🛠️ Free Tools Hub 17 free tools · no signup

17 free tools. One place.

Calculators, developer utilities, image & PDF tools, AI prompt templates and more — every tool is 100% free, runs in your browser, and never uploads your data.

✅ No signup · No uploads · Free forever

Calculators

Free Online Calculators

BMI, percentage, loan, age & tip calculators — free, in your browser.

Compound Interest Calculator

Compound interest for recurring investments & ETFs, with projections.

Token & API Cost Calculator

Compare GPT, Claude and DeepSeek API token costs side by side.

LLM VRAM Calculator

How much GPU memory do you need to run local LLMs?

AI Image Size Calculator

Aspect ratios & sizes for AI image generation (SD, Midjourney, DALL·E).

Developer

Developer Tools

Base64, URL encode/decode, JWT decode, UUID, timestamp & hash tools.

JSON Formatter & Regex Tester

Pretty-print and validate JSON, test regular expressions live.

Password Generator

Strong random passwords with custom length, symbols & numbers.

QR Code Generator

Free QR codes for URLs, text, Wi-Fi & more — no signup.

Online Unit Converter

Length, weight, temperature, area, volume & data unit conversion.

Word & Character Counter

Count words, characters, sentences & reading time instantly.

Color Picker & Palette Tools

Color picker, palette generator, gradient maker & converters.

Media

Image Compressor & Resizer

Compress and resize images without uploading — private by design.

Images to PDF & merge PDFs — all done locally, nothing uploaded.

AI

AI Prompt Templates Library

500+ free prompts for ChatGPT, Claude & Gemini, organized by use case.

AI Bio Generator

Generate Instagram, LinkedIn, Twitter & TikTok bios with AI templates.

Productivity

Pomodoro Focus Timer

Pomodoro timer with ambient sounds to help you focus & study.

Tools formerly published as individual sites (calculators, qr-code-generator, etc.) now live here under one roof. slashmantools.us · Sitemap