AZ Tools

Paste a feed and read it: entries, dates normalised, podcast enclosures, and the problems that make readers drop or duplicate posts.

Paste any DER structure — PEM, base64 or hex — and see its ASN.1 tree: offsets, tags, lengths and decoded values.

Paste base64 or hex MessagePack bytes and read the values — types, nested maps, binary blobs and timestamps — decoded in your browser.

Open an Apple property list — binary or XML — and read it as a tree, or convert it to JSON or XML plist.

Turn a JWK or a whole JWKS into PEM public keys and back, with the RFC 7638 thumbprint for each — computed in your browser.

Drop an MP3 and read its ID3 tags, bitrate and duration, and pull out the embedded cover art — all in your browser.

Paste base64 or hex protobuf bytes and read the fields — numbers, wire types, nested messages, strings and packed arrays — without a schema.

Paste a PEM certificate and read it: subject, issuer, expiry, SANs, key, fingerprints and extensions — decoded in your browser.

Open an .epub in your browser: metadata, chapter list with word counts, the plain text, and the structure checks that explain why a reader rejects a book.

Open an .ics invite or calendar export and read what is actually in it — every field, plus the real dates a repeating rule produces.

Turn CSV or TSV into a real .xlsx file in your browser, with leading zeros, long IDs and codes like SEPT1 kept exactly as typed.

Open an .xlsx workbook in the browser and export any sheet as CSV, JSON or a Markdown table — the file never leaves your device.