ToolHub — Free Online Developer Tools

Free online developer tools — JSON formatter, regex tester, hash generator, UUID, QR code, color converter and more. All run in your browser.

• Base64 Encoder / DecoderEncode text or files as base64 or hex — decode base64 to text, hex bytes or a file.
• String Case ConverterConvert text between camelCase, snake_case, kebab-case and more.
• Hash GeneratorGenerate MD5, CRC32, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC hashes.
• JSON DiffCompare two JSON documents side by side with a line-level diff.
• JSON FormatterFormat, validate and compress JSON with error locations.
• JSONPath QueryQuery JSON documents with JSONPath expressions and see every match.
• JWT DecoderDecode JWT header and payload without sending the token anywhere.
• Password GeneratorGenerate strong random passwords with a strength estimate.
• Regex TesterTest regular expressions with live match highlighting.
• Timestamp ConverterConvert between Unix timestamps and readable dates with custom formatting.
• URL Encoder / DecoderPercent-encode or decode URL components.
• UUID GeneratorGenerate v4 UUIDs — one or a batch, any casing.
• Barcode GeneratorGenerate CODE128, EAN, UPC and other barcodes.
• Color ConverterConvert between HEX, RGB and HSL with a live preview.
• Dice RollerRoll any number of dice from d4 to d100.
• IP LookupLook up your IP address and its location, ISP and ASN.
• Lorem Ipsum GeneratorGenerate lorem ipsum placeholder text for mockups.
• MAC Address GeneratorGenerate random MAC addresses in several formats.
• QR Code GeneratorGenerate QR codes from text or URLs — with custom styles, eyes, colors and logos.
• Random Number GeneratorGenerate random numbers in any range, with optional uniqueness.

All tools run entirely in your browser — no sign-up, no upload.