Dev Tools

Free online tools

Lightweight, fast tools that run client-side in your browser where possible.

JSON Formatter & Validator
Format, validate, and prettify JSON in your browser. Fast and free.
Password Generator
Generate strong passwords locally in your browser.
Base64 Encoder/Decoder
Encode and decode Base64 strings quickly.
Subnet Calculator
Calculate subnets, masks, and ranges.
JWT Decoder
Decode JWT header and payload locally.
Hash Generator
Generate MD5/SHA256/SHA512 hashes in-browser.
DNS Lookup
Lookup DNS records for a domain.
URL Encoder/Decoder
Encode/decode URL components safely.
SSL Certificate Checker
Check certificate details for a domain.
Regex Tester
Test regex patterns with live matches.
UUID Generator
Generate UUIDv4 locally in your browser.
Lorem Ipsum Generator
Generate placeholder text paragraphs quickly.
Timestamp Converter
Convert Unix timestamps to dates and back.
Color Converter
Convert HEX/RGB/HSL and copy values.
URL Parser
Parse a URL into its components and query params.
Querystring ↔ JSON
Convert querystrings to JSON and back.
Text Counter
Count words, characters, and lines instantly.
Markdown Preview
Preview Markdown locally (safe subset).
Diff Checker
Compare two texts and highlight differences.
HTML Entities Encoder/Decoder
Encode/decode HTML entities in-browser.
Case Converter
Convert text case (snake, camel, kebab, etc.).
JSON → CSV
Convert JSON arrays to CSV locally.
Audio Converter (WASM)
Convert audio formats client-side using WebAssembly.
Video Converter (WASM)
Convert video formats client-side using WebAssembly.
QR Code Generator
Generate QR codes and download PNG/SVG.
Image Compressor
Compress images client-side (JPEG/WebP/PNG).
CSV → JSON
Convert CSV to JSON locally in your browser.
Base Converter
Convert between binary, decimal, and hex.
HTML Minifier (basic)
Minify HTML quickly in your browser.
Slug Generator
Convert text into a clean URL slug.
Whitespace Cleaner
Trim, collapse whitespace, and remove empty lines.
Line Sorter
Sort lines, unique lines, and cleanup.
Text Reverser
Reverse text, words, or lines.
Find & Replace
Bulk find and replace text (optional regex).
Word Frequency Counter
Count word occurrences and sort by frequency.
Remove Duplicate Lines
Remove duplicate lines (preserve first occurrence).
Unicode Normalizer
Normalize text (NFC/NFD/NFKC/NFKD).
Diacritics Remover
Remove accents/diacritics from text.
Emoji Remover
Remove emoji characters from text.
Line Joiner/Splitter
Join lines with a delimiter or split text into lines.
Unicode Escape/Unescape
Escape/unescape Unicode sequences like \uXXXX.
ROT13
Apply ROT13 transform to text.
Hex Encoder/Decoder
Encode/decode text to/from hex (UTF-8).
Binary Encoder/Decoder
Encode/decode UTF-8 text to/from binary.
JSON Minifier
Minify JSON by removing whitespace.
JSON Sort Keys
Recursively sort JSON object keys for stable diffs.
JSONL Viewer
View/validate JSON Lines (NDJSON) and inspect records.
JSON Path Tester
Extract a value using a simple dot/bracket path.
TSV ↔ CSV
Convert TSV to CSV and CSV to TSV.
CSV Delimiter Detector
Detect likely delimiter for a CSV snippet.
Data URL ↔ File
Convert text/files to Data URLs and decode them.
Random Bytes Generator
Generate secure random bytes (hex/base64).
HMAC Generator
Generate HMAC (SHA-256/512) using WebCrypto.
PBKDF2 Generator
Derive keys with PBKDF2 (WebCrypto).
File Hash (SHA-256)
Hash a file locally in your browser.
HTTP Status Codes
Lookup HTTP status codes and meanings.
MIME Type Lookup
Lookup common MIME types by extension.
robots.txt Generator
Generate a robots.txt file quickly.
sitemap.xml Generator
Generate a sitemap.xml for a list of URLs.

Tip: Bookmark tools you use often. No accounts. No tracking required for tool usage.