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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 CheckerVerfiai 로그인 후 무료로 이용: 참고문헌 메타데이터, 철회 공지 및 인용 위험을 확인하세요.공개 출처에서 결과를 가져오려면 Verfiai 무료 로그인이 필요합니다.
- 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 저널 확인기저널이나 논문이 Directory of Open Access Journals에 등재되어 있는지 확인합니다.Queries the public DOAJ API from your browser
- Semantic Scholar 검색인용, 연도, 게재처, 오픈 액세스 링크와 함께 학술 논문과 저자를 찾습니다.Queries the public Semantic Scholar API from your browser
- OpenCitations DOI 탐색기OpenCitations에서 DOI의 인용 내역과 참고문헌을 살펴봅니다.Queries the public OpenCitations API from your browser
- 데이터셋 및 DOI 찾기Zenodo 데이터셋을 검색하고 DataCite에서 DOI 메타데이터를 조회합니다.Queries public Zenodo and DataCite APIs from your browser
- 영어 사전영어 정의, 품사, 동의어, 반의어 및 발음을 찾아봅니다.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.공개 출처에서 결과를 가져오려면 Verfiai 무료 로그인이 필요합니다.
- 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 검사기공개 A, AAAA, MX, TXT, NS, CNAME, SOA DNS 레코드를 확인합니다.Queries Cloudflare DNS-over-HTTPS from your browser
- 인증서 탐색기공개 TLS 인증서의 이력, 발급자, 날짜 및 발견된 하위 도메인을 확인합니다.Queries the public crt.sh certificate database
- 전화번호 검증기국가, 유형, E.164 형식을 포함해 전화번호를 로컬에서 파싱하고 검증합니다.Validates locally; no network request
- IP 주소 확인기공인 IP를 확인하거나 IP 주소, 위치, 조직 및 ASN을 조회합니다.Uses the keyless ipwho.is public API
- 동영상 조사 가이드동영상 대본을 조사하고 인용을 확인하며 원본을 찾는 실용적인 안내입니다.Static guide
- 정보 확인 방법사진, 출처, 인용 및 온라인 주장을 확인하는 일반적인 질문에 실용적으로 답합니다.Static guide
- 무료 연구 템플릿 및 검증 가이드주장, 증거, 인용 및 규정 준수를 위한 체크리스트와 기록지를 다운로드하세요.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
- 단위 변환기길이, 무게, 온도, 속도, 면적, 부피 및 데이터 크기를 오프라인으로 변환합니다.Calculates offline in your browser
- 통화 변환기무료 공개 Frankfurter 환율로 통화를 변환하며 과거 날짜도 지원합니다.Uses the keyless Frankfurter public API
- 백분율 계산기값의 백분율, 비율 또는 백분율 변화를 계산합니다.Calculates offline in your browser
- 계산기키보드를 지원하는 기본 산술 계산기입니다.Calculates offline in your browser
- 나이 및 날짜 계산기나이와 날짜 간 일수를 계산하고 달력 날짜를 더하거나 뺍니다.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
- 플래시카드 만들기비공개 플래시카드 묶음을 만들고 로컬에서 복습, 섞기, 숙련도를 추적합니다.Saved only in your browser
- 스톱워치 및 타이머랩 기능이 있는 스톱워치 또는 시각적 카운트다운 타이머를 사용합니다.Runs locally in your browser
- 간단 메모비공개 메모를 작성하고 자동 저장한 뒤 텍스트 파일로 내보냅니다.Saved only in your browser
- 무료 번역기기기 내장 번역기 또는 무료 MyMemory API로 텍스트를 번역합니다.On-device first; keyless MyMemory fallback
- 대본 번역기가능한 경우 로컬에서, 또는 키가 필요 없는 무료 API로 대본을 나란히 번역합니다.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.공개 출처에서 결과를 가져오려면 Verfiai 무료 로그인이 필요합니다.
- 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.