Developer Tools

Q: Do I need the JSON formatter or the JWT decoder?

Use the JSON formatter to indent, minify or validate JSON. Use the JWT decoder for a complete dot-separated token: it reads the header and payload without verifying the signature. To compare two versions of a document, use the text comparison tool instead.

Q: What is the difference between timestamps and Cron schedules?

A Unix timestamp identifies an instant; Cron describes a recurring schedule. Convert seconds or milliseconds with the timestamp converter, inspect an existing expression with the Cron parser, or build one with the generator. Set the preview time zone to match your actual scheduler.

Q: Are my files, tokens or text uploaded?

No. These tools process your input in your browser. The website serves the page and its code, but your input is not sent to a conversion server or saved in an account.

Encode files and text, inspect JSON and tokens, compare changes, calculate checksums and work with timestamps and schedules.

Common tasks and examples

Cron Every 5 Minutes
Build a five-minute cron schedule and check its next execution times.
Base64 Decoder
Decode Base64 to readable UTF-8 text, or download the original bytes.
JSON Minifier
Compact JSON to one line while keeping string contents and exact numbers.

Explore all developer tools

Encoding & Files

Move between text, bytes, URLs and embedded images without changing your original data.

Base64 Encoder & Decoder

Encode UTF-8 text to Base64 or decode standard and URL-safe Base64. Control padding and line wrapping.

Base64URL Encoder & Decoder

Convert text to URL-safe Base64 with the - and _ alphabet. Encode or decode unpadded Base64URL strings.

Image to Base64

Convert PNG, JPEG, GIF, WebP, SVG and other recognised image files to Base64 Data URIs in your browser.

Base64 to Image

Decode a Base64 image or Data URI, preview supported image types and download the original image bytes.

File to Base64

Encode any file to a Base64 string, with optional Data URI prefix, padding and MIME line wrapping.

Base64 to File

Turn Base64 strings and Data URIs back into downloadable files without changing the decoded binary data.

URL Encoder & Decoder

Encode and decode URL components, complete URLs and form values. Handle percent escapes and spaces correctly.

HTML Entity Encoder & Decoder

Convert text and Unicode characters to HTML entities, or decode named and numeric HTML character references.

Unicode Inspector & Escape Converter

Inspect Unicode code points, UTF-8 bytes and UTF-16 units, or convert JavaScript Unicode escapes to readable text.

Data & Text Inspection

Read structured data, inspect tokens and understand exactly what changed.

JSON Formatter, Minifier & Validator

Format, minify and validate JSON with exact large-number preservation, indentation options and recursive key sorting.

JWT Decoder

Read JWT headers and payloads, inspect expiry and activation times, and view claims without sending your token anywhere.

Text Diff Checker

Compare two texts by line, word or character. Highlight additions and removals while retaining spaces and line breaks.

Regular Expression Tester

Test JavaScript regular expressions with flags, match positions, capture groups and named groups in your browser.

Hashes, IDs & Schedules

Check file integrity, generate identifiers and make sense of times and recurring schedules.

MD5 Hash & File Checksum

Calculate an MD5 hash for text or a local file, and compare it with an expected checksum.

SHA-1 Hash & File Checksum

Calculate SHA-1 hashes for UTF-8 text or files and compare the result with an expected checksum.

SHA-256 Hash & File Checksum

Generate SHA-256 hashes for text or files and check a downloaded file against its published checksum.

SHA-512 Hash & File Checksum

Calculate SHA-512 text and file hashes locally and compare full hexadecimal checksums.

CRC32 Checksum Calculator

Calculate standard CRC-32 checksums for text or files and compare eight-character hexadecimal results.

HMAC Generator

Generate HMAC-SHA-1, HMAC-SHA-256 and HMAC-SHA-512 with a UTF-8 or hexadecimal secret key.

UUID & GUID Generator

Generate random UUID v4 or time-ordered UUID v7 identifiers, individually or in batches.

Unix Timestamp Converter

Convert Unix seconds, milliseconds and ISO 8601 dates. View the same instant in UTC and any IANA time zone.

Cron Expression Parser

Validate five- or six-field Cron expressions and list upcoming runs in an IANA time zone, including daylight-saving changes.

Cron Expression Generator

Build a Cron expression from time fields or common presets, then preview its next scheduled times in your chosen zone.

Questions about Developer Tools

Should I use Base64, URL encoding or HTML entities?

Use Base64 to represent file bytes as text, URL encoding for URL components, and HTML entities for characters such as < or & in HTML text. They are not interchangeable. Base64URL is a URL-safe Base64 alphabet, not percent encoding; none of these methods encrypts your data.

Do I need the JSON formatter or the JWT decoder?

Use the JSON formatter to indent, minify or validate JSON. Use the JWT decoder for a complete dot-separated token: it reads the header and payload without verifying the signature. To compare two versions of a document, use the text comparison tool instead.

What is the difference between timestamps and Cron schedules?

A Unix timestamp identifies an instant; Cron describes a recurring schedule. Convert seconds or milliseconds with the timestamp converter, inspect an existing expression with the Cron parser, or build one with the generator. Set the preview time zone to match your actual scheduler.

Are my files, tokens or text uploaded?

No. These tools process your input in your browser. The website serves the page and its code, but your input is not sent to a conversion server or saved in an account.

Your input and files are processed on your device. Keep sensitive results out of shared clipboards and use a trusted device for private keys and tokens.