Tools for encoding and decoding common web data formats: URL percent-encoding, Base64, Data URIs, and more. Useful for debugging APIs, embedding images as data URIs, and understanding how your data is transformed in transit.
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Calculate the estimated Base64-encoded size of any file. Shows original size, encoded size, and overhead.
Convert text or files to and from Base64. Supports URL-safe Base64 encoding.
Decode percent-encoded URLs to readable text. Supports full URLs and individual components.
Parse data URLs to extract MIME type, encoding, and raw data content.
Encode or decode URLs using percent-encoding. Supports international characters.
Paste a Base64 data URL to preview the image in your browser and download it as PNG or JPG.
Decode Base64 encoded strings to plain text instantly. Supports standard and URL-safe Base64.
Without UTM parameters, your analytics just shows "Direct." Learn all five UTM parameters, build properly tagged campaign URLs, and find your results in GA4's Traffic Acquisition report — with real examples.
A practical breakdown of JWT structure — header, payload, signature. Covers the full auth flow, how signature verification works, where to store tokens, and JWT vs session cookies.
Understand percent-encoding from scratch. Learn which characters need encoding, the difference between encodeURI and encodeURIComponent, and how to handle encoded URLs in fetch and form submissions.
A clear explanation of cryptographic hashing. Covers MD5, SHA-1, SHA-256 and SHA-512 compared, why passwords are hashed not encrypted, and what hash collisions mean in practice.
A practical guide to generating QR codes. Covers linking to URLs, business cards, menus, and events — plus error correction levels, minimum print sizes, and whether to use short URLs.
A beginner-friendly guide to Base64 encoding. Learn how it works, common use cases like embedding images in HTML, sending binary data in APIs, and how to decode Base64 strings.
URL encoding replaces unsafe characters in URLs with % sequences. Base64 converts binary data to printable ASCII text. Try the URL Encoder and Base64 Encoder side by side to see when each is appropriate.