Code and Web Tools
This is the browser-first developer shelf: tools for debugging, converting, testing, and shipping small web tasks without opening a heavier stack.
- Made for API work, front-end chores, payload cleanup, and quick validation.
- Strong fit for developers, technical marketers, and no-code builders.
- Focused on speed, readable output, and copy-ready results.
Featured picks in Code and Web Tools
Start with the higher-interest tools below, then browse the full category list if you need a narrower utility.
Base Converter
Convert numbers between any base from 2-36 including binary, octal, decimal, hex, and base-32. Handles large numbers with BigInt.
Base64 Decoder
Decode Base64 strings back into normal readable text.
Base64 Encoder
Convert plain text into Base64 for transport, tests, and quick payload work.
Binary / Hex Converter
Convert between binary, hexadecimal, decimal, and octal instantly. Includes bit length and ASCII lookup.
Caesar Cipher
Encode or decode text with any rotation from 1 to 25. Includes a one-click ROT13 preset.
chmod Calculator
Set Unix file permissions with checkboxes or octal input. Shows symbolic notation, binary, and the full chmod command.
Related topic hubs
These hubs collect nearby tools by job to be done instead of by internal category.
All Code and Web Tools apps
34 apps currently live in this category.
Base Converter
Convert numbers between any base from 2-36 including binary, octal, decimal, hex, and base-32. Handles large numbers with BigInt.
Base64 Decoder
Decode Base64 strings back into normal readable text.
Base64 Encoder
Convert plain text into Base64 for transport, tests, and quick payload work.
Binary / Hex Converter
Convert between binary, hexadecimal, decimal, and octal instantly. Includes bit length and ASCII lookup.
Caesar Cipher
Encode or decode text with any rotation from 1 to 25. Includes a one-click ROT13 preset.
chmod Calculator
Set Unix file permissions with checkboxes or octal input. Shows symbolic notation, binary, and the full chmod command.
CRON Expression Builder
Build and explain CRON expressions field by field with plain-English descriptions and common presets.
CSS Clamp Generator
Generate fluid CSS clamp() values from viewport breakpoints and size targets with live preview and copy-ready code.
CSS Specificity Calculator
Calculate the (A, B, C) specificity score of any CSS selector. Compare multiple selectors side by side with a visual bar.
CSV Column Extractor
Pull one column out of simple CSV data for quick reuse.
CSV ↔ JSON Converter
Convert CSV to JSON and JSON to CSV instantly. Supports custom delimiters and header row detection.
Encrypt / Decrypt
Encrypt messages with a passphrase using AES-256. Everything runs in your browser — nothing leaves your device.
Hash Generator
Generate SHA-256, SHA-512, SHA-1, and SHA-384 hashes from any text instantly in your browser.
HTML Live Preview
Write HTML and see it rendered live side by side. Includes templates, tab support, download, and fullscreen preview.
HTML Minifier
Strip whitespace and comments from HTML instantly. See the byte savings before copying.
HTTP Status Codes
Searchable reference for all HTTP 1xx–5xx status codes with descriptions, causes, and fix notes for every code.
Image to Data URL
Convert any image (PNG, JPEG, GIF, WebP, SVG) to a Base64 data URL in your browser. Output as CSS, HTML img, or raw Base64.
JSON Formatter
Format, beautify, and validate JSON instantly with syntax highlighting. Minify or pretty-print with one click.
JSON ↔ YAML Converter
Paste JSON and get YAML back, or the other way around. Instant conversion with clean formatting.
JWT Decoder
Decode and inspect JSON Web Tokens instantly. See header, payload, expiration status, and standard claims. Runs locally.
Millisecond Converter
Convert milliseconds to seconds, minutes, hours, and human-readable strings. Useful for debug timings and benchmarks.
Quote Escaper
Escape quotes and backslashes for easy JSON and code pasting.
Regex Tester
Test regular expressions in real time with live match highlighting, group captures, and a replace preview.
Robots.txt Builder
Build a clean robots.txt file with path rules, sitemap lines, crawl delay, and optional AI crawler blocking.
SQL Pretty Printer
Paste messy SQL and get it formatted, indented, and syntax-highlighted instantly.
SVG to Data URL Converter
Paste raw SVG markup and turn it into a URL-encoded data URL plus a copy-ready CSS background-image line.
Tab ↔ Space Converter
Convert between tabs and spaces with configurable tab width. Paste code, pick direction, and copy the result.
Timestamp Converter
Convert Unix timestamps to readable dates and vice versa. Supports both seconds and milliseconds.
Token Usage Calculator
Estimate LLM token counts and API costs for Claude, GPT-4o, and Gemini from any pasted text.
URL Decoder
Turn encoded URL text back into readable plain strings.
URL Encoder
Encode text into URL-safe form for query strings and path segments.
UUID Generator
Generate UUID v4 or v7 values in batches with uppercase, braced, and hyphenless output options.
Vigenère Cipher
Encode or decode text with a keyword using the Vigenère cipher. See the repeating key pattern below the output.
Whitespace Visualizer
Make spaces, tabs, and line breaks visible when pasted text gets weird.