Local-first engineering workstation
AI Engineer Toolbox
A focused collection of browser-side tools and study pages for AI application engineers who work with prompts, payloads, streaming APIs, retrieval systems, and integration security.
AI ChatMulti-provider AI chat with OpenAI, Anthropic, Gemini, DeepSeek, OpenRouter, and more. API key stored locally.
JSON FormatterFormat, minify, and validate JSON without uploading it.
AES EncryptorEncrypt and decrypt with AES-GCM, AES-CBC, or AES-ECB. Supports multiple paddings and key/IV/input/output encodings.
Base64 TextEncode and decode UTF-8 text as Base64.
Recently Used
View allAI ChatMulti-provider AI chat with OpenAI, Anthropic, Gemini, DeepSeek, OpenRouter, and more. API key stored locally.
JSON FormatterFormat, minify, and validate JSON without uploading it.
AES EncryptorEncrypt and decrypt with AES-GCM, AES-CBC, or AES-ECB. Supports multiple paddings and key/IV/input/output encodings.
Base64 TextEncode and decode UTF-8 text as Base64.
AI Tools
View allCrypto Tools
View allAES EncryptorEncrypt and decrypt with AES-GCM, AES-CBC, or AES-ECB. Supports multiple paddings and key/IV/input/output encodings.
DES Compatibility ToolDES with CBC, ECB, CFB, OFB, and CTR modes. Supports padding and multiple encodings for key, IV, input, and output.
SM4 Compatibility ToolSM4-CBC and SM4-ECB with configurable padding and encoding support for key, IV, input, and output.
Hash GeneratorGenerate MD5, SHA-1, SHA-256, and SHA-512 digests. Input supports text, Base64, or Hex encoding.
HMAC GeneratorGenerate keyed digests with HMAC-MD5, HMAC-SHA256, or HMAC-SHA512. Key and message support multiple encodings.
Study
View allRecent Updates
2026-05-20: v1 implementation with static export, GitHub Pages workflow, and custom domain support.
2026-05-20: Added local browser tools for crypto, JSON, Base64, URL, SSE, messages, prompts, and token estimation.