Free SEO, Social Media & Image Tools

59 free tools for SEO professionals, social media teams, developers, and content creators. Audit your site, benchmark engagement, optimise thumbnails, generate structured files, and process images. All browser-based. No account, no upload, no limits.

8 SEO tools 11 social media tools 16 image tools 24 format converters 100% free, no signup

SEOWebster provides 59 free online tools for SEO professionals, developers, and content creators. Every tool runs entirely in your browser using HTML5 APIs. No account, no server upload, and no file size limits.

The toolset covers three areas: SEO analysis (site audits, SERP preview, Core Web Vitals testing, robots.txt and llms.txt generation, and local SEO scoring), social media growth (engagement benchmarking, YouTube thumbnail optimisation, and LinkedIn headline ideation), and image processing (format conversion and file compression across PNG, JPG, WebP, AVIF, GIF, SVG, BMP, and ICO). Choose a category below or browse all 59 tools.

SEO Tools

8 tools

Audit, analyse, and optimise your site's search presence.

Free AI SEO Audit Tool

AI-Powered

Enter any URL and get a 50-point technical SEO analysis powered by Gemini AI. Covers keyword gaps, Core Web Vitals, and on-page fixes.

Website Speed Test

Google API

Test Core Web Vitals (LCP, FID, CLS), page load time, and get actionable performance recommendations for any URL.

Meta Title & Description Checker

SERP Preview

Preview exactly how your title tag and meta description appear in Google search results. Live pixel-width validation, desktop and mobile view.

AI Robots.txt Generator

GEO

Generate a custom robots.txt that controls which AI crawlers (GPTBot, Google-Extended, ClaudeBot) can access your site.

llms.txt Generator

GEO

Create a structured llms.txt file to guide ChatGPT, Perplexity, and Claude to your best content. Improve your Generative Engine Optimization.

AI Local SEO Auditor

Local SEO

Score your local SEO, get a GBP checklist, NAP consistency audit, citation plan, and AI-generated keyword suggestions.

AI Blog Outline Generator

AI

Generate SEO-optimized blog outlines with H2s, H3s, FAQ sections and related keywords in seconds. Free, no signup. Works for any topic or industry.

301 Redirect Generator

Migration

Generate bulk 301 redirect rules for Apache .htaccess, Nginx, Netlify, Vercel JSON and CSV. Perfect for site migrations and URL restructures.

Social Media Tools

11 tools

Measure engagement, improve creative assets, and strengthen channel-level performance across social platforms.

AI Hashtag Generator

AI-Powered

Generate hashtags for Instagram, TikTok, YouTube, LinkedIn, X, Pinterest, and Facebook. AI categorizes results by reach tier (broad, niche, branded, long-tail) with platform-specific count guidance.

UTM Builder

Tracking

Build properly tagged campaign URLs in seconds with 15+ social, email, and offline presets. Live preview, validation, history, copy as CSV. GA4 compatible.

Engagement Rate Calculator

Analytics

Calculate engagement rate for Instagram, TikTok, YouTube, LinkedIn, X, and Facebook with benchmark comparisons and instant interpretation.

Social Media Character Counter

Multi-Platform

Count characters across Twitter, Instagram, LinkedIn, TikTok, YouTube, Facebook, Pinterest, and Threads with per-field limits and truncation preview.

Social Media ROI Calculator

Analytics

Calculate ROI, ROAS, CAC, CPM, CPC, and conversion rate from social ad campaigns with platform-specific benchmarks for Meta, TikTok, LinkedIn, Pinterest, and X.

LinkedIn Headline Generator

AI-Powered

Generate 5 recruiter-friendly LinkedIn headlines optimized for keyword visibility. AI-powered, no signup required.

YouTube Thumbnail Downloader

YouTube

Download any YouTube thumbnail in HD (up to 1280x720). Paste a YouTube URL and get every available size instantly.

YouTube Thumbnail Analyzer

YouTube

Upload a thumbnail or paste a YouTube URL to score contrast, text safety, aspect ratio, file weight, and mobile readability before publishing.

YouTube Money Calculator

YouTube

Estimate AdSense earnings by views, niche, and country. Realistic low, average, and high RPM ranges with a daily, monthly, and yearly breakdown.

TikTok Money Calculator

TikTok

Estimate Creator Rewards earnings plus brand-deal income from views, followers, niche, and country. Per-post, monthly, and yearly breakdown.

Social Media Image Resizer

Multi-Platform

Upload one image and instantly get every size for Instagram, Facebook, X, LinkedIn, YouTube, TikTok, and Pinterest. Download all 15 sizes as a ZIP.

Image Converters

9 tools

Convert images between formats in your browser. No server upload. Files stay on your device.

Image Converter

Hub

Convert images between any format (PNG, JPG, WebP, AVIF, GIF, SVG, BMP, ICO) directly in your browser. No upload.

PNG Converter

Convert PNG files to JPG, WebP, AVIF, GIF, PDF and more. Lossless quality, no file size limit, instant batch processing.

JPG / JPEG Converter

Convert JPG images to PNG, WebP, AVIF, SVG, PDF and more. Max-quality output, no watermarks, unlimited files.

WebP Converter

Convert WebP files to JPG, PNG, AVIF and other formats. Browser-based. Files never leave your device.

AVIF Converter

Next-Gen

Convert AVIF images to JPG, PNG, WebP for maximum compatibility. Next-gen format support built into your browser.

SVG Converter

Convert SVG files to PNG, JPG, WebP. Render vector graphics to any raster format at full resolution.

GIF Converter

Convert GIF images to PNG, JPG, WebP or AVIF. Reduce legacy GIF weight by up to 80% by converting to WebP.

BMP Converter

Convert BMP files (typically 10-20x larger than needed) to PNG or JPG. Reduce BMP file size by up to 95%.

ICO Converter

Convert ICO favicon files to PNG, JPG, or WebP. Extract favicon layers from .ico files instantly.

Image Compressors

7 tools

Reduce image file sizes with quality control. All processing happens locally. No upload required.

Image Compressor

Hub

Compress JPEG, PNG, WebP, GIF, AVIF, and SVG files with a quality slider. All processing is local. No upload.

JPEG Compressor

Compress JPEG photos with a quality slider. Typically 60–90% file size reduction with no visible quality loss.

PNG Compressor

Lossless

Lossless PNG compression. Reduces file size while preserving transparency and full image detail.

WebP Compressor

Compress WebP images with quality control. Ideal for reducing Core Web Vitals image weight before deployment.

GIF Compressor

Reduce GIF file sizes instantly. Best for reducing bandwidth cost of simple animations on web pages.

AVIF Compressor

Next-Gen

Compress images to AVIF, the smallest modern format. Best compression ratio available in any browser tool.

SVG Minifier

Remove SVG comments, whitespace, and unused metadata. Reduce SVG file size without any visual change.

Format-Pair Converters

24 converters

Dedicated pages for every conversion pair, each with technical comparison, use-case guide, and FAQ.

PNG → JPG PNG → WebP PNG → AVIF PNG → PDF JPG → PNG JPG → WebP JPG → AVIF JPG → PDF WebP → JPG WebP → PNG WebP → AVIF AVIF → JPG AVIF → PNG AVIF → WebP SVG → PNG SVG → JPG GIF → WebP GIF → PNG BMP → PNG BMP → JPG ICO → PNG PNG → GIF PNG → SVG JPG → GIF

100% Browser-Based

Every tool on this page processes data directly in your browser using HTML5 APIs. No file is ever uploaded to a server. Your data stays on your device, always.

No Account Required

Open any tool and start working immediately. No email, no trial period, no paywalled features. All tools are completely free with no usage limits.

Built for SEO Workflows

From technical audits to image optimisation, every tool is designed around real SEO tasks. Structured data schemas, canonical handling, and Core Web Vitals improvement built in.

Frequently Asked Questions

Are all these tools really free?
Yes. Every tool listed on this page is free to use with no signup, no usage cap, and no watermarks. SEOWebster builds browser-based tools that run on your device, there are no server costs per conversion, which is why we can keep everything free indefinitely.
Do any of these tools upload my files to a server?
No. All image conversion and compression tools use the browser's HTML5 Canvas API and FileReader API to process files locally. Your images are never sent over the network. The SEO audit and speed test tools send only the URL you provide (not your files) to third-party APIs like Google PageSpeed Insights.
What is the difference between a converter and a compressor?
A converter changes the format of an image (e.g. PNG to JPG). A compressor reduces the file size of an image while keeping the same format (e.g. a 2 MB JPEG compressed to 400 KB JPEG). Both tools process files locally in your browser.
What SEO and social media tools does SEOWebster offer?
Current SEO tools include AI SEO Audit, Website Speed Test, Meta Title & Description Checker, AI Robots.txt Generator, llms.txt Generator, AI Local SEO Auditor, AI Blog Outline Generator, and 301 Redirect Generator. Our Social Media Tools category includes Engagement Rate Calculator, LinkedIn Headline Generator, YouTube Thumbnail Downloader, and YouTube Thumbnail Analyzer.
Is there a file size limit on the image tools?
No server-imposed limit exists. Because all processing happens in your browser, the only limit is your device's available RAM. Most modern devices comfortably handle individual images up to 50–100 MB.