100 useful websites, sorted by what you need them for

Most lists of useful websites are long and unsorted. This one has 100 entries grouped by the job you want done, with one line on what each site does and what it costs.

Updated

How this list works

Every site here is free or has a free tier that covers the task described. Where the free tier has a limit that matters, the entry says so.

18 of the 100 are tools we build and host on this site. They are marked, they need no account, and they stay free. We list them next to the well-known options so you can pick whichever fits.

We checked every link on 1 October 2026.

Images and design

  1. 1.PhotopeaA Photoshop-style editor in the browser. It opens PSD, XCF, Sketch and Figma files. Free with ads.
  2. 2.Image CompressorOurs, free foreverShrinks PNG, JPG and WebP files in the browser. A slider sets the quality and the new size updates as you drag.
  3. 3.SquooshGoogle's image compressor. It shows the original and the compressed image side by side for one file at a time.
  4. 4.Background RemoverOurs, free foreverCuts the background out of a photo with a model that runs on your device. The photo is not uploaded.
  5. 5.UnsplashFree photos you can use in commercial projects without asking or crediting.
  6. 6.PexelsFree stock photos and stock video under a similar licence.
  7. 7.CoolorsPress the space bar to get a new colour palette. Lock the colours you like and keep going.
  8. 8.SVG OptimizerOurs, free foreverRemoves editor metadata and comments from SVG code and shows the size before and after.
  9. 9.SVG RepoMore than 500,000 free SVG icons and illustrations, searchable, with the licence shown on each.
  10. 10.ExcalidrawA whiteboard for hand-drawn style diagrams. No account, and a share link gives you live collaboration.
  11. 11.tldrawA fast whiteboard with shapes, arrows and sticky notes that works without signing in.
  12. 12.Google FontsAbout 1,800 open-source font families. Type your own text to preview and download the files.
  13. 13.Realtime ColorsShows your colour palette and fonts on a real page layout before you commit to them.
  14. 14.HEIC to JPG ConverterOurs, free foreverConverts iPhone HEIC photos to JPG in the browser, so the photos are not uploaded.

Files and PDFs

  1. 15.File ConverterOurs, free foreverConverts video, audio, PDF, images and data files such as JSON and CSV. The conversion runs on your device.
  2. 16.PDF24 ToolsMerge, split, compress, sign and convert PDFs. Free with no page limits.
  3. 17.iLovePDFThe same PDF jobs with a simpler interface. The free tier limits file size and batch size.
  4. 18.CloudConvertConverts more than 200 formats on its servers, which helps with the rare ones. A small number of conversions per day is free.
  5. 19.WebP to PNG ConverterOurs, free foreverTurns WebP images into PNG and keeps transparency. Useful when an app refuses WebP.
  6. 20.PairDropSend files between devices on the same network from the browser, like AirDrop for every platform.
  7. 21.SwissTransferSend files of up to 50 GB with a link. No account needed.
  8. 22.Wayback MachineShows how a web page looked in the past. Also saves a copy of a page on request.

Writing and research

  1. 23.DeepLTranslation that reads more naturally than most alternatives for European languages. The free version has a length limit.
  2. 24.LanguageToolGrammar and spelling checker for more than 30 languages. The core is open source.
  3. 25.Hemingway EditorHighlights long sentences, passive voice and adverbs. The web editor is free.
  4. 26.WikipediaStill the fastest way to get an overview of a topic, with sources at the bottom of each article.
  5. 27.OneLookA reverse dictionary. Describe a concept and it lists words that match.
  6. 28.EtymonlineThe origin and history of English words.
  7. 29.ZoteroBibPaste a URL, ISBN or DOI and get a citation in APA, MLA, Chicago and thousands of other styles.
  8. 30.Google ScholarSearch across academic papers, with links to free PDF versions when one exists.
  9. 31.Project GutenbergMore than 70,000 free ebooks whose US copyright has expired.
  10. 32.Open LibraryA catalogue page for every book, with digital lending for many of them.

Learning

  1. 33.Khan AcademyFree lessons and exercises in maths, science and economics, from primary school to early university.
  2. 34.MIT OpenCourseWareLecture notes, videos and exams from more than 2,500 MIT courses.
  3. 35.CS50Harvard's introduction to computer science. The full course is free online.
  4. 36.freeCodeCampA free coding curriculum with projects and certificates.
  5. 37.The Odin ProjectA free, project-based path to becoming a web developer.
  6. 38.roadmap.shDiagrams of what to learn, in order, for roles such as frontend, backend and DevOps.
  7. 39.DuolingoLanguage lessons in five-minute sessions. Free with ads.
  8. 40.DesmosA graphing calculator in the browser. Type an equation and see the curve.
  9. 41.WolframAlphaAnswers maths, unit and data questions by computing them. Step-by-step solutions need a paid plan.
  10. 42.AnkiFlashcards with spaced repetition. Free on desktop, Android and the web.

Code and development

  1. 43.MDN Web DocsThe reference for HTML, CSS and JavaScript, with examples and browser support tables.
  2. 44.Can I useShows which browser versions support a given web feature.
  3. 45.DevDocsDocumentation for hundreds of languages and libraries in one searchable interface that works offline.
  4. 46.regex101Write a regular expression, test it against sample text, and read an explanation of each part.
  5. 47.JSON Formatter and ValidatorOurs, free foreverFormats or minifies JSON and points to the line of a syntax error.
  6. 48.JSON Schema GeneratorOurs, free foreverTurns a JSON sample into a JSON Schema, in the strict shape LLM structured outputs need.
  7. 49.Random JSON GeneratorOurs, free foreverGenerates sample JSON from a preset or your own schema, with a seed for repeatable data.
  8. 50.crontab.guruType a cron expression and read in plain English when it runs.
  9. 51.explainshellPaste a shell command and see what each flag does, taken from the man pages.
  10. 52.CodePenTry HTML, CSS and JavaScript in the browser and share the result with a link.
  11. 53.StackBlitzA full Node.js development environment in a browser tab. Good for reproducing bugs.
  12. 54.HoppscotchAn open-source API client in the browser for REST, GraphQL and WebSocket requests.
  13. 55.transform.toolsConverts between code formats, such as JSON to TypeScript types or SVG to JSX.
  14. 56.BundlephobiaShows how many kilobytes an npm package adds to your bundle before you install it.
  15. 57.Compiler ExplorerShows the assembly a compiler produces for your C, C++, Rust or Go code.
  16. 58.DB FiddleRun SQL against MySQL, PostgreSQL or SQLite in the browser and share the query.

Running a website

  1. 59.PageSpeed InsightsGoogle's speed test. It reports Core Web Vitals from real users and lists what slows the page down.
  2. 60.Google Search ConsoleShows the searches your site appears for and the pages Google could not index.
  3. 61.Bing Webmaster ToolsThe same for Bing. It also covers Copilot and the other search engines that use Bing's index.
  4. 62.Meta Tags CheckerOurs, free foreverReads the title, description, Open Graph, Twitter and canonical tags of a URL and shows their lengths.
  5. 63.OG Image CheckerOurs, free foreverShows the image a link will display when someone shares it, and why it may be missing.
  6. 64.Google Indexing CheckerOurs, free foreverChecks a domain's robots.txt and sitemap together for the crawl problems that keep pages out of Google.
  7. 65.XML Sitemap ValidatorOurs, free foreverFetches a sitemap, counts its URLs and reports invalid XML and unreachable entries.
  8. 66.Robots.txt TesterOurs, free foreverReads your robots.txt and shows the allowed and blocked paths for each crawler.
  9. 67.UTM and URL Parameter GeneratorOurs, free foreverAdds UTM parameters to a link so analytics can tell which campaign sent the visit.
  10. 68.GEO and AI SEO CheckerOurs, free foreverChecks whether AI assistants can read your site: llms.txt, structured data and AI crawler access.
  11. 69.Rich Results TestGoogle's test for structured data. It shows which rich results a page qualifies for.
  12. 70.W3C Markup ValidatorChecks HTML for errors against the standard.
  13. 71.WebPageTestA detailed speed test from a location and device you choose, with a request waterfall and a filmstrip.
  14. 72.SSL Labs Server TestGrades the HTTPS configuration of a domain from A+ to F.
  15. 73.Security HeadersGrades the HTTP security headers a site sends and names the missing ones.
  16. 74.WAVEMarks accessibility problems on the page itself: missing alt text, low contrast, unlabelled form fields.
  17. 75.Google TrendsCompares how often people search for terms over time and by country.
  18. 76.DNS CheckerLooks up a DNS record from servers around the world, to see whether a change has spread.

Privacy and security

  1. 77.Have I Been PwnedEnter an email address to see which data breaches it appeared in.
  2. 78.VirusTotalScans a file or URL with more than 70 antivirus engines.
  3. 79.BitwardenAn open-source password manager. The free plan syncs unlimited passwords across devices.
  4. 80.Privacy GuidesRecommendations for private browsers, email, VPNs and messengers, written by volunteers with no affiliate links.
  5. 81.Terms of Service; Didn't ReadGrades the terms of popular services and summarises the clauses that matter.
  6. 82.JustDeleteMeDirect links to the account deletion page of hundreds of services, rated by difficulty.
  7. 83.Cover Your TracksThe EFF's test of how well your browser resists tracking and fingerprinting.
  8. 84.SimpleLoginEmail aliases that forward to your inbox, so a site never gets your real address. The free plan has 10 aliases.

Audio, video and game assets

  1. 85.AudioMassAn open-source audio editor in the browser for trimming, fading and exporting MP3.
  2. 86.OpenCutAn open-source video editor in the browser with a timeline and no watermark.
  3. 87.Vocal RemoverSplits a song into a vocal track and an instrumental track.
  4. 88.FreesoundA database of sound effects and recordings under Creative Commons licences.
  5. 89.Poly HavenHDRIs, textures and 3D models in the public domain. No account and no attribution needed.
  6. 90.KenneyThousands of public-domain game sprites, 3D models, sounds and UI packs.
  7. 91.Sprite Sheet PackerOurs, free foreverPacks separate sprites into one texture atlas with a data file for Unity or Godot.
  8. 92.Normal Map GeneratorOurs, free foreverMakes a normal map from a height map or a photo, for OpenGL or DirectX.

Everyday life

  1. 93.AlternativeToName an app and get a list of alternatives, filtered by platform and licence.
  2. 94.Time.isThe exact time for any place, and how far off your own clock is.
  3. 95.World Time BuddyLines up several time zones in a grid to find a meeting hour that works for everyone.
  4. 96.When2meetEveryone paints the hours they are free and the overlap shows up. No account.
  5. 97.Jitsi MeetOpen-source video calls in the browser. Guests join with a link.
  6. 98.iFixitStep-by-step repair guides with photos for phones, laptops and appliances.
  7. 99.WindyA live weather map with wind, rain, waves and several forecast models.
  8. 100.Our World in DataCharts on health, energy, population and poverty, with the data free to download.

How to suggest a website

The directory on this site holds more websites than this list and accepts submissions. A person reviews each one before it goes in.

We update this page when a site closes, changes its pricing, or a better option appears.

Tools for this guide

All tools →
Image CompressorReduce image file size without losing quality. Compress PNG, JPG, and WebP images locally in your browser for maximum privacy and speed.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.JSON Formatter & ValidatorClean, format, and validate messy JSON data instantly. All processing is done locally in your browser for privacy.Meta Tags CheckerInspect all meta tags including title, description, Open Graph, Twitter cards, and canonical URL.UTM & URL Parameter GeneratorAdd UTM parameters to any URL and copy a clean campaign link for emails, ads and social posts.AI Background RemoverRemove image backgrounds instantly and privately. Uses AI to detect the subject and erase the background entirely in your browser.

More guides

All guides →
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.GuideHow to Compress Images for the Web Without Losing QualityPick the right format, resize before you compress, and choose a sensible quality setting. A short, practical guide to smaller images that still look sharp.