Encoding

Convert local audio for playback or lossless storage with preservation-first profiles and verified codec, sample rate and channel output.

Create Code 128, EAN-13, UPC-A, or Code 39 barcode artwork with check-digit validation and print-readiness checks before export.

Encode or decode Base64 text and files locally, choose standard or URL-safe output, repair missing padding, and inspect the recovered bytes.

Convert one integer from binary or other common bases, then inspect Base36 output plus exact signed-width and bit-field interpretations.

Run fixed-width bitwise logic, shifts and flag changes with signed values plus binary, hexadecimal and lane-level checks across 2 to 256 bits.

Practice visual recognition of uncontracted Braille letters and literary digits with seeded rounds, instant feedback, and missed-item replay.

Decode a CSR in your browser, verify its self-signature and requested names, and flag key, digest, SAN, or hostname issues before submission.

Add Pinyin to Chinese text in your browser, review polyphonic readings, then choose how tones and syllable boundaries appear before export.

Convert Chinese text among Simplified, Standard Traditional and regional Taiwan or Hong Kong phrase profiles using version-pinned local data.

Convert an authorized TTF or OTF font to WOFF2 locally with checks for file size plus glyph, metric, table and variable-axis preservation.

Decompress gzip, zlib or raw deflate into readable text in your browser with wrapper checks, byte counts and strict encoding options.

Look up an HTML entity or Unicode value, then compare named and numeric forms with context-safe escapes for copying into markup and code.

Escape HTML for text or quoted attributes, decode nested character references locally, and flag unresolved, markup, or script-shaped output.

Decode escaped HTML text or small local files with multi-pass reference tracking plus strict review, Unicode normalization, and safety signals.

Turn an image into Base64 or a Data URI in your browser, preserve the original bytes or optimize the image, and judge whether inline use fits.

Convert one JWK or a selected JWKS key into SPKI public or PKCS#8 private PEM with local processing and auditable key fingerprints.

Check JWT headers and claims against issuer, audience, time, algorithm, replay, exposure, and token-profile rules without uploading the token.

Decode a compact or Bearer JWT locally and inspect readable claims with focused checks for timing, identity, lifetime and unverified signatures.

Decode written Morse locally into readable text, check unknown groups and separators, and hear practice audio with adjustable character and spacing speeds.

Encode text or TXT files as International Morse code with unsupported-character checks and Farnsworth timing, plus local playback and WAV output.

Practice visual International Morse letters and digits in seeded rounds with immediate corrections, pattern totals, and missed-symbol replay.

Decode PHP serialized data into a local typed tree with byte offsets, reference checks, and binary-safe display without object instantiation.

Convert Unicode hostnames and xn-- Punycode labels in your browser with DNS length checks, normalization choices and mixed-script warnings.

Decode a QR image locally, inspect the recovered payload, and flag suspicious links or sensitive OTP and Wi-Fi data before opening.

Decode resistor colors for 4- to 6-band parts and get resistance, tolerance limits, reading direction plus first-order temperature drift.

Check SAML assertion timing from XML or encoded captures, apply clock-skew and expiry rules, and separate bearer from replay and session evidence.

Review SAML metadata XML for import blockers across roles and endpoints with local checks for certificate dates, refresh validity and signature presence.

Decode X.509 certificate text or files locally and review validity, DNS coverage and key details alongside fingerprints and chain entries.

Practice sender-oriented A-Z semaphore recognition with reproducible rounds, pose-specific feedback, and focused replay of missed letters.

Re-encode a local text file as UTF-8, UTF-16, or Windows-1252 with BOM and line-ending controls plus recorded replacement details.

Encode or decode URL text by context, handle form-style plus signs and nested escapes, and check round-trip or double-encoding risks locally.

Parse a URL or query string locally, inspect components and duplicate parameters while masking token-like values for a safer review copy.

Build a campaign URL with consistent UTM tags while preserving useful query values and flagging naming, channel, or length issues.

Inspect a character or escape and compare its U+ value with UTF encodings and normalization forms while revealing invisible text and grapheme structure.

Decode percent-encoded URLs or text, inspect characters and query structure, and clean trackers or duplicate parameters without fetching the destination.

Encode URL components, complete links, form values, or paths with context-aware percent escapes, UTF-8 byte details, and local query checks.

Decode a UUID into canonical text and inspect its version, variant, bit fields and embedded time with checks for sentinel or legacy layouts.

Convert a local video to MP4 or WebM while preserving compatible streams and verifying its codecs, dimensions and playback before download.