The best private tools to
convert, format & calculate
Format code, edit files, and run calculations instantly. Over 500+ utilities running 100% in your browser memory.
Explore the toolbox
Search across every tool or filter by category. Each one runs instantly, right in your browser.
Mortgage Calculator
Calculate mortgage calculator with real-time mathematical breakdowns, amortization schedules, and instant reporting.
JSON Formatter & Validator
Format, validate, and beautify JSON online. Parse and reformat data formats.
Merge PDF
Merge multiple PDF files into one document directly in your browser. Reorder pages and combine files with zero server uploads.
Age Calculator
Calculate age calculator with real-time mathematical breakdowns, amortization schedules, and instant reporting.
Word & Character Counter
Free, client-side Word & Character Counter utility. Runs 100% locally in your browser with complete privacy.
Compound Interest
Calculate compound interest with real-time mathematical breakdowns, amortization schedules, and instant reporting.
Regex Tester & Debugger
Test, debug, and validate regular expressions against sample text with real-time match highlighting.
Image Compressor
Process and optimize image compressor files locally inside browser RAM with zero server transfers.
Caffeine Half-Life & Sleep Predictor
Calculate caffeine remaining in your bloodstream at bedtime using pharmacokinetic decay formulas to protect deep sleep recovery.
Diff & Text Compare
Compare text and code side-by-side to highlight additions, deletions, and character differences in real time client-side.
Coast FIRE & Freedom Date Calculator
Calculate your Coast FIRE number and find when current investments will compound into full retirement without extra savings.
AI Task Exposure & Automation Risk Calculator
Calculate your software engineering workflow's AI exposure percentage, identify tasks susceptible to LLM automation, and optimize your developer skill moat.
HEIC to JPG
Free, client-side HEIC to JPG utility. Runs 100% locally in your browser with complete privacy.
Unit Converter
Convert and transform unit converter data formats securely in your browser memory.
Case Converter
Convert and transform case converter data formats securely in your browser memory.
Percentage Calculator
Calculate percentage calculator with real-time mathematical breakdowns, amortization schedules, and instant reporting.
Compress PDF to 100KB
Process and optimize compress pdf to 100kb files locally inside browser RAM with zero server transfers.
Base64 Encode / Decode
Encode and decode plain text and binary strings to and from standard Base64 format locally in your browser.
PDF to JPG
Free, client-side PDF to JPG utility. Runs 100% locally in your browser with complete privacy.
Days Between Dates Calculator
Calculate days between dates calculator with real-time mathematical breakdowns, amortization schedules, and instant reporting.
JWT Decoder
Decode and inspect JSON Web Token (JWT) headers, payloads, and signatures client-side with complete privacy.
Loan Comparison
Calculate loan comparison with real-time mathematical breakdowns, amortization schedules, and instant reporting.
Image to Text (OCR)
Free, client-side Image to Text (OCR) utility. Runs 100% locally in your browser with complete privacy.
Remove Duplicate Lines
Free, client-side Remove Duplicate Lines utility. Runs 100% locally in your browser with complete privacy.
Cron Expression Parser
Parse, explain, and validate standard 5-part cron schedules into plain English with next run timestamps.
Split PDF
Split PDF pages and extract specific page ranges instantly in your browser memory with 100% privacy and zero file uploads.
Rent Hike vs. Moving Cost Calculator
Calculate break-even timelines when facing a lease rent increase versus moving to a new rental, factoring moving costs and broker fees.
Time Zone Converter
Convert and transform time zone converter data formats securely in your browser memory.
SQL Formatter & Beautifier
Beautify, indent, and format SQL queries for PostgreSQL, MySQL, SQLite, and standard SQL dialects.
Lorem Ipsum Generator
Generate customizable Latin placeholder text by paragraphs, words, or sentences with HTML and plain text export.
Image to PDF Converter
Convert and transform image to pdf converter data formats securely in your browser memory.
UUID Generator
Generate cryptographically random RFC 4122 v4 UUIDs in single or bulk batches with zero server tracking.
Subscription Creep & Wealth Leakage Calculator
Calculate the true long-term opportunity cost of recurring micro-subscriptions and visualize lost compound investment wealth over time.
Discount Calculator
Calculate discount calculator with real-time mathematical breakdowns, amortization schedules, and instant reporting.
Find and Replace
Free, client-side Find and Replace utility. Runs 100% locally in your browser with complete privacy.
Credit Card Points vs. Cash Calculator
Calculate cents-per-point (CPP) valuations, compare flight and hotel reward redemptions against cash prices, and identify high-arbitrage award bookings.
Image Resizer
Process and optimize image resizer files locally inside browser RAM with zero server transfers.
QR Code Generator
Generate and customize qr code generator client-side with instant formatting and zero server uploads.
Sharpe Ratio Calculator
Calculate portfolio Sharpe Ratio, annualized risk-adjusted returns, and excess return over benchmark risk-free rates.
401(k) / Pension Calculator
Calculate 401(k) / pension calculator with real-time mathematical breakdowns, amortization schedules, and instant reporting.
HTML to Markdown Converter
Convert and transform html to markdown converter data formats securely in your browser memory.
cURL to Fetch Converter
Convert cURL terminal commands into modern JavaScript fetch syntax with headers, body, and method parsing.
Salary Calculator
Calculate salary calculator with real-time mathematical breakdowns, amortization schedules, and instant reporting.
Slug Generator
Generate and customize slug generator client-side with instant formatting and zero server uploads.
Password Strength Meter
Free, client-side Password Strength Meter utility. Runs 100% locally in your browser with complete privacy.
Engineered for Absolute Data Privacy & Speed
Traditional online converters and utility sites send your sensitive files and calculations to remote servers. ToolboxDock executes every algorithm locally in your device RAM.
100% Client-Side Privacy
Calculations, PDF manipulations, image conversions, and code formatting occur strictly inside your browser sandbox. Your proprietary code and financial figures never touch external servers.
Sub-Millisecond Execution
Eliminate network latency and cloud processing queues. Powered by native WebAssembly (Wasm) and JavaScript V8 optimizations for instantaneous calculations and rendering.
Unlimited & Unrestricted
Enjoy all 500+ utilities completely free with zero subscription paywalls, no daily usage caps, no watermarks, and no mandatory account registration.
Everything You Need in One Unified Workspace
Replace dozens of single-purpose bookmarked websites with a unified, high-performance suite of client-side utilities.
Developer Suite
Format JSON, inspect JWTs, test regular expressions, generate UUIDs, beautify SQL, and hash data client-side.
- JSON & SQL Formatters
- JWT & Base64 Decoders
- Regex Debugger & Tester
Finance & Business
Model loan amortization, mortgage payments, compound interest, tax brackets, and generate professional invoices.
- Loan & Mortgage Schedules
- Compound Interest & SIP
- Invoice & Receipt Builders
PDF & Documents
Merge, split, and compress PDFs locally in browser WebAssembly without uploading confidential contracts.
- Merge & Split PDFs
- Client-Side PDF Compression
- Image to PDF Conversion
Text & Daily Tools
Diff text, generate QR codes, create secure passwords, convert units, and preview Markdown files instantly.
- Text Diff & Word Counters
- Custom QR Code Generator
- Secure Password Generator
Frequently Asked Questions
Everything you need to know about ToolboxDock's privacy model, performance, and free access.