Free Online Developer & AI Tools
LLM cost calculator, GPU RAM estimator, JSON formatter, JWT decoder, Diff checker, Regex builder, and 12 more — all running locally in your browser. No signup, no uploads.
AI-Powered Calculator Suite
Plan, budget, and benchmark your LLM workloads — all in your browser, no API key required.
Prompt Token Cost Calculator
Calculate exact API cost for any prompt across GPT, Claude, Gemini and Llama. Set input + output tokens, filter by provider, and project daily/monthly spend.
Open Tool →AI Token Calculator
Count LLM tokens (GPT / Claude class), words, and characters locally in your browser.
Open Tool →LLM GPU RAM Calculator
Estimate GPU VRAM from model size (billions of parameters) and precision.
Open Tool →Token Speed Simulator
Simulate streaming token throughput (tokens per second) for LLM UIs.
Open Tool →System Prompt Builder
Build structured system prompts visually — define role, behavior rules, output format, tone, and few-shot examples. Export as plain text or JSON for any LLM.
Open Tool →Prompt Diff Viewer
Compare two prompt versions side-by-side and highlight exactly what changed — word, line, or character diff. Built for iterating on LLM prompts.
Open Tool →AI Model Comparison
Compare 20+ LLMs side-by-side — context window, API cost per 1M tokens, vision support, tool-use, and speed tier. Filter by provider.
Open Tool →Popular Developer Tools
Everything you need to be productive today.
JSON Query
Query and filter JSON data using JSONPath expressions with real-time results.
Open Tool →JSON Formatter
Validate, format, beautify and minify your JSON data.
Open Tool →JSON to SQL
Convert JSON arrays into SQL INSERT statements instantly.
Open Tool →CSV ↔ JSON
Convert CSV to JSON and JSON to CSV instantly in your browser.
Open Tool →Diff Checker
Compare text side-by-side to find differences and changes between two files.
Open Tool →Regex Builder
Write, test, and debug regular expressions with real-time match highlighting.
Open Tool →Cron Parser
Parse, validate and debug cron expressions with a human-readable schedule.
Open Tool →UUID Generator
Generate and validate UUIDs (v1, v3, v4, v5) for your applications.
Open Tool →JWT Decode
Decode and inspect JSON Web Tokens — view headers, payload and expiry locally.
Open Tool →Base64 Converter
Encode and decode Base64 strings for safe binary-to-text data transport.
Open Tool →URL Encoder
Encode or decode URLs, converting reserved and special characters safely.
Open Tool →Epoch Converter
Convert Unix timestamps to human-readable dates and vice-versa, with live clock.
Open Tool →Image to Base64
Convert images to Base64 strings for direct embedding in HTML, CSS or JSON.
Open Tool →EXIF Metadata Tool
View and strip EXIF metadata from images — remove GPS, camera, and hidden data.
Open Tool →Enterprise-Grade Performance
Professionals choose WiseCrew because we don't compromise on speed, privacy, or cost.
Bank-Grade Privacy
We don't see your files. Unlike other tools, our technology processes everything locally on your device. Zero cloud uploads.
Instant Local Processing
Experience zero latency. Whether it's a 100MB PDF or a complex calculation, it happens instantly because there's no network lag.
Always Free, No Limits
No “free credits” or “premium tiers”. WiseCrew is democratizing powerful software for everyone, forever.
How it works
Simple, transparent, and efficient.
Select Tool
Choose the utility you need from our dashboard.
Process Instantly
Your browser does the heavy lifting locally.
Download Safe
Get your file immediately. No waiting.
Complete Tool Suite for Modern Developers
From AI cost planning to JSON manipulation — everything you need for daily AI and development tasks, free and browser-local.
✨ AI & LLM Tools
Plan, budget, and benchmark your LLM workloads. Calculate exact API costs across GPT, Claude, and Gemini, estimate GPU VRAM requirements, and simulate token streaming speed — all in your browser.
- Prompt Token Cost Calculator
- AI Token Calculator
- LLM GPU RAM Calculator
- Token Speed Simulator
📊 JSON Tools
Work with JSON data effortlessly. Format, validate, query with JSONPath, convert to SQL INSERT statements, or swap between JSON and CSV — all locally.
- JSON Formatter & Validator
- JSON Query (JSONPath)
- JSON to SQL Converter
- CSV ↔ JSON Converter
🔐 Encoding & Decoding
Decode JWT tokens to inspect headers and payloads securely. Encode and decode Base64 strings for data transmission. Our URL encoder handles special characters safely.
- JWT Decoder & Inspector
- Base64 Encoder/Decoder
- URL Encoder/Decoder
🔄 Utilities & Converters
Compare text diffs, build and test regex patterns, generate UUIDs, convert Unix timestamps, and strip EXIF metadata from images — all instant and private.
- Diff Checker
- Regex Builder & Tester
- UUID Generator (v1–v5)
- Epoch/Unix Timestamp Converter
- Image to Base64 & EXIF Metadata
- Cron Parser
Why Developers Trust WiseCrew
In an era where data breaches and privacy violations make headlines daily, WiseCrew offers a fundamentally different approach to online tools. We believe your data should never leave your control.
Unlike traditional online tools that upload your files to remote servers for processing, WiseCrew leverages modern browser technologies to process everything locally on your device. Your sensitive JSON data, confidential PDFs, and private images never touch our servers or anyone else's.
Whether you're a developer debugging API responses, a data analyst converting file formats, or a privacy-conscious user managing documents, WiseCrew provides enterprise-grade tools without enterprise-level privacy risks.
Key Benefits
Zero Server Uploads
Your files are processed entirely in your browser using JavaScript and WebAssembly
No Account Required
Start using any tool immediately without signup, login, or email verification
Always Free
All tools are completely free with no file size limits or usage restrictions
Works Offline
After the initial page load, tools work without internet connection
Frequently Asked Questions
Is WiseCrew completely free?
Yes. We are supported by minimal, non-intrusive display advertising. You will never be asked for credit card details or forced to create an account.
Is my data truly secure?
Absolutely. Traditional tools upload your files to a cloud server to process them. WiseCrew uses advanced WebAssembly technology to process files directly on your computer. Your sensitive documents never leave your local machine.
Do you store any user logs?
No. We are a privacy-first platform by design. Since we don't handle your files on our servers, we have no mechanism to see or store them. Your activity remains private.