Free Online Developer Tools
Encode, decode, hash and inspect data in your browser. Nothing you paste leaves your device.
- Base64 Decode and EncodeDecode Base64 to readable text or encode text to Base64 as you type, with full support for accents and emoji (UTF-8) and the URL-safe variant. You can also turn a file into Base64 or save decoded Base64 as a file. Everything stays on your device.
- Hash GeneratorGet the MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hash of any text as you type, or the checksum of a file, and compare it with the one a download page lists. Your text and files never leave your device.
- HEX to RGB Color ConverterConvert a colour between HEX, RGB, HSL, HSV and CMYK in one step, including transparency. Paste a code in any format or pick a colour, then copy the format you need and check its text contrast.
- JSON VisualizerPaste or open a JSON file to explore it as a collapsible tree or as a graph of connected boxes. Search keys and values, copy the path to any field, and see exactly where invalid JSON breaks. Your JSON never leaves your device.
- JWT DecoderPaste a JSON Web Token to see its header and payload as readable JSON, with the issued, not-before and expiry times shown as dates and whether it has expired. The token is decoded on your device and never sent anywhere.
- Regex TesterTest a regular expression against your text and see every match highlighted as you type, with capture groups (named ones too) and a live replace preview. It follows JavaScript regex rules, and a pattern that runs too long is stopped instead of freezing the page.
- Unix Timestamp ConverterConvert a Unix timestamp to a readable date and time in any time zone, or turn a date into a timestamp. Paste a whole column to convert many at once. Seconds, milliseconds and microseconds are detected automatically, and the current epoch time ticks live at the top.
- URL Encode / DecodeEncode text for a URL or decode %20-style percent-encoding back to readable text, as you type. Paste a full link to see its query parameters listed and decoded. Nothing leaves your device.