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Free research tools
Small, free tools for checking facts, sources and writing. Most run entirely in your browser.
105 free tools
Text & Writing
- Word & Character CounterCount words and characters and estimate reading time.Runs in your browser
- Character CounterMeasure text length and character counts.Runs in your browser
- Text Cleaner & Case Converter: Fix Copied TextClean copied text and change its capitalization.Runs in your browser
- Free Text Compare: See Differences Between Two TextsSee which words changed between two versions.Runs in your browser
- Two-Text Similarity CheckerCompare overlap between two text passages.Runs in your browser
- Readability ScorerEstimate how easy a passage is to read.Runs in your browser
- Passive Voice & Hedge DetectorHighlight possible passive phrasing and hedging.Runs in your browser
- Weasel Word DetectorFind vague wording that may need clearer support.Runs in your browser
- Cliché & Filler DetectorFlag common clichés and filler phrases.Runs in your browser
- Sentence Rhythm AnalyzerCompare sentence lengths and their variation.Runs in your browser
- Keyword Density CheckerMeasure how often terms appear in your text.Runs in your browser
- Title Case ConverterChange title capitalization using supported styles.Runs in your browser
- Slug & URL EncoderTurn a title into a URL-friendly slug.Runs in your browser
- Invisible Character DetectorFind hidden characters in pasted text.Runs in your browser
- Markdown Editor & PreviewWrite and preview Markdown text.Runs in your browser
- Free Headline Analyzer: Length, Clickbait and Absolute ClaimsCheck length, clickbait phrasing and absolute claims.Runs in your browser
- SERP & Open Graph PreviewPreview a page title and description as a search snippet.Runs in your browser
- No-AI Text SummarizerSelect key sentences using word frequency. No AI; see every selected sentence.Runs in your browser
- Word Frequency & N-gram CounterFind frequent words and phrases with an optional stopword filter.Runs in your browser
- Acronym ExtractorFind likely acronyms in text and show their surrounding context.Runs in your browser
Research & Citations
- Free DOI & Retraction CheckerCheck DOI records for listed retractions or corrections.Looks up public registries
- Free DOI Citation Generator: APA, MLA, Chicago, HarvardTurn DOIs into references in six citation styles.Looks up public registries
- ISBN Book CiterFind book metadata using an ISBN.Looks up Open Library
- arXiv Paper FinderSearch arXiv for research preprints.Looks up the public arXiv registry
- PubMed LookupRetrieve publication details from PubMed.Looks up the public PubMed registry
- Reference Format ConverterConvert reference data between supported formats.Runs in your browser
- Citation Reference CheckerGratis met een Verfiai-account: controleer referenties op metadata, intrekkingsmeldingen en citatierisico's.Je moet gratis bij Verfiai inloggen om resultaten van de openbare bron op te halen.
- Wikipedia Article Citation FormatterLook up a Wikipedia article and format a basic citation from its metadata.Uses a public keyless API
- Open Access Paper FinderCheck OpenAlex and Unpaywall for a legal open-access copy of a DOI.Uses a public keyless API
- Scholarly Works SearchSearch OpenAlex for scholarly works; results are cached per query this session.Uses a public keyless API
- bioRxiv & medRxiv Preprint FinderSearch recent bioRxiv and medRxiv metadata from their public APIs.Uses a public keyless API
- Connected PapersOpens an external free tool: a paper title search on Connected Papers.Opens an external free tool
- Google Scholar SearchOpens an external free tool: a title or author search in Google Scholar.Opens an external free tool
- DOAJ-tijdschriftcheckerControleer of een tijdschrift of artikel is opgenomen in de Directory of Open Access Journals.Queries the public DOAJ API from your browser
- Semantic Scholar zoekenZoek wetenschappelijke artikelen en auteurs met citaties, jaartal, publicatiekanaal en open-accesslinks.Queries the public Semantic Scholar API from your browser
- OpenCitations DOI-verkennerBekijk inkomende citaties en referenties voor een DOI met OpenCitations.Queries the public OpenCitations API from your browser
- Dataset- en DOI-zoekerZoek datasets op Zenodo en haal DOI-metadata op via DataCite.Queries public Zenodo and DataCite APIs from your browser
- Engels woordenboekZoek Engelse definities, woordsoorten, synoniemen, antoniemen en uitspraak op.Uses the keyless Free Dictionary API
Verification & OSINT
- Claim SpotterFind checkable claims and vague or absolute wording in text.Runs in your browser
- Claim Evidence MatrixOrganize excerpts and compare how sources relate to a claim.Runs in your browser
- Logical Fallacy SpotterFlag wording that may signal a reasoning fallacy.Runs in your browser
- Source Evaluation ChecklistReview a source's authorship, evidence and transparency.Runs in your browser
- Printable Evaluation ChecklistPrint a source evaluation worksheet for offline review.Runs in your browser
- Spot the Fake HeadlineTest your eye for misleading framing in a scored quiz.Runs in your browser
- Misinformation GlossaryBrowse plain-language definitions of reasoning and source-checking terms.Static reference
- Phishing Red-Flag ChecklistWork through a manual review of suspicious messages.Runs in your browser
- Link ExpanderFollow redirects to inspect a link's destination.Requests the linked website from your browser
- Photo Check: View Photo Metadata and Reverse Image SearchRead photo metadata and open reverse image searches.Metadata stays in your browser; search links open external services
- GDELT News Coverage SearchSearch GDELT's public news index with a single paced request per search.Je moet gratis bij Verfiai inloggen om resultaten van de openbare bron op te halen.
- Google Fact Check ExplorerOpens an external free tool: a prefilled Google Fact Check Explorer search.Opens an external free tool
- InVID-WeVerify Video VerificationOpens an external free tool: the InVID-WeVerify verification toolkit guide.Opens an external free tool
- Image Forensics ToolsOpens external free tools: FotoForensics and Forensically image checks.Opens an external free tool
- DNS-inspectieBekijk openbare A-, AAAA-, MX-, TXT-, NS-, CNAME- en SOA-DNS-records.Queries Cloudflare DNS-over-HTTPS from your browser
- CertificaatverkennerBekijk openbare TLS-certificaten, uitgevers, datums en gevonden subdomeinen.Queries the public crt.sh certificate database
- TelefoonnummercontroleParseer en valideer telefoonnummers lokaal, met land, type en E.164-indeling.Validates locally; no network request
- IP-adrescontroleControleer je openbare IP-adres of zoek een IP-adres, locatie, organisatie en ASN op.Uses the keyless ipwho.is public API
- VideoresearchgidsPraktische gids voor onderzoek naar videotranscripten, controle van citaten en het vinden van de oorspronkelijke upload.Static guide
- Informatie controlerenPraktische antwoorden op veelgestelde vragen over foto's, bronnen, citaten en online beweringen.Static guide
- Gratis onderzoekssjablonen en verificatiegidsenDownload checklists en logboeken voor beweringen, bewijs, citaten en naleving.Static guide
Data & Numbers
- Numbers-in-News CheckerInspect numerical claims for issues worth checking.Runs in your browser
- Sample Size CalculatorEstimate a survey sample size from your assumptions.Runs in your browser
- CSV to JSON ConverterConvert structured data between CSV and JSON.Runs in your browser
- Timestamp ConverterConvert timestamps and readable dates.Runs in your browser
- Date & Deadline CalculatorCalculate days between dates, weekdays, and future deadlines.Runs in your browser
- Polling Margin of Error CalculatorEstimate a poll's margin of error from its sample size and proportion.Runs in your browser
- Eenheden omrekenenReken lengte, gewicht, temperatuur, snelheid, oppervlakte, volume en datagrootte offline om.Calculates offline in your browser
- Valuta omrekenenReken valuta om met gratis openbare Frankfurter-koersen, ook voor historische datums.Uses the keyless Frankfurter public API
- PercentagecalculatorBereken een percentage van een waarde, een percentageaandeel of een procentuele wijziging.Calculates offline in your browser
- RekenmachineEen eenvoudige rekenmachine met toetsenbordondersteuning.Calculates offline in your browser
- Leeftijd- en datumcalculatorBereken leeftijd, dagen tussen datums of tel kalenderdagen op en af.Calculates offline in your browser
Email & Communication
- Subject Line PreviewPreview email subject lines and their length.Runs in your browser
- Email Header AnalyzerInspect pasted email headers for useful clues.Runs in your browser
- Disposable Email CheckerCheck an email domain against a disposable-domain list.Runs in your browser
- Mailto Link BuilderBuild an email link with subject and message fields.Runs in your browser
- Speech-to-Text DictationTranscribe speech with your browser's recognition service.Uses browser speech recognition; processing depends on the browser
- Text-to-Speech ReaderRead text aloud with available browser voices.Uses your browser's speech service
Developer & Utilities
- URL InspectorInspect a URL's structure and parameters.Runs in your browser
- File Hash VerifierCalculate a file digest without uploading the file.Runs in your browser
- QR Code GeneratorCreate a QR code from text or a URL.Sends entered text to the public QR Server service
- Password GeneratorGenerate random passwords in your browser.Runs in your browser
- Quote Card GeneratorFormat a quote and attribution as a shareable card.Runs in your browser
- Regex TesterTest a regular expression live and explore common pattern examples.Runs in your browser
- Cron Expression ExplainerExplain common five-field cron schedules and preview upcoming run times.Runs in your browser
- Color Contrast CheckerCheck WCAG contrast ratios and AA/AAA text accessibility thresholds.Runs in your browser
- QR Code ScannerRead a QR code from an image or camera in your browser.Runs in your browser
- Encode, Decode & SHA-256Encode Base64 or URL text and calculate a SHA-256 text digest locally.Runs in your browser
Productivity
- FOI Request GeneratorDraft a request for access to public information.Runs in your browser
- Random Picker & ShufflerChoose randomly from a list of options.Runs in your browser
- Pomodoro TimerTime focus sessions and breaks.Runs in your browser
- PDF Merge, Split & RotateWork with PDF files using browser-based utilities.Runs in your browser
- Image Compressor & ResizerCompress or resize JPG, PNG, and WebP images locally in your browser.Runs in your browser
- Image Text Extractor (OCR)Extract text from an image on-device with a lazily loaded OCR engine.Runs in your browser
- SRT Subtitle Timing ShifterShift subtitle timestamps by a fixed offset and correct SRT timing format.Runs in your browser
- FlashcardmakerMaak privé-flashcardsets en herhaal, schud en volg bekende kaarten lokaal.Saved only in your browser
- Stopwatch en timerGebruik een stopwatch met rondetijden of een visuele afteltimer.Runs locally in your browser
- KladnotitiesSchrijf privénotities met automatisch opslaan en exporteer ze als tekstbestand.Saved only in your browser
- Gratis vertalerVertaal tekst met de ingebouwde vertaler van je apparaat of de gratis MyMemory-API.On-device first; keyless MyMemory fallback
- TranscriptvertalerVertaal een transcript lokaal indien mogelijk of naast elkaar met een gratis API zonder sleutel.On-device first; keyless MyMemory fallback
Professional Sources
- ORCID Author LookupFind public researcher records by ORCID identifier.Looks up the public ORCID registry
- Wayback Machine CheckerLook for an archived capture of a web page.Looks up Internet Archive
- Domain Age CheckerLook up public domain registration information.Looks up public RDAP registration records
- Wikidata Entity LookupSearch Wikidata for entity labels, descriptions, and item identifiers.Uses a public keyless API
- Europe PMC Open Access ReaderFind biomedical articles and open available full text from Europe PMC.Uses a public keyless API
- SEC Filings Full-Text SearchSearch SEC EDGAR filing text for public company disclosures.Je moet gratis bij Verfiai inloggen om resultaten van de openbare bron op te halen.
- World Bank Data LookupLook up official country statistics using World Bank indicator codes.Uses a public keyless API
Research templates and verification guides
Download practical checklists and logs for claims, evidence, citations, and compliance. Browse free research templates and guides ↗
Executive tools directory
Explore a curated directory of external services for company research, media monitoring, documents, reporting, meetings and professional communication. Browse executive tools ↗
What these tools do not do
None of these tools tells you whether text was written by AI, and none of them proves that something is true. They point you to what is worth checking and show the evidence they found. Tools that look things up use public registries and have fair-use limits.