JSON Formatter
Format, minify and validate JSON with useful syntax errors.
Developer toolsDeveloper tools
Local tools for formatting, encoding and verification.
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Base64 Encoder / Decoder
Encode Unicode text to Base64 or decode it back to text.
Developer toolsUUID Generator
Generate one or many cryptographically random UUID v4 identifiers.
Developer toolsUnix Timestamp Converter
Convert Unix seconds or milliseconds to dates in UTC and local time, or convert a date to Unix time.
Developer toolsURL Encoder / Decoder
Encode or decode one URL component with percent encoding.
Developer toolsHash Generator
Generate SHA-256, SHA-384 or SHA-512 hashes from text or files.
Developer toolsPassword Generator
Generate strong random passwords with the browser cryptography API.
Developer toolsJWT Decoder
Decode JWT headers and payloads locally without trusting the signature.
Developer toolsRegex Tester
Test JavaScript regular expressions in an isolated, time-limited worker.
Developer toolsCSV to JSON
Convert robustly parsed CSV data to JSON locally.
Developer toolsJSON to CSV
Convert an array of flat JSON objects to correctly escaped CSV.
Developer toolsInspect and transform data locally
Format JSON, convert Base64 and URL components, generate UUID v4 identifiers, convert Unix timestamps and calculate modern SHA-2 hashes. Native browser APIs keep these utilities lightweight.
Common uses
Validate an API payload, prepare a query value, compare a file checksum or translate an epoch time. The tools display explicit errors and keep source data inside the current page.
Developer tools: common questions
Are these tools safe for secrets?+
Processing is local, but avoid pasting secrets into any device or browser you do not trust.
Is Base64 encryption?+
No. Base64 is reversible encoding. Hashing is one-way but is also not encryption.
Which hash algorithms are available?+
SHA-256, SHA-384 and SHA-512 are provided through Web Crypto.