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Developer Tools
Tools that streamline development and debugging - JSON formatting, Base64 conversion, UUID generation. No installation needed, just open your browser.
About this category
The developer tools handle JSON formatting, Base64 conversion, UUID generation and more right in your browser. No installation, no command line - just open a page and work. Your code and data are never sent anywhere.
JSON Formatter
Format, minify, validate and unescape JSON right in your browser.
Base64 Converter
Encode or decode text, images and files to and from Base64.
UUID Generator
Generate UUIDs (v4) in bulk for free. Handy for API development and test data.
Unix Timestamp Converter
Convert between Unix timestamps and dates. Grab the current timestamp with one click.
CSV to JSON Converter
Convert between CSV and JSON. Supports comma, tab and semicolon delimiters with optional header rows.
Number Base Converter
Convert between binary, octal, decimal and hexadecimal. Handles arbitrarily large integers with exact precision and readable digit grouping.
URL Encoder / Decoder
Encode text into URL (percent) encoding and decode it back. Handy for building Japanese URLs and query parameters or inspecting encoded strings.
Hash Generator
Compute SHA-1, SHA-256, SHA-384 or SHA-512 hashes of text or files in your browser. Handy for verifying file integrity and downloads.
Regex Tester
Test a regex pattern against any text and instantly see matches highlighted. Supports flags (g/i/m/s/u) and match details.
Text Diff / Compare
Compare two texts in your browser. See line-by-line additions and deletions side by side, with instant stats on what changed.
Related articles
GuideBinary, Decimal and Hex Conversion: Worked Examples and Signed Values
Convert 42 to binary 101010 and hex 2A, use a four-bit lookup table, and see when FF means 255 or −1. Check large integers and distinguish hex from UTF-8.
GuideUnix Timestamp to Date: Seconds, Milliseconds, UTC and Local Time
Convert 10- and 13-digit timestamps, identify 12-digit and negative values, and check UTC, local time, reverse conversion and the signed 32-bit limit.
GuideUUID v4 vs v7: How to Choose, Generate and Store UUIDs
Read the 36-character UUID layout, compare v4, v7 and v1, estimate collisions, and verify unique constraints. Try batch generation of up to 1,000 v4 IDs.
FAQ
Is it safe to handle sensitive data?
Yes. All processing happens in your browser and data is never sent to a server.
Do I need to install anything?
No. Just open the page in your browser - no installation or registration required.