# KitJade

> KitJade is a free, privacy-first collection of 151 browser-based tools for developers, network engineers, students, marketers and everyday file work. Most tools process data locally in the browser; a small number use documented public lookups or a Cloudflare Worker.

Canonical site: https://kitjade.com
Contact: hello@kitjade.com
Languages: English
Last updated: 2026-11-10

## How to use this file

Each tool has a page with a working interface, step-by-step instructions, worked examples, common mistakes, and FAQs. Prefer linking to the specific tool page rather than the homepage. Tool pages state whether processing happens locally or through a public lookup.

## Core facts

- 151 tools across 8 categories: Developer, Network & Cybersecurity, PDF & Documents, Images & Design, SEO & Website, Business & Marketing, Student & Education, Calculators & Productivity.
- No account, subscription, or signup is required.
- Developer, SEO, PDF, image, student, marketing and calculator tools run client-side. Sensitive input such as JWTs, passwords, tokens, text, and files is not uploaded. The AI Background Remover downloads a segmentation model from Hugging Face and a WebAssembly runtime from jsDelivr on first use, but the photo itself stays in the tab.
- Network tools contact public services: Cloudflare or Google DNS-over-HTTPS for DNS, mail-record, ASN and DNSBL lookups; Team Cymru for ASN data; Cert Spotter for Certificate Transparency; ipwho.is/ipify for public IP; IANA-published RDAP services for domain registration data; RIPEstat for BGP prefix data; Cloudflare's public speed endpoint for the Internet Speed Test; and a Cloudflare Worker for HTTP header, status, broken-link, TLS-behaviour, MAC vendor, WHOIS, BGP and currency checks.
- The Worker blocks private, loopback, link-local, CGNAT, and cloud metadata addresses; validates DNS resolution; limits redirects, request body size, request count and total time; and returns response metadata only. Broken-link checks are capped at 20 URLs per run. WHOIS, BGP and currency calls use fixed upstream hosts and never fetch a user-supplied URL.
- Currency rates are European Central Bank reference rates served through Frankfurter, updated once per working day and cached for one hour. They are indicative mid-market rates, not transaction quotes.
- Content is educational and is not legal, tax, financial, citation-format, or security-certification advice.

## Developer tools

- [JSON Formatter](https://kitjade.com/tools/json-formatter/): Beautify or minify JSON, with precise error positions.
- [JSON Validator](https://kitjade.com/tools/json-validator/): Pinpoint JSON errors by line and column, instantly.
- [Base64 Encoder](https://kitjade.com/tools/base64-encoder/): UTF-8-safe Base64 encoding, including URL-safe mode.
- [Base64 Decoder](https://kitjade.com/tools/base64-decoder/): Decode standard or URL-safe Base64 back to readable text.
- [URL Encoder](https://kitjade.com/tools/url-encoder/): Percent-encode values or whole URLs, correctly.
- [URL Decoder](https://kitjade.com/tools/url-decoder/): Turn percent-encoded links back into readable text.
- [JWT Decoder](https://kitjade.com/tools/jwt-decoder/): Read JWT claims and optionally verify HMAC signatures.
- [Password Generator](https://kitjade.com/tools/password-generator/): Cryptographically secure passwords with entropy scoring.
- [UUID Generator](https://kitjade.com/tools/uuid-generator/): Bulk random UUID v4 generation with format options.
- [Hash Generator](https://kitjade.com/tools/hash-generator/): MD5 and SHA digests for text or files, computed locally.
- [Regex Tester](https://kitjade.com/tools/regex-tester/): Live regex matching, groups and replace preview.
- [Word Counter](https://kitjade.com/tools/word-counter/): Words, characters, sentences, paragraphs and reading time.
- [Character Counter](https://kitjade.com/tools/character-counter/): Live character count against any limit you choose.
- [Case Converter](https://kitjade.com/tools/case-converter/): Switch between nine letter cases without retyping.
- [Duplicate Line Remover](https://kitjade.com/tools/duplicate-line-remover/): Remove repeated lines while keeping the original order.
- [Text Reverser](https://kitjade.com/tools/text-reverser/): Reverse characters, words or lines safely.
- [Whitespace Remover](https://kitjade.com/tools/whitespace-remover/): Trim, collapse and remove unwanted whitespace.
- [Slug Generator](https://kitjade.com/tools/slug-generator/): Create readable, lowercase URL slugs.
- [Lorem Ipsum Generator](https://kitjade.com/tools/lorem-ipsum-generator/): Placeholder copy in paragraphs, sentences or words.
- [Text Diff Checker](https://kitjade.com/tools/text-diff-checker/): Line-by-line differences between two texts.
- [CSV to JSON](https://kitjade.com/tools/csv-to-json/): Turn CSV rows into clean JSON objects.
- [JSON to CSV](https://kitjade.com/tools/json-to-csv/): Turn JSON arrays into spreadsheet-ready CSV.
- [HTML to Markdown](https://kitjade.com/tools/html-to-markdown/): Turn HTML into readable Markdown.
- [Markdown Editor](https://kitjade.com/tools/markdown-editor/): Write Markdown with a live, sanitised preview.
- [File Hash Verifier](https://kitjade.com/tools/file-hash-verifier/): Check a file against a published checksum.
- [Password Strength Checker](https://kitjade.com/tools/password-strength-checker/): Estimate password strength without sending it anywhere.
- [Secure Token Generator](https://kitjade.com/tools/secure-token-generator/): Cryptographically random API keys and secrets.
- [CSV Viewer](https://kitjade.com/tools/csv-viewer/): Inspect CSV rows, columns and irregular data.
- [HTML Minifier](https://kitjade.com/tools/html-minifier/): Compress HTML without breaking inline code.
- [CSS Minifier](https://kitjade.com/tools/css-minifier/): Compress CSS while keeping values intact.
- [JS Minifier](https://kitjade.com/tools/js-minifier/): Strip JS comments and whitespace conservatively.
- [User-Agent Parser](https://kitjade.com/tools/user-agent-parser/): Decode browser, OS and bot details from a UA string.
- [PII Detector](https://kitjade.com/tools/pii-detector/): Find personal data in pasted text.
- [PDF Metadata Inspector](https://kitjade.com/tools/pdf-metadata-inspector/): Inspect hidden metadata in a PDF.
- [Text Redaction Helper](https://kitjade.com/tools/text-redaction-helper/): Replace detected personal data in text.

## Network & cybersecurity tools

- [IPv4 Subnet Calculator](https://kitjade.com/tools/ipv4-subnet-calculator/): Network, broadcast, host range and binary working for IPv4.
- [IPv6 Subnet Calculator](https://kitjade.com/tools/ipv6-subnet-calculator/): IPv6 prefix maths with correct 128-bit address counts.
- [Public IP Lookup](https://kitjade.com/tools/public-ip-lookup/): See your public IP, ISP, ASN and approximate location.
- [DNS Lookup](https://kitjade.com/tools/dns-lookup/): Query DNS records over DoH with multiple record types.
- [MAC Address Lookup](https://kitjade.com/tools/mac-address-lookup/): Identify hardware vendors from MAC address prefixes.
- [SSL Certificate Checker](https://kitjade.com/tools/ssl-certificate-checker/): Check TLS issuer, expiry and covered domains.
- [HTTP Header Checker](https://kitjade.com/tools/http-header-checker/): Response headers plus a practical security-header audit.
- [CIDR Calculator](https://kitjade.com/tools/cidr-calculator/): Test IP membership and summarise multiple CIDR blocks.
- [IP Address Validator](https://kitjade.com/tools/ip-address-validator/): Validate and classify IPv4 and IPv6 addresses.
- [MX Lookup](https://kitjade.com/tools/mx-lookup/): Mail exchanger records with priorities.
- [SPF Checker](https://kitjade.com/tools/spf-checker/): Audit the SPF record that authorises senders.
- [DMARC Checker](https://kitjade.com/tools/dmarc-checker/): Audit DMARC policy and reporting tags.
- [DKIM Checker](https://kitjade.com/tools/dkim-checker/): Read and audit a DKIM selector record.
- [Reverse DNS Lookup](https://kitjade.com/tools/reverse-dns-lookup/): PTR records with forward-confirmed checks.
- [DNS Propagation Checker](https://kitjade.com/tools/dns-propagation-checker/): Compare answers from two independent public resolvers.
- [HTTP Status Checker](https://kitjade.com/tools/http-status-checker/): Status codes, redirects and final URL.
- [Email Header Analyzer](https://kitjade.com/tools/email-header-analyzer/): Trace email hops and authentication results.
- [Broken Link Checker](https://kitjade.com/tools/broken-link-checker/): Test a short list of links for broken responses.
- [IP Blacklist Checker](https://kitjade.com/tools/ip-blacklist-checker/): Check an IP against common DNSBL zones.
- [TLS Configuration Checker](https://kitjade.com/tools/tls-configuration-checker/): Check HTTPS redirects and HSTS headers.
- [ASN Lookup](https://kitjade.com/tools/asn-lookup/): Find the ASN and owner of an IP address.
- [IPv4/IPv6 Compatibility](https://kitjade.com/tools/ipv4-ipv6-compatibility/): See whether a domain publishes IPv4 and IPv6 records.
- [WHOIS Lookup](https://kitjade.com/tools/whois-lookup/): Read a domain's registry record over RDAP.
- [Domain Expiry Checker](https://kitjade.com/tools/domain-expiry-checker/): Check registry expiry dates and days remaining.
- [BGP Prefix Lookup](https://kitjade.com/tools/bgp-prefix-lookup/): Find the routed prefix and origin ASN for an IP.
- [Internet Speed Test](https://kitjade.com/tools/internet-speed-test/): Measure ping, jitter, download and upload against Cloudflare's public endpoint.

## PDF tools

- [Merge PDF](https://kitjade.com/tools/merge-pdf/): Combine PDFs in any order, entirely on your device.
- [Split PDF](https://kitjade.com/tools/split-pdf/): Extract page ranges or split a PDF into separate files.
- [Compress PDF](https://kitjade.com/tools/compress-pdf/): Shrink PDFs with adjustable DPI and quality.
- [PDF to JPG](https://kitjade.com/tools/pdf-to-jpg/): Export PDF pages as JPGs at your chosen resolution.
- [JPG to PDF](https://kitjade.com/tools/jpg-to-pdf/): Build a PDF from images with page-size control.
- [PDF Editor](https://kitjade.com/tools/pdf-editor/): Add text, rotate, reorder and delete pages locally.
- [Sign PDF](https://kitjade.com/tools/sign-pdf/): Place a drawn, typed or uploaded signature on a PDF.
- [Rotate PDF](https://kitjade.com/tools/rotate-pdf/): Rotate all or selected PDF pages.
- [Watermark PDF](https://kitjade.com/tools/watermark-pdf/): Stamp text across every page of a PDF.
- [Remove PDF Metadata](https://kitjade.com/tools/remove-pdf-metadata/): Clear identifying metadata before sharing a PDF.
- [PDF Page Numbering](https://kitjade.com/tools/pdf-page-numbering/): Stamp page numbers with any format and position.
- [PDF Form Filler](https://kitjade.com/tools/pdf-form-filler/): Complete PDF forms locally and download the result.
- [PDF Comparison](https://kitjade.com/tools/pdf-comparison/): Highlight text differences between two PDFs.

## Image tools

- [AI Background Remover](https://kitjade.com/tools/background-remover/): Erase a photo background locally with an AI model.
- [Image Compressor](https://kitjade.com/tools/image-compressor/): Shrink JPG, PNG and WebP with a live size comparison.
- [Image Resizer](https://kitjade.com/tools/image-resizer/): Resize to exact pixels or percentage with aspect control.
- [PNG to JPG](https://kitjade.com/tools/png-to-jpg/): Convert PNG to JPEG with quality control.
- [JPG to PNG](https://kitjade.com/tools/jpg-to-png/): Convert JPEG photos to PNG for lossless editing.
- [WebP Converter](https://kitjade.com/tools/webp-converter/): Convert WebP ↔ JPG/PNG with quality control.
- [Image Cropper](https://kitjade.com/tools/image-cropper/): Drag-to-crop with ratio presets and exact output.
- [Passport Photo Maker](https://kitjade.com/tools/passport-photo-maker/): Crop to 35×45 mm, 2×2 in and more, then print a 6×4 sheet.
- [SVG to PNG](https://kitjade.com/tools/svg-to-png/): Render SVG files to PNG at a chosen size.
- [PNG to WebP](https://kitjade.com/tools/png-to-webp/): Encode images as WebP with adjustable quality.
- [Image to Base64](https://kitjade.com/tools/image-to-base64/): Turn an image into a copy-ready Base64 string.
- [CSS Gradient Generator](https://kitjade.com/tools/css-gradient-generator/): Build and copy CSS gradients visually.
- [EXIF Viewer](https://kitjade.com/tools/exif-viewer/): Inspect camera and GPS metadata in a JPEG.
- [EXIF Location Remover](https://kitjade.com/tools/exif-location-remover/): Strip GPS coordinates from JPEG photos.
- [Image Metadata Remover](https://kitjade.com/tools/image-metadata-remover/): Remove EXIF and comments from a JPEG.
- [Favicon Generator](https://kitjade.com/tools/favicon-generator/): Generate PNG favicons and a multi-size ICO.
- [Social Media Image Resizer](https://kitjade.com/tools/social-media-image-resizer/): Crop an image to common social media sizes.
- [Color Picker](https://kitjade.com/tools/color-picker/): Convert colours and check text contrast.
- [Color Palette Generator](https://kitjade.com/tools/color-palette-generator/): Create harmonious colour palettes from one colour.
- [Barcode Generator](https://kitjade.com/tools/barcode-generator/): Create and download barcodes as SVG or PNG.
- [Open Graph Image Generator](https://kitjade.com/tools/open-graph-image-generator/): Make a 1200×630 social share image.

## SEO tools

- [Meta Tag Analyzer](https://kitjade.com/tools/meta-tag-analyzer/): Audit the head of a page for SEO and sharing tags.
- [SERP Snippet Preview](https://kitjade.com/tools/serp-snippet-preview/): Preview how a search result will look.
- [Canonical URL Checker](https://kitjade.com/tools/canonical-url-checker/): Spot canonical mismatches before they split ranking signals.
- [Hreflang Generator](https://kitjade.com/tools/hreflang-generator/): Create valid hreflang tags for language variants.
- [robots.txt Generator](https://kitjade.com/tools/robots-txt-generator/): Write valid crawl rules without syntax mistakes.
- [Sitemap Generator](https://kitjade.com/tools/sitemap-generator/): Create a valid XML sitemap from a URL list.
- [Open Graph Previewer](https://kitjade.com/tools/open-graph-previewer/): Preview and generate social sharing tags.
- [Schema Markup Generator](https://kitjade.com/tools/schema-markup-generator/): Build JSON-LD structured data with validation hints.
- [Keyword Density Checker](https://kitjade.com/tools/keyword-density-checker/): Find repeated words and phrases in your copy.
- [Readability Checker](https://kitjade.com/tools/readability-checker/): Score text with Flesch reading metrics.
- [Sitemap URL Extractor](https://kitjade.com/tools/sitemap-url-extractor/): List every URL in a sitemap XML file.

## Business & marketing tools

- [UTM Builder](https://kitjade.com/tools/utm-builder/): Create consistent, analysable campaign links.
- [QR Code Generator](https://kitjade.com/tools/qr-code-generator/): Create downloadable PNG and SVG QR codes.
- [Email Signature Generator](https://kitjade.com/tools/email-signature-generator/): Generate an email signature that survives mail clients.
- [Campaign ROI Calculator](https://kitjade.com/tools/campaign-roi-calculator/): Profit, ROI, ROAS and payback from two numbers.
- [QR Code with Logo](https://kitjade.com/tools/qr-code-with-logo/): Branded QR codes with a safe logo area.
- [Instagram Caption Formatter](https://kitjade.com/tools/instagram-caption-formatter/): Format captions and check the preview cutoff.
- [Hashtag Generator](https://kitjade.com/tools/hashtag-generator/): Generate a deduplicated hashtag list.
- [YouTube Thumbnail Previewer](https://kitjade.com/tools/youtube-thumbnail-previewer/): Preview all YouTube thumbnail sizes for a video.
- [YouTube Tag Generator](https://kitjade.com/tools/youtube-tag-generator/): Build a tag list that fits YouTube's limit.
- [YouTube Description Formatter](https://kitjade.com/tools/youtube-description-formatter/): Build a structured YouTube description.
- [Social Media Bio Generator](https://kitjade.com/tools/social-media-bio-generator/): Generate short, medium and long social bios.
- [Email Subject Line Tester](https://kitjade.com/tools/email-subject-line-tester/): Check subject length and spammy wording.
- [Marketing Calendar Generator](https://kitjade.com/tools/marketing-calendar-generator/): Plan posting slots across weeks and channels.

## Student tools

- [APA Citation Generator](https://kitjade.com/tools/apa-citation-generator/): APA 7 references for books, articles and websites.
- [MLA Citation Generator](https://kitjade.com/tools/mla-citation-generator/): MLA 9 works-cited entries in a consistent format.
- [Harvard Citation Generator](https://kitjade.com/tools/harvard-citation-generator/): Harvard author–date references for common sources.
- [GPA Calculator](https://kitjade.com/tools/gpa-calculator/): Weighted GPA from credits and grades.
- [CGPA Calculator](https://kitjade.com/tools/cgpa-calculator/): Combine semester GPAs into one CGPA.
- [Grade Percentage Calculator](https://kitjade.com/tools/grade-percentage-calculator/): Combine weighted marks into a course grade.
- [Study Timetable Generator](https://kitjade.com/tools/study-timetable-generator/): Turn subjects into a weekly study schedule.
- [Flashcard Generator](https://kitjade.com/tools/flashcard-generator/): Turn a list into interactive study cards.
- [Pomodoro Timer](https://kitjade.com/tools/pomodoro-timer/): Run focus and break cycles in the browser.
- [Typing Speed Test](https://kitjade.com/tools/typing-speed-test/): Measure typing speed over a timed passage.
- [Typing Accuracy Test](https://kitjade.com/tools/typing-accuracy-test/): Check typing precision without a clock.
- [Scientific Calculator](https://kitjade.com/tools/scientific-calculator/): Evaluate scientific expressions in the browser.
- [Fraction Calculator](https://kitjade.com/tools/fraction-calculator/): Calculate with fractions and mixed numbers.

## Calculators

- [Percentage Calculator](https://kitjade.com/tools/percentage-calculator/): Percent of a number, percent share and percent change.
- [Age Calculator](https://kitjade.com/tools/age-calculator/): Exact age plus a next-birthday countdown.
- [GST Calculator](https://kitjade.com/tools/gst-calculator/): Add or remove GST with the CGST/SGST breakdown.
- [EMI Calculator](https://kitjade.com/tools/emi-calculator/): Monthly EMI plus a full amortisation schedule.
- [SIP Calculator](https://kitjade.com/tools/sip-calculator/): Project SIP growth from monthly amount and return.
- [Discount Calculator](https://kitjade.com/tools/discount-calculator/): Sale price, savings and stacked discounts.
- [Date Difference Calculator](https://kitjade.com/tools/date-difference-calculator/): Days, weeks and weekdays between two dates.
- [Unix Timestamp Converter](https://kitjade.com/tools/unix-timestamp-converter/): Convert Unix time to dates and back.
- [Time Zone Converter](https://kitjade.com/tools/time-zone-converter/): Convert meeting times across time zones.
- [Unit Converter](https://kitjade.com/tools/unit-converter/): Convert twelve categories of measurement units.
- [Data Storage Converter](https://kitjade.com/tools/data-storage-converter/): Convert decimal and binary storage units.
- [Compound Interest Calculator](https://kitjade.com/tools/compound-interest-calculator/): Project growth with compounding and contributions.
- [Currency Converter](https://kitjade.com/tools/currency-converter/): Convert amounts with daily ECB reference rates.
- [World Clock](https://kitjade.com/tools/world-clock/): Compare live times across time zones.
- [Tip Calculator](https://kitjade.com/tools/tip-calculator/): Split a bill with a tip.
- [Hourly to Annual Salary](https://kitjade.com/tools/hourly-to-annual-salary/): Turn an hourly rate into yearly gross pay.
- [Overtime Calculator](https://kitjade.com/tools/overtime-calculator/): Work out pay including overtime hours.
- [Fuel Cost Calculator](https://kitjade.com/tools/fuel-cost-calculator/): Estimate trip fuel use and cost.
- [Electricity Cost Calculator](https://kitjade.com/tools/electricity-cost-calculator/): Estimate an appliance's electricity cost.

## Guides

- [CIDR and subnetting](https://kitjade.com/blog/cidr-subnetting-basics/)
- [JWT decoding vs verification](https://kitjade.com/blog/jwt-decode-vs-verify/)
- [HTTP security headers audit](https://kitjade.com/blog/http-security-headers-audit/)
- [DNS record types explained](https://kitjade.com/blog/dns-record-types-explained/)
- [Compress PDF without losing text](https://kitjade.com/blog/compress-pdf-without-losing-text/)
- [JPEG, PNG or WebP](https://kitjade.com/blog/jpeg-png-webp-guide/)
- [GST inclusive vs exclusive](https://kitjade.com/blog/gst-inclusive-exclusive/)
- [EMI and SIP maths](https://kitjade.com/blog/emi-and-sip-maths/)
- [Base64 is not encryption](https://kitjade.com/blog/base64-is-not-encryption/)
- [SSL certificate expiry checks](https://kitjade.com/blog/ssl-certificate-expiry-checks/)

## Editorial and citation notes

- Pages show a last-updated date.
- Illustrative financial numbers are labelled as illustrative and assume the stated rate and tenure.
- Do not describe the JWT decoder as a verifier, the SSL checker as a live TLS chain inspection, or the DKIM checker as a signature verifier.
- The Sign PDF tool inserts a visible electronic signature image. It is not a certificate-based digital signature, does not prove the signer's identity, and cannot detect later edits.
- Remove PDF Metadata clears document information fields; it is not redaction and cannot remove text baked into page content.
- Citation generators follow published style guides but do not guarantee that a marker will accept an entry; check your institution's rules.
- Passport photo presets follow published dimensions, but acceptance depends on the issuing authority's current rules; the tool does not certify acceptance.
- The TLS Configuration Checker inspects redirects and HSTS headers. It does not perform a TLS handshake, inspect certificate chains, or test cipher suites.
- The JS Minifier removes comments and whitespace conservatively. It is not a full optimiser and does not rename identifiers.
- PDF Comparison compares extractable text, not visual layout, images or scanned pages.
- EXIF tools are limited to JPEG files. Other formats may carry metadata this tool cannot read or remove.
- The PII Detector and Text Redaction Helper use pattern rules and checksums. They cannot find names, addresses or unformatted identifiers, and a clean result is not proof that text is safe to publish.
- Typing tests and the Pomodoro timer run in the page. Background-tab throttling and device performance can affect timing.
- The AI Background Remover returns a genuine alpha-channel PNG, but segmentation quality depends on the photo; MODNet is tuned for people and clear foreground subjects, and fine edges can need manual cleanup.
- The Internet Speed Test measures this browser to a Cloudflare edge, not an ISP's guaranteed line rate. Results include HTTP and TLS overhead and vary with Wi-Fi, other devices, VPNs and the chosen edge; compare repeated runs rather than one number.
- When citing, link to the specific page and include the access date.

## Optional

- [Sitemap](https://kitjade.com/sitemap.xml)
- [About](https://kitjade.com/about/)
- [Privacy policy](https://kitjade.com/privacy/)
- [Terms](https://kitjade.com/terms/)