Developer tools

Encode, decode, format and hash. 17 free tools, any file size, no account.

The small jobs that interrupt real work: decoding a JWT to see what is in it, formatting a JSON blob so it can be read, hashing a string, testing a regex against a sample, generating a password or a UUID. Nothing here needs a paste into someone else's server.

Password GeneratorStrong random passwords made on your own device.Image to Base64Convert an image into a Base64 data string.JSON FormatterBeautify, minify and validate pasted JSON Regex TesterTest patterns with highlighted matches and capture groups UUID GeneratorGenerate one or many cryptographically random UUID v4 values Hash GeneratorHash text or files with MD5 and the SHA family JWT DecoderRead what is inside a token.URL Encoder and DecoderPercent encoding, both directions.Base64 Encoder and DecoderBase64 both ways, text or file.Data Format ConverterJSON, YAML, CSV, TOML and JSONL, any direction YAML to JSONYAML in, JSON out, without leaving the page.CSV to JSONCSV in, JSON out, with the delimiter in your hands.TOML to JSONTOML in, JSON out, with the failing line named.Diff CheckerCompare two texts and see exactly what changed Luhn ValidatorCheck a card number checksum and name the issuer UTM BuilderTag a link so the report knows where it came from.Meta Pixel Code GeneratorBase code and events from a dataset ID.

Frequently asked questions

Is it safe to paste a token or a key in?

It never leaves your device. The JWT decoder, the hash generator and the formatters all run in the page, so a token you decode here is not transmitted or logged anywhere.

Where are the generated passwords kept?

Nowhere. Between eight and sixty-four characters, up to twenty at a time, made in your browser tab. They are not saved, not sent and not recoverable once the tab is closed.

Does the JWT decoder verify the signature?

It decodes and shows the header, payload and claims so you can read them. Verifying a signature needs the secret or key, which belongs on your server, not in a web page.

The same tools under other names: URL Decoder · Base64 Decode · JSON to YAML · JSON to CSV · MD5 Generator · SHA-256 Generator · Checksum Calculator · JSON Beautifier · JSON Minifier · JSON Validator · GUID Generator · Base64 Encode · URL Encoder · JWT Parser · Text Compare · Text Diff · Credit Card Validator · Random Password Generator · Facebook Pixel Code Generator · Meta Pixel Generator

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