Base64 Encode
Encode Unicode text or a file to standard Base64 or a Data URL online for free. Convert, copy, and download locally with no upload.
Free developer tools
Choose Base64 or URL conversion, JWT inspection, UUID and string generation, regex testing, or time and schedule analysis. Use each free tool directly in your browser.
Free without an account. Inputs and results are not sent to or stored on a server.
Encode and decode
Base64 Encode
Base64 Decode
Decode standard Base64 or a Data URL online for free. Preview valid UTF-8 text or download the original bytes locally with no server upload.
URL Encode
Encode text, Unicode, spaces, and URLs online for free. Choose component, full URL, or form value mode with no server upload.
URL Decode
Decode percent-encoded URLs and UTF-8 text online for free. Restore components, full URLs, or form values with no upload.
JWT Decoder
Decode JWT header and payload online for free, inspect exp, nbf, and iat, and keep the token in your browser. Clear guidance separates decoding from signature verification.
Generate IDs and strings
UUID Generator
Generate secure UUID v4 and time-ordered UUID v7 values online for free. Create 1–1,000 locally, then copy or download TXT with no server upload.
Random String Generator
Generate random strings free with alphanumeric, hexadecimal, Base64 URL-safe or a custom alphabet. Create up to 100,000 characters locally.
Test regular expressions
Regex Tester
Test JavaScript regular expressions for free. Inspect matches, positions, numbered captures, and named groups locally in your browser.
Check times and schedules
Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps for free. Compare seconds, milliseconds, UTC, and device time locally with no upload.
Cron Expression Parser
Parse a Unix 5-field cron expression for free, understand every field, and check the next 10 runs in device time or UTC.
Choosing a developer tool
1Does Base64 or JWT decoding verify security?
No. Base64 is not encryption. The JWT decoder reads the Header and Payload but does not verify the signature. Do not trust a token or grant access based only on decoded content or time indicators.
2Which URL and regex rules are used?
Choose between URL component, full URL and form value modes. The regex tester uses JavaScript syntax, so results may differ from regular expressions in other languages.
3Do time conversion or Cron analysis run jobs?
No. Check seconds versus milliseconds and UTC versus device local time when converting timestamps. The Cron tool analyzes expressions and execution times; it does not schedule or execute jobs.