Free AI tools by Qaynaq
27 hand-built tools for developers, parents, students, founders, and professionals. No signup. No data hoarding. Mostly free thanks to ads.
Free utilities
PDF Splitter
Split a PDF into separate files by page range. Runs entirely in your browser — your file never leaves the device.
Open the tool → Free utilitiesPDF Merger
Combine multiple PDFs into a single file. Browser-side — your files never upload.
Open the tool → Free utilitiesJPG to PDF Converter
Convert JPG/PNG images into a single PDF — page sizes, orientation, margins controlled. Browser-only.
Open the tool → Free utilitiesQR Code Generator
Free QR code generator — text, URLs, contact info, Wi-Fi. SVG and PNG export.
Open the tool → Free utilitiesOnline Timer, Stopwatch & Pomodoro
Free browser timer with countdown, stopwatch, and pomodoro modes. Sound when finished, runs even on locked tabs.
Open the tool → Free utilitiesCSV / Excel Duplicate Remover
Paste CSV, TSV, or any tabular text. Remove duplicates by column. Auto-detects delimiter. Browser-only.
Open the tool → Free utilitiesOnline Calculator — Basic & Scientific
Free browser calculator. Basic + scientific modes. Memory, history, keyboard shortcuts. No signup.
Open the tool → Free utilitiesPDF Compressor
Shrink PDF file size in your browser. Smart mode re-saves with object streams. No upload.
Open the tool →AI writing tools
AI Text Detector
Free AI content detector. Stylometric analysis with specific signals, not a single black-box score.
Open the tool → AI writing toolsAI Humanizer — Rewrite AI Text
Rewrite AI-generated text to sound human. Tone and reading-level aware. Before/after examples included.
Open the tool → AI writing toolsCover Letter Generator
Tailored cover letter drafts from your resume + the job description. With match analysis and alternative openings.
Open the tool → AI writing toolsMeeting Agenda Generator
Structured meeting agendas with timeboxes, goals, decisions expected, and follow-up template.
Open the tool → AI writing toolsAccount Deletion Helper
Delete your account from any service — exact steps, GDPR/CCPA template, what data they keep, recovery window.
Open the tool → AI writing toolsExcel Chart Recommender
Paste your data + what you want to communicate. Get the right chart type plus step-by-step Excel + Google Sheets instructions.
Open the tool → AI writing toolsFile Recovery Diagnostic
Recover corrupted or deleted photos, videos, Word, Excel, PDF. Diagnostic ladder from safest to most invasive.
Open the tool →Developer tools
HTTP Status Code Explainer
Every HTTP status code explained with causes, debugging steps, and framework code examples.
Open the tool → Developer toolsJWT Decoder + Security Audit
Decode JSON Web Tokens client-side and get a security audit of the claims.
Open the tool → Developer toolsRegex → Plain English Explainer
Token-by-token regex decomposition with match examples and pitfalls.
Open the tool → Developer toolsCron Expression Decoder + Generator
Decode cron expressions into English, or generate cron from a schedule description.
Open the tool → Developer toolsJSON → TypeScript / Pydantic / Go / Rust + 6 more
Paste any JSON and get idiomatic, compile-ready type definitions in 9 languages.
Open the tool → Developer toolscURL → Python / Node / Go / PHP / Ruby / Swift / Rust / C#
Paste any cURL command and get idiomatic client code in 10 languages and HTTP libraries.
Open the tool → Developer toolsSQL Dialect Translator
Translate SQL between PostgreSQL, MySQL, SQLite, SQL Server, Oracle, BigQuery, and Snowflake.
Open the tool → Developer toolsLLM API Cost Calculator & Comparison
Compute and compare monthly API costs across Claude, GPT, Mistral, Gemini, Llama, Cohere, DeepSeek, and Grok.
Open the tool → Developer toolsRegex Cookbook by Use Case
Battle-tested regex patterns for common dev use cases with match examples, edge cases, and code in 4 languages.
Open the tool → Developer toolsSQL Query Optimizer
Paste a slow query. Get a rewrite, index suggestions, antipattern flags, and EXPLAIN-reading hints — per dialect.
Open the tool → Developer toolsDNS Server Not Responding — Troubleshooter
Step-by-step diagnostic ladder for 'DNS server not responding' errors. OS-specific commands. Free.
Open the tool →Money & legal
Reference content
10 lists of the best free software (2026)
Password managers, email clients, video editors, note-taking apps, CRM, drawing software, photo editors, download managers, coding practice sites, free fonts.
Browse the lists → How-to guidesStep-by-step how-to guides (2026)
Screenshot on Mac/Windows, share Google Calendar, use Google Drive & Scholar, cancel Amazon Prime, scan documents to PDF, recover corrupted files.
Browse the guides →