All-in-One Tools Collection

A broad collection of online tools for development, AI, design, and productivity tasks.

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Advanced PDF repair with detailed diagnostics, before/after comparison, and repair logging

Simulate Texas Hold'em equity against random opponents, estimate win and tie rates, and list next-card improvement outs

Generate a full mortgage amortization table, compare extra-payment scenarios, and visualize total interest savings

Crop PDF pages by removing margins from edges

Delete specified pages from a PDF document

Advanced PDF optimization: remove metadata, clean structure, and recompress content

Adjust PDF pages to standard paper sizes (A4, Letter, etc.)

Rotate PDF pages by specified degrees (90°, 180°, 270°)

Lint robots.txt syntax, flag risky rules, and test important URLs before you ship crawler directives

Export one image into nine social-ready crops for Instagram, X, LinkedIn, YouTube, Facebook, Xiaohongshu, and TikTok

Look up electron configurations, shell distributions, valence electrons, and orbital diagrams by element symbol or atomic number

Calculate molar mass, elemental composition, and mass percentages from a chemical formula