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Merge, split, convert, sign and organize your documents.
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Compress, resize, convert and remove image metadata.
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Prepare product images and build campaign tracking links.
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Count words, change text case and convert CSV or JSON.
IT & Developer tools
Local tools for crypto, data conversion, web, IPv4 networks and text.
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Trim, convert and compress video on your device.
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All tools in this category
Format JSON
Validate, format, minify and sort JSON keys.
Base64
Encode or decode Unicode text with Base64.
Password generator
Generate passwords with your chosen length and character sets.
URL encode / decode
Encode Unicode text as a URL component or decode percent escapes.
UUID v4 generator
Generate random UUID v4 identifiers individually or in batches.
SHA-256 hash
Calculate a SHA-256 checksum from UTF-8 text or a local file.
JWT reader
Inspect JWT header and payload locally, without verifying its signature.
Regex tester
Test JavaScript regular expressions and inspect match positions and groups.
Compare code / text
Find added, removed and unchanged lines between two versions of text.
Unix timestamp converter
Convert Unix timestamps to dates or ISO dates to seconds and milliseconds.
Number base converter
Number base converter with local processing, input validation and downloadable results.
URL parser
URL parser with local processing, input validation and downloadable results.
IPv4 subnet calculator
IPv4 subnet calculator with local processing, input validation and downloadable results.
HEX / RGB / HSL
HEX / RGB / HSL with local processing, input validation and downloadable results.
Roman numeral converter
Roman numeral converter with local processing, input validation and downloadable results.
URL slug generator
URL slug generator with local processing, input validation and downloadable results.
Text case converter
Text case converter with local processing, input validation and downloadable results.
Sort / deduplicate lines
Sort / deduplicate lines with local processing, input validation and downloadable results.
Random token generator
Random token generator with local processing, input validation and downloadable results.
HMAC-SHA256 generator
HMAC-SHA256 generator with local processing, input validation and downloadable results.
Text / binary converter
Text / binary converter with local processing, input validation and downloadable results.
JSON minifier
JSON minifier with local processing, input validation and downloadable results.
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JWT reader
Inspect JWT header and payload locally, without verifying its signature.
Input
Reads the header and payload of a three-part JWT; encrypted JWE is not supported. Displayed claims are untrusted. Up to 32,000 characters.
JWT reader — What this tool does
Inspect JWT header and payload locally, without verifying its signature.
- Input and output
- JWT → JSON
How to use it
- Paste your input or use the example. Choose the input format before running.
- Adjust the available settings to suit the result you need. Your choices apply when you run the tool.
- Run the tool, review the result and any warnings, then download or copy the output. Larger files may take longer on your device.
Limits and output quality
Reads the header and payload of a three-part JWT; encrypted JWE is not supported. Displayed claims are untrusted. Up to 32,000 characters.
NOT VERIFIED — decoding does not validate the signature, issuer, permissions or token validity.
Frequently asked questions
What result will I get?
JSON. Inspect JWT header and payload locally, without verifying its signature.
Are my files uploaded to a server?
Files and text are processed in this browser tab, without server uploads or analytics. Language and theme preferences are saved on this device. Closing the tab releases the working files. On the first visit, the site uses the hosting provider’s approximate IP country when available, then your browser language. A language cookie remembers your choice for one year. You can change it at any time.
Will this change my original file?
No. The tool creates a separate result for you to review and download. Keep the original until you have checked the exported content.
Enter input to begin.
Enter input to begin.