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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 Checker登录 Verfiai 后免费：检查参考文献的元数据、撤稿通知和引用风险。从公开来源获取结果需要免费登录 Verfiai。
- 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 期刊核查器查看期刊或文章是否收录于开放获取期刊目录。Queries the public DOAJ API from your browser
- Semantic Scholar 学术搜索查找学术论文和作者，以及引用、年份、出版平台和开放获取链接。Queries the public Semantic Scholar API from your browser
- OpenCitations DOI 探索器使用 OpenCitations 探索 DOI 的被引记录和参考文献。Queries the public OpenCitations API from your browser
- 数据集与 DOI 查找器搜索 Zenodo 数据集，并通过 DataCite 查询 DOI 元数据。Queries public Zenodo and DataCite APIs from your browser
- 英语词典查找英语释义、词性、同义词、反义词和发音。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.从公开来源获取结果需要免费登录 Verfiai。
- 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 检查器检查公开的 A、AAAA、MX、TXT、NS、CNAME 和 SOA DNS 记录。Queries Cloudflare DNS-over-HTTPS from your browser
- 证书探索器查看公开 TLS 证书历史、颁发者、日期和发现的子域名。Queries the public crt.sh certificate database
- 电话号码验证器在本地解析并验证电话号码，查看国家、类型和 E.164 格式。Validates locally; no network request
- IP 地址检查器查看你的公网 IP，或查询 IP 地址、位置、机构和 ASN。Uses the keyless ipwho.is public API
- 视频研究指南实用指南：研究视频转录文本、核实引述并查找原始来源。Static guide
- 如何核查解答有关核查照片、来源、引述和网络说法的常见问题。Static guide
- 免费研究模板与核查指南下载用于主张、证据、引文和合规的清单与记录表。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
- 单位换算器离线换算长度、重量、温度、速度、面积、体积和数据大小。Calculates offline in your browser
- 货币换算器使用免费的 Frankfurter 公共汇率换算货币，支持历史日期。Uses the keyless Frankfurter public API
- 百分比计算器计算数值的百分比、百分比占比或百分比变化。Calculates offline in your browser
- 计算器支持键盘操作的基础算术计算器。Calculates offline in your browser
- 年龄与日期计算器计算年龄、两个日期之间的天数，或增减日历天数。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
- 闪卡制作工具创建私密闪卡组，在本地复习、随机排序并追踪已掌握的卡片。Saved only in your browser
- 秒表与计时器使用带分段计时的秒表或可视倒计时器。Runs locally in your browser
- 随手笔记撰写私密笔记，自动保存并导出为文本文件。Saved only in your browser
- 免费翻译器使用设备内置翻译器或免费的 MyMemory API 翻译文本。On-device first; keyless MyMemory fallback
- 字幕翻译器可用时在本地翻译字幕，也可通过免费的免密钥 API 并排翻译。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.从公开来源获取结果需要免费登录 Verfiai。
- 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.