Developer Tools
A JSON validator, regex tester, cron explainer, Base64 encoder, ASCII table and password generator. New to the command line? Start with the Linux lessons.
Every tool here runs on your device unless its privacy label says otherwise.
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20 tools
- JSON ValidatorValidate, fix and format JSON, with a searchable tree and private history
- Encrypt & DecryptLock text, photos or files with a password and share them as a block, a file or a link
- Regex TesterTest a regular expression live, with groups, replace and a plain-English explanation
- Cron Expression GeneratorRead a cron schedule in plain English, see its next runs, and write it for crontab, Quartz, AWS, GitHub or Kubernetes
- JSON Schema GeneratorTurn JSON samples into a JSON Schema, check it for OpenAI, Anthropic and Gemini structured outputs, and validate JSON against it
- Base64 Encoder/DecoderEncode and decode Base64 text, files and data URIs
- Password GeneratorStrong passwords and passphrases, generated on your device
- ASCII TableEvery ASCII code in binary, decimal and hex, click to copy, with control codes explained
- Text CompareCompare two texts and see every change as you type: a private diff checker for documents and code
From Learn
Developer Tools
JSON Validator
Validate, fix and format JSON, with a searchable tree and private history
OpenJSON Schema Generator
Turn JSON samples into a JSON Schema, check it for OpenAI, Anthropic and Gemini structured outputs, and validate JSON against it
OpenText Compare
Compare two texts and see every change as you type: a private diff checker for documents and code
OpenEncrypt & Decrypt
Lock text, photos or files with a password and share them as a block, a file or a link
OpenRegex Tester
Test a regular expression live, with groups, replace and a plain-English explanation
OpenCron Expression Generator
Read a cron schedule in plain English, see its next runs, and write it for crontab, Quartz, AWS, GitHub or Kubernetes
OpenBase64 Encoder/Decoder
Encode and decode Base64 text, files and data URIs
OpenASCII Table
Every ASCII code in binary, decimal and hex, click to copy, with control codes explained
OpenPassword Generator
Strong passwords and passphrases, generated on your device
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