Calculators that show their work.
Professional-grade finance and developer tools — RSU tax with AMT modeling, mortgage with full PITI, cap tables with SAFE conversion, JWT decoding, schema markup. Open formulas. Cited sources. Built by an engineer who wanted accurate tools, not by a financial advisor selling services.
Most popular
RSU Tax Calculator
See the RSU under-withholding gap — supplemental withholding vs your true marginal rate, plus FICA, Medicare, and state
Federal Income Tax Estimator (2025)
Full Form 1040 estimate with wages, 1099, gains, all 5 filing statuses, standard/itemized, CTC, SE tax, LTCG, NIIT
Mortgage Calculator
Full PITI mortgage calculator with amortization schedule and PMI tracking
401(k) Calculator with Employer Match
Project your 401(k) balance with employer match, IRS limits, catch-up contributions, and Traditional vs Roth tax modeling
ISO / NQSO Stock Option Tax Calculator
Compare NQSO, ISO qualifying, and ISO disqualifying dispositions side-by-side with AMT modeling
SaaS Metrics Calculator
MRR, ARR, GRR, NRR, LTV, CAC payback, Rule of 40 — full SaaS unit-economics dashboard from one MRR waterfall
JSON Formatter
Format, validate, and minify JSON instantly
Schema Markup Generator
Generate JSON-LD schema markup for 16 schema types — instant Google rich results
Browse by category
104 tools across 10 categories
Business & Finance
15 free tools
Invoices, payroll, taxes & more
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6 free tools
Mortgage, refinance, rent vs buy & more
Retirement & Investing
8 free tools
401(k), IRA, RMD, RSU & more
Taxes
6 free tools
Federal income, SE tax, quarterly estimates & capital gains
Insurance
3 free tools
Life, disability & term vs whole life calculators
Developer Tools
20 free tools
Format, encode, generate & debug
Marketing & SEO
9 free tools
SEO, campaigns & growth tools
Writing & Content
7 free tools
Words, formatting & documents
Images & Documents
22 free tools
Compress, remove BG & more
Health & Fitness
8 free tools
BMI, calories, macros & more
- Privacy First
- Everything runs in your browser. Your files, data, and inputs never touch a server.
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- No loading screens, no upload queues. Open a tool and start immediately.
- Actually Free
- No trials, no premium tiers, no watermarks. Free means free — forever.
Free online tools that respect your time — and your data
Most “free” tools come with catches: signup walls, watermarks on every export, hidden usage limits, or aggressive tracking. FreeToolsToGo is built differently. Every tool is genuinely free — no account, no trial period, no premium tier locking away the useful features.
Everything runs directly in your browser using client-side JavaScript. Your invoices, images, passwords, JSON data, and CSV files never leave your device. There are no servers processing your content, no storage of your inputs, and no third-party integrations that could expose your data.
What you can do with FreeToolsToGo
- Images & Documents — Compress JPG, PNG, and WebP images by up to 90% with the Image Compressor, remove photo backgrounds instantly with the Background Remover, convert images to PDF with JPG to PDF, and generate professional HTML Email Signatures for Gmail and Outlook.
- Business & Finance — Create watermark-free PDF invoices with the Invoice Generator, calculate take-home pay across all 50 US states with the Paycheck Calculator, plan mortgage payments with the Mortgage Calculator, and set freelance rates with the Freelance Rate Calculator.
- Developer Tools — Format and validate JSON with the JSON Formatter, convert between formats with CSV to JSON, decode JWTs with the JWT Decoder, test regex patterns with the Regex Tester, and generate cryptographically secure passwords and UUIDs.
- Marketing & SEO — Generate custom QR codes with the QR Code Generator, build UTM tracking links with the UTM Builder, write optimized page titles with the Title Tag Generator, and preview search snippets with the SERP Snippet Preview.
- Writing & Content — Count words and characters in real time with the Word Counter, convert text between camelCase, snake_case, Title Case and 8 more formats with the Case Converter, and generate lorem ipsum placeholder text with the Lorem Ipsum Generator.
Built for professionals who move fast
Whether you're a freelancer building a client proposal, a developer debugging an API response, a marketer setting up a campaign, or a designer mocking up a layout — these tools are designed to get you the output you need in under 60 seconds, with no friction between you and the result.