Free online tools that do one job well
26 free tools for SEO, images and JSON. Pick one, get the answer, move on — no signup and no watermark.
- Free
- No signup
- 17 tools run in your browser
SEO tools
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GEO & AI SEO CheckerCheck if your website is optimized for AI search engines like ChatGPT and Perplexity (checks llms.txt, robots.txt, and schema).
Open Graph Image CheckerInspect a page's Open Graph and Twitter card image setup before you share it.Meta Tags CheckerInspect all meta tags including title, description, Open Graph, Twitter cards, and canonical URL.
Favicon CheckerCheck for favicon, apple-touch-icon, and web app manifest configuration.
Robots.txt TesterAnalyze the robots.txt file at the domain root for sitemap references and crawl rules.
XML Sitemap ValidatorValidate the sitemap.xml file and check URL count and structure.Canonical URL CheckerCheck if the canonical URL tag is properly set and matches the final URL.
Google Indexing CheckerCheck robots.txt and sitemap.xml together to spot indexing issues before Google does.On-Page SEO CheckerRun one complete check for metadata, canonical tags, robots.txt, and sitemap signals.Image tools
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Image CompressorReduce image file size without losing quality. Compress PNG, JPG, and WebP images locally in your browser for maximum privacy and speed.
AI Background RemoverRemove image backgrounds instantly and privately. Uses AI to detect the subject and erase the background entirely in your browser.SVG OptimizerClean up and minify SVG code to reduce file size. Strips redundant tags, comments, and metadata while keeping your graphics intact.File ConverterConvert videos, audio, PDFs, images and data files between formats in your browser. MP4, MOV, MP3, PDF, PNG, HEIC, JSON, CSV and more, with nothing uploaded.WebP to PNG ConverterConvert WebP images to PNG in your browser, with transparency kept and nothing uploaded.PNG to WebP ConverterConvert PNG images to WebP in your browser for much smaller files, transparency included.JPG to WebP ConverterConvert JPG and JPEG photos to WebP in your browser to save space without uploading anything.HEIC to JPG ConverterConvert iPhone HEIC and HEIF photos to JPG in your browser so they open anywhere.Simple Blog Banner MakerMake a blog banner from a title and a colour or your own photo. Download a PNG or JPG with no watermark.Developer tools
View all →JSON Formatter & ValidatorClean, format, and validate messy JSON data instantly. All processing is done locally in your browser for privacy.
JSON Schema GeneratorPaste JSON and get a JSON Schema for it. Built for LLM structured outputs, API validation and docs.Random JSON GeneratorGenerate random sample JSON from a preset or your own JSON Schema, with a seed for repeatable data.Game dev tools
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Sprite Sheet PackerPack loose PNG sprites into one texture atlas with a JSON, XML or Godot coordinate map. Trim, pad and extrude in your browser, with no uploads.
Normal Map GeneratorTurn a height map or any texture into a tangent-space normal map. Adjust strength, pick OpenGL or DirectX and keep it tileable, all in your browser.
Texture Channel PackerCombine metallic, AO, roughness and smoothness maps into the RGBA channels of one texture. Presets for Unity HDRP, URP and ORM. Runs in your browser.
Cubemap Texture GeneratorBuild a Unity skybox cubemap from six face images. Exports strip and cross layouts in your browser.Marketing tools
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Tools by job
Collections for a specific task or role, each with the tools that fit.
Free SEO ToolsSmall, focused checkers for the technical SEO basics. Paste a URL, get a clear answer, fix what is broken.10 toolsFree Image ToolsCompress, convert and clean up images without uploading them. Every tool on this page runs on your own device.9 toolsFree Game Dev ToolsThe texture chores between your art tool and your engine: pack the sprites, bake the normals, combine the maps, build the skybox.4 toolsFree Tools for DevelopersThe small utilities you reach for mid-task: format a payload, generate a schema, clean an SVG, sanity-check a deploy.10 toolsFree Tools for MarketersCheck a landing page before the campaign goes out: tracked links, share previews, and the on-page basics.7 toolsFree Tools for DesignersFinish the handoff: cut out a subject, shrink the exports, clean the SVGs, and check the icons and share image on the live site.9 tools
Guides
Short, practical explanations of the problems these tools solve.
Guide100 useful websites, sorted by what you need them forA list of 100 useful websites for images, files, writing, learning, code, site owners, privacy and everyday tasks. Every link checked in October 2026.Guide24 useful web tools that work without an accountA list of useful web tools you can open and use right away: no account, no install, no watermark. Grouped by images, data, site checks and everyday jobs.GuideHow to build a campaign URL for Google Analytics 4How to build a campaign URL for Google Analytics 4: which UTM parameters to add, a worked example, where the data shows up in GA4, and when not to tag.
Useful websites and links
Beyond our own tools: lists of useful websites, sorted by the job you need done.
100 useful websitesA list of 100 useful websites for images, files, writing, learning, code and everyday tasks.Useful web tools with no signup24 tools you can open and use right away, with no account and no watermark.Directory of useful linksHelpful websites and products from other makers, each checked by hand.
Looking for something we have not built?
The directory is a hand-picked list of useful websites and products from other makers.