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Format, validate, convert, and inspect JSON in the browser.

Base64, URL encode/decode, and text encoding utilities.

JWT decode, UUID generation, and everyday engineering helpers.

SHA digests and checksum helpers that run entirely client-side.

Encode and decode Base64 for text, JSON, HTML, and URL-safe payloads in your browser — private, no upload.

Generate hashes and identifiers (SHA, UUID) locally for checksums, tokens, and IDs.

Format, beautify, and minify JSON in your browser. Free, private, and instant — no upload to a server.

Validate JSON instantly in your browser. See type, size, and node counts — or exact parse errors with line and column.

Explore JSON as an interactive tree with paths, types, and expandable nodes — all processed locally in your browser.

Compare two JSON documents structurally. Find added, removed, changed, and type-changed paths — privately in your browser.

Generate a unified diff of two JSON documents after pretty-printing. Ideal for reading line-level changes quickly.

Escape text into a JSON string literal, or unescape a JSON string back to raw text — instantly and offline.

Encode UTF-8 text to Base64 or decode Base64 back to text — instantly in your browser.

Percent-encode text for URLs or decode encoded query strings — private and instant.

Decode JWT header and payload in your browser — inspect claims without uploading tokens.

Generate UUID v4 identifiers in bulk — uppercase and hyphenless options, fully client-side.

Generate SHA-1 / SHA-256 / SHA-384 / SHA-512 digests of text with Web Crypto — fully client-side.

Encode plain text notes, messages, and Unicode strings to Base64 in your browser — private and instant.

Encode JSON payloads to Base64 for APIs, JWTs, and transport — decode back to UTF-8 JSON in your browser.

Encode HTML fragments and markup to Base64 for data URLs, emails, and embeds — decode back in your browser.

Encode URLs and query strings to Base64 for opaque links and redirects — distinct from percent-encoding.

Format messy API JSON into readable indented output, or minify for transport — privately in your browser with Tools by RS Roshi.

Inspect JWT header and payload in your browser. Learn why decoding is not verification, and which claims matter when debugging auth.

Learn when to Base64-encode text or JSON, how that differs from URL percent-encoding, and why Base64 is not encryption.

Common keyboard shortcuts for Tools by RS Roshi workspaces — format, copy, reset, and global search.

How Tools by RS Roshi handles data: browser-first processing, what we do not upload, and how that claim maps to product behavior.

Architecture overview for Tools by RS Roshi: registry-driven pages, lazy panels, SEO content, and client processors.