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
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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 →
Why use browser-based developer utilities?
Small formatting, encoding, validation, and conversion tasks should be easy to complete. These online developer tools keep the workflow short, explain the expected input, and make the result easy to copy or download.
For tools that support local processing, your input stays in the current browser session. Always read the notice shown on the individual tool page before using sensitive or production data.
Browse all developer tools or read the developer tool guides for practical examples.