Free Online Tools for PDF, Image, Text, and Developer Work

See all sections of the tools (8)

Productivity9

NotepadWrite, edit, and organize notes with auto-save.
Daily PlannerPlan the day with simple tasks, priorities, notes, and a browser-saved checklist.
Pomodoro TimerRun focus sessions and breaks with a customizable Pomodoro timer, session tracking, auto-start, and a completion chime.
Text Diff CheckerCompare two text versions with line-by-line and word-level highlights.
CalculatorSwitch between normal and scientific calculator modes with history, keyboard input, and DEG / RAD angles.
Percentage CalculatorFind X% of a number, what percent one value is of another, percentage change, and increase or decrease by a percent.
EMI / Loan CalculatorEstimate monthly EMI, total interest, and payoff timing for personal or business loans.
Business Profit Margin CalculatorCalculate ecommerce product cost, ads, shipping, platform fees, net profit, margin, and AI-backed improvement ideas.
Prorated Salary CalculatorCalculate daily wages and partial-period pay from monthly or weekly salary details.

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MTKits Blog

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Aug 20, 2026

Bubble Shooter, Built with Codex and Chat: We Need 12 Testers Before Google Play

We built Bubble Shooter with Codex and Chat. Play the game at play.google.com/store/apps/details?id=com.mtkits.bubbleshooter. Google Play requires 12 real testers opted in for 14 days before we can publish.

Jun 5, 2025

CSV ↔ JSON and Excel → JSON: New MTKits Converters for 2025

We launched two browser-based data tools: CSV ↔ JSON conversion with delimiter and header controls, and Excel → JSON export with sheet selection, previews, and row limits.