💻 编码 / 开发
JSON / Base64 / URL / 时间戳 / 哈希 / UUID / 正则 / 进制 All 13 tools run 100% locally in your browser — files are never uploaded, free to use.
JSON Formatter / Validator
Format, minify and validate JSON locally, with error line location.
Base64 Encode / Decode
Encode/decode text & images to Base64 locally, Chinese supported.
URL Encode / Decode
Percent-encode and decode URLs/text locally.
Timestamp Converter
Convert between timestamp (sec/ms) and date-time locally.
Hash Calculator
Compute MD5/SHA1/SHA256/SHA512 digests locally.
UUID Generator
Generate batch UUID v4 locally with crypto randomness.
Regex Tester
Test regex match/replace locally, highlight hits.
Base Converter
Convert between binary/octal/decimal/hex locally, big int.
RMB Uppercase
Convert numeric amounts to Chinese capital locally, copy-ready.
JWT Decoder
Decode the three JWT parts locally and pretty-print.
Cron Parser
Parse cron meaning and predict next runs locally.
CSV ↔ JSON Converter
Convert CSV and JSON both ways locally, multiple delimiters.
AES Text Encrypt / Decrypt
Encrypt/decrypt text locally with AES-GCM, passphrase stays local.
About 编码 / 开发
编码 / 开发 tools run entirely in your browser locally — no upload needed, faster and more private. We keep adding more 编码 / 开发 tools.
FAQ
Do these tools need to upload files?
No. All processing is done locally in your browser; files never leave your device.
Does it work on mobile?
Yes. The site is responsive and works on phones, tablets, and desktop browsers.