Encoding

Generate barcode artwork for Code 128, EAN-13, UPC-A, or Code 39 with check-digit controls, quiet-zone checks, and print-fit guidance.

Encode or decode Base64 text and files in your browser, inspect recovered bytes, repair padding, and create URL-safe or Data URL output.

Convert binary, decimal, hex, octal, and Base36 integers with signed-width checks, bit fields, endian previews, and byte-level output.

Calculate fixed-width bitwise masks, shifts, rotations, flag tests, signed readouts, and bit-lane changes with binary and hex checks.

Practice Braille letters and digits with seeded drills, missed-answer review, repeatable sessions, score charts, and downloadable result files.

Decode a CSR locally, check SAN coverage and key strength, and review signature, fingerprints, expected-host matches, and readiness notes.

Decompress gzip, zlib, or raw deflate text in your browser from Base64, Base64URL, hex, escaped bytes, or local files with byte evidence.

Look up an HTML entity, symbol, name, or code point, then compare named, numeric, Unicode, and context-safe paste forms for markup or code.

Escape HTML snippets for text or attributes, decode nested entities in your browser, and review a transform ledger plus copy-safety warnings.

Decode escaped HTML text or small files in your browser, inspect each entity change, and flag unresolved references or script-shaped output.

Encode one image to Base64 or a Data URI, preview the result, and check optimization, SVG alternatives, and inline-delivery size tradeoffs.

Convert JWK or JWKS JSON into SPKI public or PKCS#8 private PEM, with local validation, thumbprints, and clear key-family checks.

Check JWT claims and headers for issuer, audience, time, algorithm, replay, and sensitive-data risks before relying on a token in an API.

Inspect a compact or Bearer JWT locally, read claims, and review timing, issuer, audience, signature, TTL, and sensitive-claim warnings.

Decode written Morse into readable text in your browser, catch separator or unknown-token problems, and create timing charts or practice audio.

Encode text or TXT files into Morse code with unknown-character checks, WPM and Farnsworth timing, playback, timeline charts, and WAV audio.

Practice Morse code recognition with letter, number, or mixed quizzes, then review missed patterns through seeded rounds, charts, and exports.

Convert Unicode domains and xn-- Punycode labels in your browser, with DNS length checks, script warnings, and copy-ready forms.

Decode a QR image in your browser, inspect the recovered payload, and catch URL, OTP, Wi-Fi, short-link, or private-host risks before opening.

Decode resistor color bands into ohms, tolerance limits, TCR drift estimates, and orientation checks for 4-, 5-, and 6-band parts.

Review SAML assertion timing from XML, SAMLResponse, or OAuth assertion captures with skew, bearer-expiry, replay-cache, and session evidence.

Review SAML metadata XML for import blockers, endpoint policy, entity roles, certificate dates, signature presence, and readiness evidence.

Decode SSL certificate text or files locally, inspect SAN names, dates, fingerprints, usage fields, and chain entries before deployment checks.

Encode or decode URL text by context, compare percent escapes and plus-as-space behavior, and catch round-trip problems before copying or opening.

Parse a URL or query string locally into components, query rows, masked sensitive values, length signals, and a rebuilt review URL before sharing.

Build a GA4 campaign URL from a landing page, keep or replace existing UTM tags, and catch missing fields, channel mismatches, and long links.

Look up a character, code point, grapheme, or escape with Unicode names, U+ values, UTF bytes, normalization checks, and hidden-text warnings.

Decode percent-encoded URLs or text, inspect query pairs and character bytes, remove common trackers, and preview JSON, Base64, or QR handoffs.

Encode URL text for components, full links, form values, or paths with character maps and query checks before copying or sharing.

Decode one UUID into canonical forms, verify version and variant bits, expose timestamps or node fields, and export bit-lane evidence and JSON.