Every developer has a set of go-to tools they reach for dozens of times a week. JSON formatters, regex testers, password generators. The problem is most of these tools are spread across 15 different bookmarks, several require accounts, and some send your data to a remote server.
Here's a curated list of the free browser-based tools we built at WeHelpDevs — all running entirely client-side, meaning your data never leaves your browser.
Formatting Tools
JSON Formatter
When you get an API response or pull data from a database, it's usually minified — one long line of text impossible to read. A JSON formatter adds indentation and line breaks, highlights syntax, and catches errors like trailing commas or unquoted keys.
When to use it: Debugging API responses, reviewing config files, validating JSON before committing it.
XML Formatter
Despite JSON's popularity, XML is still everywhere — SOAP APIs, RSS feeds, Android resources, Maven configs. An XML formatter makes nested XML structures readable and catches unclosed tags.
SQL Formatter
Raw SQL queries pasted from logs or generated by ORMs are notoriously unreadable. A SQL formatter adds indentation aligned to keywords (SELECT, FROM, WHERE, JOIN), making it easy to trace what a query actually does.
→ SQL Formatter — supports MySQL, PostgreSQL, SQLite, T-SQL, BigQuery
CSS Minifier
Before shipping CSS to production, minification removes comments, collapses whitespace, and shortens hex colors — typically reducing file size by 20–40%.
Encoding and Decoding
Base64 Encoder/Decoder
Base64 encodes binary data as ASCII text. Used in JWT tokens, email attachments, embedding images in CSS, and HTTP Basic Auth headers. You'll encounter it constantly in web development.
URL Encoder/Decoder
URLs can only contain certain characters. Spaces, ampersands, and non-ASCII characters must be percent-encoded. This tool converts both ways — useful when debugging query strings or constructing API requests.
JWT Decoder
JSON Web Tokens look like random strings (eyJh...) but contain a header, payload, and signature. Decoding the payload reveals the claims — user ID, roles, expiry time — without needing to verify the signature.
Security note: Never paste production JWTs containing sensitive data into third-party websites. Our JWT decoder runs entirely in your browser — the token is never sent to a server.
Generators
Password Generator
Cryptographically secure random passwords generated using the WebCrypto API — the same API browsers use for HTTPS. You can control length, character sets, and copy the result instantly.
UUID Generator
UUIDs are the standard way to generate unique IDs without a central authority — database primary keys, file names, session tokens. This tool generates RFC 4122 v4 UUIDs in bulk.
QR Code Generator
Generate QR codes from any text, URL, or data string. Useful for sharing links, contact info, or WiFi credentials. Download as PNG with a single click.
Developer Utilities
Regex Tester
Write a regular expression and see matches highlighted in real-time as you type. Shows match groups, supports all JavaScript regex flags, and explains what matched and what didn't.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes of any input string. Used for checksums, content fingerprinting, and verifying file integrity.
Cron Expression Builder
Cron syntax is notoriously confusing. This builder lets you pick a schedule with dropdowns and shows you the resulting cron expression plus a human-readable description ("Every Monday at 9:00 AM").
IP Address Lookup
Look up geolocation, ISP, timezone, and hostname for any IP address. Click "My IP" to see your own. Powered by the ipinfo.io API.
Text and Document Tools
Word Counter
Counts words, characters, sentences, and paragraphs. Shows average reading time. Useful for content that has limits (tweets, meta descriptions, article minimums).
HTML to Markdown Converter
Paste HTML from a CMS, email, or web page and get clean Markdown back. Useful when migrating content between systems or writing documentation.
Color Converter
Convert between HEX, RGB, HSL, and HSB color formats. Copy the result in any format with one click.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Shows the time in UTC and your local timezone simultaneously — essential when debugging logs.
Why Browser-Based Tools?
The developer tool market is full of SaaS products that require email signups, rate-limit free users, and send your data to their servers. For formatting a JSON blob or generating a UUID, that's overkill — and a security risk when the data is sensitive.
Browser-based tools run entirely on your device:
- No account required — open and use immediately
- No data transmitted — your API keys, tokens, and proprietary data stay local
- No rate limits — run as many operations as you want
- Works offline — once the page is loaded, no internet connection needed
All 29+ tools on WeHelpDevs follow this model. Your data is yours.