Everyday Utility Tools, Zero Telemetry.
High-performance calculators, unit converters, and media optimizers running directly and privately inside your browser memory.
PDF to EPUB Converter
Convert PDF documents to clean, reflowable EPUB ebooks directly in your browser.
Quarterly Tax Safe Harbor Estimator
Estimate IRS quarterly estimated tax payments (Form 1040-ES), self-employment taxes (SECA), and safe harbor targets.
USDA Guarantee Fee Calculator (Section 502 Upfront & Annual Fee)
Calculate USDA Section 502 Upfront 1.00% guarantee fee, annual 0.35% monthly fee step-down schedule, and comparison against FHA loans.
Medicare IRMAA Brackets Calculator
Estimate Medicare Part B and Part D IRMAA monthly income surcharges.
NIIT Form 8960 Calculator
Calculate 3.8% Net Investment Income Tax and statutory threshold phase-ins.
401(k) Contribution Limit Calculator
Calculate 401(k) contribution limits, SECURE 2.0 catch-ups, and per-paycheck deferrals.
IRS Standard Mileage Calculator
Calculate federal tax deductions for business, medical, and charitable driving.
Social Security COLA Calculator
Estimate annual Social Security cost-of-living benefit adjustments and monthly increases.
Mortgage Buydown Calculator
Calculate temporary 2-1 and 3-2-1 buydown payment reductions and savings.
Mortgage Prepayment Penalty Calculator
Calculate mortgage prepayment penalties and penalty-free payoff thresholds.
SEP IRA Contribution Calculator
Calculate SEP IRA maximum contribution caps and estimated tax savings.
Commercial Property Insurance Calculator
Estimate commercial building and contents property insurance annual premiums.
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About ToolSlash Engine
ToolSlash is a high-performance utility platform engineered for speed, privacy, and efficiency. Our core engine powers a wide array of everyday tools - from quick converters to sophisticated text and media processors. By running complex algorithms directly in your browser, we eliminate server round-trips to deliver a seamless, lightning-fast experience.
Frequently Asked Questions
- Are the utilities free?
- Yes, all utility tools on the ToolSlash platform are 100% free to use. There are no premium tiers, hidden fees, or paywalls.
- How is data processed?
- We strongly prioritize client-side processing. Most of our tools execute entirely within your browser memory for maximum speed and zero data exposure.
- Is my data saved?
- While some computationally heavy tools may require our backend engine, your files and data are never saved, stored, or analyzed by us.