Free Developer Tools
Everyday tools for developers: format JSON, SQL and XML, test regex, decode JWTs, encode Base64 and URLs, generate hashes and UUIDs, and convert CSV, YAML and Excel.
Network and web tools too: share files device-to-device on your Wi-Fi, scrape tables and links from a web page, check HTTP headers, look up DNS records and test WebSockets.
55 free tools · no sign-up · works on mobile
JSON Formatter
Format, validate and minify JSON.
Password Generator
Generate strong, random passwords.
Base64 Encoder / Decoder
Encode text to Base64 or decode it back.
URL Encoder / Decoder
Encode or decode URLs and see every query parameter.
JWT Decoder
Decode JSON Web Tokens and check expiry times.
UUID Generator
Generate random UUID v4 or time-ordered v7 in bulk.
Hash Generator
MD5, SHA-1, SHA-256 and SHA-512 for text or files.
Unix Timestamp Converter
Convert epoch timestamps to dates and back.
Regex Tester
Test regular expressions with live highlighting and groups.
Color Converter
Convert HEX, RGB, HSL and CMYK and check contrast.
CSV to JSON Converter
Convert CSV to JSON and JSON to CSV.
Markdown to HTML
Convert Markdown to HTML with a live preview.
CSS & JS Minifier
Minify CSS and JavaScript to load pages faster.
XML Formatter
Beautify, validate or minify XML.
SQL Formatter
Format SQL queries for any database.
YAML ⇄ JSON Converter
Convert YAML to JSON and back.
JSON to TypeScript
Generate TypeScript interfaces from JSON.
HTML Entity Encoder
Escape and unescape HTML entities.
Number Base Converter
Binary, octal, decimal, hex and any base.
Cron Expression Explainer
Cron schedules in plain English with next runs.
IP Subnet Calculator
Network, mask, broadcast and host range.
Chmod Calculator
Linux file permissions as numbers and rwx.
CSS Gradient Generator
Linear, radial and conic gradients with preview.
Box Shadow Generator
Design CSS box shadows visually.
Meta Tag Generator
SEO, Open Graph and Twitter tags with previews.
Robots.txt Generator
Create robots.txt and block AI crawlers.
User Agent Parser
See your browser, OS and device from the user agent.
Password Strength Checker
How strong is your password?
Colour Contrast Checker
Check text colours against WCAG AA and AAA.
URL Slug Generator
Turn titles into SEO-friendly URL slugs.
HTML to Markdown
Convert HTML into clean Markdown.
CSV to Excel
Convert CSV data to a proper .xlsx file.
Excel to CSV & JSON
Convert Excel sheets to CSV or JSON.
Local File Share
Send files between nearby devices, LocalSend-style, in your browser.
Web Scraper
Extract tables, links and data from a web page to Excel.
HTTP Header Checker
Response headers, redirect chain and security headers.
DNS Lookup
A, MX, TXT, CNAME, NS and other DNS records.
What Is My IP
Your public IP address, location and browser details.
WebSocket Tester
Connect to a WebSocket server and send messages.
JSON Viewer
Explore JSON as a collapsible tree and copy paths.
JSON Diff
Compare two JSON documents, key order ignored.
JSON to CSV / Excel
Convert JSON (even nested) to CSV or Excel.
cURL to Code
Convert cURL to fetch, axios, Python, PHP or Go.
Image to Base64
Images to data URIs, and Base64 back to images.
Code Beautifier
Format JS, TS, HTML, CSS, JSON, YAML with Prettier.
PX to REM & clamp()
Convert px and rem; generate fluid clamp() CSS.
Flexbox & Grid Generator
Build flex and grid layouts visually; copy CSS.
Fake Data Generator
Indian test data as JSON, CSV, Excel or SQL.
JWT Generator
Sign JWTs with HS256/384/512 or verify a signature.
Bcrypt Generator
Hash passwords with bcrypt or check a hash.
AES Encryption
Encrypt and decrypt text with a password (AES-256).
TOTP Generator
2FA codes and authenticator QR for testing.
.gitignore Generator
Combine .gitignore templates and download.
Git Cheat Sheet
Searchable Git commands with explanations.
URL Parser
Split URLs, edit query params, build UTM links.
Frequently asked questions
Is my data sent to a server?
Most developer tools run fully in your browser. The web scraper and header checker fetch the public URL you enter through our server, because browsers block reading other sites directly; nothing is stored.
Do the tools work offline?
The formatters, encoders and converters keep working offline after the first visit if you install HQ8T as an app. Network tools need internet.
How does file sharing work without uploading?
Local File Share finds nearby devices on your Wi-Fi and connects the two browsers directly with WebRTC. Only short connection messages pass through our server; the files go straight from one device to the other.
Are there limits?
Formatters handle large inputs limited only by your device. The scraper reads pages up to 5 MB and respects each site's robots.txt.