Online Encoders & Decoders for Developers
Encode and decode Base64, URLs, HTML entities, certificates, QR codes, and more in your browser. Each tool is focused on one common development task and is available without an account.
Encoders & Decoders
8 toolsChoose a tool
Base64 Image Encoder & DecoderConvert images to Base64 or Data URLs and decode them back in your browser.Open tool →Base64 Encoder & DecoderEncode UTF-8 text to Base64 or decode Base64 and Base64URL strings online for free.Open tool →Certificate ParserInspect PEM, DER, PFX, and PKCS#12 certificates and certificate chains locally.Open tool →Gzip Compressor & DecompressorCompress and decompress text, files, and Base64 Gzip data directly in your browser.Open tool →HTML Entity Encoder & DecoderEncode special characters as HTML entities or decode HTML entity text online.Open tool →JWT Decoder, Generator & VerifierDecode JWT headers and claims, verify signatures, or generate JSON Web Tokens in your browser.Open tool →QR Code Generator & ScannerGenerate QR codes or scan a QR image with upload, paste, or camera support.Open tool →URL Encoder & DecoderEncode or decode URL components and complete URIs online with clear validation.Open tool →
Encoding is about representation, not secrecy
These tools convert text, images, certificates, tokens, and special characters between formats used by browsers and APIs. The receiving protocol determines which alphabet, padding, character set, and escaping rules are correct.
Keep the target context in view
Base64, URL encoding, HTML entities, and JWT segments look similar in places but solve different problems. Check the output with the target parser and never treat an encoded value as encrypted.
- Choose Base64URL when the receiving token or URL format requires it.
- Use HTML and URL encoders only for their matching output context.
- Inspect certificate and JWT details locally and keep keys out of shared workflows.
Browse all developer tools or read the developer tool guides for practical examples.