# Tentaco — llms.txt
# Curated index for AI crawlers and assistants
# https://tentaco.cc

> Tentaco is a privacy-first browser toolbox: 25 live studios, 574+ tools, local processing by default.
> Available in 17 languages (en, de, es, fr, it, nl, pl, pt, ru, tr, cs, hi, ja, zh, ko, uk, id).
> [Sitemap](/sitemap.xml) (917 URLs)

## All studios (25) — canonical SEO landings where available
- [pdf-workspace](https://tentaco.cc/use/pdf-merge)
- [image-studio](https://tentaco.cc/use/image-compressor)
- [paint-studio](https://tentaco.cc/use/paint-studio)
- [video-workspace](https://tentaco.cc/use/video-workspace)
- [html-studio](https://tentaco.cc/use/html-minifier)
- [json-workbench](https://tentaco.cc/use/json-formatter)
- [text-hub](https://tentaco.cc/use/word-counter)
- [audio-workspace](https://tentaco.cc/use/bpm-detector)
- [data-studio](https://tentaco.cc/use/json-flatten)
- [spreadsheet-studio](https://tentaco.cc/use/spreadsheet-studio)
- [file-studio](https://tentaco.cc/studios/file-studio)
- [design-studio](https://tentaco.cc/studios/design-studio)
- [web-seo-studio](https://tentaco.cc/studios/web-seo-studio)
- [seo-analytics-studio](https://tentaco.cc/use/seo-analytics-studio)
- [security-studio](https://tentaco.cc/use/password-generator)
- [share-safe-studio](https://tentaco.cc/use/share-safe-studio)
- [calculator-studio](https://tentaco.cc/studios/calculator-studio)
- [api-studio](https://tentaco.cc/studios/api-studio)
- [converter-studio](https://tentaco.cc/studios/converter-studio)
- [document-studio](https://tentaco.cc/use/invoice-template)
- [einvoice-studio](https://tentaco.cc/use/e-rechnung)
- [map-geo-studio](https://tentaco.cc/use/geojson-validator)
- [3d-cad-studio](https://tentaco.cc/use/mesh-stats)
- [automation-studio](https://tentaco.cc/use/cron-builder)
- [reality-lab-studio](https://tentaco.cc/use/artificial-universe)

## Top /use/* landings (150)
- [Merge PDF online](https://tentaco.cc/use/pdf-merge)
- [Compress PDF online](https://tentaco.cc/use/pdf-compress)
- [JSON formatter online](https://tentaco.cc/use/json-formatter)
- [Password generator](https://tentaco.cc/use/password-generator)
- [UUID generator online](https://tentaco.cc/use/uuid-generator)
- [Regex tester online](https://tentaco.cc/use/regex-tester)
- [JWT decoder online](https://tentaco.cc/use/jwt-decoder)
- [Base64 encode & decode](https://tentaco.cc/use/base64-encoder)
- [Hash generator (SHA)](https://tentaco.cc/use/hash-generator)
- [Sign PDF online](https://tentaco.cc/use/pdf-sign)
- [pdf-ocr](https://tentaco.cc/use/pdf-ocr)
- [Compress image online](https://tentaco.cc/use/image-compressor)
- [e-rechnung](https://tentaco.cc/use/e-rechnung)
- [XRechnung validator](https://tentaco.cc/use/xrechnung-validator)
- [Free invoice template (PDF)](https://tentaco.cc/use/invoice-template)
- [pdf-tools](https://tentaco.cc/use/pdf-tools)
- [browser-json-tools](https://tentaco.cc/use/browser-json-tools)
- [privacy-tools](https://tentaco.cc/use/privacy-tools)
- [developer-tools](https://tentaco.cc/use/developer-tools)
- [complete-pdf-workflow](https://tentaco.cc/use/complete-pdf-workflow)
- [google-translate-alternative](https://tentaco.cc/use/google-translate-alternative)
- [chatgpt-alternative](https://tentaco.cc/use/chatgpt-alternative)
- [slack-alternative](https://tentaco.cc/use/slack-alternative)
- [notion-ai-alternative](https://tentaco.cc/use/notion-ai-alternative)
- [base64](https://tentaco.cc/use/base64)
- [regex](https://tentaco.cc/use/regex)
- [utf-8](https://tentaco.cc/use/utf-8)
- [cors](https://tentaco.cc/use/cors)
- [schema-validation-guide](https://tentaco.cc/use/schema-validation-guide)
- [developer-api-testing](https://tentaco.cc/use/developer-api-testing)
- [PDF Lock online](https://tentaco.cc/use/pdf-lock)
- [PDF Unlock online](https://tentaco.cc/use/pdf-unlock)
- [SVG to PNG online](https://tentaco.cc/use/svg-to-png)
- [JSON to TypeScript online](https://tentaco.cc/use/json-to-typescript)
- [CORS Tester online](https://tentaco.cc/use/cors-tester)
- [Timestamp converter online](https://tentaco.cc/use/timestamp-converter)
- [Percentage Calculator online](https://tentaco.cc/use/percentage-calculator)
- [Extract Audio from Video online](https://tentaco.cc/use/video-extract-audio)
- [hash-generators](https://tentaco.cc/use/hash-generators)
- [online-calculators-free](https://tentaco.cc/use/online-calculators-free)
- [image-tools](https://tentaco.cc/use/image-tools)
- [schema-tools](https://tentaco.cc/use/schema-tools)
- [e-invoice-full-workflow](https://tentaco.cc/use/e-invoice-full-workflow)
- [image-optimize-web](https://tentaco.cc/use/image-optimize-web)
- [password-security-audit](https://tentaco.cc/use/password-security-audit)
- [regex-testing-guide](https://tentaco.cc/use/regex-testing-guide)
- [legal-impressum-de](https://tentaco.cc/use/legal-impressum-de)
- [social-media-kit](https://tentaco.cc/use/social-media-kit)
- [video-compress-social](https://tentaco.cc/use/video-compress-social)
- [3D online](https://tentaco.cc/use/3d-cad-studio)
- [Accounting Export online](https://tentaco.cc/use/accounting-export)
- [Add Line Breaks online](https://tentaco.cc/use/add-line-breaks)
- [Add Prefix online](https://tentaco.cc/use/add-prefix-suffix)
- [XR World Builder online](https://tentaco.cc/use/aframe-reality-builder)
- [Age Calculator online](https://tentaco.cc/use/age-calculator)
- [Alchemy Lab online](https://tentaco.cc/use/alchemy-lab)
- [Alternating Case online](https://tentaco.cc/use/alternating-case)
- [Anchor Link Generator online](https://tentaco.cc/use/anchor-link-generator)
- [Animation Inspector online](https://tentaco.cc/use/animation-inspector)
- [API Key Generator online](https://tentaco.cc/use/api-key-generator)
- [API Studio online](https://tentaco.cc/use/api-studio)
- [Application Template online](https://tentaco.cc/use/application-template)
- [Artificial Universe online](https://tentaco.cc/use/artificial-universe)
- [ASCII Art online](https://tentaco.cc/use/ascii-art)
- [Aspect Fit online](https://tentaco.cc/use/aspect-fit-calculator)
- [Aspect Ratio Calculator online](https://tentaco.cc/use/aspect-ratio)
- [Simplify Aspect Ratio online](https://tentaco.cc/use/aspect-ratio-simplify)
- [Atbash Cipher online](https://tentaco.cc/use/atbash-cipher)
- [Audio Studio online](https://tentaco.cc/use/audio-workspace)
- [Automation Studio online](https://tentaco.cc/use/automation-studio)
- [Body Puppet online](https://tentaco.cc/use/avatar-puppet)
- [Axe Accessibility Audit online](https://tentaco.cc/use/axe-audit)
- [Bacon Cipher online](https://tentaco.cc/use/bacon-cipher)
- [Download Time online](https://tentaco.cc/use/bandwidth-calculator)
- [Base32 Encoder online](https://tentaco.cc/use/base32-encoder)
- [Base58 Encoder](https://tentaco.cc/use/base58-encoder)
- [Base64 File Encoder online](https://tentaco.cc/use/base64-file)
- [Base64 Image Preview online](https://tentaco.cc/use/base64-image-preview)
- [Base64 URL Encode online](https://tentaco.cc/use/base64-url-encode)
- [Bcrypt Hash](https://tentaco.cc/use/bcrypt-hash)
- [BeepBox Reactor online](https://tentaco.cc/use/beepbox-reactor)
- [Before/After Slider online](https://tentaco.cc/use/before-after-slider)
- [Binary ↔ Text Converter online](https://tentaco.cc/use/binary-text)
- [Binary to Text online](https://tentaco.cc/use/binary-to-text)
- [BMI Calculator online](https://tentaco.cc/use/bmi-calculator)
- [BMR Calculator online](https://tentaco.cc/use/bmr-calculator)
- [Border Radius Generator online](https://tentaco.cc/use/border-radius-generator)
- [CSS Box Shadow Generator online](https://tentaco.cc/use/box-shadow-generator)
- [BPM Detector online](https://tentaco.cc/use/bpm-detector)
- [Break-Even Calculator online](https://tentaco.cc/use/break-even)
- [Breakpoint Editor online](https://tentaco.cc/use/breakpoint-editor)
- [Bubble Text online](https://tentaco.cc/use/bubble-text)
- [Burn Subtitles online](https://tentaco.cc/use/burn-subtitles)
- [Bytes Unit Converter online](https://tentaco.cc/use/bytes-converter)
- [Caesar Brute Force online](https://tentaco.cc/use/caesar-bruteforce)
- [Caesar Cipher / ROT13 online](https://tentaco.cc/use/caesar-cipher)
- [Calculator Studio online](https://tentaco.cc/use/calculator-studio)
- [Cancellation Template online](https://tentaco.cc/use/cancellation-template)
- [Case Converter online](https://tentaco.cc/use/case-converter)
- [Certificate Inspector online](https://tentaco.cc/use/certificate-inspector)
- [Character Statistics online](https://tentaco.cc/use/char-type-stats)
- [chmod Calculator online](https://tentaco.cc/use/chmod-calculator)
- [Clamp Generator online](https://tentaco.cc/use/clamp-generator)
- [CMYK to RGB online](https://tentaco.cc/use/cmyk-to-rgb)
- [Coin Flip online](https://tentaco.cc/use/coin-flip)
- [Collapse Whitespace online](https://tentaco.cc/use/collapse-whitespace)
- [Collision Preview online](https://tentaco.cc/use/collision-preview)
- [color-tools](https://tentaco.cc/use/color-tools)
- [Color Contrast Checker online](https://tentaco.cc/use/color-contrast)
- [Color converter online](https://tentaco.cc/use/color-converter)
- [Color Mixer online](https://tentaco.cc/use/color-mixer)
- [Color Palette from Image online](https://tentaco.cc/use/color-palette-from-image)
- [Color Shades Generator online](https://tentaco.cc/use/color-shades)
- [Combinations nCr online](https://tentaco.cc/use/combinations)
- [Complaint Letter online](https://tentaco.cc/use/complaint-template)
- [Compound Interest Calculator online](https://tentaco.cc/use/compound-interest)
- [Contact Sheet online](https://tentaco.cc/use/contact-sheet)
- [Converter Studio online](https://tentaco.cc/use/converter-studio)
- [Cookie Inspector online](https://tentaco.cc/use/cookie-inspector)
- [Cookie Policy Generator online](https://tentaco.cc/use/cookie-policy-generator)
- [Count Lines online](https://tentaco.cc/use/count-lines)
- [Count Occurrences online](https://tentaco.cc/use/count-occurrences)
- [CRC32 Calculator online](https://tentaco.cc/use/crc32-calculator)
- [Credit Card Mask online](https://tentaco.cc/use/credit-card-mask)
- [Credit Card Validator online](https://tentaco.cc/use/credit-card-validator)
- [Cron Builder online](https://tentaco.cc/use/cron-builder)
- [Cron expression generator online](https://tentaco.cc/use/cron-explainer)
- [Cron Expression Builder online](https://tentaco.cc/use/cron-expression-builder)
- [Cron Parser online](https://tentaco.cc/use/cron-parser)
- [Cron Validator online](https://tentaco.cc/use/cron-validator)
- [CSP Decoder online](https://tentaco.cc/use/csp-decoder)
- [CSP Generator online](https://tentaco.cc/use/csp-generator)
- [CSS Grid Builder online](https://tentaco.cc/use/css-grid-builder)
- [CSS Minifier online](https://tentaco.cc/use/css-minifier)
- [CSS Variables online](https://tentaco.cc/use/css-variables)
- [CSV to Invoice online](https://tentaco.cc/use/csv-to-invoice)
- [CSV to JSON converter online](https://tentaco.cc/use/csv-to-json)
- [CSV to Lines online](https://tentaco.cc/use/csv-to-lines)
- [cURL Command Generator online](https://tentaco.cc/use/curl-converter)
- [Data Rate Converter online](https://tentaco.cc/use/data-rate-converter)
- [Data Studio online](https://tentaco.cc/use/data-studio)
- [Add Days to Date online](https://tentaco.cc/use/date-add)
- [Date Difference Calculator online](https://tentaco.cc/use/date-difference)
- [Datenschutz Generator online](https://tentaco.cc/use/datenschutz-generator)
- [Days Until Date online](https://tentaco.cc/use/days-until)
- [Delivery Note online](https://tentaco.cc/use/delivery-note-template)
- [Design Studio online](https://tentaco.cc/use/design-studio)
- [Design Tokens online](https://tentaco.cc/use/design-tokens)
- [Device Forge online](https://tentaco.cc/use/device-forge)
- [Dice Roller online](https://tentaco.cc/use/dice-roller)

## Guides (all)
- [How to merge PDF files — free guide](https://tentaco.cc/guides/pdf-zusammenfuegen)
- [How to compress PDF — reduce file size](https://tentaco.cc/guides/pdf-komprimieren)
- [How to format JSON online](https://tentaco.cc/guides/json-formatieren)
- [How to create XRechnung — DE guide](https://tentaco.cc/guides/xrechnung-erstellen)
- [Job application PDF — tips (DE)](https://tentaco.cc/guides/bewerbung-pdf)
- [JWT decode workflow — inspect tokens safely](https://tentaco.cc/guides/jwt-decode-workflow)
- [How to build a cron schedule — readable expressions](https://tentaco.cc/guides/cron-schedule-setup)
- [How to validate GeoJSON — feature and geometry checks](https://tentaco.cc/guides/geojson-validate-workflow)
- [How to parse email headers — trace routing and SPF](https://tentaco.cc/guides/email-header-parse)
- [How to validate JSON-LD schema markup](https://tentaco.cc/guides/schema-json-ld-validate)
- [How to generate hreflang alternate tags](https://tentaco.cc/guides/hreflang-alternate-tags)
- [How to build UTM links for social campaigns](https://tentaco.cc/guides/social-utm-campaign)
- [How to flatten nested JSON for databases](https://tentaco.cc/guides/database-json-flatten)
- [How to generate a .gitignore for your stack](https://tentaco.cc/guides/automation-gitignore)
- [How to sign a PDF — free guide](https://tentaco.cc/guides/pdf-signieren)
- [How to OCR a scanned PDF](https://tentaco.cc/guides/ocr-scannen)
- [How to add a PDF watermark](https://tentaco.cc/guides/wasserzeichen-pdf)
- [How to detect BPM from audio](https://tentaco.cc/guides/bpm-erkennen)
- [How to create an Impressum (Germany)](https://tentaco.cc/guides/impressum-erstellen)
- [How to use a Pomodoro timer](https://tentaco.cc/guides/pomodoro-timer)
- [Complete PDF workflow — scan to signed export](https://tentaco.cc/guides/complete-pdf-workflow)
- [How to optimize images for the web](https://tentaco.cc/guides/image-optimize-web)
- [Developer API testing workflow — curl, CORS and OpenAPI](https://tentaco.cc/guides/developer-api-testing)
- [German Impressum setup — legal notice workflow](https://tentaco.cc/guides/legal-impressum-de)
- [Social media kit workflow — sizes, UTM and OG images](https://tentaco.cc/guides/social-media-kit)
- [Database export pipeline — JSON flatten and CSV prep](https://tentaco.cc/guides/database-export-pipeline)
- [Music BPM workflow — detect tempo and key](https://tentaco.cc/guides/music-bpm-workflow)
- [3D mesh inspect workflow — STL/OBJ before printing](https://tentaco.cc/guides/3d-mesh-inspect)
- [Education math tools workflow — calculators and quizzes](https://tentaco.cc/guides/education-math-tools)
- [Video compress for social — size limits and formats](https://tentaco.cc/guides/video-compress-social)
- [E-invoice full workflow — EN 16931 to XRechnung submit](https://tentaco.cc/guides/e-invoice-full-workflow)
- [Password security audit — generate, test and hash](https://tentaco.cc/guides/password-security-audit)
- [Subtitle burn-in workflow — SRT validate to video](https://tentaco.cc/guides/subtitle-burn-workflow)
- [Regex testing guide — patterns before production](https://tentaco.cc/guides/regex-testing-guide)
- [Schema validation guide — JSON Schema and OpenAPI](https://tentaco.cc/guides/schema-validation-guide)

## Glossary (all)
- [XRechnung](https://tentaco.cc/glossary/xrechnung)
- [ZUGFeRD](https://tentaco.cc/glossary/zugferd)
- [JWT](https://tentaco.cc/glossary/jwt)
- [Leitweg-ID](https://tentaco.cc/glossary/leitweg-id)
- [Factur-X](https://tentaco.cc/glossary/factur-x)
- [Schematron](https://tentaco.cc/glossary/schematron)
- [UUID](https://tentaco.cc/glossary/uuid)
- [bcrypt](https://tentaco.cc/glossary/bcrypt)
- [nanoid](https://tentaco.cc/glossary/nanoid)
- [UTM parameters](https://tentaco.cc/glossary/utm-parameters)
- [PDF/A](https://tentaco.cc/glossary/pdf-a)
- [SVG](https://tentaco.cc/glossary/svg)
- [STL mesh](https://tentaco.cc/glossary/stl-mesh)
- [Vigenère cipher](https://tentaco.cc/glossary/vigenere-cipher)
- [Levenshtein distance](https://tentaco.cc/glossary/levenshtein-distance)
- [readability score](https://tentaco.cc/glossary/readability-score)
- [inflation calculator](https://tentaco.cc/glossary/inflation-calculator)
- [JSON-LD](https://tentaco.cc/glossary/json-ld)
- [BPM](https://tentaco.cc/glossary/bpm)
- [OCR](https://tentaco.cc/glossary/ocr)
- [GeoJSON](https://tentaco.cc/glossary/geojson)
- [Pomodoro](https://tentaco.cc/glossary/pomodoro)
- [Watermark](https://tentaco.cc/glossary/watermark)
- [SRT subtitles](https://tentaco.cc/glossary/srt-subtitles)
- [Impressum](https://tentaco.cc/glossary/impressum)
- [Cron expression](https://tentaco.cc/glossary/cron-expression)
- [Levenshtein distance](https://tentaco.cc/glossary/levenshtein)
- [Base64](https://tentaco.cc/glossary/base64)
- [hashing](https://tentaco.cc/glossary/hashing)
- [MIME type](https://tentaco.cc/glossary/mime-type)
- [regex](https://tentaco.cc/glossary/regex)
- [UTF-8](https://tentaco.cc/glossary/utf-8)
- [CSV format](https://tentaco.cc/glossary/csv-format)
- [YAML](https://tentaco.cc/glossary/yaml)
- [TOML](https://tentaco.cc/glossary/toml)
- [Markdown](https://tentaco.cc/glossary/markdown)
- [hex color](https://tentaco.cc/glossary/hex-color)
- [Flexbox](https://tentaco.cc/glossary/flexbox)
- [viewport](https://tentaco.cc/glossary/viewport)
- [canonical URL](https://tentaco.cc/glossary/canonical-url)
- [hreflang tag](https://tentaco.cc/glossary/hreflang-tag)
- [XML sitemap](https://tentaco.cc/glossary/xml-sitemap)
- [Core Web Vitals](https://tentaco.cc/glossary/core-web-vitals)
- [LCP](https://tentaco.cc/glossary/lcp-metric)
- [Tesseract OCR](https://tentaco.cc/glossary/tesseract-ocr)
- [PDF/A-3](https://tentaco.cc/glossary/pdf-a-3)
- [EN 16931](https://tentaco.cc/glossary/en-16931)
- [AES encryption](https://tentaco.cc/glossary/aes-encryption)
- [CORS](https://tentaco.cc/glossary/cors)
- [OpenAPI](https://tentaco.cc/glossary/openapi)
- [.gitignore](https://tentaco.cc/glossary/gitignore)
- [SemVer](https://tentaco.cc/glossary/semver)

## Compare articles (index)
- [Compare index](https://tentaco.cc/compare)
- [iLovePDF alternative — free PDF tools without upload](https://tentaco.cc/compare/ilovepdf-alternative)
- [Adobe Acrobat online alternative — free browser PDF tools](https://tentaco.cc/compare/adobe-acrobat-alternative)
- [Smallpdf alternative — privacy-friendly PDF in the browser](https://tentaco.cc/compare/smallpdf-alternative)
- [PDF24 alternative — free PDF tools in the browser](https://tentaco.cc/compare/pdf24-alternative)
- [Sejda alternative — privacy-friendly PDF online](https://tentaco.cc/compare/sejda-alternative)
- [remove.bg alternative — background removal in browser](https://tentaco.cc/compare/removebg-alternative)
- [TinyPNG alternative — compress images without upload](https://tentaco.cc/compare/tinypng-alternative)
- [Canva PDF tools alternative — merge & compress free](https://tentaco.cc/compare/canva-pdf-alternative)
- [Notion utilities alternative — dev & PDF tools free](https://tentaco.cc/compare/notion-alternative)
- [PDFescape alternative — edit PDFs in browser free](https://tentaco.cc/compare/pdfescape-alternative)
- [JSONLint alternative — validate JSON in browser](https://tentaco.cc/compare/jsonlint-alternative)
- [jwt.io alternative — decode JWT locally](https://tentaco.cc/compare/jwt-io-alternative)
- [regex101 alternative — test regex locally](https://tentaco.cc/compare/regex101-alternative)
- [DocuSign alternative — sign PDF in browser](https://tentaco.cc/compare/docusign-alternative)
- [XRechnung software alternative — validate free in browser](https://tentaco.cc/compare/xrechnung-software-alternative)
- [DATEV export helper — free browser tools](https://tentaco.cc/compare/datev-alternative)
- [DeepL alternative — honest limits for browser tools](https://tentaco.cc/compare/deepl-alternative)
- [Canva alternative — PDF & image tools without account](https://tentaco.cc/compare/canva-alternative)
- [Photopea alternative — lightweight image tools local](https://tentaco.cc/compare/photopea-alternative)
- [Grammarly alternative — local text tools honest comparison](https://tentaco.cc/compare/grammarly-alternative)
… and 44 more compare articles

## Policies
- [Mission](https://tentaco.cc/mission)
- [Features](https://tentaco.cc/features)
- [Changelog](https://tentaco.cc/changelog)
- [Roadmap](https://tentaco.cc/roadmap)
- [Privacy](https://tentaco.cc/privacy)