# PocketKit 口袋工具箱 (PocketKit)

> A free bilingual online toolbox with browser-local file processing and clearly disclosed live-data requests.

Core PDF, image, text, and cryptographic file processing stays in the browser without file uploads. Live-data and community features use network requests described in the privacy policy. Site: https://www.pokitx.com
Simplified Chinese versions of every page live under the /zh prefix (for example https://www.pokitx.com/zh/tools/).

## Online Tools

### Developer Tools
- [AI Prompt & System Prompt Generator](https://www.pokitx.com/tools/prompt-generator): Structure and optimize system prompts for DeepSeek, Claude, and ChatGPT with code review, translation and content templates
- [Claude Env Scanner & Region Checker](https://www.pokitx.com/tools/claude-env-check): Check browser timezone, system locale, language, and font fingerprints to detect Claude region blocking or account ban risks, helping you secure proxy configurations.
- [Claude Proxy Network Checker (Exit IP & Timezone)](https://www.pokitx.com/tools/claude-net-check): Detect your real exit IP and region, cross-check it against system timezone, language and WebRTC leaks to find proxy exposure points and reduce Claude ban risk
- [AI Token Counter & Cost Estimator](https://www.pokitx.com/tools/token-counter): Estimate token counts locally and compare API costs across Claude, GPT, Gemini and DeepSeek models
- [LLM API Pricing Comparison](https://www.pokitx.com/tools/llm-pricing): Compare input/output/cached prices, context windows and blended cost across Claude, GPT, Gemini and DeepSeek
- [Tool & Function Schema Converter](https://www.pokitx.com/tools/tool-schema-converter): Convert between Claude tool, OpenAI function, Gemini functionDeclaration and JSON Schema — with strict mode
- [JWT Parser](https://www.pokitx.com/tools/jwt-parser): Decode and parse JWT tokens offline
- [Cron Generator](https://www.pokitx.com/tools/crontab-generator): Generate and parse Cron expressions with execution schedule preview
- [Keycode Info](https://www.pokitx.com/tools/keycode-info): Get keyboard event key, code, and keycode details
- [User Agent Parser](https://www.pokitx.com/tools/user-agent-parser): Parse User Agent strings to identify browser, OS, and device
- [Bcrypt Generator](https://www.pokitx.com/tools/bcrypt): Generate and verify Bcrypt password hashes
- [HMAC Generator](https://www.pokitx.com/tools/hmac-generator): Compute HMAC signatures (SHA256/512) for messages
- [IPv4 Subnet Calculator](https://www.pokitx.com/tools/ipv4-subnet-calculator): Compute subnet mask, network range, usable IPs and binary format
- [Docker Compose Converter](https://www.pokitx.com/tools/docker-compose-converter): Convert docker run commands to docker-compose.yml format
- [Chmod Calculator](https://www.pokitx.com/tools/chmod-calculator): Calculate Linux file/directory permission values and command
- [BIP39 Generator](https://www.pokitx.com/tools/bip39-generator): Generate and verify multi-language BIP39 mnemonic phrases
- [ULID Generator](https://www.pokitx.com/tools/ulid-generator): Generate lexicographically sortable unique identifiers
- [URL Parser](https://www.pokitx.com/tools/url-parser): Parse URL structures and edit query parameters interactively
- [JSON Formatter](https://www.pokitx.com/tools/json-formatter): Format, minify and validate JSON
- [Timestamp Converter](https://www.pokitx.com/tools/timestamp): Convert between Unix time and dates
- [URL Encode/Decode](https://www.pokitx.com/tools/url-encoder): Encode / decode URL components
- [Base Converter](https://www.pokitx.com/tools/base-converter): Convert between 2/8/10/16
- [ASCII Table](https://www.pokitx.com/tools/ascii-table): Look up ASCII 0-127
- [HTTP Status Codes](https://www.pokitx.com/tools/http-status-codes): Common status codes reference
- [Password Generator](https://www.pokitx.com/tools/random-generator): Generate secure random passwords
- [Docker Command](https://www.pokitx.com/tools/docker-generator): Build a docker run command
- [Windows Commands](https://www.pokitx.com/tools/win-cmd-generator): Generate common Windows commands
- [Linux Commands](https://www.pokitx.com/tools/linux-cmd-generator): Generate common Linux commands
- [Regex Tester](https://www.pokitx.com/tools/regex-tester): Test regex matches and groups live
- [UUID Generator](https://www.pokitx.com/tools/uuid): Generate UUID v4 in bulk
- [Hash](https://www.pokitx.com/tools/hash): MD5 / SHA-1 / SHA-256…
- [AES Encrypt](https://www.pokitx.com/tools/aes): AES-256-GCM with password
- [RSA](https://www.pokitx.com/tools/rsa): Generate keypair, encrypt/decrypt
- [MIME Types](https://www.pokitx.com/tools/mime-type): Extension ⇄ MIME lookup
- [Code Formatter](https://www.pokitx.com/tools/code-format): Beautify JS / JSON / CSS / HTML
- [UCharts Builder](https://www.pokitx.com/tools/ucharts): Create beautiful interactive charts from raw data grids locally
- [SQL Formatter](https://www.pokitx.com/tools/sql-formatter): Beautify SQL by breaking and indenting at major clauses and normalizing keyword case
- [JSON to Types](https://www.pokitx.com/tools/json-to-types): Infer TypeScript interfaces, Go structs or Python TypedDict from JSON, with nested types and array merging
- [GPT Token Counter](https://www.pokitx.com/tools/gpt-token-counter): Count GPT-4o/4/3.5 tokens exactly with OpenAI's official BPE (o200k/cl100k) locally and estimate cost
- [cURL to Code](https://www.pokitx.com/tools/curl-converter): Convert a curl command into JS fetch / axios / Python requests / Go code, detecting method, headers and JSON body

### Going-Global Tools
- [Privacy Policy Generator](https://www.pokitx.com/tools/privacy-policy-generator): Generate an English privacy policy for App Store / Google Play / Stripe with GDPR / CCPA clauses
- [Test Card Numbers & Luhn Check](https://www.pokitx.com/tools/card-test-numbers): Validate card numbers (Luhn) and brand, generate valid test numbers, and list common gateway test cards
- [Stripe Fee & Net Calculator](https://www.pokitx.com/tools/stripe-fee-calculator): Compute Stripe fees and net payout, reverse-solve the charge for a target net, plus international / FX surcharges
- [Multi-Currency & Charm Pricing](https://www.pokitx.com/tools/currency-pricing): Convert one base price to many currencies with .99 / round charm pricing for global pricing pages; editable rates, offline
- [VAT / GST Calculator](https://www.pokitx.com/tools/vat-calculator): Look up VAT/GST standard rates by country and convert net ⇄ gross for cross-border invoicing
- [DNS Lookup](https://www.pokitx.com/tools/dns-lookup): Query A / AAAA / MX / TXT / NS / CNAME / CAA records via Cloudflare DNS-over-HTTPS, right in your browser
- [Email Deliverability Check (SPF/DKIM/DMARC)](https://www.pokitx.com/tools/email-deliverability): Check a domain's SPF, DKIM and DMARC records with fix-it advice to improve inbox placement for outbound mail
- [Deploy Config Generator](https://www.pokitx.com/tools/deploy-config): Generate _headers / _redirects (Cloudflare Pages / Netlify) and vercel.json — SPA fallback, security headers, caching, redirects
- [CORS Config Generator](https://www.pokitx.com/tools/cors-generator): Configure CORS headers visually and generate Express / Nginx / Cloudflare Worker snippets, with credentials/wildcard warnings
- [robots.txt Generator](https://www.pokitx.com/tools/robots-generator): Build robots.txt from per-user-agent groups with Allow/Disallow, Crawl-delay, Sitemap and one-click AI-crawler blocking
- [i18n JSON Checker](https://www.pokitx.com/tools/i18n-checker): Diff two locale JSON files for missing/extra keys and placeholder mismatches — essential for frontend i18n
- [hreflang Tag Generator](https://www.pokitx.com/tools/hreflang-generator): Generate hreflang and x-default tags for multilingual sites (subdir / subdomain / query strategies) to avoid duplicate content
- [Timezone Meeting Planner](https://www.pokitx.com/tools/timezone-meeting): From your local time, see the same moment across US/EU/Asia zones with day-offset — for scheduling meetings and launches
- [UTM Link Builder](https://www.pokitx.com/tools/utm-builder): Build UTM-tagged tracking URLs with consistent source/medium/campaign naming for ads, email and social attribution
- [Open Graph Meta Generator](https://www.pokitx.com/tools/og-meta-generator): Generate Open Graph and Twitter Card meta tags with a live social-card preview for rich link previews on Facebook, X and chat apps

### Download Tools
- [TikTok Video Downloader](https://www.pokitx.com/tools/tiktok-downloader): Parse public TikTok links and save available MP4 video or extract its audio. Resolution and watermark status depend on the source media stream.
- [TikTok MP3 Sound Downloader](https://www.pokitx.com/tools/tiktok-mp3-downloader): Extract complete audio tracks and BGMs from public TikTok videos, preview them online and save MP3 when available. Bitrate depends on the source audio.
- [Suno AI Music Downloader](https://www.pokitx.com/tools/suno-downloader): Parse public Suno AI music links and retrieve available audio, artwork and lyrics. Formats and quality depend on the public source item.
- [Suno AI Video Downloader](https://www.pokitx.com/tools/suno-video-downloader): Parse public Suno links and save available MP4 music videos. Resolution, captions and availability depend on the source item.

### Calculators
- [Loan Calculator](https://www.pokitx.com/tools/loan-calculator): Monthly payment, total interest and full amortization
- [Percentage Calculator](https://www.pokitx.com/tools/percentage-calculator): X% of Y, ratios and percent change
- [Discount Calculator](https://www.pokitx.com/tools/discount-calculator): Sale price and savings, with stacked discounts and tax
- [Tip Calculator](https://www.pokitx.com/tools/tip-calculator): Tip and total by rate, split across people
- [Sales Tax Calculator](https://www.pokitx.com/tools/sales-tax-calculator): US state sales tax, with tax-inclusive reverse mode
- [Compound Interest Calculator](https://www.pokitx.com/tools/compound-interest-calculator): Compound growth with optional monthly contributions
- [GPA Calculator](https://www.pokitx.com/tools/gpa-calculator): Calculate overall and semester GPA with course grades, credits and various grading scales (4.0, 4.3, 5.0, WES).
- [BMR & TDEE Calculator](https://www.pokitx.com/tools/bmr-calculator): Compute Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) with Mifflin-St Jeor & Harris-Benedict formulas.
- [Mortgage Refinance Calculator](https://www.pokitx.com/tools/mortgage-refinance-calculator): Compare your current mortgage with refinance options to find monthly savings, total interest saved, and the break-even period.
- [Currency Converter](https://www.pokitx.com/tools/currency-converter): Convert 30+ currencies at live mid-market rates with edge caching and offline fallback — for global pricing and expenses

### PDF Tools
- [Merge PDF](https://www.pokitx.com/tools/pdf-merge): Combine multiple PDFs
- [Split PDF](https://www.pokitx.com/tools/pdf-split): Split PDF by page or range
- [Organize PDF](https://www.pokitx.com/tools/pdf-organize): Delete / rotate / reorder pages
- [PDF to Image](https://www.pokitx.com/tools/pdf-to-image): Export each page as PNG
- [PDF Password](https://www.pokitx.com/tools/pdf-encrypt): Add or remove PDF password

### Converters
- [Base64 Encode/Decode](https://www.pokitx.com/tools/base64): Convert text to/from Base64
- [Unit Converter](https://www.pokitx.com/tools/unit-converter): Convert length, weight, temperature…
- [ZIP Extractor](https://www.pokitx.com/tools/archive-extractor): Unzip locally and download files
- [Byte Calculator](https://www.pokitx.com/tools/byte-calc): Convert B / KB / MB / GB
- [Punycode](https://www.pokitx.com/tools/punycode): IDN domain ⇄ Punycode
- [Data Converter](https://www.pokitx.com/tools/data-converter): Convert CSV / JSON / XML

### Image Tools
- [AI Image Ratio & Resolution Calculator](https://www.pokitx.com/tools/ai-image-ratio): Calculate exact pixel resolution, aspect ratios and --ar parameters for Midjourney, Flux.1, and SDXL image generators
- [Photo Exif & GPS Privacy Cleaner](https://www.pokitx.com/tools/exif-cleaner): 100% in-browser removal of photo GPS locations, device models, exposure and Exif privacy metadata
- [QR Code Generator](https://www.pokitx.com/tools/qr-code): Turn text or links into a QR code
- [WiFi QR Code](https://www.pokitx.com/tools/wifi-qr-code-generator): Generate a QR code to connect to your WiFi network
- [SVG Placeholder](https://www.pokitx.com/tools/svg-placeholder-generator): Generate and download custom SVG placeholder images
- [Color Converter](https://www.pokitx.com/tools/color-converter): Convert between HEX / RGB / HSL
- [Image Compressor](https://www.pokitx.com/tools/image-compressor): Compress images locally
- [Image Converter](https://www.pokitx.com/tools/image-converter): Convert PNG / JPG / WebP
- [AI Background Remover](https://www.pokitx.com/tools/background-remover): One-click AI cutout in your browser — no upload
- [ID Photo Maker](https://www.pokitx.com/tools/id-photo-maker): Auto cutout, bg swap & standard ID sizes
- [Screenshot Beautifier](https://www.pokitx.com/tools/screenshot-beautifier): Add gradient background, rounded corners & shadow
- [Signature Pad](https://www.pokitx.com/tools/signature): Draw a signature, export PNG
- [Screen Color Picker](https://www.pokitx.com/tools/screen-color-picker): Sample any color on screen
- [Grid Splitter](https://www.pokitx.com/tools/grid-splitter): Split an image into tiles, zip them
- [Images to PDF](https://www.pokitx.com/tools/image-to-pdf): Combine images into one PDF
- [Image to Base64](https://www.pokitx.com/tools/image2base64): Image to DataURL / CSS
- [Favicon Maker](https://www.pokitx.com/tools/favicon): Export PNG icons of each size
- [Image Crop](https://www.pokitx.com/tools/image-crop): Drag to crop an image
- [Image Effects](https://www.pokitx.com/tools/image-filter): Grayscale / flip / border / pixelate
- [EXIF Viewer](https://www.pokitx.com/tools/image-exif): View & strip image metadata
- [Image to Pixel Art](https://www.pokitx.com/tools/image-to-pixel): Convert images locally into retro 8-bit pixel art styles
- [Art Avatar Generator](https://www.pokitx.com/tools/art-avatar): Customize and generate beautiful vector avatars with SVG/PNG exports
- [CSS Gradient Generator](https://www.pokitx.com/tools/gradient-generator): Visually tune angle and color stops to preview and generate linear/radial gradient CSS
- [CSS Box-Shadow Generator](https://www.pokitx.com/tools/box-shadow-generator): Visually build multi-layer box-shadow and inset shadows with live preview and copyable CSS
- [Glassmorphism Generator](https://www.pokitx.com/tools/glassmorphism-generator): Generate frosted-glass (glassmorphism) effects with backdrop-filter — tune blur/opacity/border and copy CSS
- [Contrast Checker (WCAG)](https://www.pokitx.com/tools/contrast-checker): Check foreground/background contrast against WCAG accessibility levels (AA/AAA) with a live readability preview

### Text Tools
- [Word Counter](https://www.pokitx.com/tools/word-counter): Count characters, words, lines
- [HTML ⇄ Markdown](https://www.pokitx.com/tools/html-markdown): Convert between HTML and Markdown
- [Case Converter](https://www.pokitx.com/tools/case-converter): Convert strings between camelCase, snake_case, kebab-case etc.
- [List Converter](https://www.pokitx.com/tools/list-converter): Convert simple lists into JSON arrays, SQL IN lists, or CSVs
- [HTML Entities](https://www.pokitx.com/tools/html-entities): Encode and decode HTML entity character representations safely
- [Stealth Reader](https://www.pokitx.com/tools/doc-reader): Blog-disguised TXT novel reader
- [Text Diff](https://www.pokitx.com/tools/text-diff): Highlight line-by-line differences
- [Special Symbols](https://www.pokitx.com/tools/special-symbols): Symbol library, click to copy
- [Emoji Picker](https://www.pokitx.com/tools/emoji): Emoji by category, click to copy
- [ASCII Art](https://www.pokitx.com/tools/ascii-art): Turn text into ASCII banners
- [Chinese Convert](https://www.pokitx.com/tools/zh-convert): Simplified ⇄ Traditional Chinese
- [Markdown Table Generator](https://www.pokitx.com/tools/markdown-table): Edit tables visually and generate Markdown table code, with per-column alignment, add/remove rows and columns
- [Lorem Ipsum Generator](https://www.pokitx.com/tools/lorem-ipsum): Generate classic Lorem Ipsum placeholder text by paragraphs, sentences or words for layout mockups
- [Text Line Tools](https://www.pokitx.com/tools/text-lines): Dedupe, sort, drop blanks, trim and reverse text by line — batch-clean text with live toggles

### Audio & Video
- [Text to Speech](https://www.pokitx.com/tools/text-to-speech): Read text aloud
- [Online Piano](https://www.pokitx.com/tools/piano): Play with keyboard or mouse

### Lifestyle Tools
- [BMI Calculator](https://www.pokitx.com/tools/bmi): Calculate body mass index
- [Stopwatch](https://www.pokitx.com/tools/stopwatch): Timing with laps
- [Day Counter](https://www.pokitx.com/tools/anniversary): Days to / since a date
- [ID Card Check](https://www.pokitx.com/tools/id-card): Validate & parse ID numbers

### Fun & Games
- [Reaction Test](https://www.pokitx.com/tools/reaction-test): Test your reaction time
- [What to Eat](https://www.pokitx.com/tools/what-to-eat): Decide what to eat
- [Filler Text](https://www.pokitx.com/tools/bullshit-generator): Topic → long filler text
- [Payment Voice](https://www.pokitx.com/tools/alipay-voice): Speak a payment-received line
- [Shape Recall Game](https://www.pokitx.com/tools/shape-recall): Recreate random geometric shapes from memory by dragging, scaling, and rotating
- [Time Memory Game](https://www.pokitx.com/tools/time-memory-game): Test your time perception by holding down a button to match system pulse durations
- [Sound Memory Game](https://www.pokitx.com/tools/sound-memory-game): Test your pitch memory by matching sound wave frequencies with a tone slider

## Tool Categories

- [Format Converters](https://www.pokitx.com/tools/convert)
- [Media Downloaders](https://www.pokitx.com/tools/download)
- [Going-Global Tools](https://www.pokitx.com/tools/oversea)
- [Online Calculators](https://www.pokitx.com/tools/calculators)
- [Text Tools](https://www.pokitx.com/tools/text)
- [PDF Tools](https://www.pokitx.com/tools/pdf)
- [Image Tools](https://www.pokitx.com/tools/image)
- [Developer Tools](https://www.pokitx.com/tools/developer)
- [AI and LLM Tools](https://www.pokitx.com/tools/ai)


## Competitor Comparisons & Alternatives

Detailed feature comparison tables highlighting why PocketKit's 100% client-side privacy-first design outperforms cloud upload competitors.

- [PocketKit vs Smallpdf](https://www.pokitx.com/vs/smallpdf): Looking for a free Smallpdf alternative? PocketKit runs 100% locally inside your browser with zero file uploads, no daily caps, and absolute privacy.
- [PocketKit vs iLovePDF](https://www.pokitx.com/vs/ilovepdf): Searching for an iLovePDF alternative? PocketKit provides ad-free, 100% client-side WebAssembly PDF processing tools with complete data safety.
- [PocketKit vs IT-Tools](https://www.pokitx.com/vs/it-tools): An upgraded alternative to IT-Tools for developers. In addition to classic dev tools, PocketKit features Claude env checkers, AI Token cost calculators, and AI game galleries.
- [PocketKit vs TinyWow](https://www.pokitx.com/vs/tinywow): Searching for a TinyWow alternative without CAPTCHAs or network queues? PocketKit offers an ad-free client-side utility suite.

## Blog

In-depth articles on browser tools, practical workflows and building for a global audience.

- [How to Download Suno AI Music & TikTok Videos Without Watermark (Free 2026 Guide)](https://www.pokitx.com/blog/download-suno-tiktok-media-guide): Comprehensive 2026 guide for downloading Suno AI music & TikTok media: lossless 320kbps MP3 extraction, 1080p lyric video generation, watermark-free MP4 saving, CapCut workflows, and copyright Fair Use rules.
- [AI Cost Optimization Guide: Cut LLM API Bills from $500 to $50/Month](https://www.pokitx.com/blog/llm-cost-reduction-guide): 4 practical strategies for reducing LLM API token costs: Model Routing, Prompt Caching discounts, Tokenizer optimization, and Tool Schema validation.
- [Beyond the Cloud: 7 Privacy-First In-Browser AI Tools](https://www.pokitx.com/blog/ai-tools-ecosystem-guide): A practical review of 7 in-browser AI tools: WASM photo background removal, system prompt generator, token cost calculator, Claude risk checker, and AI game prompts.
- [Generative Engine Optimization (GEO): How to Get Cited by Perplexity & ChatGPT Search](https://www.pokitx.com/blog/geo-generative-engine-optimization-guide): A practical deep dive into Generative Engine Optimization (GEO) in 2026, covering high-citability TL;DR blocks, rich JSON-LD schemas, technical standard citations, and llms.txt integration.
- [Competitor Analysis: Why Zero-Server Processing Outperforms Smallpdf & iLovePDF](https://www.pokitx.com/blog/zero-server-tools-architecture): Benchmarking traditional cloud tools (Smallpdf, iLovePDF) against client-side WebAssembly architecture (PocketKit, IT-Tools) across security, latency, infrastructure costs, and performance limits.
- [Is Your PDF Safe? 3 Ways to Verify Online Tool Uploads](https://www.pokitx.com/blog/verify-online-tool-uploads): "We are safe" is an unfalsifiable claim. Use the offline test, the DevTools Network panel and resource-loading shape to verify for yourself whether any online tool uploads your files — plus how in-browser processing actually works, what it costs, and when cloud is the right call.
- [5 Silent SEO Failures in Vite SPA: A Post-Mortem](https://www.pokitx.com/blog/spa-seo-silent-failures): The build log said success while the generated HTML held nothing. A post-mortem of five silently failing spots in a Vite + React SPA — broken shell injection, a regex spanning records, shell-vs-runtime title conflicts, related links starving the long tail — plus a copy-paste build-output checklist.
- [AI Web Game Prompt Playbook: Build HTML5 Games](https://www.pokitx.com/blog/ai-game-prompt-guide): Treat your game-generation prompt like a mini PRD. An 8-part skeleton plus a full worked example for getting AI to generate a playable browser game in one shot.
- [Audit Browser Fingerprints & Avoid Claude Region Bans](https://www.pokitx.com/blog/claude-fingerprint-guide): A deep dive into Anthropic Claude frontend risk detection mechanisms, inspecting timezone-IP mismatches, WebGL GPU fingerprints, and how to run free client-side audits.
- [LLM API Token Cost: Claude vs GPT vs DeepSeek](https://www.pokitx.com/blog/llm-api-cost-comparison): Benchmarking LLM API input/output rates, Prompt Caching discounts, tokenizer efficiency, and simulating monthly expenditures.

## Main Pages

- [All online tools](https://www.pokitx.com/tools)
- [Tool data processing transparency](https://www.pokitx.com/data-processing)
- [Blog](https://www.pokitx.com/blog)