22 available • 0 coming soon
Converters and encoders are the kind of tools you reach for ten times a day during development or technical work. Encode a binary file to Base64 for embedding, decode a JWT to inspect its claims, generate a SHA-256 hash to verify a download, or convert a Unix timestamp into something humans can read. The collection also includes less common utilities like Punycode conversion for internationalized domains, Morse code translation, and font format conversion between TTF, WOFF, and WOFF2.
These tools frequently handle sensitive inputs: API keys pasted into a Base64 decoder, passwords fed to a hash generator, tokens being inspected in a JWT viewer. Running conversions locally guarantees that none of those values are logged or transmitted. Speed matters here too - conversions happen in microseconds with no network overhead, so the result appears as you type.
Generate linear barcodes with the quiet zone each standard requires, and read the bars back to check they are right
Encode and decode text, files and JSON as base64, base64url or hex, checked by decoding the result back
Hash files with MD5, SHA-1, SHA-2 and CRC, and verify them against a published digest or a whole checksum file
Convert between ten colour notations including Lab and OKLCH, check WCAG contrast, and simulate colour vision deficiency
Build a colour harmony that holds its lightness by rotating hue in OKLCH, with the contrast of every pair, a perceptually even tint and shade ramp, and what a colour blind reader sees
Convert between 30+ world currencies using live exchange rates from a public API
Encrypt a file with a password using AES-256-GCM, in a documented format that records everything needed to open it again, and read it back a megabyte at a time
Convert fonts between TTF, OTF, WOFF, and WOFF2 formats. Preview fonts with custom text, view font details, and generate CSS @font-face code.
MD5, SHA-1, SHA-2 and CRC digests of text or a file, with HMAC and verification against a published digest
Sign a JSON Web Token with HS, RS, PS or ES, generate a key pair, and check the result against the verifier
Decode a JSON Web Token and, given the secret or public key, actually verify its signature. Refuses alg: none and algorithm confusion
Convert text to Morse code and back against the ITU-R M.1677-1 table, and play it with the timing the Recommendation specifies
Spell text out in the radiotelephony alphabet of ICAO Annex 10 Volume II, with the Alfa and Juliett spellings the Recommendation actually gives, and read a spelled message back
Exact conversion between any bases on BigInt, with fixed-width integer views, bitwise algebra and IEEE-754
Convert a domain between Unicode and its xn-- form, both ways at once, with the length, validity and lookalike checks that decide whether it resolves
Generate QR codes and check each one scans by decoding it back before you download it
Turn a title into a URL slug in seven formats, with diacritics folded by NFD, Greek and Cyrillic romanised, every character accounted for, and collisions reported
Convert times through the real IANA rules, flagging local times that happen twice and ones that never happen
Convert across 18 categories using exact defining factors, with the definition behind every number shown
Convert between Unix timestamps and dates in any of 400+ time zones, in seconds, milliseconds, microseconds or nanoseconds
Percent-encode and decode against four character sets, build query strings, and take a URL apart
Generate UUID v1, v3, v4, v5, v6 and v7, ULID, NanoID, CUID2 and Snowflake IDs, and read any of them back
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