# Free Alt Text Generator for Social Media Images **Source:** https://posteverywhere.ai/tools/alt-text-generator --- [](https://app.posteverywhere.ai/signup?utm_source=tools&utm_medium=share_rail)[](https://twitter.com/intent/tweet?url=https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator&text=Alt%20Text%20Generator%20-%20free%20tool%20by%20PostEverywhere)[](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator)[](https://www.threads.net/intent/post?text=Alt%20Text%20Generator%20-%20free%20tool%20by%20PostEverywhere%20https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator)[](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator&description=Alt%20Text%20Generator%20-%20free%20tool%20by%20PostEverywhere)[](https://www.reddit.com/submit?url=https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator&title=Alt%20Text%20Generator%20-%20free%20tool%20by%20PostEverywhere)[](https://bsky.app/intent/compose?text=Alt%20Text%20Generator%20-%20free%20tool%20by%20PostEverywhere%20https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator)[](https://t.me/share/url?url=https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator&text=Alt%20Text%20Generator%20-%20free%20tool%20by%20PostEverywhere)[](https://chatgpt.com/?q=Read%20https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator%20then%20summarize%20the%20key%20points%20and%20answer%20any%20questions%20I%20have%20about%20it.)[](https://claude.ai/new?q=Read%20https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator%20then%20summarize%20the%20key%20points%20and%20answer%20any%20questions%20I%20have%20about%20it.)[](https://www.perplexity.ai/search?q=Read%20https%3A%2F%2Fposteverywhere.ai%2Ftools%2Falt-text-generator%20then%20summarize%20the%20key%20points%20and%20answer%20any%20questions%20I%20have%20about%20it.)Free Tool # Alt Text Generator for Social Media Images Create descriptive, accessible alt text for your social media images in seconds. Improve accessibility, boost SEO, and reach more people across all platforms. PlatformInstagramLinkedInX / TwitterFacebookPinterestSubject *Action (optional)Setting / Location (optional)Style / Mood (optional)Generate Alt TextAlt Text Best Practices: - Be specific and concise - Don't start with "image of" or "picture of" - Avoid keyword stuffing or hashtags - Keep it under 100 characters for Instagram Your alt text will appear here Fill in the subject field (required) and any optional details, then hit **Generate Alt Text** to see 5 variations. ## What is Alt Text? Alt text (alternative text) is a written description of an image that serves three critical purposes: accessibility for visually impaired users who rely on screen readers, SEO for search engines and platform algorithms that can't "see" images, and fallback content when images fail to load. Every major social platform now supports alt text, including Instagram, LinkedIn, X (Twitter), Facebook, and Pinterest. Adding descriptive alt text to your images helps you reach a wider audience and improves your content's discoverability in search results and platform recommendations. Our free alt text generator creates five variations for each image description, from concise to detailed, so you can choose the style that best fits your platform and content strategy. Pair it with our [AI image generator](https://posteverywhere.ai/ai-image-generator) and [social media scheduler](https://posteverywhere.ai/social-media-scheduler) to streamline your entire content workflow. ## Why Alt Text Matters - **Accessibility:** 15% of the global population has some form of disability. Alt text ensures your content is accessible to screen reader users, making your brand more inclusive. - **SEO & Discoverability:** Search engines and social algorithms index alt text. Well-written descriptions help your images appear in search results and platform recommendations. - **User Experience:** When images fail to load (slow connections, broken links), alt text displays in place of the image so users still understand the content. - **Legal Compliance:** In some jurisdictions, websites and apps must provide accessible content. Alt text is a key component of WCAG (Web Content Accessibility Guidelines) compliance. - **Brand Reputation:** Brands that prioritize accessibility build trust and loyalty with a broader audience, demonstrating social responsibility and inclusivity. ## Platform-Specific Alt Text Guidelines InstagramInstagram allows up to 100 words (approximately 500 characters) but recommends brevity. Focus on describing the visual elements that matter most. To add alt text, tap "Advanced Settings" before posting, then "Write Alt Text." Alt text improves content discovery in Explore and Search. Schedule [Instagram posts](https://posteverywhere.ai/instagram-scheduler) with alt text using PostEverywhere. LinkedInLinkedIn supports up to 300 characters of alt text and actively encourages its use for accessibility. LinkedIn's algorithm uses alt text to categorize and recommend posts. To add it, upload your image, click the pencil icon, then add your description. Professional photos benefit from detailed alt text mentioning context, industry, and setting. Use a [LinkedIn scheduler](https://posteverywhere.ai/linkedin-scheduler) to batch-add alt text. X / TwitterX (Twitter) supports up to 1,000 characters of alt text, though best practice is to keep it under 200 characters. To add alt text, upload your image, click "Add description," and enter your text. X's search and recommendation algorithms index alt text. Use concise, keyword-rich descriptions for better discoverability. Manage your content with an [X scheduler](https://posteverywhere.ai/x-scheduler). FacebookFacebook recommends keeping alt text under 200 characters for optimal screen reader experience. To add it, click "Edit Photo" after uploading, then "Alternative Text." Facebook auto-generates alt text using AI, but custom descriptions are more accurate and boost engagement. Avoid keyword stuffing, which Facebook flags as spam. PinterestPinterest allows up to 500 characters of alt text and heavily relies on it for search and recommendations. Pinterest is a visual search engine, so detailed, keyword-rich alt text significantly improves Pin performance. To add alt text, edit your Pin and scroll to the "Alt text" field. Focus on describing the image's content, context, and purpose. ## Alt Text Best Practices ### Do This - •Be specific and concise: "Woman in blue dress speaking at conference" - •Describe the image objectively, focusing on relevant details - •Include important context: setting, people, objects, text in image - •Front-load key information (subject, action) in the first few words - •Use natural language that flows like a sentence - •Keep it under the platform's character limit ### Avoid This - •Starting with "image of" or "picture of" (redundant for screen readers) - •Being vague: "nice photo" or "beautiful scene" adds no value - •Keyword stuffing for SEO: ruins accessibility and looks spammy - •Including hashtags, emojis, or promotional copy in alt text - •Writing subjective opinions: "stunning sunset" vs. "sunset over ocean" - •Describing decorative images (mark those as decorative instead) ## Alt Text Examples: Bad vs. Good Bad Example"Image of a nice photo" Too vague, adds no information for screen reader users. Bad Example"coffee shop latte barista espresso cafe morning coffee beans #coffee #latte #morningvibes" Keyword stuffing with hashtags ruins accessibility. Good Example"Barista pouring latte art into white ceramic mug at coffee shop counter" Specific, descriptive, and includes relevant details. Good Example"Woman in yellow blazer presenting to audience of 20 people in modern conference room" Objective, concise, and provides context for the scene. ## How to Use the Alt Text Generator 1 ### Select your platform Choose Instagram, LinkedIn, X, Facebook, or Pinterest to see the recommended character limit and best practices for that platform. 2 ### Describe your image Enter the subject (required), plus optional details like action, setting, and style/mood to create a complete description. 3 ### Generate & copy Get 5 alt text variations from concise to detailed. Pick the one that best fits your image and copy it to your clipboard in one click. ## Alt Text Generator FAQ What is alt text and why does it matter?▾Alt text (alternative text) is a written description of an image that appears when the image fails to load or is read aloud by screen readers for visually impaired users. It matters for three reasons: accessibility (helps people with visual impairments understand image content), SEO (search engines index alt text to understand images), and user experience (displays when images fail to load or on slow connections).How long should alt text be?▾The ideal length varies by platform. X recommends under 1,000 characters but suggests concise descriptions. Instagram allows up to 100 words. LinkedIn supports up to 300 characters. Pinterest allows 500 characters. As a general rule, aim for one to two sentences (50-150 characters) that clearly describe what's in the image without unnecessary detail.Should I include hashtags in alt text?▾No. Alt text is for describing the visual content of an image, not for marketing or discovery. Including hashtags, keyword stuffing, or promotional language makes alt text less useful for screen reader users and can be flagged as spam by platforms. Focus on accurate, descriptive text that explains what's in the image. Use your post caption for hashtags and promotional copy.Does alt text help with SEO and discoverability?▾Yes. Search engines and social platforms index alt text to understand image content. On LinkedIn and Pinterest especially, well-written alt text can help your images appear in search results and recommendations. Instagram also uses alt text for its Explore algorithm. However, the primary purpose of alt text should always be accessibility, with SEO as a secondary benefit.What should I avoid when writing alt text?▾Avoid starting with 'image of' or 'picture of' (screen readers already announce it's an image), being vague ('nice photo'), including personal opinions ('beautiful sunset'), keyword stuffing for SEO, using all caps, adding emojis, describing decorative images (mark those as decorative instead), and making alt text longer than necessary. Keep it objective, concise, and descriptive.How do I add alt text to social media images?▾On Instagram, tap 'Advanced Settings' before posting, then 'Write Alt Text.' On X/Twitter, upload your image, click 'Add description,' and enter your alt text. On LinkedIn, upload your image, click the pencil icon, and add alt text. On Facebook, click 'Edit Photo' after uploading, then 'Alternative Text.' On Pinterest, edit your Pin and scroll to the 'Alt text' field. Most scheduling tools including PostEverywhere also support adding alt text before publishing.Can I use this tool for all my social media images?▾Yes. This tool generates alt text variations optimized for Instagram, LinkedIn, X/Twitter, Facebook, and Pinterest. Each platform has different character limits and conventions, so switch the platform selector to see tailored recommendations. You can also use these descriptions for blog images, website graphics, and email newsletters.Is there a difference between alt text and captions?▾Yes. Alt text is a hidden description read by screen readers and indexed by search engines but not visible to sighted users. Captions are visible text that appears below or alongside an image for all users. Alt text should objectively describe what's in the image, while captions can include context, humor, calls-to-action, and hashtags. Both serve different purposes and should be used together. ## More Free Tools [Image ResizerResize images for any platform](https://posteverywhere.ai/tools/image-resizer)[Instagram Image ResizerPerfect Instagram dimensions](https://posteverywhere.ai/tools/instagram-image-resizer)[Caption AnalyzerScore your captions](https://posteverywhere.ai/tools/caption-analyzer)[Hashtag GeneratorFind trending hashtags](https://posteverywhere.ai/tools/hashtag-generator)Done with the tool? Now publish it everywhere. Write once and schedule to all 11 platforms from a single dashboard, with a visual calendar and caption generation built into the editor. - Instagram - TikTok - LinkedIn - YouTube - X - Facebook - Pinterest - Threads - Bluesky - Discord - Telegram [Start your free trial](https://app.posteverywhere.ai/signup?utm_source=tools&utm_medium=cta)7 day free trial. Cancel anytime. Want to grow your social media presence? - Publish to 11 platforms at once - Schedule a month ahead - Track what works in one place [Start your free trial](https://app.posteverywhere.ai/signup?utm_source=tools&utm_medium=hero_panel&utm_content=alt-text-generator)7 day free trial. Cancel anytime. **2,831** [4.8/5 on G2](https://www.g2.com/products/posteverywhere/reviews)