and the words you already know

The Alt Text Writer is a manual description workspace, not an image recognition service. You look at the visual, decide what matters, and write the words. Begin with one item and give it a label that another person can match to a file, such as “Lunchbox, closed front view.” Choose the intended platform and a purpose that reflects the image’s job: a photo, an image with text, a chart or diagram, part of a sequence, or an image with a functional role. These choices organize the review. They do not connect an account, discover a native field, or decide automatically that an image is decorative.

For a worked example, imagine three images introducing a reusable lunchbox with a removable divider. The first shows the closed box, the second shows the open compartments, and the third is a printed instruction card. The accompanying caption explains that customers can compare the parts before choosing the product. Enter that context rather than copying a sales slogan into every description. Someone reading only the first image’s description should understand its visible arrangement, while someone reaching the instruction card should receive its actual wording. Shared campaign context helps you decide what to include without making the three descriptions interchangeable.

Separate observations from claims while you prepare the set. A lid can look fitted without proving that it is leakproof. A metal body does not establish its exact alloy. Describe a pale green lid and a raised corner tab when those details are visible, but leave unverified material or performance claims out. Put unresolved questions in publication notes so the product owner can answer them before handoff. The tool does not research the product, rewrite doubtful statements, or check whether a photograph supports your wording. Useful preparation begins with a narrow, observable account of what this particular image contributes to this particular explanation.

Attach optional previews without confusing them with saved media

You can work from an image open elsewhere, or attach a local JPEG, PNG, or WebP for a preview beside the text. The tool accepts source files up to 15 MiB, with neither dimension above 12,000 pixels and no more than 40 megapixels. It prepares a smaller preview locally, bounded by 1,600 pixels and two megapixels. That preview is reencoded rather than retaining the original file’s metadata. These limits concern this workspace, not a social platform’s upload requirements. Inspect the original separately whenever small lettering, a fine texture, or a crop needs more detail than the prepared preview provides.

Create the other two records and label them “Lunchbox, open compartments” and “Divider instruction card.” A project holds one to twelve descriptions. Each item has a stable identifier as well as its place in the current order, so moving the card does not turn it into a different record. Use descriptive labels to make the inventory readable and filenames to connect it with production files. The filename is a reference, not evidence that the correct photograph is present. A duplicate carries the text and filename reference. When the source item has an attached prepared preview, the duplicate shares it through a new local URL of its own. Manual review is cleared.

Attached images stay in this open tab’s session; there is no project autosave or account storage. Downloaded JSON contains the text, settings, and image filename references only. It does not contain image data, thumbnails, or a recoverable copy of the originals. After opening a saved project, reattach the corresponding files and compare them again with the descriptions. Keep the production images separately in a location your team controls. The writer has no URL fetch, private upload service, or image library that can retrieve missing files for you. Saving the words is essential, but it is a different action from preserving the media those words describe.

Build the first description from three kinds of notes

Select the closed lunchbox and enter “A rectangular lunchbox with a pale green lid” as the subject. In details, write “A raised tab sits at the front right corner.” Leave visible text empty because this photograph contains no readable lettering. These fields are a way to organize your observations before drafting; they are not prompts sent to an AI model. You can also type a finished description directly without filling every note field. Context explains why the image matters, while subject and details describe what you have actually observed. Keep publication instructions, such as which approved photograph to use, out of the public description.

Choose Compose from notes to join the supplied wording. For these inputs, the result is “A rectangular lunchbox with a pale green lid. A raised tab sits at the front right corner.” The composer adds sentence separation where needed; it does not inspect pixels, infer what the tab does, or improve the writing. If a description already exists, confirm whether to replace it. The joined result appears in the description field after you accept; review it there, especially when your notes contain fragments or repeated words. Composition applies to the selected item, does not change the image, and does not update the descriptions belonging to other records.

Now make an editorial decision yourself. Perhaps the image is closely cropped and “rectangular” adds little, while the location of the opening tab helps customers recognize the next view. You might manually revise the description to “Closed lunchbox with a pale green lid and a raised tab at the front right corner.” Check that wording against the actual view, not against your memory of the product. The revised sentence is your work, not an automatic correction by the tool. Keep the original note fields if they remain useful, but do not assume changing a note will silently rewrite the finished description. Compose again only when you deliberately want another joined draft.

Give the open view and instruction card their own information

For the second image, the useful distinction is the inside arrangement. Write a subject such as “Open lunchbox viewed from above” and details such as “A removable divider separates a narrow compartment from a wider one.” Compose or draft the description, then inspect whether the divider is genuinely visible and whether the lid remains in frame. Do not repeat the first image’s opening-tab detail merely to make the entries similar. If you duplicated the first record to preserve shared context, replace its subject, details, description, and image reference deliberately. Duplication is a starting convenience, not a visual comparison or a reason to reuse an inaccurate sentence.

The third image needs a different treatment because words are its main content. Read the card yourself and enter “Lift tab to remove divider” in visible text. With “Instruction card beside the open lunchbox” as the subject and no additional details, Compose produces “Instruction card beside the open lunchbox. Image text: Lift tab to remove divider” using your supplied words. There is no OCR, so a missed word, a punctuation error, or an incorrect reading stays incorrect until you edit it. If the card contains additional essential instructions, transcribe and review them rather than assuming the composer has extracted everything from the attached preview.

Review the three entries in sequence. The closed view identifies the product, the open view explains the internal arrangement, and the card conveys an instruction printed in the image. Those roles give the set a useful progression without forcing every description into the same sentence shape. If the order changes, check references such as “shown next” or “as above” and remove them when they no longer help. A description should not depend on a reader guessing which earlier image you meant. The Carousel Maker can support a separate layout task, but designing or rearranging artwork there does not synchronize this description project.

Choose a length and placement that fit the actual destination

Set a working character target for each description if it helps you edit. The count uses Unicode code points, and the target is your chosen budget, not a platform limit or a quality score. Going over it prompts another look; staying below it does not establish that the description is useful. There is no universal 125-character rule in this writer. Remove unnecessary repetition before removing essential relationships or visible words. If a destination has a current field limit, check that destination separately and decide how to preserve the information elsewhere when a short field cannot reasonably hold the whole explanation.

Use the long-description field when the visual needs an extended explanation, such as a dense comparison chart or a diagram with several branches. A short description can identify the visual and its central relationship while a visible transcript, data table, or longer explanation carries the detail. The tool does not automatically insert that longer text into a native alt field or make it discoverable beside a post. Record the intended placement in publication notes and have the person assembling the post confirm it. The charts and text images guide develops this decision with different kinds of complex visuals.

Platform context is not identical native support across nine destinations. For Instagram, TikTok photos, Facebook, LinkedIn, Threads, and X, use image alt-text or description fields where available in the actual composer and supported format. For YouTube image posts or thumbnails, Reddit discussions or galleries, and Snapchat Stories, prepare useful descriptions and plan adjacent text or a production handoff without assuming a native custom alt editor. Visible wording alone does not guarantee screen-reader coverage. YouTube video subtitles and video captions elsewhere solve a different problem from still-image descriptions; use a separate subtitle workflow when the content is spoken or time-based.

Treat observations as prompts for a fresh human comparison

Read the review observations as a short editorial queue. Missing context asks whether the image’s role is clear. An empty long description for a chart or text image suggests considering additional explanation. An exact matching description elsewhere may reveal accidental duplication, but two genuinely equivalent images could also share wording. A character-target warning reports your budget, not a failed accessibility test. A missing description still needs writing. None of these observations compares the text with the visual, proofreads a transcription, detects an incorrect claim, or predicts how a person using assistive technology will experience the finished post.

For the lunchbox set, compare each final description with its own image and the intended caption. Ask whether the first view really shows the front right tab, whether the second shows a divider rather than a fixed wall, and whether the card’s wording has been copied accurately. Read the descriptions without the pictures as another editorial exercise, then return to the pictures to check your assumptions. Only after that comparison should you mark the item as manually reviewed. The declaration records your own check; it is not approval from the tool, an accessibility certification, an SEO score, or a screen-reader simulation.

Substantive changes clear the manual review declaration. Replacing an image, changing context, platform or purpose, or editing notes, descriptions, long descriptions, or publication notes requires another look. Renaming the label, moving the item, or adjusting its target alone does not erase the declaration. Even so, check the overall sequence after a move because its story may have changed. A reviewed flag imported from JSON is a historical user note, not evidence that the current image is attached. Reattaching a file clears review so the new visual can be checked. No software flag can replace your responsibility to compare the actual production asset with today’s wording.

Export one finished item or save the whole working set

A selected item’s TXT download or copy action requires its own nonblank label and description. Other records may remain unfinished, so you can hand off the closed lunchbox description while the instruction card is still being checked. The output is a brief containing the authored fields, context, review information, and filename reference, not just a clean native alt-field string. Read it before pasting anywhere public and select the actual description rather than internal notes. Whole-project CSV, copied plan, and PDF require a label and description for every item. Those are basic completeness checks, not a requirement that every optional field or review declaration be filled.

Download JSON to preserve a structurally valid draft even when descriptions are unfinished. Keep a dated version at meaningful milestones because there is no autosave, hidden recovery history, or direct transfer into SMTasker. The complete JSON import limit is 512 KiB. Opening a valid saved file restores written records and filename references, not the images, so reattach those manually before treating the project as visually reviewed. A rejected invalid import leaves the current project in place. Prefer JSON for reopening editable work; CSV is useful for a whole-set inventory, and plain text or clipboard output can be easier for an individual assignment.

The PDF is a styled raster review document and may include prepared previews attached in the current session. Its visible text is not selectable or searchable, and the document is not tagged. It includes a complete text-and-reference JSON attachment, but that attachment contains no image data and does not make the visible PDF an accessible, searchable document. Provide separate TXT, copy, CSV, or editable JSON according to the recipient’s needs, and send production images separately. PDF output has explicit limits of twelve pages and 20 MiB. If the set exceeds them, use the complete data exports rather than treating a partial visual report as a finished handoff.

Finish in the real publishing workflow and keep responsibilities clear

Give the person assembling the post the approved images, their ordered labels and identifiers, the selected descriptions, and any separate long explanation. Ask them to confirm which native fields exist for that account and format, where adjacent wording will appear, and whether the final crop still matches the description. The tool does not publish, write metadata into artwork, or attach text automatically to a downloaded image. It also cannot inspect the completed destination. A final placement check belongs in the actual workflow after the words and media have been put together, particularly when a platform treats a still photo and a video differently.

Keep the editable description project with the production record so changes can be handled deliberately. If the lunchbox lid color changes in a replacement photograph, update the relevant description and review it again; do not regenerate unrelated entries just for consistency. If the instruction card changes, compare the transcription word by word and revise any nearby explanation that depends on it. The image description review workflow shows how to divide those checks between a writer, visual reviewer, and publishing owner. Shared responsibility works best when each person knows which exact file and revision their declaration covers.

SMTasker is separate account automation using connected Android phones, a local Windows or macOS client, and a browser dashboard. Its nine-platform scope does not mean nine-platform publishing: supported publishing formats belong to Instagram, TikTok, Threads, Facebook, and LinkedIn. X provides Like, Follow, Comment, Unfollow, and Repost tasks; Reddit provides Upvote, Upvote comments, and Comment; Snapchat provides Add friends; YouTube offers Comment, Like, Shorts Viewer, Subscribe, and Video Viewer, not Publish. A five-day trial can help you evaluate a relevant supported routine. This free writer does not import descriptions into those tasks, promise alt-text publication, or turn an approved description set into scheduled posts.

Questions about writing image descriptions